76 lines
2.1 KiB
Text
76 lines
2.1 KiB
Text
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both the primary and secondry server need the same postgreSQL version.
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in my case :
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-primary serv : 10.184.116.91
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-secondary serv : 10.184.116.237
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# 1 # on the primary server
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Dans postgresql.conf :
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wal_level = replica (ou logical)
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max_wal_senders = X
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1 par client par streaming
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défaut : 10
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wal_sender_timeout = 60s
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#create replication user
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CREATE USER replicator WITH REPLICATION ENCRYPTED PASSWORD 'replicaPassword';
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#inside of the pg_hba.conf file add the following line:
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host replication replicator 10.184.116.137/24 scram-sha-256
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#reload config
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psql -c "select pg_reload_conf();"
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#in case of issue, exit from postgres user to go back to root and use:
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systemctl restart postgresql
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#you can then switch back to postgres user
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su -- postgres
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# 2 # on the replica server
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#verify connection between primary and secondary server
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telnet 10.184.116.91 5432
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#stop postgresql
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systemctl stop postgresql
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#backup secondary server existing data
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sudo su postgres
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cp -R /var/lib/postgresql/17/main/ /var/lib/postgresql/17/main_bak/
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rm -rf /var/lib/postgresql/17/main/
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#initialize the replica with pg_basebackup
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pg_basebackup --host=10.184.116.91 --pgdata=/var/lib/postgresql/17/main/ --username=replicator --progress --verbose --write-recovery-conf --wal-method=stream --create-slot --slot=replicaslot1
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#confirm replica creation by checking existence of standby.signal file:
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ls -ltrh /var/lib/postgresql/17/main/
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# 3 # you can then test the replication
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#if there was already a database on the primary server, check on the secondary server if it exist as well
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\l+
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#you should see the same content when you use the same command on the primary server
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#try creating a new database
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# on the primary server, create and fill a db
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create database replica_test;
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\c replica_test
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create table users (id serial primary key, username text);
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insert into users (username) values ('Superman');
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insert into users (username) values ('Batman');
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insert into users (username) values ('Spiderman');
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# on the replica server check existence of newly created db and check it's content
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\l
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\c replica_test
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select * from users;
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