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Install Zabbix Proxy configure and connect to Zabbix server on CentOS Linux

Thursday, May 4th, 2023

Install Zabbix Proxy configure and connect to Zabbix server on CentOS Linux

1. Why use Zabbix-Proxy hidden advantages of using Zabbix-Proxy ?

Proxy can be used for many purposes and can provide many hidden benefits, just to name few of them:

Offload Zabbix Server when monitoring thousands of devices
Monitor remote locations
Monitor locations having unreliable communications
Simplify maintenance of distributed monitoring
Improved Security (Zabbix server can be restricted to be connectable only by the set of connected Zabbix Proxy / Proxies

advantages-of-using-zabbix-proxy-instead-of-direct-connect-monitored-hosts-to-zabbix-server-diagram

A Zabbix proxy is the ideal solution if you have numerous hosts with multiple slow items that are affecting the performance of the server simply because processes are spending most of the time simply waiting for a response. A proxy can collect information from all hosts using its internal processes and then send raw historical data to the server. The time needed to connect and receive the host response will be on the proxy site, and the server performance will not be affected at all. A proxy just sends raw values to the server, and the server itself does not have to connect to the host to get the data.

2. Install zabbix-proxy-sqlite3 rpm package from Zabbix Official Repositories download page

Zabbix repository provides choice of 3 packages named as follows:

zabbix-proxy-mysql
zabbix-proxy-pgsql
zabbix-proxy-sqlite3

where the last value of the name (after zabbix-proxy) represents database type of the package — MySQL, PostgreSQL and SQLite respectively.

To not bother installing MySQL / PostgreSQL separate database servers, a lightweight choice is to use the sqlite3 db version.
As I prefer zabbix-proxy data to be stored inside a flat database, thus I choose to use zabbix-proxy-sqlite3.

[root@sysadminshelp:/root ]# yum info zabbix-proxy-sqlite3-5.0.31-1.el7.x86_64
Заредени плъгини: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.netix.net
* epel: fedora.ipacct.com
* extras: mirrors.netix.net
* remi: remi.mirror.karneval.cz
* remi-php74: remi.mirror.karneval.cz
* remi-safe: remi.mirror.karneval.cz
* updates: mirrors.netix.net
Инсталирани пакети
Име : zabbix-proxy-sqlite3
Архитект. : x86_64
Версия : 5.0.31
Издание : 1.el7
Обем : 4.4 M
Хранилище : installed
Обобщение : Zabbix proxy for SQLite3 database
URL : http://www.zabbix.com/
Лиценз : GPLv2+
Описание : Zabbix proxy with SQLite3 database support.

My experience to try to install thethe default CentOS RPM package for zabbix-proxy-sqlite3 provided by default
RPM package that came with CentOS did not work as expected and trying to install / configure and use it via

[root@sysadminshelp:/root ]# yum install zabbix-proxy-sqlite3.x86_64 -y

[root@sysadminshelp:/root ]# vi /etc/zabbix/zabbix_proxy.conf

Led me to a nasty errors seen in /var/log/zabbixsrv/zabbix_proxy.log like:

May 1st 2023, 08:42:45.020 zabbix_server cannot set list of PSK ciphersuites: file ssl_lib.c line 1314: error:1410D0B9:SSL routines:SSL_CTX_set_cipher_list:no cipher match
May 1st 2023, 08:42:45.018 zabbix_server cannot set list of PSK ciphersuites: file ssl_lib.c line 1314: error:1410D0B9:SSL routines:SSL_CTX_set_cipher_list:no cipher match
May 1st 2023, 08:42:45.013 zabbix_server cannot set list of PSK ciphersuites: file ssl_lib.c line 1314: error:1410D0B9:SSL routines:SSL_CTX_set_cipher_list:no cipher match
May 1st 2023, 08:42:45.013 zabbix_server cannot set list of PSK ciphersuites: file ssl_lib.c line 1314: error:1410D0B9:SSL routines:SSL_CTX_set_cipher_list:no cipher match
May 1st 2023, 08:42:45.011 zabbix_server cannot set list of PSK ciphersuites: file ssl_lib.c line 1314: error:1410D0B9:SSL routines:SSL_CTX_set_cipher_list:no cipher match

After some googling and reading some threads came upon this one https://support.zabbix.com/browse/ZBXNEXT-3604, there is exmplaed errors preventing the configured zabbix-proxy
to start are caused by the zabbix-proxy-sqlite3 package provided by Redhat (due to openssl incompitability bug or something ).

As one of people in the discussion pointed out the quickest workaround suggested is simply to use the official Zabbix Repository packages for zabbix-proxy-sqlite3, in order to not waste anymore time on this
trivial stuff to install it, simply run:

[root@sysadminshelp:/root ]# rpm -Uvh \
https://repo.zabbix.com/zabbix/5.0/rhel/7/x86_64/zabbix-proxy-sqlite3-5.0.31-1.el7.x86_64.rpm

Alternative way if you seem to not have the machine connected to the internet is simply download the package with wget / lynx / curl / w3m from another machine
that can reach the Internet upload the package via the local LAN or VPN and install it:

# wget https://repo.zabbix.com/zabbix/5.0/rhel/7/x86_64/zabbix-proxy-sqlite3-5.0.31-1.el7.x86_64.rpm …

[root@sysadminshelp:/root ]# rpm -ivh zabbix-proxy-sqlite3-5.0.31-1.el7.x86_64.rpm

NOTE ! Before you install proxy, keep in mind that your proxy version must match the Zabbix server version !

3. Generate a PSK random secret key and set proper permissions for zabbix-proxy directories

[root@sysadminshelp:/root ]# cd /etc/zabbix/

[root@sysadminshelp:/root ]# openssl rand -hex 32 >> /etc/zabbix/zabbix_proxy.psk
[root@sysadminshelp:/root ]# chown root:zabbix zabbix_proxy.psk [root@sysadminshelp:/root ]# vi /etc/zabbix/zabbix_proxy.conf [root@sysadminshelp:/root ]# mkdir -p /var/lib/zabbix-proxy/sqlite3db
[root@sysadminshelp:/root ]# chown -R zabbix:zabbix /var/lib/zabbix-proxy
[root@sysadminshelp:/var/lib/zabbixsrv/sqlite3db]# sqlite3 zabbix_proxy
SQLite version 3.7.17 2013-05-20 00:56:22
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> .databases
seq name file
— ————— ———————————————————-
0 main /var/lib/zabbixsrv/sqlite3db/zabbix_proxy
sqlite> [root@sysadminshelp:/root ]# vi /etc/zabbix_proxy.conf
#DBName=zabbix_proxy
DBName=/var/lib/zabbixsrv/sqlite3db/zabbix_proxy

4. Configure zabbix proxy to be able to connect to Zabbix Server

[root@sysadminshelp:/root ]# vi /etc/zabbix/zabbix_proxy.conf    ############ GENERAL PARAMETERS #################
   ProxyMode=0
   Server=192.168.1.28
   ServerPort=10051
   Hostname=zabbix-proxy
   ListenPort=10051
   SourceIP=10.168.1.55
   LogFile=/var/log/zabbix/zabbix_proxy.log
   LogFileSize=1
   DebugLevel=2
   PidFile=/var/run/zabbix/zabbix_proxy.pid
   DBName=/var/lib/zabbix-proxy/sqlite3db/zabbix_proxy.db
   DBUser=zabbix

   ######### PROXY SPECIFIC PARAMETERS #############
   ProxyOfflineBuffer=24
   HeartbeatFrequency=60
   ConfigFrequency=120

   ############ ADVANCED PARAMETERS ################
   StartPollersUnreachable=3
   StartHTTPPollers=3
   JavaGateway=127.0.0.1
   JavaGatewayPort=10052
   StartJavaPollers=5
   SNMPTrapperFile=/var/log/snmptrap/snmptrap.log
   StartSNMPTrapper=1
   CacheSize=32M
   Timeout=4
   ExternalScripts=/usr/lib/zabbix/externalscripts
   LogSlowQueries=3000

   ####### TLS-RELATED PARAMETERS #######
   TLSConnect=psk
   TLSAccept=psk
   TLSPSKIdentity=PSK zabbix-proxy-fqdn-hostname
   TLSPSKFile=/etc/zabbix/zabbix_proxy.psk

5. Check and make sure the installed zabbix proxy as well as the zabbix_proxy server zabbix_agentd client and zabbix_server are at the same major version release

a) Check zabbix proxy version

[root@sysadminshelp:/etc/zabbix]# zabbix_proxy -V
zabbix_proxy (Zabbix) 5.0.31
Revision f64a07aefca 30 January 2023, compilation time: Jan 30 2023 09:55:10

Copyright (C) 2023 Zabbix SIA
License GPLv2+: GNU GPL version 2 or later <https://www.gnu.org/licenses/>.
This is free software: you are free to change and redistribute it according to
the license. There is NO WARRANTY, to the extent permitted by law.

This product includes software developed by the OpenSSL Project
for use in the OpenSSL Toolkit (http://www.openssl.org/).

Compiled with OpenSSL 1.0.1e-fips 11 Feb 2013
Running with OpenSSL 1.0.1e-fips 11 Feb 2013
[root@sysadminshelp:/etc/zabbix]#

b) check zabbix_agentd version

[root@sysadminshelp:/etc/zabbix]# zabbix_agentd -V
zabbix_agentd (daemon) (Zabbix) 5.0.30
Revision 2c96c38fb4b 28 November 2022, compilation time: Nov 28 2022 11:27:43

Copyright (C) 2022 Zabbix SIA
License GPLv2+: GNU GPL version 2 or later <https://www.gnu.org/licenses/>.
This is free software: you are free to change and redistribute it according to
the license. There is NO WARRANTY, to the extent permitted by law.

This product includes software developed by the OpenSSL Project
for use in the OpenSSL Toolkit (http://www.openssl.org/).

Compiled with OpenSSL 1.0.1e-fips 11 Feb 2013
Running with OpenSSL 1.0.1e-fips 11 Feb 2013

c) Check zabbix server version

[root@zabbix:~]# zabbix_server -V
zabbix_server (Zabbix) 5.0.30
Revision 2c96c38fb4b 28 November 2022, compilation time: Nov 28 2022 09:19:03

Copyright (C) 2022 Zabbix SIA
License GPLv2+: GNU GPL version 2 or later <https://www.gnu.org/licenses/>.
This is free software: you are free to change and redistribute it according to
the license. There is NO WARRANTY, to the extent permitted by law.

This product includes software developed by the OpenSSL Project
for use in the OpenSSL Toolkit (http://www.openssl.org/).

Compiled with OpenSSL 1.1.1d 10 Sep 2019
Running with OpenSSL 1.1.1n 15 Mar 2022

6. Starting the zabbix-proxy for a first time

Before beginning with installation make sure selinux is disabled, as it might cause some issues with Zabbix

[root@sysadminshelp:/etc/zabbix]# sestatus
SELinux status: disabled

If you need to have the selinux enabled you will have to allow the zabbix-proxy into selinux as well:

# cd /tmp
# grep zabbix_proxy /var/log/audit/audit.log | grep denied | audit2allow -m zabbix_proxy > zabbix_proxy.te
# grep zabbix_proxy /var/log/audit/audit.log | grep denied | audit2allow -M zabbix_proxy
# semodule -i zabbix_proxy.pp

[root@sysadminshelp:/etc/zabbix]# systemctl start zabbix-proxy

Also lets enable zabbix-proxy to automatically start it on next server reboot / boot.

root@sysadminshelp:/etc/zabbix]# systemctl enable zabbix-proxy

Normally running zabbix-proxy should provide a status messages like:

[root@sysadminshelp:/etc/zabbix]# systemctl status zabbix-proxy
● zabbix-proxy.service – Zabbix Proxy
Loaded: loaded (/usr/lib/systemd/system/zabbix-proxy.service; disabled; vendor preset: disabled)
Active: active (running) since чт 2023-05-04 14:58:36 CEST; 2h 59min ago
Process: 8500 ExecStop=/bin/kill -SIGTERM $MAINPID (code=exited, status=0/SUCCESS)
Process: 8504 ExecStart=/usr/sbin/zabbix_proxy -c $CONFFILE (code=exited, status=0/SUCCESS)
Main PID: 8506 (zabbix_proxy)
CGroup: /system.slice/zabbix-proxy.service
├─8506 /usr/sbin/zabbix_proxy -c /etc/zabbix/zabbix_proxy.conf
├─8507 /usr/sbin/zabbix_proxy: configuration syncer [synced config 40521 bytes in 0.0…
├─8508 /usr/sbin/zabbix_proxy: trapper #1 [processed data in 0.000808 sec, waiting fo…
├─8509 /usr/sbin/zabbix_proxy: trapper #2 [processed data in 0.005028 sec, waiting fo…
├─8510 /usr/sbin/zabbix_proxy: trapper #3 [processed data in 0.001240 sec, waiting fo…
├─8511 /usr/sbin/zabbix_proxy: trapper #4 [processed data in 0.004378 sec, waiting fo…
├─8512 /usr/sbin/zabbix_proxy: trapper #5 [processed data in 0.004991 sec, waiting fo…
├─8513 /usr/sbin/zabbix_proxy: preprocessing manager #1 [queued 0, processed 3 values…
├─8514 /usr/sbin/zabbix_proxy: preprocessing worker #1 started
├─8515 /usr/sbin/zabbix_proxy: preprocessing worker #2 started
├─8516 /usr/sbin/zabbix_proxy: preprocessing worker #3 started
├─8517 /usr/sbin/zabbix_proxy: heartbeat sender [sending heartbeat message success in…
├─8518 /usr/sbin/zabbix_proxy: data sender [sent 0 values in 0.005241 sec, idle 1 sec…
├─8519 /usr/sbin/zabbix_proxy: housekeeper [deleted 4501 records in 0.011462 sec, idl…
├─8520 /usr/sbin/zabbix_proxy: http poller #1 [got 0 values in 0.000248 sec, idle 5 s…
├─8521 /usr/sbin/zabbix_proxy: http poller #2 [got 0 values in 0.000239 sec, idle 5 s…
├─8522 /usr/sbin/zabbix_proxy: http poller #3 [got 0 values in 0.000328 sec, idle 5 s…
├─8523 /usr/sbin/zabbix_proxy: discoverer #1 [processed 0 rules in 0.000261 sec, idle…
├─8524 /usr/sbin/zabbix_proxy: history syncer #1 [processed 0 values in 0.000009 sec,…
├─8525 /usr/sbin/zabbix_proxy: history syncer #2 [processed 0 values in 0.000007 sec,…
├─8526 /usr/sbin/zabbix_proxy: history syncer #3 [processed 0 values in 0.000014 sec,…
├─8527 /usr/sbin/zabbix_proxy: history syncer #4 [processed 0 values in 0.000021 sec,…
├─8528 /usr/sbin/zabbix_proxy: java poller #1 [got 0 values in 0.000017 sec, idle 5 s…
├─8529 /usr/sbin/zabbix_proxy: java poller #2 [got 0 values in 0.000019 sec, idle 5 s…
├─8530 /usr/sbin/zabbix_proxy: java poller #3 [got 0 values in 0.000019 sec, idle 5 s…
├─8531 /usr/sbin/zabbix_proxy: java poller #4 [got 0 values in 0.000018 sec, idle 5 s…
├─8532 /usr/sbin/zabbix_proxy: java poller #5 [got 0 values in 0.000013 sec, idle 5 s…
├─8533 /usr/sbin/zabbix_proxy: snmp trapper [processed data in 0.000026 sec, idle 1 s…
├─8534 /usr/sbin/zabbix_proxy: self-monitoring [processed data in 0.000034 sec, idle …
├─8535 /usr/sbin/zabbix_proxy: task manager [processed 0 task(s) in 0.000169 sec, idl…
├─8536 /usr/sbin/zabbix_proxy: poller #1 [got 0 values in 0.000012 sec, idle 5 sec]
├─8537 /usr/sbin/zabbix_proxy: poller #2 [got 0 values in 0.000021 sec, idle 5 sec]
├─8538 /usr/sbin/zabbix_proxy: poller #3 [got 0 values in 0.000039 sec, idle 5 sec]
├─8539 /usr/sbin/zabbix_proxy: poller #4 [got 0 values in 0.000024 sec, idle 5 sec]
├─8540 /usr/sbin/zabbix_proxy: poller #5 [got 0 values in 0.000019 sec, idle 5 sec]
├─8541 /usr/sbin/zabbix_proxy: unreachable poller #1 [got 0 values in 0.000011 sec, i…
├─8542 /usr/sbin/zabbix_proxy: unreachable poller #2 [got 0 values in 0.000018 sec, i…
├─8543 /usr/sbin/zabbix_proxy: unreachable poller #3 [got 0 values in 0.000041 sec, i…
└─8544 /usr/sbin/zabbix_proxy: icmp pinger #1 [got 0 values in 0.000022 sec, idle 5 s…

май 04 14:58:36 sysadminshelp systemd[1]: Stopped Zabbix Proxy.
май 04 14:58:36 sysadminshelp systemd[1]: Starting Zabbix Proxy…
май 04 14:58:36 sysadminshelp systemd[1]: Started Zabbix Proxy.

zabbix-server-zabbix-proxy-and-zabbix-clients-overview-diagram

7. Configure zabbix-agentd to use your just new brand new zabbix-proxy

Here is my sample configuration file:

[root@sysadminshelp:/etc/zabbix]# grep -v \# /etc/zabbix/zabbix_agentd.conf | sed '/^$/d'
PidFile=/var/run/zabbix/zabbix_agentd.pid
LogFile=/var/log/zabbix/zabbix_agentd.log
LogFileSize=0
Server=zabbix-proxy
ServerActive=zabbix-proxy:10051
ListenIP
Hostname=sysadminshelp
BufferSend=30
BufferSize=100
Include=/etc/zabbix/zabbix_agentd.d/*.conf

Note that the ServerActive given "zabbix-proxy" should be resolvable from the host, or even better you might want to put the IP of the Proxy if
you don't have at least a pseudo Hostname already configured inside /etc/hosts or actual DNS 'A' Active record configured inside a properly resolving
DNS server configured on the host via /etc/resolv.conf.

8. Create and Configure new proxy into the Zabbix-server host

Go to the zabbix server web interface URL into menus:

zabbix-administration-proxy-config

Administration -> Proxies (Proxy)

Click on ;

Create Proxy button (uppper right corner)

*Proxy name: usually-your-host-pingable-fqdn
Proxy mode: Active
Proxy address: 192.168.1.50
Description: pcfreak zabbix proxy

Administration -> Proxies -> Encryption

From "Connection to proxy"

Untick "No encryption"

and

Tick "PSK"

zabbix-administration-proxy-config-encryption

*PSK Identity: PSK proxy
*PSK: Put the key here (copy from /etc/zabbix/zabbix_proxy.psk generated steps earlier with openssl)

[root@sysadminshelp:/etc/zabbix]# cat zabbix_proxy.psk
faddbd96be00ac42c892fda5201634df25d51f3ndbbbf6cee9d354b2817092a28

Press the "Update" Button

zabbix-administration-proxy-config-encryption1

and go again to Proxies and check the zabbix-proxy is connected to the server and hosts configured to use the zabbix proxy reporting frequently.

To make sure that the configured new hosts to use the Zabbix Proxy instead of direct connection to Zabbix Server, go to Latest Data and check whether the configured Hostnames to connect to the Zabbix-Proxy continues to sent Data still.

9. Debugging problems with zabix-proxy and zabbix-agentd connectivity to proxy

In case of troubles check out what is going on inside the Zabbix Proxy / Agent and Server log files

[root@sysadminshelp:/etc/zabbix]# tail -n 50 /var/log/zabbix/zabbix_proxy.log

6832:20230504:134032.281 Starting Zabbix Proxy (active) [zabbix-proxy]. Zabbix 5.0.31 (revision f
64a07aefca).
6832:20230504:134032.281 **** Enabled features ****
6832:20230504:134032.281 SNMP monitoring: YES
6832:20230504:134032.281 IPMI monitoring: YES
6832:20230504:134032.281 Web monitoring: YES
6832:20230504:134032.281 VMware monitoring: YES
6832:20230504:134032.281 ODBC: YES
6832:20230504:134032.281 SSH support: YES
6832:20230504:134032.281 IPv6 support: YES
6832:20230504:134032.281 TLS support: YES
6832:20230504:134032.281 **************************
6832:20230504:134032.281 using configuration file: /etc/zabbix/zabbix_proxy.conf
6832:20230504:134032.291 current database version (mandatory/optional): 05000000/05000005
6832:20230504:134032.291 required mandatory version: 05000000
6832:20230504:134032.292 proxy #0 started [main process]
6833:20230504:134032.292 proxy #1 started [configuration syncer #1]
6833:20230504:134032.329 received configuration data from server at "192.168.1.28", datalen 40521
6834:20230504:134032.392 proxy #2 started [trapper #1]
6835:20230504:134032.401 proxy #3 started [trapper #2]
6836:20230504:134032.402 proxy #4 started [trapper #3]
6838:20230504:134032.405 proxy #6 started [trapper #5]
6837:20230504:134032.409 proxy #5 started [trapper #4]
6843:20230504:134032.409 proxy #11 started [heartbeat sender #1]
6845:20230504:134032.412 proxy #13 started [housekeeper #1]
6847:20230504:134032.412 proxy #15 started [discoverer #1]
8526:20230504:145836.512 proxy #20 started [history syncer #3]
8517:20230504:145836.512 proxy #11 started [heartbeat sender #1]
8530:20230504:145836.515 proxy #24 started [java poller #3]
8531:20230504:145836.517 proxy #25 started [java poller #4]
8532:20230504:145836.520 proxy #26 started [java poller #5]
8536:20230504:145836.522 proxy #30 started [poller #1]
8527:20230504:145836.525 proxy #21 started [history syncer #4]
8535:20230504:145836.525 proxy #29 started [task manager #1]
8533:20230504:145836.528 proxy #27 started [snmp trapper #1]
8539:20230504:145836.528 proxy #33 started [poller #4]
8538:20230504:145836.529 proxy #32 started [poller #3]
8534:20230504:145836.532 proxy #28 started [self-monitoring #1]
8544:20230504:145836.532 proxy #38 started [icmp pinger #1]
8543:20230504:145836.532 proxy #37 started [unreachable poller #3]
8542:20230504:145836.535 proxy #36 started [unreachable poller #2]
8541:20230504:145836.537 proxy #35 started [unreachable poller #1]
8540:20230504:145836.540 proxy #34 started [poller #5]
8507:20230504:150036.453 received configuration data from server at "192.168.1.28", datalen 40521
8507:20230504:150236.503 received configuration data from server at "192.168.1.28", datalen 40521
8507:20230504:150436.556 received configuration data from server at "192.168.1.28", datalen 40521
8507:20230504:150636.608 received configuration data from server at "192.168.1.28", datalen 40521
8507:20230504:150836.662 received configuration data from server at "192.168.1.28", datalen 40521
…

[root@sysadminshelp:/etc/zabbix]# tail -n 10 /var/log/zabbix-agent/zabbix_agentd.log
3096166:20230504:182840.461 agent #1 started [collector]
3096167:20230504:182840.462 agent #2 started [listener #1]
3096168:20230504:182840.463 agent #3 started [listener #2]
3096169:20230504:182840.464 agent #4 started [listener #3]
3096170:20230504:182840.464 agent #5 started [active checks #1]

If necessery to Debug further and track some strange errors, you might want to increase the DebugLevel to lets say DebugLevel=5

5 – extended debugging (produces even more information)

If checking both zabbix_agentd.log and zabbix_proxy.log cannot give you enough of a hint on what might be the issues you face with your userparameter scripts or missing Monitored data etc. and hopefully you have access to the zabbix-server machine, check out the zabbix server log as well

[root@zabbix:~]# tail -n 100 /var/log/zabbix/zabbix_server.log

3145027:20230504:182641.556 sending configuration data to proxy "zabbix-proxy" at "192.168.1.50", datalen 40521, bytes 6120 with compression ratio 6.6
3145029:20230504:182716.529 cannot send list of active checks to "192.168.1.30": host [pcfrxenweb] not found
3145028:20230504:182731.959 cannot send list of active checks to "192.168.1.30": host [pcfrxenweb] not found
3145029:20230504:182756.634 cannot send list of active checks to "192.168.1.30": host [pcfrxenweb] not found

Wrapping it up

In this article, we have learned how to install and configure a zabbix-proxy server and prepare a PSK encryption secret key for it.
We learned also how to connect this server to the central zabbix monitoring host machine in Active mode, so both Zabbix proxy and server can communicate in a secure crypted form,
as well as how to set zabbix_agentd clients to connect to the zabbix proxy
which will from itself send its data to the Central Zabbix server host as well as how to Debug and hopefully solve issues with communication between Zabbix client -> Zabbix Proxy -> Zabbix server.

I know this article, does not say anything revolutionary and there is plenty of posts online talking about how to run yourself a zabbix proxy and make in your home or corporate network,
but I thought to write it down as by writting it and reading a bit more on the topic of Zabbix Server / Proxy / Agent, that give myself a better overview on how this technologies work and such an article will give myself an easier step by step guide to follow,
in future when I have to configure Zabbix Environments for personal hobby or professionally for customers.
Hope you enjoyed. Cheers ! 🙂

Tags: cause, Click, configured, curl, download, file, history, Hope, howto, incompitability, Install Zabbix Proxy, lib, log, match, menus, messages, network, page, pcfreak, Press, psk, rpm, server version, task, unreachable, YES, zabbix-proxy
Posted in Linux, System Administration, Zabbix | No Comments »

Restart hung Mac OS application – How to kill programs in Mac OS – alternative of Windows CTRL + ALT + DEL

Friday, May 23rd, 2014

If you happen to have the rare case of having a hung MAC OS X application and you're coming from a Linux / Windows background you will be certainly wonderhing how to kill Mac OS X hung application.
In Mac OS the 3 golden buttons to kill crashed application are:

COMMAND + OPTION + ESCAPE

Command + Option + Escape

while pressed simultaneously is the Mac Computer equivalent of Windows CTRL + ALT + DEL

Holding together COMMAND + OPTION + ESCAPE on MAC OS brings up the Force Quit Window showing and letting you choose between the list of open applications. To close freezed MAC application, choose it and Press the Force Quit Button this will kill immediately that application.

To directly end application without invoking the choose Force Quit Window menu, to force a hanging app quit right click on its icon in Dock (CTRL + Click) and choose "Force Quit” from context menu.

A little bit more on why applications hung in MAC OS. Each application in MAC OS has its event queue. Event queue is created on initial application launch, event queue is buffer that accepts input from system (could be user input from kbd or mouse, messages passed from other programs etc.). Program is hanging when system detects queued events are not being used.

Other reasons for Mac OS hanging program is whether you're attaching detaching new hardware peripherals (i.e. problems caused by improper mount / unmounts), same hang issues are often observed on BSD and Linux. Sometimes just re-connecting (mouse, external hdd etc.) resolves it.
Program hungs due to buggy software are much rarer in Macs just like in IPhones and Ipads due to fact mac applications are very well tested until published in appstore.

Issues with program hungs in Mac sometimes happen after "sleep mode" during "system wake" function – closing, opening macbook. If a crashed program is of critical importance and you don't want to "Force Quit" with COMMAND + OPTION + ESC. Try send PC to sleep mode for a minute or 2 by pressing together OPTION + COMMAND + EJECT.

An alternative approach to solve hanging app issue is to Force-quit Finder and Dock to try that, launch Terminal

And type there:

# killall Dock

Other useful to know Mac OS keyboard combination is COMMAND + OPTION + POWER – Hold together Command and Option and after a while press Power – This is a shortcut to instruct your Mac PC to reboot.

Tags: application, BSD, case, close, event, external hdd, Force Quit, Force Quit Window, kill, Linux, linux windows, MAC, Mac Computer, new hardware, Press, program, queue, rare case, Restart, sleep, system
Posted in Curious Facts, Everyday Life, Mac OS X, System Administration, Various | 1 Comment »

Restoring sudden disappeared (deleted) Android Phone Contacts and Data on ZTE, Samsung, LG and Huawei mobile phones

Tuesday, May 20th, 2014

dr-fone-recover-android-and-iphone-broken-accidently-lost-disappeared-contacts-and-lost-data.

For 5th time since I both my ZTE – Blade III Smartphone – Android OS powered mobile, my Phone Contacts disappear. This is pretty annoying and I'm more and more convinced Android is not yet really ready for the masses..

I've enabled on Phone Sync my contacts with Google but even though I can see all my mobile phones visible via – http://gmail.com/contacts/, my attempts to use Android's:

Settings -> Account & Sync -> Gmail -> (Sync Contacts and Sync people details

– to synchronize Gmail Phone and E-mail Contacts to Phone from Gmail did not produced a positive result.

To Solve the situation earlier I've used on multiple times Contacts Sync Fix – Tool to help fix some (not all) of the causes of "Sync is currently experiencing problems. It will be back shortly." message from Google contacts sync. However this time Contacts Sync Fix tool did not revert back my missing Phone Contacts.

I googled to see what kind of Phone Contacts recovery software is there and stumbled on Wondershare Dr. Fone – World’s 1st Andorid, iPhone, iPad and iPod touch data recovery software for personal users. Here is what Dr. Fone does:

Recover data from Andorid and iOS devices, iCloud backup and iTunes backup (including encrypted one).
Available to recover messages, contacts, photos, videos, notes, call history, calendars, voicemail, voice memos, reminders, bookmarks and other documents.
Recover App data like WhatsApp, Instagram, Flickr, iPhoto, iMovie, Kindle, etc.
Compatible with the latest iOS 7 and supports iPhone 5S/5C/5/4S/4/3GS, all iPads and iPod touch 5/4.
Regain lost data due to deletion, device crashed or broken, OS bugs, device loss, jailbreak, iOS upgrade and factory.

Dr. Fone is proprietary software and quite expensive costs a lot 50$ bucks! But Cracked versions are circulating the net on many torrents, there is a cracked version of Dr. Fone on http://ThePiratebay.se
Dr. Fone is very easy to use, to recover my lost Android Phones data, I had to:

1. Connect my ZTE through USB cable to a Windows PC (where I have installed Dr. Fone
2. Scan the device for my lost data, through the program GUI interface (This make a lot of data be seen including all my Videos, Pictures, Contacts etc.)
3. Press the recover data button and choose a destination folder where found files to recover will be stored.

A Note to make here is, Dr.Fone requieres that USB Debugging has to be Switched on from the Phone (on Android version 3.0 to 4.1) – "Settings" -> Click "Developer options" -> Check "USB debugging".
On Android 4.2 and newer to activate USB Debugging – "Settings -> About Phone -> Developer Options -> (Check) USB Debugging"

Found Phone Contacts, are exported into .CSV file, HTML and VCard. So to import back my recovered contacts from my Mobile, I transferred VCard file extension (VCard.VCF) into my Mobile Phone via attached USB cable and from Phone's File Manager clicked on VCard.vcf to import my contacts.

So far so good, I had all my Phone Contacts recovered and again accessible from Android's PhoneBook app, however because of import for some reasons I had many of contacts Imported and visible now multiple times, as well as a lot of junk contacts like just Phone Numbers without names. To resolve that I first thought of manually reviewing and deleting only junk and duplicate addressbook contacts. As I didn't know how to select and delete multiple Phone Contacts? – using the phone default Phone Contacts app, I googled and found the Contact Remover app – a tiny program listing all your contacts letting you choose only those who would like to delete.

android-contact-remover-application-to-delete-multpile-contacts

Though this program was working, Contact selection was lagging and was really irritating, so I googled further to see if there is no Application to delete duplicate phone contacts in Android, finding – Duplicate Contacts – Simple tool to see and delete duplicate contacts.

delete-duplicate-contacts-phones-in-android

Once deleting the duplicate Phones (I had most of the phones occuring 5 times and there were number of email addresses wrongly parsed and imported into Contacts. I just had to delete a number of junky names but happily all my Phone Contacts were succesfully recovered! 🙂
Now because I already had a Contacts set to Sync with Google, once the Junky multiple duplicate contacts were stored on the Phone they started synchronizing with Google Contacts.
Google-Contacts-find-and-merge-delete-duplicate-contacts-and-phones

After synchronization was completed to clean my Google Account stored Phone number names and Contacts – since some time Google introduced a special functionality for that – Find and Merge Duplicates.
For future to Keep my contacts in Ordered and backupped to prevent such a complex future exercises, I was recommended MyPhoneExplorer by a colleague. MyPhoneExplorer supports backup (Export and Import) your Phone Contacts via USB, Bluetooth or even WI-FI on multiple devices, starting from Android Tablets, Android Mobile Phones and even old Nokia Symbian or other archaic Alcatel, LG etc. OS-ed mobile phones.

myphone-explorers-keep-regular-backups-of-your-mobile-phone-contacts

Tags: Android Phones, attempts, Contacts Sync Fix, cracked version, CSV, data, destination, Found Phone Contacts, Google Account, HTML, Huawei, import, LG, lot, multiple, multiple times, OS, phone, Phone Contacts, Press, proprietary software, recovery, revert, software, succesfully, tiny program, USB, ZTE
Posted in Everyday Life, Mobile Phone Apps & Games, Various | 5 Comments »

How to make GNOME 3 Desktop icons to work as in GNOME 2 on Debian GNU / Linux

Saturday, February 4th, 2012

If you're using Debian GNU/Linux wheezy/sid, you have already figured out GNOME3 settings to start GNOME in Classic mode (like in GNOME 2), starts gnome in a mode where the desktop is not showing the usual Computer, Home, Trash etc.

Besides that in that strange back-compitability Classic GNOME mode its impossible to add any program as a link in desktop like in the good old GNOME 2.

Thanksfully this abusive behaviour of the backwards compitability mode is easily fixable by two simple steps, here they are:

1. Install gnome-tweak-tool – (Tool to adjust advanced configuration settings for GNOME

root@debian:~# apt-get install gnome-tweak-tool

2. Start gnome-tweak tool

Press ALT+F2 and run gnome-tweak-tool or run it via xterm / gnome-terminal:

moonman@Moon:~$ gnome-tweak-tool

Change in Desktop, Have file manager handle the desktop the settings to ON

gnome-tweek-tool Debian GNU Linux wheezy sid screenshot

gnome-tweak-tool Debian wheezy/Sid GNU Linux screenshot handle desktop on

Once the Screenshot Handle Desktop is set to ON, further drag and dropping any application to the Desktop will be working.
Something really irritating is that launching applications in GNOME 3 does not work properly if you just press ALT+F2 and type in lets say gnome-terminal , to work around this weirdity you will have to install gnome-shell package.

Tags: Auto, behaviour, classic mode, compitability, configuration settings, debian gnu, desktop icons, Draft, f2, Gnome, gnu linux, Handle, Install, link, Linux, manager, Mode, moon, moonman, package, Press, root, shell package, sid, simple steps, something, Start, Thanksfully, tool, tool 2, tool change, tool tool, trash, type, weirdity, wheezy, xterm
Posted in Gnome, Linux, Linux and FreeBSD Desktop | 1 Comment »

How to enable Ctrl+Alt+Backspace in Ubuntu 11.10 (Oneiric Ocelot) Linux

Monday, January 16th, 2012

My sister, experience some programs running with wine (Windows Emulator) to crash on her Ubuntu 11.10.
As she is quite new with Linux, she has no idea about the existence of CTRL ALT BACKSPACE key combination to restart a hanged GNOME, KDE by directly killing the Xorg server.

I felt obliged to explain her it is better to use CTRL ALT BACKSPACE X kill switch instead of restarting the whole Linux kernel (which basiclly is working) and that it is just the display keeping blacnk.

Pressing the would kill Xorg and therefore all applicatins previously running on top of it will die. In Ubuntu Xorg is configured to run via gdm, so once killed it will automatically reload the GDM (Gnome Display Manager).

I was about to explain her that its better she use CTRL+ALT+BACKSPACE instead of restarting the whole system but suddenly I realized this is not working.

In UBUNTU 11.10 and I guess in all UBUNTU's after 9.04 CTRL ALT BACKSPACE is substituted with the key switch combination ALT PRINTSCREEN K, I've explained her about that.

This change is actually a change implied by most Linux distributions nowdas and is some kind of change in Xorg newer versions…
To enable back the CTRL + ALT + BACKSPACE , I've issued cmd:

stanimira@ubuntu~:$ echo' setxkbmap -option terminate:ctrl_alt_bksp' >> ~/.xinitrc

An alternative way to set setxkbmap -option terminate:ctrl_alt_bksp to run on Ubuntu user login is by setting it as a startup application using;

stanimira@ubuntu:~$ gnome-session-properties

Press the Add button and type in the box to appear;
Name: setxkbmap Command: setxkbmap -option terminate:ctrl_alt_bksp Comment: setxkbmap

Reverting the Xserver kill switch back to the classical Ctrl+Alt+Backspace should also be running fine on older Ubuntu Linuces – 11.04, 10.10, 10.04 etc.

Tags: add button, Alt, Auto, backspace, Button, change, Comment, Ctrl, Display, Draft, existence, GDM, Gnome, kde, key switch, kill, kill switch, Linux, linux kernel, login, most linux distributions, ocelot, option, Press, printscreen, Reverting, session properties, setxkbmapCommand, startup, startup application, switch combination, type, Ubuntu, wine, wine windows, xinitrcAn, Xorg, xserver
Posted in Linux, Linux and FreeBSD Desktop | No Comments »

Fix to GNOME Pulseaudio server crappy sound on Debian GNU / Linux – PulseAudio Debian Workaround

Sunday, January 8th, 2012

I've faced some issues with crappy sound in some of the games I'm playing on my Debian . Also I ometimes, have issues with sound while watching movies with VLC or Totem... Sound issues with Skype are also seldomly occuring during skype calls etc. etc.

Recently I've realized many of this crappy sound issues origins from PulseAudio – the sound server GNOME desktop env uses to manage all sound just before passing it through ALSA.

I've found on the internet many suggested ways on how to workaround these issues. Many of the things suggested as workarounds, however was outdated and referred to old versions of GNOME / Pulseaudio and therefore was unusable on my Debian 6 Squeeze….

What I found most helpful is fixes and workarounds for pulseaudio list compiled by people in the Fedora community on fedorasolved.org's website – http://fedorasolved.org/Members/fenris02/pulseaudio-fixes-and-workarounds

Some of the fixes and work arounds suggeted on the above link, I have already applied, others was not applicable for Debian.

Anyways the things which I found most important and I believe many people who runs Debian need to implement from the list to solve pulseaudio crappy sound issues is concluded in the below 5 steps.

1. Install few packages related to pulseaudio

apt-get install paman padevchooser paprefs pulseaudio pulseaudio-esound-compat pulseaudio-module-x11 pulseaudio-module-zeroconf pulseaudio-utils

2. Edit ~/.asoundrc and include

pcm.pulse { type pulse }
ctl.pulse { type pulse }

Quickest way is by issuing:

echo 'pcm.pulse { type pulse }' >> ~/.asoundrc echo 'ctl.pulse { type pulse }' >> ~/.asoundrc

3. Change in the pulseaudio server configuration file ( /etc/pulse/daemon.conf ):

debian:~# vim /etc/pulse/daemon.conf

Look up for the lines:

; default-fragments = 4 ; default-fragment-size-msec = 25

Substitute this two lines with:

default-fragments = 8 default-fragment-size-msec = 5

4. Enable Simultaneous Output in PulseAudio preferences

Navigate to the GNOME menus:

System -> PulseAudio Preferences

Choose the "Simultaneous Output" tab and select:
PulseAudio simultaneous output

Add virtual output device for simultaneous output on all local sound cards

5. Log Off Gnome and restart PulseAudio

To load the new changed settings in /etc/pulse/daemon.conf restart of pulseaudio server is required, right after a Logoff from the current opened gnome session;

To do so LogOff with the trivial:

System -> Log Out

Press CTRL+ALT+F1, login with root and issue:

debian:~# /etc/init.d/pulseaudio restart ...

N.B.; In some cases it might be necessery to do some adjustments are made in gstreamer properties , to change settings there launch:

Tampering with gstreamer-properties used to fix for me some problems with ALSA and PulseAudio in the past, so it might be worthy to check it out and experiment a bit with it as well.

debian:~$ gstreamer-properties

Screenshot gstreamer Multimedia System Selector

Now many of the crappy sound games or applications should start working just fine. Enjoy 😉

Tags: alsa, asoundrc, asoundrcecho, Auto, change, configuration file, crappy, debian gnu, default fragment, Desktop, Draft, fedora, file, fragment size, fragments, games, Gnome, gnome desktop, gnu linux, Install, Linux, login, look, msec, occuring, old versions, org members, origins, OutLogin, Output, padevchooser, Press, pulse type, quot, right, root, server configuration, Skype, sound server, tab, type, vim, VLC, work
Posted in FreeBSD, Gnome, Linux, Linux and FreeBSD Desktop | 1 Comment »

How to add repository manually from command line in Ubuntu Linux

Sunday, January 8th, 2012

I'm on a way trying to install Free Mega Games Pack and I'm facing troubles in following the instructions to add a the latest development wine version described on http://www.winehq.org/download/ubuntu
The guys from WineHQ has to update the wine install instructions, since the instructions are targetting older versions of Ubuntu which are not compatible with newer Ubuntus which comes natively with Unity
In order to complete the step in adding the WineHQ Ubuntu PPA development repository my only way was to add it using command line.
Here is how:

root@ubuntu:~# apt-add-repository ppa:ubuntu-wine/ppa You are about to add the following PPA to your system: Latest official WineHQ releases Welcome to the Wine Team PPA. Here you can get the latest available Wine betas for every supported version of Ubuntu. This PPA is managed by Scott Ritchie, and is a replacement for the WineHQ budgetdedicated.com repository used for Jaunty and earlier. More info: https://launchpad.net/~ubuntu-wine/+archive/ppa Press [ENTER] to continue or ctrl-c to cancel adding it Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /tmp/tmp.bvo21sFWKG --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver hkp://keyserver.ubuntu.com:80/ --recv 883E8688397576B6C509DF495A9A06AEF9CB8DB0 gpg: requesting key F9CB8DB0 from hkp server keyserver.ubuntu.com gpg: key F9CB8DB0: public key "Launchpad PPA for Ubuntu Wine Team" imported gpg: no ultimately trusted keys found gpg: Total number processed: 1 gpg: imported: 1 (RSA: 1)

Similarly adding a PPA repository on Debian is also possible by using a little shell script add-apt-repository.sh . add-apt-repository.sh simulates what ubuntu's apt-add-repositry python script does.

It is educative to mention PPA stands for (Personal package Archive) and the difference between normal repository and PPA is mainly in the fact that PPA repositories makes a package distributed by the repository like the native Ubuntu packages issued by Canonical.
Once for example a new version of a file is placed in PPA deb package repository, the newer package will be automatically installed to the system using it.

Tags: AEF, Auto, betas, bvo, com, differen, Draft, file, Free, games pack, info, keyserver, Linux, little shell, mega games, official, older versions, Pack, package, package archive, personal package, ppa, Press, public key, python, python script, quot, recv, replacement, repository, root, scott ritchie, sFWKG, Shell, shell script, time conflict, tmp, Ubuntu, Ubuntus, unity, wine, wine team, WineHQ
Posted in Linux, Linux and FreeBSD Desktop, System Administration | No Comments »

How to Screenshot single Windows on GNU / Linux GNOME Desktop

Friday, October 28th, 2011

Every now and then I have to screenshot particular windows positioned on the screen on my GNOME Desktop envronment
Recently I was happy to find there is a very easy way to do this with the default Screenshotting program that is bundled with gnome gnome-screenshot

To screenshot a particular window using gnome-screenshot , its quite easy all one has to do is point the mouse cursor to the window he wants to snapshot and press:

Alt + PrtScr (Print Screen)

Here is a screenshot, I’ve taken of my gnome-terminal using the above command:

Particular window Screenshot Window screenshotting using GNOME gnome-screenshot

One can do it also via the command line using the /usr/bin/gnome-screenshot , by pressing Alt + F2 to invoke the run application and type in:

/usr/bin/gnome-screenshot -w

I was quite happy to find out that this is possible on Linux inside gnome without bothering to run GIMP or use any external programs for the cause. Hope this helps someone 😉

Tags: Alt, application, cause, command, cursor, Desktop, envronment, f2, GIMP, Gnome, gnome desktop, gnu linux, Hope, line, Linux, linux gnome, mouse, mouse cursor, nbsp, Press, Print, PrtScr, run, screen, screenshot, Screenshotting, snapshot, someone, type, usr, usr bin, way
Posted in Linux, Linux and FreeBSD Desktop | No Comments »

How to add a Google maps geographic location and pinpoint it with a baloon

Wednesday, September 28th, 2011

I needed to add to a wordpress based website Google maps location pictures with Google Maps Zoom In / Out controls.

I've seen plenty of plugins available that said to to this but none of them really worked fine for me. Either the plugins I checked in wordperss.org was too complex to set up and required a Google API registration or was marked as Broken (not working).

Finally to add the geographic locations taken from maps.google.com I used the embed code generated directly from maps.google.com.

But that was not the end of my WordPress Google Maps struggles. What followed was rather ridiculous, it seems since some time Google removed the pinning of a location searched for. Moreover the easy old way to simply pin a location on the map is also, gone.

Hence here is what I had to do to pinpoint location on the Google map of my searched country destination:

1. To be able to pinpoint the location, I had to login to my gmail
2. Go to http://maps.google.com in browser
3. Press on My Places button
4. Click on Create map and fill in the Title and Description dialogs
5. The Privacy and Sharing radio button should be selected
6. Click on Done and Save buttons
7. From the left top corner inside the Google map image to select the baloon picture (Add a Placemark) 8. Choose the exact desired placemark type and color from the next appearing dialog
9. Choose the location I want to pin on the map

I've created also a small Video tutorial just for fun for all those who want to see the pin a location with a baloon 😉 on the google map tutorial, here is the video as well:

For all people who can't properly see the .mov video here is link to the video created with recordmydesktop on my Linux showing how the baloon pinning inside a map can be done.

Tags: API, apple, Auto, baloon, browser, Button, Click, codebase, com, Done, Draft, embed code, freak, fun, geographic location, Gmail, google, google map, google maps, height, How to, Image, Linux, location, login, lt, Map, Maps, nbsp, none, object classid, org, pinning, plenty, Press, Privacy, quot, radio button, recordMyDesktop, time, tutorial, type, video, way, width, Wordpress, Wordpress Google Maps, zoom
Posted in Everyday Life, Various, Web and CMS, Wordpress | 2 Comments »

What is Xorg’s server DPMS module for? And how to use it to reduce your computer power consumption

Thursday, April 21st, 2011

As I’m manually configuring a Xserver via xorg.conf I have noticed a block of code in:

Section "Monitor" Identified "Generic Monitor" Option "DPMS" EndSection That triggered my curiousity to research further what is DPMS . A very quick google search revealed that DPMS’s purpose is to communicate to communicate between the monitor and the computer, to make the computer turn off the (CRT or LED) based monitor if the computer is not used

Thus in short to rephrase DPMS is a power saving handy Xorg feature. I many custom configured xorg.conf like the mine I’m building right now does not include DPMS as many people doesn’t have idea what DPMS is and how to enable it.

DPMS is also an interface to the Energy start power-saving capability if not all, most of the modern day monitor screens.

DPMS enables the Xserver to control automatically the computer screen and thus reduces the overall computer power consumption.

To enable the use of DPMS on my Linux, all I had to do is place a couple of configuration directives in my xorg.conf .:
Here is how I enabled DPMS in my Xorg server:

1. Edit with a text editor /etc/X11/xorg.conf

2. Find the Monitor Section , e.g.:

Section "Monitor" .... EndSection

3. Add inside the Monitor Section Options "DPMS" "true"

4. Lookup for the ServeryLayout section , e.g.:

Section "ServerLayout" ... EndSection

5. Place inside the ServerLayout section For instance the following options:

Option "StandbyTime" "20" Option "SuspendTime" "10" Option "OffTime "25"

You might like to change the options StandbyTime, SuspendTIme or OffTime to match your likings.
6. As a last step restart the Xorg server.

Press Ctrl+Alt+BackSpace or by issuing:

host:~# pkill -HUP X

Test that DPMS is loaded properly by reviewing /var/log/Xorg.0.log for example:

host:~# grep -i /var/log/Xorg.0.log (II) Loading extensions DPMS

Tags: Alt, backspace, capability, computer power consumption, computer screen, configuration directives, consumption, CRT, curiousity, custom, dpms, feature, google, instance, interface, likings, Linux, OffTime, option, place, power, Press, rephrase, screen, screens, Search, server press, StandbyTime, text, turn, Xorg, xserver, xtest
Posted in Linux, Linux and FreeBSD Desktop, Linux Audio & Video | No Comments »

☩ Walking in Light with Christ – Faith, Computing, Diary

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Restoring sudden disappeared (deleted) Android Phone Contacts and Data on ZTE, Samsung, LG and Huawei mobile phones

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