PostgreSQL starts with the system

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The document describe how to configure automatic start PostgreSQL when the system starts.

The ways suitable for  systemd  on CentOS 7.0 or latest release.

1.  Create and configure postgresql.service

# vim /usr/lib/systemd/system/postgresql.service

[Unit]  

    Description=PostgreSQL database server

    After=remote-fs.target nss-lookup.target  

    After=network.target sshd.service

    After=proc-fs-nfsd.mount

    After=network.target local-fs.target

    After=nfs-config.service

    After=nfs-mountd.service

    After=nfs-blkmap.service

    After=nfs-client.target

    After=nfs-config.service

    After=nfs-idmapd.service

    After=nfs-idmap.service

    After=nfs-lock.service

    After=nfslock.service

    After=nfs-mountd.service

    After=nfs-secure-server.service

    After=nfs-secure.service

    After=nfs.service

    After=nfs-utils.service

[Service]  

    Type=forking  

    User=postgres

    Group=appuser

    Environment=PGPORT=5432  

    Environment=PGDATA=/data/01/local/pgsql/data  

    ExecStart=/data/01/local/pgsql/bin/pg_ctl start -D ${PGDATA} -s -o "-p ${PGPORT}" -w -t 300  

    ExecStop=/data/01/local/pqsql/bin/pg_ctl stop -D ${PGDATA} -s -m fast  

    ExecReload=/data/01/local/pgsql/bin/pg_ctl reload -D ${PGDATA} -s  

    TimeoutSec=300  

[Install]  

    WantedBy=remote-fs.target

#chmod 644 /usr/lib/systemd/system/postgresql.service

2.  Reload systemd  and enable postgresql.service

#systemctl daemon-reload

#systemctl enable postgresql.service

Created symlink from /etc/systemd/system/multi-user.target.wants/postgresql.service to /usr/lib/systemd/system/postgresql.service.

#systemctl is-enabled postgresql.service

Enabled

#systemctl start postgresql.service

#systemctl status postgresql.service

● postgresql.service - PostgreSQL database server

   Loaded: loaded (/usr/lib/systemd/system/postgresql.service; enabled; vendor preset: disabled)

   Active: active (running) since Fri 2018-02-23 22:48:49 KST; 28min ago

Main PID: 2506 (postgres)

   CGroup: /system.slice/postgresql.service

           ├─2506 /data/01/local/pgsql/bin/postgres -D /data/01/local/pgsql/data -p 5432

           ├─2508 postgres: logger process   

           ├─2510 postgres: checkpointer process   

           ├─2511 postgres: writer process   

           ├─2512 postgres: wal writer process   

           ├─2513 postgres: autovacuum launcher process   

           └─2514 postgres: stats collector process   

Feb 23 22:48:47 ec5d-pbfcompilation-02 systemd[1]: Starting PostgreSQL database server...

Feb 23 22:48:48 ec5d-pbfcompilation-02 pg_ctl[1414]: < 2018-02-23 22:48:48.671 KST >LOG:  redirecting log output to logging collector process

Feb 23 22:48:48 ec5d-pbfcompilation-02 pg_ctl[1414]: < 2018-02-23 22:48:48.671 KST >HINT:  Future log output will appear in directory "pg_log".

Feb 23 22:48:49 ec5d-pbfcompilation-02 systemd[1]: Started PostgreSQL database server.

Note: CentOS7.x not support /etc/rc.local script file, Detailed description as following:

#cat /etc/rc.local

#!/bin/bash

# THIS FILE IS ADDED FOR COMPATIBILITY PURPOSES

#

# It is highly advisable to create own systemd services or udev rules

# to run scripts during boot instead of using this file.

#这是明智的在系统重启的时候，去创建一个systemd 服务或者udev规则去运行脚本，而不是用/etc/rc.local

#

# In contrast to previous versions due to parallel execution during boot

# this script will NOT be run after all other services.

#与先前的系统版本相比较，在系统启动的时候，由于服务是并行运行的，所以在其他服务启动之后，/etc/rc.local不会运行

#

# Please note that you must run 'chmod +x /etc/rc.d/rc.local' to ensure

# that this script will be executed during boot.

虽然这里说可以使用chmod  +x /etc/rc.local 去执行这个脚本，但是笔者在这个文件中添加一行：su - postgres -c ‘pg_ctl start -D /usr/local/pgsql/data’

然后reboot测试了多次，postgres最后都没有随系统启动成功,所以不再推荐(官方也不推荐了)使用/etc/rc.local文件的方式启动postgres,启动其他服务也一样，最好配置一个systemd服务。

本文题目：Centos7.x配置PostgreSQL自启动
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