1.更新yum

Centos 的安装工具，安装时间稍长

yum -y update

2.添加MongoDB源文件

在/etc/yum.repos.d 创建一个 mongodb-org.repo 文件

touch /etc/yum.repos.d/mongodb-org.repo

编辑mongodb-org.repo文件

vim /etc/yum.repos.d/mongodb-org.repo

添加文件内容(这里我使用的版本3.2)

[mongodb-org]
name=MongoDB Repository
baseurl=http://mirrors.aliyun.com/mongodb/yum/redhat/7Server/mongodb-org/3.2/x86_64/
gpgcheck=0
enabled=1

3.安装Mongo

yum install -y mongodb-org

4.启动mongodb

service mongod start

我在这里报错了

出现这个错误：

Starting mongod (via systemctl):
Job for mongod.service failed because the control process exited with error code.
See “systemctl status mongod.service” and “journalctl -xe” for details.

解决办法：

将mongoDB添加到systemd

vim /usr/lib/systemd/system/mongod.service

[Unit]
Description=mongodb database

[Service]
User=mongod
Group=mongod
Environment="OPTIONS=--quiet -f /etc/mongod.conf"
ExecStart=/usr/bin/mongod $OPTIONS run
PIDFile=/var/run/mongodb/mongod.pid

[Install]
WantedBy=multi-user.target

建立链接

ln -s /usr/lib/systemd/system/mongod.service /etc/systemd/system/multi-user.target.wants/

重新加载systemctl

systemctl daemon-reload

将mongoDB添加到systemd后错误变为：

Loaded: loaded (/usr/lib/systemd/system/mongod.service; enabled; vendor preset: disabled)

打印错误

systemctl status mongod.service

错误如下

mongod.service - SYSV: Mongo is a scalable, document-oriented database.
   Loaded: loaded (/etc/rc.d/init.d/mongod; bad; vendor preset: disabled)
   Active: failed (Result: exit-code) since 五 2021-03-26 15:05:55 CST; 5min ago
     Docs: man:systemd-sysv-generator(8)
  Process: 50458 ExecStart=/etc/rc.d/init.d/mongod start (code=exited, status=1/FAILURE)

3月 26 15:05:55 localhost.localdomain systemd[1]: Starting SYSV: Mongo is a scalable, document-oriented database....
3月 26 15:05:55 localhost.localdomain mongod[50458]: Error starting mongod. /var/run/mongodb/mongod.pid exists.
3月 26 15:05:55 localhost.localdomain systemd[1]: mongod.service: control process exited, code=exited status=1
3月 26 15:05:55 localhost.localdomain systemd[1]: Failed to start SYSV: Mongo is a scalable, document-oriented database..
3月 26 15:05:55 localhost.localdomain systemd[1]: Unit mongod.service entered failed state.
3月 26 15:05:55 localhost.localdomain systemd[1]: mongod.service failed.

这时候试着去看一下mongo的log

tail -f /var/log/mongodb/mongod.log

出现这个错误

......
2021-03-26T14:58:31.238+0800 E NETWORK  [initandlisten] Failed to unlink socket file /tmp/mongodb-27017.sock errno:1 Operation not permitted
......

查看一下/tmp/mongodb-27017.sock的读写权限

ls -l /tmp/mongodb-27017.sock

结果是文件权限是root

srwx------ 1 root root 0 3月  26 14:42 /tmp/mongodb-27017.sock

把所有者修改为mongod

chown mongod:mongod /tmp/mongodb-27017.sock

重新启动mongo

service mongod start

现在启动就成功了

5.设置开机启动

chkconfig mongod on

6。配置远程访问

修改mongod.conf配置文件

vim/etc/mongod.conf

7.重启mongod

service mongod restart