galera – moiji-mobile

MariaDB Galera and custom health probe for Azure LoadBalancer

2017-05-06 hfreyther

My Galera set-up on Kubernetes and the Azure LoadBalancer in front of it seem to work nicely but one big TODO is to implement proper health checks. If a node is down, in maintenance or split from the network it should not be part of the LoadBalancer. The Azure LoadBalancer has support for custom HTTP probes and I wanted to write something very simple that handles the HTTP GET, opens a MySQL connection to the destination, check if it is connected to…

Troubleshooting Kubernetes/Azure Storage

2017-04-24 hfreyther

In my previous posts I wrote about my set-up of MariaDB Galera on Kubernetes. Now I have some first experience with this set-up and can provide some guidance. I used an ill-fated TCP health-check that lead to MariaDB Galera blocking the originating IPv4 address from accessing the cluster due to never completing a MySQL handshake and it seems (logs are gone) that this lead to the sync between different systems breaking too. When I woke up my entire cluster was down and…

Starting to use the Galera cluster

2017-04-03 hfreyther

In my previous post I wrote about getting a MariaDB Galera cluster started on Kubernetes. One of my open issues was how to get my existing VM to connect to it. With Microsoft Azure the first thing is to add Network peering between the Kubernetes cluster and the normal VM network. As previously mentioned the internal IPv4 address of the Galera service is not reachable from outside and the three types of exposing a service are: LoadBalancer ClusterIP NodePort While the default Microsoft…

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