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Install Postgresql 12.8 on RHEL 7 and Cent OS

Install Postgresql 12.8 on RHEL 7:

Download following rpm packages from - https://download.postgresql.org/pub/repos/yum/12/redhat/rhel-7-x86_64/

postgresql12-libs-12.8-1PGDG.rhel7.x86_64.rpm
postgresql12-12.8-1PGDG.rhel7.x86_64.rpm
postgresql12-server-12.8-1PGDG.rhel7.x86_64.rpm
postgresql12-contrib-12.8-1PGDG.rhel7.x86_64

Install rpm packages for Postgresql:

# yum install postgresql12-libs-12.8-1PGDG.rhel7.x86_64.rpm
# yum install postgresql12-12.8-1PGDG.rhel7.x86_64.rpm
# yum install postgresql12-server-12.8-1PGDG.rhel7.x86_64.rpm
# yum install postgresql12-contrib-12.8-1PGDG.rhel7.x86_64

It will install following utilities at /usr/pg-sql12/bin

clusterdb   dropuser           pg_basebackup  pg_controldata  pg_isready      pg_restore     pg_test_timing  postgresql-12-check-db-dir  reindexdb createdb    initdb             pgbench        pg_ctl          pg_receivewal   pg_rewind      pg_upgrade      postgresql-12-setup         vacuumdb
createuser  oid2name   pg_checksums   pg_dump         pg_recvlogical  pg_standby     pg_waldump      postmaster   vacuumlo dropdb      pg_archivecleanup  pg_config      pg_dumpall      pg_resetwal     pg_test_fsync  postgres        psql

Initialize postgresql:

# postgresql-12-setup initdb
Initializing database ... OK

Enable postgresql:
# systemctl enable postgresql-12.service

# Start Postgresql service:

systemctl start postgresql-12.service

Set password for user postgres:
$ sudo su - postgres

$ psql

postgres=# alter user postgres with password 'postgres';

ALTER ROLE

Connect using psql:
$ psql
psql (12.8)
Type "help" for help.
    
Processes for Postgresql:

# ps -ef | grep postgres
postgres 12161     1  0 13:04 ?        00:00:00 /usr/pgsql-12/bin/postmaster -D /mysql/postgresql/
postgres 12163 12161  0 13:04 ?        00:00:00 postgres: logger
postgres 12165 12161  0 13:04 ?        00:00:00 postgres: checkpointer
postgres 12166 12161  0 13:04 ?        00:00:00 postgres: background writer
postgres 12167 12161  0 13:04 ?        00:00:00 postgres: walwriter
postgres 12168 12161  0 13:04 ?        00:00:00 postgres: autovacuum launcher
postgres 12169 12161  0 13:04 ?        00:00:00 postgres: stats collector
postgres 12170 12161  0 13:04 ?        00:00:00 postgres: logical replication launcher
postgres 12404 12403  0 13:06 pts/0    00:00:00 -bash
postgres 12435 12404  0 13:06 pts/0    00:00:00 psql
postgres 12436 12161  0 13:06 ?        00:00:00 postgres: postgres postgres [local] idle
postgres 13104 12161  0 13:11 ?        00:00:03 postgres: postgres postgres 10.225.109.174(55594) idle
postgres 13106 12161  0 13:11 ?        00:00:04 postgres: postgres test 10.225.109.174(62426) idle

Explore: 

https://www.postgresql.org/docs/12/creating-cluster.html
https://blog.crunchydata.com/blog/postgresql-installing-and-creating-cluster-with-rpm-packages
https://sysadminxpert.com/install-postgresql-12-on-centos-7-or-rhel-7/

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