tls: failed to verify certificate: x509: certificate signed by unknown authority [closed]

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after pulling docker from dockerhub
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tls: failed to verify certificate: x509: certificate signed by unknown authority

reinstall ca certificate

  • The error means what it says; the host you connected to is signed by a certificate that isn’t ultimately signed by something in your CA store. This could be because your OS is out-of-date and is missing CA store updates. Or it could be because someone at your ISP is running a MITM attack against you and substituting a fake dockerhub server, hoping you’ll just turn on insecure mode and trust an untrustworthy server to give you code to run.

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