0.目的

下载MongoDB并安装，设置密码访问。
MongoDB官网会下载以下三个安装包
mongodb-org-server-4.2.2-1.el6.x86_64.rpm #MongoDB的服务，配置文件，启动脚本
mongodb-org-shell-4.2.2-1.el6.x86_64.rpm #包含mongo操作相关的shell命令
mongodb-org-tools-4.2.2-1.el6.x86_64.rpm #对MongoDB进行备份，分析的工具集

1.安装server

# rpm -ivh mongodb-org-server-4.2.2-1.el6.x86_64.rpm
# /etc/init.d/mongod start
starting mongod:           [OK]

2.安装命令行用来登录mongodb

# rpm -ivh mongodb-org-shell-4.2.2-1.el6.x86_64.rpm
# mongo
> show dbs;
admin   0.000GB
config  0.000GB
local   0.000GB

3.设置MongoDB的管理员密码

> use admin
switched to db admin
> db.createUser({ user: "admin", pwd: "test123", roles: [{ role: "userAdminAnyDatabase", db: "admin" }] })
Successfully added user: {
    "user" : "admin_root",
    "roles" : [
        {
            "role" : "userAdminAnyDatabase",
            "db" : "admin"
        }
    ]
}
##验证登录，如果返回1，则证明密码生效
> db.auth("admin", "test123") 
1

4.创建一个db库test，并分配账号和密码****

#登录管理员
> use admin
> db.auth("admin","test123")
#创建test库
> use test
> db.createUser({ user: "test", pwd: "test123", roles: [{ role: "dbOwner", db: "test" }] })
Successfully added user: {
    "user" : "test",
    "roles" : [
        {
            "role" : "dbOwner",
            "db" : "test"
        }
    ]
}

#程序调用以下链接即可：mongodb://test:test123@localhost/test

运维中无法启动的一些故障

1.服务restart后，会出现无法开启的问题，查找日志如下

# /etc/init.d/mongod start
starting mongod:           [FAILED]

# tail -f /var/log/mongdb/mongod.log
2019-12-25T10:43:44.336+0800 I  CONTROL  [initandlisten]     distarch: x86_64
2019-12-25T10:43:44.336+0800 I  CONTROL  [initandlisten]     target_arch: x86_64
2019-12-25T10:43:44.336+0800 I  CONTROL  [initandlisten] options: { config: "/etc/mongod.conf", net: { bindIp: "127.0.0.1", port: 27017 }, processManagement: { fork: true, pidFilePath: "/var/run/mongodb/mongod.pid", timeZoneInfo: "/usr/share/zoneinfo" }, storage: { dbPath: "/var/lib/mongo", journal: { enabled: true } }, systemLog: { destination: "file", logAppend: true, path: "/var/log/mongodb/mongod.log" } }
2019-12-25T10:43:44.336+0800 E  NETWORK  [initandlisten] Failed to unlink socket file /tmp/mongodb-27017.sock Operation not permitted
2019-12-25T10:43:44.336+0800 F  -        [initandlisten] Fatal Assertion 40486 at src/mongo/transport/transport_layer_asio.cpp 693
2019-12-25T10:43:44.336+0800 F  -        [initandlisten] 

***aborting after fassert() failure

解决方法：

# rm -fr /tmp/mongodb-27017.sock
# /etc/init.d/mongod start
starting mongod:           [OK]