Tip: lock an instance against admin permissions
Couple of days ago I was looking for a way to lock an instance but something more powerful than a simple lock via the nova API.
Tip: Add a specific keypair to a flavor
Folsom brought a lot of new features, however while playing with nova-manage, I came across a new option, option that I found very useful and that I’m about to share with you.
Manage your symlinks with Pacemaker
Manages symlinks into a shared partition, which is shared among several machines.
Optimized your SSD
I would like to share with you readers some of the optimizations I made on the SSDs storing my Ceph Journals. This article has been placed into the ceph categorie, but it’s more general best practices SSDs.
Ceph: inject configuration without restart
Usually, you don’t always want to restart your daemon everytime you change your configuration. Fortunatly, Ceph supports parameter injection!
Highly Available LVS
Highly Available LVS.
Sorry I'm French...
Unusual post for unusual situation. Try to put an end to the massacre.
Ceph: placement groups
Quick overview about placement groups within Ceph.
Galera arbitrator resource agent
If you run XtraDB/Galera in a 2 nodes cluster, it implies that on a split-brain event both nodes will goes down. That’s the default behavior of the cluster management system of Galera. This could be changed but we don’t really want that. This is why we use garbd in order to prevent split-brain situation. Basically it connects to your cluster and acts as a member. Let’s say someone, inadvertently bring down the dedicated link interface of your cluster, you’re in big trouble. In this particular situation garbd will act as a replication replay. That will let you some time to investigate about the outage without any downtime.
Delete a VM in error state (Folsom)
Little update of my previous script for Folsom.