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Optional fencing script (pre_promote) (#1099)

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Call a fencing script after acquiring the leader lock. If the script didn't finish successfully - don't promote but remove leader key

Close https://github.com/zalando/patroni/issues/1567
This commit is contained in:
Sergey Dudoladov
2020-09-01 07:50:39 +02:00
committed by GitHub
parent e87fc12aeb
commit 950eff27ad
8 changed files with 127 additions and 25 deletions
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docs/SETTINGS.rst
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@@ -267,6 +267,7 @@ PostgreSQL
- **remove\_data\_directory\_on\_rewind\_failure**: If this option is enabled, Patroni will remove the PostgreSQL data directory and recreate the replica. Otherwise it will try to follow the new leader. Default value is **false**.
- **remove\_data\_directory\_on\_diverged\_timelines**: Patroni will remove the PostgreSQL data directory and recreate the replica if it notices that timelines are diverging and the former master can not start streaming from the new master. This option is useful when ``pg_rewind`` can not be used. Default value is **false**.
- **replica\_method**: for each create_replica_methods other than basebackup, you would add a configuration section of the same name. At a minimum, this should include "command" with a full path to the actual script to be executed. Other configuration parameters will be passed along to the script in the form "parameter=value".
- **pre\_promote**: a fencing script that executes during a failover after acquiring the leader lock but before promoting the replica. If the script exits with a non-zero code, Patroni does not promote the replica and removes the leader key from DCS.
REST API
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