Mac启动mongo的问题

Mac启动mongo的问题

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题主在Mac上启用mongodb遇到很多麻烦，查阅了很多资料，终于把问题解决了，在这里整理一下，分享一下。

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1. Question1：Error while upgrading Mongodb from 3.2 to 3.6
   在安装mongodb 4.X 版本前要先升级到3.6
   Solution：
   - 先卸载mongodb
   - 再一个版本一个版本的安装

Uninstall your current mongodb

brew uninstall mongodb
Install mongodb 3.2 version

brew install mongodb@3.2
Start mongod 3.2 version (when you install the old version like above, you need the full path to run it.)

/usr/local/opt/mongodb@3.2/bin/mongod
Start mongo 3.2 version

/usr/local/opt/mongodb@3.2/bin/mongo
Run the important command

> db.adminCommand( { setFeatureCompatibilityVersion: "3.2" } )
Quit

>quit();
Terminate the mongod

Find PID of mongod process using $ top

Kill the process by $ kill <PID> (the Mongo docs have more info on this)
Uninstall mongodb 3.2

brew uninstall mongodb@3.2
Repeat the above steps for 3.4

Install mongodb 3.4 version

brew install mongodb@3.4
Start mongod 3.4 version

/usr/local/opt/mongodb@3.4/bin/mongod
Start mongo 3.4 version

/usr/local/opt/mongodb@3.4/bin/mongo
Run the important command

> db.adminCommand( { setFeatureCompatibilityVersion: "3.4" } )
...

Repeat the above steps for mongodb 3.6

...

Last, after uninstall 3.6, then you can install the most current version, 4.x, you don't have to specify the @4.x etc., just

Install the most current version

brew install mongodb

2. Question2:Error: File exists @ dir_s_mkdir - /Users/Library/LaunchAgents
   Solution:rm ~/Library/LaunchAgents