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Refactor sample script in repmgrd-node-fencing.md

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This commit is contained in:
Ian Barwick
2016-11-23 09:21:14 +09:00
parent b54f98ed8a
commit 2588853e83
1 changed files with 18 additions and 16 deletions
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34
docs/repmgrd-node-fencing.md
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@@ -91,50 +91,52 @@ The actual script is as follows; adjust the configurable items as appropriate:
# Configurable items
PGBOUNCER_HOSTS="node1 node2 node3"
PGBOUNCER_DATABASE_INI="/etc/pgbouncer.database.ini"
PGBOUNCER_DATABASE="appdb"
PGBOUNCER_PORT=6432
REPMGR_DB="repmgr"
REPMGR_USER="repmgr"
REPMGR_SCHEMA="repmgr_test"
PGBOUNCER_CONFIG="/etc/pgbouncer.ini"
PGBOUNCER_INI_TEMPLATE="/var/lib/postgres/repmgr/pgbouncer.ini.template"
PGBOUNCER_DATABASE="appdb"
# 1. Pause running pgbouncer instances
for HOST in $PGBOUNCER_HOSTS
do
psql -t -c "pause" -h $HOST -p $PORT -U postgres pgbouncer
psql -t -c "pause" -h $HOST -p $PGBOUNCER_PORT -U postgres pgbouncer
done
# 2. Promote this node from standby to master
repmgr standby promote -f /etc/repmgr.conf
# 3. Reconfigure pgbouncer instances
PGBOUNCER_INI_NEW="/tmp/pgbouncer.ini.new"
PGBOUNCER_DATABASE_INI_NEW="/tmp/pgbouncer.database.ini"
for HOST in $PGBOUNCER_HOSTS
do
# Recreate the pgbouncer config file
echo -e "[databases]\n" > $PGBOUNCER_INI_NEW
echo -e "[databases]\n" > $PGBOUNCER_DATABASE_INI_NEW
psql -d $REPMGR_DB -U $REPMGR_USER -t -A \
-c "SELECT '$PGBOUNCER_DATABASE= ' || conninfo || ' application_name=pgbouncer_$HOST' \
-c "SELECT '${PGBOUNCER_DATABASE}-rw= ' || conninfo || ' application_name=pgbouncer_${HOST}' \
FROM ${REPMGR_SCHEMA}.repl_nodes \
WHERE active = TRUE AND type='master'" >> $PGBOUNCER_DATABASE_INI_NEW
psql -d $REPMGR_DB -U $REPMGR_USER -t -A \
-c "SELECT '${PGBOUNCER_DATABASE}-ro= ' || conninfo || ' application_name=pgbouncer_${HOST}' \
FROM $REPMGR_SCHEMA.repl_nodes \
WHERE active = TRUE AND type='master'" >> $PGBOUNCER_INI_NEW
WHERE node_name='${HOST}'" >> $PGBOUNCER_DATABASE_INI_NEW
cat $PGBOUNCER_INI_TEMPLATE >> $PGBOUNCER_INI_NEW
rsync $PGBOUNCER_DATABASE_INI_NEW $HOST:$PGBOUNCER_DATABASE_INI
rsync $PGBOUNCER_INI_NEW $HOST:$PGBOUNCER_CONFIG
psql -tc "reload" -h $HOST -U postgres pgbouncer
psql -tc "resume" -h $HOST -U postgres pgbouncer
psql -tc "reload" -h $HOST -p $PGBOUNCER_PORT -U postgres pgbouncer
psql -tc "resume" -h $HOST -p $PGBOUNCER_PORT -U postgres pgbouncer
done
# Clean up generated file
rm $PGBOUNCER_INI_NEW
rm $PGBOUNCER_DATABASE_INI_NEW
echo "Reconfiguration of pgbouncer complete"