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...
These steps should be performed on the PgBouncer and HAProxy nodes, which will be referred to as pgha-proxy. Follow these instructions to disable the bdr_chicago node and then return it to service:
- Begin by disabling the Chicago server within HAProxy:
echo "disable server bk_db/bdr_chicago" | \ socat /var/run/haproxy/sock -
- Then tell PgBouncer to reconnect after transactions are complete and to wait until all connections have been reestablished:
psql -h pgha-proxy -U pgbouncer pgbouncer -c "RECONNECT" psql -h pgha-proxy -U pgbouncer pgbouncer -c "WAIT_CLOSE"
- Perform whatever maintenance is necessary on the Chicago node.
- Execute the following HAProxy command to re-enable the Chicago server:
echo "enable server bk_db/bdr_chicago" ...
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