Zabbix agent installation on Linux EXPLAINED!

Zabbix is free monitoring software!
It is open source!
It is server-client based! It can monitor Linux, AIX, Windows servers! I will write more detail about it later!

How to install zabbix agent on Linux? Easy!!!

Steps are:
1. download agent
2.on server create user zabbix

server#useradd zabbix

3. Move it to home dir

server#mv download_location/zabbix_agents_2.0.4.linux2_6.amd64.tar.gz /home/zabbix

4.Untar it!

server#tar xzvf zabbix_agents_2.0.4.linux2_6.amd64.tar.gz
 
server## ls
bin  conf  sbin  zabbix_agents_2.0.4.linux2_6.amd64.tar.gz
5.  In conf folder, you will find default configuration! From version 2.0.x zabbix conf file should be located in /usr/local/etc/ folder.

If you install zabbix agent this way, you will need to find somewhere service zabbix! I just copied it from some other server!

server2#scp /etc/init.d/zabbix_agentd server1:/etc/init.d/

6.To start zabbix agent, execute

server1#/etc/init.d/zabbix_agentd start

7. Check if agent is running

server1# ps aux |grep zabbix
root      2531  0.0  0.0  13436   708 ?        S    12:45   0:00 /home/zabbix/sbin/zabbix_agentd
root      2533  0.0  0.0  13436   756 ?        S    12:45   0:01 /home/zabbix/sbin/zabbix_agentd
root      2534  0.0  0.0  13444   932 ?        S    12:45   0:00 /home/zabbix/sbin/zabbix_agentd
root      2535  0.0  0.0  13444   932 ?        S    12:45   0:00 /home/zabbix/sbin/zabbix_agentd
root      2536  0.0  0.0  13444   932 ?        S    12:45   0:00 /home/zabbix/sbin/zabbix_agentd
root      2537  0.0  0.0  13444   932 ?        S    12:45   0:00 /home/zabbix/sbin/zabbix_agentd
root      2538  0.0  0.0  13444   932 ?        S    12:45   0:00 /home/zabbix/sbin/zabbix_agentd
root      3220  0.0  0.0 103248   836 pts/1    S+   13:57   0:00 grep zabbix
8. On zabbix server check if you can communicate with zabbix agent

#  /zabbix_server_location/bin/zabbix_get -s server1_IP -k agent.version
2.0.4
In case that your response is like this

#  /zabbix_server_location/bin/zabbix_get -s server1_IP -k agent.version
zabbix_get [9917]: Get value error: cannot connect to [[server1_IP]:10050]: [111] Connection refused

you have communication issue!

To solve this, check following:

1.Check iptables on server1! Port 10050 and 10051 need to be open!

server1#iptables -I INPUT 5 -p tcp --dport 10050 -s zabbix_server_ip -j ACCEPT
server1#iptables -I INPUT 5 -p tcp --dport 10051 -s zabbix_server_ip -j ACCEPT

2. check if zabbix_agent is running

server1#ps aux |grep zabbix

3.try telnet to zabbix server with port 10050

server1#telnet zabbix_server_ip 10050


It is wise to put zabbix agent service to start after reboot

server1#chkconfig --level 345 zabbix_agentd on