话题排版

1 .安装Mongodb

编辑Mongodb安装源

```
vi /etc/yum.repos.d/mongodb-org-4.4.repo
```

编辑内容如下：

```
[mongodb-org-4.4]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/4.4/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-4.4.asc
```

安装

```
yum install -y mongodb-org
```

2 .在启动前修改一些配置

2.1.（推荐）修改ulimit

```
 vi /etc/security/limits.conf
 ```

```
* soft nofile 65535
* hard nofile 65535
 ```
 
 ```
 vi /etc/profile
 ```
 
 ```
 ulimit -SHn 65535
 ```

2.2.（推荐）关闭transparent_hugepage

`vi /etc/rc.local`

```
if test -f /sys/kernel/mm/transparent_hugepage/enabled; then
  echo never > /sys/kernel/mm/transparent_hugepage/enabled
fi
if test -f /sys/kernel/mm/transparent_hugepage/defrag; then
  echo never > /sys/kernel/mm/transparent_hugepage/defrag
fi
```

3 . 修改mongodb配置文件

`vi /etc/mongod.conf`

```
systemLog:
  destination: file
  logAppend: true
  path: /var/log/mongodb/mongod.log

storage:
  dbPath: /var/lib/mongo
  journal:
    enabled: true

processManagement:
  fork: true
  pidFilePath: /var/run/mongodb/mongod.pid

net:
  port: 27017
  bindIp: 0.0.0.0

security:
  authorization: enabled
  javascriptEnabled: false
 ```
 
4 . 管理

启动 `mongod -f /etc/mongod.conf`

停止 `mongod -f /etc/mongod.conf --shutdown`

```
#新建管理员用户

mongo --port 21111
> use admin
> db.createUser({user:"admin",pwd:"123456",roles:[{role:"root",db:"admin"}]})
> db.auth("userAdmin","123456")
```

```
#新建普通用户

> use test
> db.createUser({user:"test",pwd:"123456",roles:[{role:"readWrite",db:"test"}]})
```

#删除安装的包

`yum erase $(rpm -qa | grep mongodb-org)`

```
删除数据及日志

rm -r /var/log/mongodb

rm -r /var/lib/mongo
```

`PS: 默认是使用 mongodb用户启动， 所以注意使用目录的权限`