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。
