14.04 升级到 16.04.1 后 Postgresql 服务器不启动

Question

刚刚从 14.04 升级了我的系统。LTS 到 16.04.1 LTS，postgresql 不在 systemd 上启动：

/etc/init.d/postgresql start                                                                                                                                                                              
[ ok ] Starting postgresql (via systemctl): postgresql.service

# /etc/init.d/postgresql status                                                                                                                                                                             
? postgresql.service - PostgreSQL RDBMS
  Loaded: loaded (/lib/systemd/system/postgresql.service; enabled; vendor     preset: enabled)
  Active: active (exited) since ?? 2016-08-09 13:40:51 MSK; 3min 23s ago
  Process: 23142 ExecStart=/bin/true (code=exited, status=0/SUCCESS)
  Main PID: 23142 (code=exited, status=0/SUCCESS)Seems that 

似乎 systemd 脚本包含错误的数据：

# cat /lib/systemd/system/postgresql.service                                                                                                                                                                
# systemd service for managing all PostgreSQL clusters on the system. This
# service is actually a systemd target, but we are using a service since
# targets cannot be reloaded.

[Unit]
Description=PostgreSQL RDBMS

[Service]
Type=oneshot
ExecStart=/bin/true
ExecReload=/bin/true
RemainAfterExit=on

[Install]
WantedBy=multi-user.target

postgresql 的正确脚本应该是什么？

Answer 1

Systemd 应该使用来自/etc/init.d. 相反，systemd 使用某种模板文件。要解决这个问题，请按照以下步骤操作：

1. 删除无效的服务脚本：

   # rm /lib/systemd/system/postgresql.service

2. 重新加载守护程序脚本：

   # systemctl daemon-reload

3. 启用 postgresql 服务：

   # systemctl enable postgresql

在这之后，你将能够与任何优选的变化开始的Postgres： sudo systemctl start postgresql，sudo service postgresql start或sudo /etc/init.d/postgresql start。要检查 postgresql 实际运行，请检查服务的状态：sudo systemctl status postgresql。它看起来像：

% sudo systemctl status postgresql                                                                                                                                                                          
? postgresql.service - LSB: PostgreSQL RDBMS server
   Loaded: loaded (/etc/init.d/postgresql; bad; vendor preset: enabled)
   Active: active (running) since ?? 2016-08-12 10:13:43 MSK; 1h 37min ago
     Docs: man:systemd-sysv-generator(8)
   CGroup: /system.slice/postgresql.service
           ??4086 /usr/lib/postgresql/9.5/bin/postgres -D     /var/lib/postgresql/9.5/main -c  config_file=/etc/postgresql/9.5/main/postgresql.conf
           ??4099 postgres: checkpointer process                                                                                              
           ??4100 postgres: writer process                                                                                                    
           ??4101 postgres: wal writer process                                                                                                
           ??4102 postgres: autovacuum launcher process                                                                                       
           ??4103 postgres: stats collector process                                                                                           

??? 12 10:13:40 ubuntu-precise systemd[1]: Starting LSB: PostgreSQL RDBMS server...
??? 12 10:13:40 ubuntu-precise postgresql[4009]:  * Starting PostgreSQL 9.5 database server
??? 12 10:13:43 ubuntu-precise postgresql[4009]:    ...done.
??? 12 10:13:43 ubuntu-precise systemd[1]: Started LSB: PostgreSQL RDBMS server.

Answer 2

如果您提供正确的版本和集群名称，这应该是开箱即用的。

假设您正在运行版本9.5并且集群被称为main：

开始： systemctl start postgresql@9.5-main

停止： systemctl stop postgresql@9.5-main

地位： systemctl status postgresql@9.5-main

在启动时启用自动启动： systemctl enable postgresql@9.5-main

在启动时禁用自动启动： systemctl disable postgresql@9.5-main

foo@postgres:~$ systemctl status postgresql@9.5-main
?  postgresql@9.5-main.service - PostgreSQL Cluster 9.5-main
   Loaded: loaded (/lib/systemd/system/postgresql@.service; disabled; vendor preset: enabled)
   Active: active (running) since Fri 2017-03-31 17:44:46 CEST; 59s ago
   Main PID: 4546 (postgres)
   CGroup: /system.slice/system-postgresql.slice/postgresql@9.5-main.service
           ? ? 4546 /usr/lib/postgresql/9.5/bin/postgres -D /var/lib/postgresql/9.5/main -c config_file=/etc/postgresql/9.5/main/postgresql.conf
           ? ? 4548 postgres: checkpointer process
           ? ? 4549 postgres: writer process
           ? ? 4550 postgres: wal writer process
           ? ? 4551 postgres: autovacuum launcher process
           ? ? 4552 postgres: stats collector process

Mar 31 17:44:44 postgres postgres[4546]: [1-2] 2017-03-31 17:44:44 CEST [4546] @ HINT:  Future log output will go to log destination "syslog".
Mar 31 17:44:44 postgres postgres[4547]: [2-1] 2017-03-31 17:44:44 CEST [4547] @ LOG:  database system was shut down at 2017-03-31 17:44:43 CEST
Mar 31 17:44:44 postgres postgres[4547]: [3-1] 2017-03-31 17:44:44 CEST [4547] @ LOG:  MultiXact member wraparound protections are now enabled
Mar 31 17:44:44 postgres postgres[4546]: [2-1] 2017-03-31 17:44:44 CEST [4546] @ LOG:  database system is ready to accept connections
Mar 31 17:44:44 postgres postgres[4551]: [2-1] 2017-03-31 17:44:44 CEST [4551] @ LOG:  autovacuum launcher started
Mar 31 17:44:45 postgres postgres[4553]: [3-1] 2017-03-31 17:44:45 CEST [4553] [unknown]@[unknown] LOG:  incomplete startup packet
Mar 31 17:44:46 postgres systemd[1]: Started PostgreSQL Cluster 9.5-main.
Mar 31 17:44:47 postgres systemd[1]: Reloading PostgreSQL Cluster 9.5-main.
Mar 31 17:44:47 postgres postgres[4546]: [3-1] 2017-03-31 17:44:47 CEST [4546] @ LOG:  received SIGHUP, reloading configuration files
Mar 31 17:44:47 systemd[1]: Reloaded PostgreSQL Cluster 9.5-main.