Centos7 MongoDB安装

基础配置（Centos7.5镜像，2核2GB内存，50GB硬盘）

（在MongoDB官网有linux安装MongoDB的步骤）

（1）配置yum源

[root@mongodb ~]# cat /etc/yum.repos.d/mongodb.repo 
[mongodb-org-7.0]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/7.0/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-7.0.asc

（2）安装MongoDB包

（默认安装MongoDB最新版本（7.0.1））
[root@mongodb ~]# yum install -y mongodb-org
（如果需要安装指定版本，需要单独指定每个组件包，并在包名后附加版本号）
yum install -y mongodb-org-7.0.1 mongodb-org-database-7.0.1 mongodb-org-server-7.0.1 mongodb-mongosh-7.0.1 mongodb-org-mongos-7.0.1 mongodb-org-tools-7.0.1

（3）启动MongoDB服务

[root@mongodb ~]# systemctl start mongod

（4）查看MongoDB服务状态

（它这里有个报错先忽略掉，应该不影响后续的操作）（因为它只是一个提示信息，表明该环境变量被设置为false。通常情况下，这个环境变量不会影响MongoDB的运行）
[root@mongodb ~]# systemctl status mongod
● mongod.service - MongoDB Database Server
 ? Loaded: loaded (/usr/lib/systemd/system/mongod.service; enabled; vendor preset: disabled)
 ? Active: active (running) since 五 2023-09-15 16:14:11 CST; 57s ago
 ? ? Docs: https://docs.mongodb.org/manual
 Main PID: 11031 (mongod)
 ? CGroup: /system.slice/mongod.service
 ? ? ? ? ? └─11031 /usr/bin/mongod -f /etc/mongod.conf
?
9月 15 16:14:11 mongodb systemd[1]: Started MongoDB Database Server.
9月 15 16:14:11 mongodb systemd[1]: Starting MongoDB Database Server...
9月 15 16:14:11 mongodb mongod[11031]: {"t":{"$date":"2023-09-15T08:14:11.618Z"},"s":"I",  "c":"CONTROL",  "id":7484500, "ctx":"main","msg":"Environment variable MONGODB_CO..." to false"}
Hint: Some lines were ellipsized, use -l to show in full.

（5）看看能否正常进入数据库

（成功进入mongodb数据库，安装成功！）

[root@mongodb ~]# mongosh
Current Mongosh Log ID: 6504226fe792ed88c3dd64f6
Connecting to: ? ? ? ?  mongodb://127.0.0.1:27017/?directConnection=true&serverSelectionTimeoutMS=2000&appName=mongosh+2.0.1
Using MongoDB: ? ? ? ?  7.0.1
Using Mongosh: ? ? ? ?  2.0.1
?
For mongosh info see: https://docs.mongodb.com/mongodb-shell/
?
?
To help improve our products, anonymous usage data is collected and sent to MongoDB periodically (https://www.mongodb.com/legal/privacy-policy).
You can opt-out by running the disableTelemetry() command.
?
------
 ? The server generated these startup warnings when booting
 ? 2023-09-15T17:21:51.287+08:00: Access control is not enabled for the database. Read and write access to data and configuration is unrestricted
 ? 2023-09-15T17:21:51.287+08:00: /sys/kernel/mm/transparent_hugepage/enabled is 'always'. We suggest setting it to 'never'
 ? 2023-09-15T17:21:51.288+08:00: /sys/kernel/mm/transparent_hugepage/defrag is 'always'. We suggest setting it to 'never'
 ? 2023-09-15T17:21:51.288+08:00: vm.max_map_count is too low
------
?
?
Deprecation warnings:
  - Using mongosh on the current operating system is deprecated, and support may be removed in a future release.
See https://www.mongodb.com/docs/mongodb-shell/ for documentation on supported platforms.
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（6）目录路径了解一下

（默认目录如下）

• /var/lib/mongo(数据目录)

• /var/log/mongodb(日志目录）

（这个关于目录的，官网有介绍。如果修改了默认目录，官网也告诉了，去哪个配置文件修改什么参数，并且需要赋予修改目录所有者和所属组是mongod）