pg_ Installation and use of RMAN "PostgreSQL"

pg_rman It's a special postgresql Design of online backup and recovery tools . It supports online and point in time backup , You can also create backup catalog To maintain the DB cluster Backup information .

• Easy to use . Backup and restore with one command .
• Support full online , Incremental backup , Archive backup .
• Support backup compression . adopt gzip Tools to achieve page compression .
• Automatic backup maintenance . Automatically delete expired WAL Backup file .
• Support backup verification .
• No transactions lost during recovery . Support based on PITR Configuration file generator for .

1. Download and install

Find the corresponding version to download , Default install to path /usr/pgsql-13/bin

https://github.com/ossc-db/pg_rman/releases
wget https://github.com/ossc-db/pg_rman/releases/download/V1.3.14/pg_rman-1.3.14-1.pg13.rhel8.x86_64.rpm

yum install pg_rman-1.3.14-1.pg13.rhel8.x86_64.rpm

2.PostgreSQL configuration

sed -ir "s/#*max_wal_senders.*/max_wal_senders = 10/" postgresql.conf
sed -ir "s/#*max_replication_slots.*/max_replication_slots= 10/" postgresql.conf
sed -ir "s/#*hot_standby .*/hot_standby = on/" postgresql.conf
sed -ir "s/#*wal_level.*/wal_level = replica/" postgresql.conf
sed -ir "s/#*archive_mode.*/archive_mode = on/" postgresql.conf
sed -ir "s/#*archive_command.*/archive_command = '\/bin\/true'/" postgresql.conf



#  Check 
cat postgresql.conf | grep "max_replication_slots\|max_wal_senders\|wal_level\|archive_mode\|archive_command\|hot_standby "

Restart after modification

systemctl restart postgresql-13

3. initialization

[[email protected] pg_rman]# /usr/pgsql-13/bin/pg_rman  --backup-path /lys/data/pg_rman  --pgdata /var/lib/pgsql/13/data --arclog-path /lys/data/arclog init
INFO: ARCLOG_PATH is set to '/lys/data/arclog'
INFO: SRVLOG_PATH is set to '/var/lib/pgsql/13/data/log'

4. Full volume backup

[[email protected] pg_rman]# /usr/pgsql-13/bin/pg_rman  --backup-path /lys/data/pg_rman  --pgdata /var/lib/pgsql/13/data --arclog-path /lys/data/arclog  backup -b full -U user001 -d db001 -h 127.0.0.1 -p 5432
Password for user user001:
INFO: copying database files
INFO: copying archived WAL files
INFO: backup complete
INFO: Please execute 'pg_rman validate' to verify the files are correctly copied.

5. Incremental backup

You must verify before incremental backup

[[email protected] pg_rman]# /usr/pgsql-13/bin/pg_rman  --backup-path /lys/data/pg_rman  --pgdata /var/lib/pgsql/13/data  validate
INFO: validate: "2022-07-28 08:04:54" backup and archive log files by CRC
INFO: backup "2022-07-28 08:04:54" is valid

[[email protected] pg_rman]# /usr/pgsql-13/bin/pg_rman  --backup-path /lys/data/pg_rman  --pgdata /var/lib/pgsql/13/data  show
=====================================================================
 StartTime           EndTime              Mode    Size   TLI  Status
=====================================================================
2022-07-28 08:05:51  2022-07-28 08:05:54  INCR      0B     1  ERROR
2022-07-28 08:04:54  2022-07-28 08:05:00  FULL    37MB     1  OK

[[email protected] pg_rman]# /usr/pgsql-13/bin/pg_rman  --backup-path /lys/data/pg_rman  --pgdata /var/lib/pgsql/13/data  validate
INFO: validate: "2022-07-28 08:08:05" backup and archive log files by CRC
INFO: backup "2022-07-28 08:08:05" is valid
[[email protected] pg_rman]# /usr/pgsql-13/bin/pg_rman  --backup-path /lys/data/pg_rman  --pgdata /var/lib/pgsql/13/data  show
=====================================================================
 StartTime           EndTime              Mode    Size   TLI  Status
=====================================================================
2022-07-28 08:08:05  2022-07-28 08:08:10  INCR    24kB     1  OK
2022-07-28 08:05:51  2022-07-28 08:05:54  INCR      0B     1  ERROR
2022-07-28 08:04:54  2022-07-28 08:05:00  FULL    37MB     1  OK

6. Delete backup

[[email protected] pg_rman]# /usr/pgsql-13/bin/pg_rman  --backup-path /lys/data/pg_rman  --pgdata /var/lib/pgsql/13/data delete "2022-07-28 08:05:51"
INFO: delete the backup with start time: "2022-07-28 08:05:51"
WARNING: cannot delete backup with start time "2022-07-28 08:04:54"
DETAIL: This is the latest full backup necessary for successful recovery.
[[email protected] pg_rman]# /usr/pgsql-13/bin/pg_rman  --backup-path /lys/data/pg_rman  --pgdata /var/lib/pgsql/13/data  show
=====================================================================
 StartTime           EndTime              Mode    Size   TLI  Status
=====================================================================
2022-07-28 08:08:05  2022-07-28 08:08:10  INCR    24kB     1  OK
2022-07-28 08:04:54  2022-07-28 08:05:00  FULL    37MB     1  OK