Hello, I will explain how to install postgresql 12 on Centos 7. And how to create postgresql database is explained below.
—————-postgresql single instace installations————————-
repo package
#yum install centos-release-scl-rh
# yum install llvm-toolset-7-clang
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# yum install -y epel-release
# yum install llvm5.0-devel
**********************postgresql software installations**********************************
yum install -y https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x86_64/pgdg-redhat-repo-latest.noarch.rpm
yum install -y postgresql12-server postgresql12-client postgresql12-contrib postgresql12-devel
mkdir /postgres/data
chown postgres:postgres /postgres/data
passwd postgres
postgres
postgres
******************************************************************************
su – postgres
vi .bash_profile
# Get the aliases and functions
if [ -f ~/.bashrc ]; then
. ~/.bashrc
fi
# User specific environment and startup programs
PATH=$PATH:$HOME/.local/bin:$HOME/bin:$PATH:/usr/pgsql-12/bin/
export PGDATA=/postgres/data
export PGUSER=postgres
export PGDATABASE=postgres
export PGPORT=5432
export PGLOCALDIR=/usr/pgsql-12/share/locale
export PATH
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initdb -D /postgres/data
pg_ctl status
pg_ctl stop
pg_ctl start
# DB Version: 12
# OS Type: linux
# DB Type: web
# Total Memory (RAM): 32 GB
# CPUs num: 4
# Connections num: 500
# Data Storage: hdd
listen_addresses = ‘*’
port = 5432
max_connections = 500
shared_buffers = 8GB
effective_cache_size = 24GB
maintenance_work_mem = 2GB
checkpoint_completion_target = 0.7
wal_buffers = 16MB
default_statistics_target = 100
random_page_cost = 4
effective_io_concurrency = 2
work_mem = 8388kB
min_wal_size = 1GB
max_wal_size = 4GB
max_worker_processes = 4
max_parallel_workers_per_gather = 2
max_parallel_workers = 4
max_parallel_maintenance_workers = 2
pg_ctl restart
/postgres/data/pg_hba.conf
host all all **************** md5
host all all **************** md5
host all all **************** md5
pg_ctl reload
psql
CREATE DATABASE tayfun ENCODING=’UTF-8′ LC_COLLATE = ‘tr_TR.UTF-8′ LC_CTYPE=’tr_TR.UTF-8’ TEMPLATE template0;
CREATE ROLE testuser PASSWORD ‘testuser123!’ SUPERUSER CREATEDB CREATEROLE INHERIT LOGIN;
grant connect on database tayfun to testuser with grant option;
alter database tayfun owner to testuser ;