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

check_mk: Customise Icon Visibility

By default check_mk places icons under a 'hamburger' icon as shown below. I wanted the 'Custom Notes' icon to be visible at all times rather than being located under the actions icon. To do that visit the 'Global Settings' menu item and under... » More