Chef Knife List Nodes with IPs

I had to fiddle a bit with this so possibly worth keeping a note of it. I wanted to pull all the node hostnames and ip addresses from chef for use in hostname lookups and ssh config. knife exec -E 'nodes.find("*:*") {|n| printf "%s - %s \n",... » More

Resetting MySQL root password on newer MySQL 5.7

In newer versions of MySQL it looks like the 'Password' field has been replaced with the 'authentication_string' field so older instructions online may not work. Stop the currently running MySQL service: systemctl stop mysql Start mysql... » More

LHT65 setup and UART Serial Connection

I wired a CP2102 USB to TTL Serial Converter to the LHT65 UART connector - see images below: Then on the linux command line ran: dmesg | tail to check the device name that was added by the system. I then connected to that serial device... » More

Proxmox: adding internal private nework

In this scenario I wanted to be able to run several VMs that can communicate with each other on a private subnet e.g. 10.10.10.* and also be access the internet for updates etc. Eventually I want to expose some of the internal services. My proxmox... » More

SELinux: Create Policy for NRPE Writing

Had a problem with Nagios/NRPE checks that are configured to write a status file as part of their check. The path /var/logstate was the target created the policy below. Andrew (Urban Penguin) Youtube video is an excellent resource. Install selinux... » More

Nagios NRPE omreport errors

Nagios check for Dell OpenManage was failing after upgrade to srvadmin 9.2 with: UNKNOWN: Problem running 'omreport chassis memory': Error: SMStatus: 700 UNKNOWN: Problem running 'omreport chassis batteries': Error! XML Transformation failed UNKNOWN:... » More

check_mk: Check http service

In the WATO menu choose 'Check Plugins' and then 'Networking checks without an agent'. Find the 'HTTP/HTTPS connection' option and then click on 'Check HTTP service' beside Parameter rule set: Scroll down to the bottom and click 'Create rule... » More

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