mongodb的安裝：

1.MongoDB 原始碼下載地址：https://www.mongodb.com/download-center#community

2.vim /etc/profile修改環境變數：末尾新增

export PATH=$PATH:/home/no4/mongodb/bin

3.source /etc/profile

避免每次都要使用source /etc/profile使環境變數檔案生效的方法：

    sudo su
    vim ~/.bashrc

末尾新增source /etc/profile

4.新建配置檔案mongod.conf

    systemLog:
        destination: file
        path: "/home/no4/mongodata/log/mongod.log"
        logAppend: true
    storage:
        dbPath: "/home/no4/mongodata/db"
        journal:
           enabled: true
    processManagement:
        fork: true
    net:
        bindIp: localhost
        port: 27017
 

5.在配置檔案所指定的位置建立對應的資料夾

6.mongod -f /home/no4/mongodb/mongod.conf命令啟動mongodb伺服器，正常輸出如下：

    root@no4-Default-string:/home/no4# mongod -f ./mongodb/mongod.conf
    about to fork child process, waiting until server is ready for connections.
    forked process: 11330
    child process started successfully, parent exiting
 

如果是這樣：

    root@no4-Default-string:/home/no4# mongod -f ./mongodb/mongod.conf
    about to fork child process, waiting until server is ready for connections.
    forked process: 11306
    ERROR: child process failed, exited with 48
    To see additional information in this output, start without the "--fork" option.
 

一般是因為之前已經啟動過了mongodb，使用ps -ef|grep mongod查詢mongod相關程序，然後殺掉後再重試。

7.輸入mongo連線伺服器，再輸入show dbs檢視資料庫，正常輸出如下：

    > show dbs
    admin   0.000GB
    config  0.000GB
    local   0.000GB

原文連結：https://blog.csdn.net/wangzhidi/article/details/114261049