21

Oct

2019

check_mk: Check for Yum Updates

October 21, 2019 jonny 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

October 18, 2019 jonny 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

October 16, 2019 jonny 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

October 8, 2019 jonny 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

October 8, 2019 jonny 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

14

Sep

2019

Increase xfs root partition on AWS instance without LVM

September 14, 2019 jonny Uncategorized

On an EC2 instance with an EBS volume of 200GB I right-clicked the volume and chose to 'Modify Volume', then set a new size for the disk. On the OS (RHEL 7.6) you can check that the new size of the disk is visible with: fdisk... » More

31

Aug

2019

Reboot Linux Server

August 31, 2019 jonny 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

27

Aug

2019

iptables: direct traffic from one port to an alternate port

August 27, 2019 jonny Uncategorized

Requirement was to run a process on a server on a new port but the original port was hard-coded into the client so we needed to redirect all traffic bound for the original port to the new port. First check the IP Forwarding is enabled. sysctl... » More

21

Aug

2019

Accessing iDRAC 6 with IE Compatibility Mode

August 21, 2019 jonny Uncategorized

Had difficulty accessing an old iDRAC 6 interface with a more recent release of a web browser. Some of the drac interface shows but you get 404 error messages. The solution was accessing it via the compatability mode on IE: Then add the... » More

30

Jul

2019

Bash to Python – Playing with CSV

July 30, 2019 jonny python

In the past I have been too willing to use bash scripts for grepping and awking CSV files. The code snippet below is a starter for doing similar with python and while far from perfect, demonstrates calling another system command and manipulating... » More