常用数据库的启动与关闭

电脑里安装了多种常用数据库，但是又不会经常都用到，所以没有设置开机启动，但是时间长了经常忘记启动命令，这里总结一下，以便忘记是随时查看。

一、mongoDB
1、首先开启mongo数据库服务，mongod，它需要一直在后台运行才可以保证数据库连接正常。

sudo service mongod start   # 开启

2、然后就可以在终端启动mongo了，也可以用可视化工具如Robo3T连接

➜  ~ sudo service mongod start
➜  ~ mongo
MongoDB shell version v3.4.18
connecting to: mongodb://127.0.0.1:27017
MongoDB server version: 3.4.18
Server has startup warnings: 
2018-12-04T18:02:44.177+0800 I STORAGE  [initandlisten] 
2018-12-04T18:02:44.177+0800 I STORAGE  [initandlisten] ** WARNING: Using the XFS filesystem is strongly recommended with the WiredTiger storage engine
2018-12-04T18:02:44.177+0800 I STORAGE  [initandlisten] **          See http://dochub.mongodb.org/core/prodnotes-filesystem
2018-12-04T18:02:44.993+0800 I CONTROL  [initandlisten] 
2018-12-04T18:02:44.993+0800 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2018-12-04T18:02:44.994+0800 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2018-12-04T18:02:44.994+0800 I CONTROL  [initandlisten] 
> 

3、不用的时候可以选择关闭mongo后台服务

sudo service mongod stop   # 关闭

二、MySQL

1、启动MySQL服务：

sudo service mysql start  #  方式一
sudo /etc/init.d/mysql start   # 方式二

启动后可以看看状态：

➜  init.d service mysql status
● mysql.service - MySQL Community Server
   Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: en
   Active: active (running) since 二 2018-12-04 13:55:17 CST; 4h 18min ago
  Process: 1112 ExecStartPost=/usr/share/mysql/mysql-systemd-start post (code=ex
  Process: 1096 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exit
 Main PID: 1111 (mysqld)
   CGroup: /system.slice/mysql.service
           └─1111 /usr/sbin/mysqld

12月 04 13:55:16 zzf-ubuntu systemd[1]: Starting MySQL Community Server...
12月 04 13:55:17 zzf-ubuntu systemd[1]: Started MySQL Community Server.

2、然后就可以连接MySQL数据库了，不管是终端、命令行、程序还是可视化工具

➜  ~ mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 7
Server version: 5.7.24-0ubuntu0.16.04.1 (Ubuntu)

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

mysql> ^DBye

3、关闭同mongo，改成stop即可

4、另外开启时候也可以重启，使用restart命令即可。

三、Redis

1、服务启动

　　通过指定配置文件启动，要清楚自己的配置文件位置

redis-server /etc/redis/redis.conf

2、然后就可以通过各种方式连接redis数据库了

➜  ~ redis-cli
127.0.0.1:6379> 

3、关闭Redis服务

redis-cli shutdown