mac docker login Error saving credentials

➜  ~ docker login 

WARNING! Using --password via the CLI is insecure. Use --password-stdin.
Error saving credentials: error storing credentials - err: exit status 1, out: `Post "http://ipc/registry/credstore-updated": dial unix /var/root/Library/Containers/com.docker.docker/Data/backend.sock: connect: no such file or directory`

解决方法：安装如下软件，然后再登录

brew install gnupg2 pass

➜  ~ docker login 
WARNING! Using --password via the CLI is insecure. Use --password-stdin.
Login Succeeded

Logging in with your password grants your terminal complete access to your account.
For better security, log in with a limited-privilege personal access token. Learn more at https://docs.docker.com/go/access-tokens/

GnuPG是GNU Privacy Guard的缩写,它是一个完全开源自由的OpenPGP标准(由RFC4880定义)实现。pass 是 Linux上的一个简单的命令行密码管理器，它将密码存储在一个gpg加密后的文件里。这些加密后的文件很好地组织按目录结构存放。
登录成功后会提示密钥凭证存储在如下位置， 可以进行配置关闭这个提示。
WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store

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