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How to gracefully reboot MariaDB Galera Cluster servers?

Cluster Configuration In this example configuration of two nodes, we assume that the servers are connected over private network. This allows direct connections without requiring SSH tunnels. The most important parts is to enable listening on IP protocol and to configure addresses and names of the cluster nodes. The config files are similar for each […]

Update oVirt hosted-engine host certificates VM if the are expired

Environment: Red Hat Virtualization 4.4 Issue:  All the hosted-engine hosts vdsm certificates are expired. The hosted-engine VM is down and it’s unable to start it using hosted-engine –vm-start because of expired certificates. Resolution: Since CA of the RHV environment is the RHV manager which is down, we have to get the CA certificates and keys to the host […]

Docker Cheat Sheet

Docker Terms This section defines some of the most useful Docker terms. Docker Image: A set of read-only files. These files are a part of an operating system that is required to run a Docker container. Dockerfile: A simple text file that contains all the commands a user could call in the command line to […]