February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third Edition
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How to do it...
For this scenario, the server at 10.0.30.1 is the primary PostgreSQL server, and 10.0.30.2 will be the new copy. On all PostgreSQL servers, our data directory should be located at /db/pgdata.
Follow these steps to build a PostgreSQL hot standby:
- Ensure that the pg_hba.conf file on the primary server contains this line:
host replication rep_user 10.0.30.2/32 trust
- Set the wal_level and max_wal_senders parameters in postgresql.conf to the following (or higher) values on the primary server:
wal_level = logical max_wal_senders = 10
- If these settings weren't already at or above these levels, restart PostgreSQL on the primary server. Debian-based systems can use a command like this:
sudo systemctl restart postgresql@12-main ...
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