For easier development using Docker the $HOSTNAME variable will be used to
name the running Patroni. Bumped some _segments postgresql settings to ensure
WAL files are not removed very quickly.
Increased the timeout for the post request for Patroni, as some operations
(failover) may take considerable time to complete.
The failover to a specific member was broken in patronictl as it used a wrong
key to specify the member to failover to.
Pretty printing fix for xlog lag, to prevent false negatives to show up and have
good alignment.
For managing Patroni clusters, the Patroni api can be used. For many tasks, a command line interface for
this api would be a useful addition. This commit adds patroncli (The name is still under debate).
The command line interface needs access to the DCS; this is required for any operation. For some tasks it is required
to have access to the Patroni api.
A small summary of the additions to get the cli/ctl started:
* Updated Docker image to use 'true' as the archive_command, to ensure disk not filling up during failover
testing.
* The cli currently can list members, failover a master and remove a given cluster from DCS.
* The cli can be configured with a command, for repeated access to the same DCS
* Added some simple tests for the cli, code coverage is very low
As the Dockerfile is there mainly to support developers, we want to build the Dockerfile using the current working
directory instead of a previously released version.
To help in developing features, the Dockerfile and its entrypoint have been extended.
The README.md explains stuff in detail, in short:
- you can now run a Patroni cluster with a single command
