From f36f44cc0dad5122966d8d263ad9e012d18aa748 Mon Sep 17 00:00:00 2001 From: adoralaura Date: Tue, 14 Jan 2025 16:09:06 +0100 Subject: [PATCH] add replication --- ...s15 Streaming Replication - Debian 12.html | 976 ++++++++++++++++++ 1 file changed, 976 insertions(+) create mode 100644 Postgres15 Streaming Replication - Debian 12.html diff --git a/Postgres15 Streaming Replication - Debian 12.html b/Postgres15 Streaming Replication - Debian 12.html new file mode 100644 index 0000000..a2b2cef --- /dev/null +++ b/Postgres15 Streaming Replication - Debian 12.html @@ -0,0 +1,976 @@ + +Debian 12 Bookworm : PostgreSQL 15 : Streaming Replication : Server World + + + + + + +
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PostgreSQL 15 : Streaming Replication2023/07/05

+
+ + + + + + + + + + + + + +
  +
+Configure PostgreSQL Streaming Replication.
+This configuration is common Primary/Replica settings. +
+
[1] +
+Install and start PostgreSQL Server on all Nodes, refer to here [1]. +
+
[2]Configure Primary Node. +
+ + + + +
+
+root@www:~#
vi /etc/postgresql/15/main/postgresql.conf
+
+
# line 60 : uncomment and change

+listen_addresses = '
*
' +
+
+
# line 205 : uncomment

+wal_level = replica +
+
+
# line 210 : uncomment

+synchronous_commit = on +
+
+
# line 308 : uncomment (max number of concurrent connections from streaming clients)

+max_wal_senders = 10 +
+
+
# line 322 : uncomment and change

+synchronous_standby_names = '
*
' +
+
+root@www:~#
vi /etc/postgresql/15/main/pg_hba.conf
+
# add to the end
+# host replication [replication user] [allowed network] [authentication method]

+
host    replication     rep_user        10.0.0.30/32            scram-sha-256
+host    replication     rep_user        10.0.0.51/32            scram-sha-256
+
+
+
# create a user for replication

+root@www:~#
su - postgres

+postgres@www:~$
createuser --replication -P rep_user

+Enter password for new role:  
# set any password

+Enter it again: +
+postgres@www:~$
exit
+
+root@www:~#
systemctl restart postgresql
+
+ + + + + +
[3]Configure Replica Node. +
+ + + + +
+
+
# stop PostgreSQL and remove existing data

+root@node01:~#
systemctl stop postgresql

+root@node01:~#
rm -rf /var/lib/postgresql/15/main/*
+
+
+
# get backup from Primary Node

+root@node01:~#
su - postgres

+postgres@node01:~$
pg_basebackup -R -h www.srv.world -U rep_user -D /var/lib/postgresql/15/main -P

+Password:  
# password of replication user

+30547/30547 kB (100%), 1/1 tablespace
+postgres@node01:~$
exit
+
+
+root@node01:~#
vi /etc/postgresql/15/main/postgresql.conf
+
+
# line 60 : uncomment and change

+listen_addresses = '
*
' +
+
+
# line 335 : uncomment

+hot_standby = on +
+root@node01:~#
systemctl start postgresql

+
+ + + + + +
[4]That's OK if result of the command below on Primary Node is like follows. +Verify the setting works normally to create databases or to insert data on Primary Node. +
+ + + + +
+postgres@www:~$
psql -c "select usename, application_name, client_addr, state, sync_priority, sync_state from pg_stat_replication;"

+
 usename  | application_name | client_addr |   state   | sync_priority | sync_state
+----------+------------------+-------------+-----------+---------------+------------
+ rep_user | 15/main          | 10.0.0.51   | streaming |             1 | sync
+(1 row)
+
+
+
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