Linux Administrator: Zabbix 7.0 : Add Monitoring Target (CentOS)

Saturday, November 29, 2025

Zabbix 7.0 : Add Monitoring Target (CentOS)

	Add Monitoring Target Host. Add a CentOS Stream 9 server as an example on here.
[1]	Install Zabbix Agent on the server you'd like to add for monitoring target.

[root@node01 ~]# dnf -y install https://repo.zabbix.com/zabbix/7.0/centos/9/x86_64/zabbix-release-7.0-5.el9.noarch.rpm

[root@node01 ~]# dnf -y install zabbix-agent2
[root@node01 ~]# vi /etc/zabbix/zabbix_agent2.conf
# line 80 : specify Zabbix server

Server=10.0.0.30
# line 133 : specify Zabbix server

ServerActive=10.0.0.30
# line 144 : change to your hostname

Hostname=node01.srv.world
[root@node01 ~]# systemctl enable --now zabbix-agent2

[2]	If SELinux is enabled, change policy.

[root@node01 ~]# setsebool -P domain_can_mmap_files on

[root@node01 ~]# vi zabbix_agent.te
# create new

module zabbix_agent 1.0;

require {
        type initctl_t;
        type zabbix_agent_t;
        type devlog_t;
        type proc_kcore_t;
        type rpm_exec_t;
        type rpm_var_lib_t;
        class fifo_file getattr;
        class sock_file getattr;
        class file { execute execute_no_trans map open getattr };
}

#============= zabbix_agent_t ==============
allow zabbix_agent_t devlog_t:sock_file getattr;
allow zabbix_agent_t initctl_t:fifo_file getattr;
allow zabbix_agent_t proc_kcore_t:file getattr;
allow zabbix_agent_t rpm_var_lib_t:file open;
allow zabbix_agent_t rpm_exec_t:file { execute execute_no_trans map };

[root@node01 ~]# checkmodule -m -M -o zabbix_agent.mod zabbix_agent.te

[root@node01 ~]# semodule_package --outfile zabbix_agent.pp --module zabbix_agent.mod

[root@node01 ~]# semodule -i zabbix_agent.pp

[3]	If Firewalld is running, allow Zabbix related ports.

[root@node01 ~]# firewall-cmd --add-port=10050/tcp

success
[root@node01 ~]# firewall-cmd --runtime-to-permanent

success

[4]	Login to Zabbix admin site with [Admin] user and select [Data collection] - [Hosts] on the left pane, then click [Create Host] button on the right pane.

[5]	Input a hostname for [Hostname] field, input any name you like for [Visible name] field, select a group or add a new group for [Groups] field, input IP address and DNS name for [Interfaces] field. For monitoring items, there are many templates, click [Select] button that is in [Templates] field.

[6]	Click [Select] button.

[7]	Select [Templates/Operating systems].

[8]

Select [Template OS Linux by Zabbix agent active].
The difference between having [active] and not having it is that without [active], the Zabbix server requests the Zabbix agent to send data and the data is sent, while with [active], the Zabbix agent sends data to the Zabbix server according to the configuration.
There is not much difference in the items that can be monitored, but with [active], log monitoring is also possible, so set it with [active] on here.
However, when there are a large number of hosts to be monitored, you must also consider the load on the Zabbix server when setting with [active].