自建 MongoDB 实践：MongoDB 的安装及基本使用

[root@mongo01 ~]# cat /etc/redhat-release
CentOS Linux release 7.9.2009 (Core)

[root@mongo01 ~]# echo "never" > /sys/kernel/mm/transparent_hugepage/enabled
[root@mongo01 ~]# echo "never" > /sys/kernel/mm/transparent_hugepage/defrag

[root@mongo01 ~]# cat >> /etc/rc.d/rc.local <<EOF
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
EOF

[root@mongo01 ~]# chmod +x /etc/rc.d/rc.local 

[root@mongo01 ~]# ls -l /etc/rc.d/rc.local
-rwxr-xr-x. 1 root root 725 Jul 29 02:32 /etc/rc.d/rc.local

(venv36) [root@mongo01 ~]# cat >> /etc/yum.repos.d/mongodb-org-4.4.repo <<"EOF"
[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
EOF

(venv36) [root@mongo01 ~]# yum install -y mongodb-org

[root@mongo01 ~]# rpm -qa |grep mongod
mongodb-org-server-4.4.15-1.el7.x86_64
mongodb-org-mongos-4.4.15-1.el7.x86_64
mongodb-org-shell-4.4.15-1.el7.x86_64
mongodb-org-database-tools-extra-4.4.15-1.el7.x86_64
mongodb-org-tools-4.4.15-1.el7.x86_64
mongodb-database-tools-100.5.4-1.x86_64
mongodb-org-4.4.15-1.el7.x86_64

(venv36) [root@mongo01 ~]# systemctl start mongod

(venv36) [root@mongo01 ~]# systemctl status mongod
● mongod.service - MongoDB Database Server
   Loaded: loaded (/usr/lib/systemd/system/mongod.service; enabled; vendor preset: disabled)
   Active: active (running) since Fri 2022-07-29 02:09:03 UTC; 3s ago
     Docs: https://docs.mongodb.org/manual
  Process: 3716 ExecStart=/usr/bin/mongod $OPTIONS (code=exited, status=0/SUCCESS)
  Process: 3713 ExecStartPre=/usr/bin/chmod 0755 /var/run/mongodb (code=exited, status=0/SUCCESS)
  Process: 3710 ExecStartPre=/usr/bin/chown mongod:mongod /var/run/mongodb (code=exited, status=0/SUCCESS)
  Process: 3708 ExecStartPre=/usr/bin/mkdir -p /var/run/mongodb (code=exited, status=0/SUCCESS)
 Main PID: 3720 (mongod)
   CGroup: /system.slice/mongod.service
           └─3720 /usr/bin/mongod -f /etc/mongod.conf

Jul 29 02:09:03 mongo01.tyun.cn systemd[1]: Starting MongoDB Database Server...
Jul 29 02:09:03 mongo01.tyun.cn mongod[3716]: about to fork child process, waiting until server is ready for connections.
Jul 29 02:09:03 mongo01.tyun.cn mongod[3716]: forked process: 3720
Jul 29 02:09:03 mongo01.tyun.cn mongod[3716]: child process started successfully, parent exiting
Jul 29 02:09:03 mongo01.tyun.cn systemd[1]: Started MongoDB Database Server.

(venv36) [root@mongo01 ~]# ps -ef |grep mongo |grep -v grep
mongod    3720     1  1 02:09 ?        00:00:00 /usr/bin/mongod -f /etc/mongod.conf

[root@mongo01 ~]# mongo
MongoDB shell version v4.4.15
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("50f98507-a80d-4e23-84a2-321718a2132d") }
MongoDB server version: 4.4.15
---
The server generated these startup warnings when booting: 
        2022-07-29T02:35:51.390+00:00: Using the XFS filesystem is strongly recommended with the WiredTiger storage engine. See http://dochub.mongodb.org/core/prodnotes-filesystem
        2022-07-29T02:35:52.346+00:00: Access control is not enabled for the database. Read and write access to data and configuration is unrestricted
---
---
        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()
---
> show dbs
admin   0.000GB
config  0.000GB
local   0.000GB

> exit
bye

> use admin

> db.createUser(
  {
    user: "tyun",
    pwd: passwordPrompt(),
    roles: [
      { role: "userAdminAnyDatabase", db: "admin" },
      { role: "readWriteAnyDatabase", db: "admin" }
    ]
  }
)

Enter password:

> use admin

> db.createUser(
  {
    user: "tyun",
    pwd: passwordPrompt(),
    roles: [
      { role: "userAdminAnyDatabase", db: "admin" },
      { role: "readWriteAnyDatabase", db: "admin" }
    ]
  }
)

Enter password:

> use admin
switched to db admin

> db.createUser({user: "root", pwd: passwordPrompt(), roles: [{role: "root", db: "admin" }]})
Enter password: 
Successfully added user: {
 "user" : "root",
 "roles" : [
  {
   "role" : "root",
   "db" : "admin"
  }
 ]
}

security:
  authorization: enabled

[root@mongo01 ~]# systemctl restart mongod

[root@mongo01 ~]# mongo --authenticationDatabase "admin" -u "tyun" -p
MongoDB shell version v4.4.15
Enter password: 在此处输入密码
connecting to: mongodb://127.0.0.1:27017/?authSource=admin&compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("00dbddb9-43c4-4ce1-92cd-3ff38cccec44") }
MongoDB server version: 4.4.15
> show dbs
admin   0.000GB
config  0.000GB
local   0.000GB

> exit
bye