- Defer SIGCHLD processing until the later stage in order to allow
subprocess to run its own reaping of children and return the correct
exit code from the process called.
- When changing the password at startup, do not assume the user postgres.
This method suppose to watch for changes of leader key if current node
is not leader and also it could watch for changes in a members list if
current conde is the leader.
`Cluster.leader` is not reference to `Member` anymore, but to `Leader`
`Leader` class contains field `index` (update index). This field is very
useful for watching for events which changing leader key. Also `Leader`
contains `member` field, which should reference real member.
- add unit tests for the restore module
- additional dependencies in requirement
- harden the code that calls restore callbacks
- remove WAL-E related code from postgresql.py
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
Due to the renaming of Governor to Patroni some old references needed to be updated.
Also some python packages need to be added.
Added entrypoint.sh as a script, to ensure Patroni will have PID = 1 when the container is run.
- make sure all parameters are taken from the env variables.
- make sure WAL-E code is not involved if the image is not configured for it
- pick up pg_basebackup as an alternative if WAL-E fails.
The WAL-E support will be switched on in subsequent commits.
Implement callback actions for patroni in order to call external script on different events in the server lifecycle, supported are on start, stop, restart, reload and role change (which covers both promote and demote). A callback should receive 3 arguments: action, role and cluster name (in this order), and can do things like tagging the EC2 instances associated with PostgreSQL, or notifying the DBA when the master had been demoted.
A sample callback that assigns tags to AWS instances is provided.
Alexander Kukushkin