26
Oct
2019

check_mk: Emails Not Sent

check_mk

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

24
Oct
2019

check_mk: monitor that a process exists

check_mk

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:

21
Oct
2019

check_mk: Check for Yum Updates

check_mk

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

18
Oct
2019

CLI RAID Disk Layout on Dell Servers

Uncategorized

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

16
Oct
2019

check_mk: Monitor Nginx Status

check_mk

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

08
Oct
2019

check_mk: Add Custom Notes to Services

check_mk

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

08
Oct
2019

check_mk: Customise Icon Visibility

check_mk

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

31
Aug
2019

Reboot Linux Server

Uncategorized

On a server where normal reboot commands such as 'shutdown -r now' are not working and if you don't have access to an iDrac or similar the following worked: echo 1 > /proc/sys/kernel/sysrq echo b > /proc/sysrq-trigger