Centos8安装MongoDB 4.2

参考文档:linuxconfig.org

安装过程

1 下载安装包到/opt,并解压缩,创建文件夹的软链接

cd /opt 
wget -O mongodb-linux-x86_64-rhel80-4.2.3.tgz https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel80-4.2.3.tgz
tar -zxvf mongodb-linux-x86_64-rhel80-4.2.3.tgz  
ln -s mongodb-linux-x86_64-rhel80-4.2.3 mongodb

2 创建相关的用户和文件夹

useradd mongod
mkdir -p /var/lib/mongo
chown -R mongod:mongod /opt/mongodb*
chown -R mongod: /var/lib/mongo

3 创建配置文件、systemd服务、配置环境变量

创建配置文件

vim /etc/mongod.conf
#内容如下
storage:
  dbPath: "/var/lib/mongo"
  journal:
    enabled: true

net:
  port: 27017
  bindIp: "127.0.0.1"

创建systemd服务

vim /etc/systemd/system/mongod.service
#内容如下
[Unit]
Description=MongoDB
After=syslog.target network.target

[Service]
Type=simple

User=mongod
Group=mongod

ExecStart=/opt/mongodb/bin/mongod --config /etc/mongod.conf

[Install]
WantedBy=multi-user.target

配置环境变量

vim /etc/profile.d/mongodb.sh
#内容如下
## mongodb
PATH=$PATH:/opt/mongodb/bin

4 启动MongoDB服务

systemctl daemon-reload
systemctl start mongod
systemctl status mongod

5 进入mongo交互终端

# 使环境变量生效
. /etc/profile.d/mongodb.sh
mongo

显示内容如下:

MongoDB shell version v4.2.3
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("04c11ecc-5ae4-4f8f-a81b-bb2c2595126d") }
MongoDB server version: 4.2.3
Server has startup warnings: 
2020-02-11T16:02:25.696+0800 I  CONTROL  [initandlisten] 
2020-02-11T16:02:25.696+0800 I  CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2020-02-11T16:02:25.696+0800 I  CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2020-02-11T16:02:25.696+0800 I  CONTROL  [initandlisten] 
2020-02-11T16:02:25.696+0800 I  CONTROL  [initandlisten] 
2020-02-11T16:02:25.696+0800 I  CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2020-02-11T16:02:25.696+0800 I  CONTROL  [initandlisten] **        We suggest setting it to 'never'
2020-02-11T16:02:25.696+0800 I  CONTROL  [initandlisten] 
---
Enable MongoDB's free cloud-based monitoring service, which will then receive and display
metrics about your deployment (disk utilization, CPU, operation statistics, etc).

The monitoring data will be available on a MongoDB website with a unique URL accessible to you
and anyone you share the URL with. MongoDB may use this information to make product
improvements and to suggest MongoDB products and deployment options to you.

To enable free monitoring, run the following command: db.enableFreeMonitoring()
To permanently disable this reminder, run the following command: db.disableFreeMonitoring()
---

> db
test
> use test
switched to db test
> 

增加用户

使用mongo进入交互终端

use admin

db.createUser(
  {
    user: "superuser",
    pwd: "changeMeToAStrongPassword",
    roles: [ "root" ]
  }
)

show users

# {
#    "_id" : "admin.superuser",
#    "userId" : UUID("7c2aee5c-6af5-4e25-ae0f-4422c6a8a03c"),
#    "user" : "superuser",
#    "db" : "admin",
#    "roles" : [
#            {
#              "role" : "root",
#              "db" : "admin"
#            }
#    ],
#    "mechanisms" : [
#            "SCRAM-SHA-1",
#            "SCRAM-SHA-256"
#    ]
#  }

db.shutdownServer() #关闭
exit

开启用户认证

修改配置文件

vim /etc/mongod.conf

## 增加如下:
security:
  authorization: "enabled"

启动mongod

service mongod start

进入mongo交互终端

``` mongo -u superuser -p changeMeToAStrongPassword