check_mk: Check APT updates

On your check_mk install under the WATO menu navigate to 'Monitoring Agents' find and click on the link for 'Check for APT updates (Debian, Ubuntu)'. This is the check plugin to add to the server so copy that code. Copy the contents of that check... » More

ThingsBoard API: Get Auth Token

The auth token will be required for future API requests. I did the following using the Insomnia REST client: As a curl command that would be: curl -X POST --header 'Content-Type: application/json' --header 'Accept: application/json' -d... » More

Blink Hard Disk Light on Dell

To blink the light on a hard disk on Dell Server from the command line first get a list of the physical disks so you can check the disk ID: omreport storage pdisk controller=0 then to blink the disk: omconfig storage pdisk action=blink... » More

check_mk: Emails Not Sent

On a CentOS 7 server with postifx already installed and working I found the emails from check_mk / OMD were not being sent. I needed a symlink for sendmail: ln -s /usr/lib/sendmail.postfix /usr/lib/sendmail Test with su - omduserecho... » More

check_mk: monitor that a process exists

WATO > Manual Checks and click on "State and Count of Processes" Add the description, check-type, process name and process matching and set the levels for the number of these processes that are expected:

check_mk: Check for Yum Updates

Visit the page below to download the mkp package: https://checkmk.de/check_mk-exchange-file.php?&file=linux-updates-1.0.mkp Upload the mkp package to your check_mk server then install it : OMD:~$ mkp -v install linux-updates-1.0.mkp On... » More

CLI RAID Disk Layout on Dell Servers

Newer iDRAC web interfaces show the physical and virtual disks on a PERC controller but for older servers with an old iDRAC use openmanage on the command-line. To view a list of the physical disks: omreport storage pdisk controller=0 To... » More

check_mk: Monitor Nginx Status

On the Check_mk web UI visit:WATO menu > Monitoring Agents In the list on check agents you should find the nginx_status. Clicking on it shows the code for the check. Copy that code to the client server. The location on web001 for the check (for me... » More

check_mk: Add Custom Notes to Services

The scenario here is that I would like to add a 'custom notes' link to any services with the word 'postfix' in the name of the service. I started by visiting WATO and drilling down to a host and one of the services I was interested in adding notes... » More