Brew Install MongoDB. Permission Denied

　　

➜ models git:(master) brew install mongodb
==> Downloading https://homebrew.bintray.com/bottles/mongodb-3.0.7.el_capitan.bo
Already downloaded: /Library/Caches/Homebrew/mongodb-3.0.7.el_capitan.bottle.tar.gz
==> Pouring mongodb-3.0.7.el_capitan.bottle.tar.gz
Error: Permission denied - /usr/local/var

 

由于是权限的问题，以后brew又本身选择了进行git clone源码，而后编译，实际上是没有什么用的，由于/usr/local的权限是没有的。

 

解决办法：

brew update

 

Error: The /usr/local directory is not writable.
Even if this directory was writable when you installed Homebrew, other
software may change permissions on this directory. Some versions of the
"InstantOn" component of Airfoil are known to do this.

You should probably change the ownership and permissions of /usr/local
back to your user account.
sudo chown -R $(whoami):admin /usr/local

 

 因此只要 sudo chown -R $(whoami):admin /usr/local

就能够解决了