Mongodb 安裝錯誤彙總

1. Failed to restart mongod.service: Unit mongod.service not found.

解決方法：

Most probably unit mongodb.service is masked. Use following command to unmask it.

sudo systemctl unmask mongodb

and re-run

sudo service mongod start

 

 1 vagrant@homestead:~$ sudo service mongod restart
 2 Failed to restart mongod.service: Unit mongod.service not found.
 3 vagrant@homestead:~$ ^C
 4 vagrant@homestead:~$ sudo systemctl unmask mongodb
 5 Removed symlink /etc/systemd/system/mongodb.service.
 6 vagrant@homestead:~$ sudo service mongod start
 7 vagrant@homestead:~$ sudo service mongod status
 8 ● mongod.service - MongoDB Database Server
 9    Loaded: loaded (/lib/systemd/system/mongod.service; disabled; vendor preset: enabled)
10    Active: active (running) since Thu 2018-10-25 03:50:52 UTC; 5s ago
11      Docs: https://docs.mongodb.org/manual
12  Main PID: 6669 (mongod)
13     Tasks: 19
14    Memory: 37.9M
15       CPU: 85ms
16    CGroup: /system.slice/mongod.service
17            └─6669 /usr/bin/mongod --config /etc/mongod.conf
18 
19 Oct 25 03:50:52 homestead systemd[1]: Started MongoDB Database Server.
20 Oct 25 03:50:52 homestead mongod[6669]: 2018-10-25T03:50:52.045+0000 I CONTROL  [main] Automatically disabling TLS 1.0, to force-enable TLS 1.0 spe
21 lines 1-13/13 (END)

 

相關知識點：

屏蔽和取消屏蔽單位

咱們的服務管理部分如何中止或禁用服務所看到的，但systemd還具備自動或手動標記機做爲徹底沒法啓動，經過其連接到的能力/dev/null 。 這就是所謂的掩蔽單元，而且可能用mask命令：

sudo systemctl mask nginx.service

這將防止Nginx服務自動或手動啓動，只要它被屏蔽。

若是選中list-unit-files ，你會看到該服務現已被列爲蒙面：

systemctl list-unit-files

. . . kmod-static-nodes.service static ldconfig.service static mandb.service static messagebus.service static nginx.service masked quotaon.service static rc-local.service static rdisc.service disabled rescue.service static . . .

若是您嘗試啓動服務，您將看到以下所示的消息：

sudo systemctl start nginx.service

Failed to start nginx.service: Unit nginx.service is masked.

要再次揭露一個單元，使其能夠使用，只要使用unmask命令：

sudo systemctl unmask nginx.service

這將使單元返回到先前的狀態，容許它被啓動或啓用。