安装mongodb的时候报错，

Error: No available formula with the name "mongodb" 
==> Searching for a previously deleted formula (in the last month)...
Warning: homebrew/core is shallow clone. To get complete history run:
  git -C "$(brew --repo homebrew/core)" fetch --unshallow

Error: No previously deleted formula found.
==> Searching for similarly named formulae...
Error: No similarly named formulae found.
==> Searching taps...
==> Searching taps on GitHub...
Warning: Error searching on GitHub: curl failed!   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (7) Failed to connect to api.github.com port 443: Connection refused

Error: No formulae found in taps

后来发现好像是闭源了，操作流程见下边的连接，
https://github.com/mongodb/homebrew-brew
设定: brew install mongodb-community@4.2
启动：$ brew services start mongodb-community