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| Create ssh keys for the checkmk user, and copy the public key to your openwrt device | Create ssh keys for the checkmk user, and copy the public key to your openwrt device and place it in `/etc/dropbear/authorized_keys` |
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| ssh-copy-id root@192.168.1.13 | scp /omd/sites/monitor/.ssh/id_rsa.pub root@192.168.1.13:/etc/dropbear/authorized_keys |
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| * https://forum.checkmk.com/t/how-to-install-check-mk-agent-for-openwrt/18073 |
Checkmk
Next generation monitoring.
Software
To get all the dependencies a small helper program is installed.
apt-get install gdebi
Download the checkmk package from the checkmk download page
wget https://download.checkmk.com/checkmk/2.0.0/check-mk-raw-2.0.0_0.buster_amd64.deb gdebi check-mk-raw-2.0.0_0.buster_amd64.deb
Create a site and start it
omd create monitor omd start monitor
Checkmk Agent
Install the agent on the system that should be monitored. Let xinetd handle it.
apt-get install xinetd wget http://checkmk/monitor/check_mk/agents/check-mk-agent_2.0.0-1_all.deb dpkg -i check-mk-agent_2.0.0-1_all.deb
Apt
Download the APT plugin from the server and place it in /usr/lib/check_mk_agent/plugins. Make sure it is executeable.
chmod 755 /usr/lib/check_mk_agent/plugins/mk_apt
Mariadb
Copy the mk_mysql plugin into /usr/lib/check_mk_agent/plugins/ and make it executeable
cd http://checkmk/monitor/check_mk/agents/plugins/mk_mysql http://checkmk/monitor/check_mk/agents/plugins/mk_mysql chmod 755 mk_mysql
Create the file /etc/check_mk/mysql.cfg and configure a user for mariadb authentication
[client] user=checkmk password=checkmkpassword
Openwrt
Log in to your openwrt device, download the check_mk_agent and make it executeable
opkg install curl curl http://checkmk/monitor/check_mk/agents/check_mk_agent.openwrt > /usr/bin/check_mk_agent chmod +x /usr/bin/check_mk_agent
Create ssh keys for the checkmk user, and copy the public key to your openwrt device and place it in /etc/dropbear/authorized_keys
su - monitor ssh-keygen -t rsa scp /omd/sites/monitor/.ssh/id_rsa.pub root@192.168.1.13:/etc/dropbear/authorized_keys
DNS Cache
Checmk maintains a DNS cache. If a host changes its IP-address, checkmk will not know this. The solution is to update the DNS cache.
su - monitor /opt/omd/versions/2.0.0p1.cre/bin/check_mk --update-dns-cache
Another option is to go to Setup -> General -> Global settings -> Execution of checks -> Use DNS lookup cache and disable that feature.