This is a test environment for a small Patroni cluster, in order to test HA, failover, and other tools. This repository will eventually include a functional test suite.
clone Patroni into a separate directory.
checkout the branch you want to test.
make a shallow copy of the patroni repo into patroni-compose/patroni
make any changes to the configuration you want in scripts/entrypoint.sh
make any changes to the cluster setup by creating a new compose file
start the cluster using docker-compose up -d, e.g.
docker-compose -f patroni-compose-etcd-3.yml up -d
use docker-compose logs to see if the cluster came up properly:
docker-compose -f patroni-compose-etcd-3.yml logs
start testing the cluster in other ways
Shut down the test cluster with:
docker-compose -f patroni-compose-etcd-3.yml stop
- docker 1.8+
- docker-compose 1.4+
Kill the master and see if failover works. For example, if the master is node2:
docker stop dbnode2_1
add a node and see if it joins the cluster:
docker-compose -f patroni-compose-addnode.yml up -d
Note that if you add a node using the addnode compose script, you will need to shut it down separately with:
docker-compose -f patroni-compose-addnode.yml stop
If you take down the docker-compose cluster after a failed test run, and bring it back up, you may find that PostgreSQL doesn't start. This is because the etcd server still has a record for the failed master, but there's no valid node in the cluster.
The solution to this is to remove all the containers and start fresh:
docker-compose -f patroni-compose-etcd-23.yml rm
If you've done several addnodes, etc., you may need to look a "docker ps -a" and "rm" multiple containers by hand.