“docker pull” certificate signed by unknown authority

Question

I was trying to pull a docker image from a docker registry but hit the following issue:

$ docker pull //          


        

Answer 1

For anyone who is using CentOS 7, this is what worked for me:

• Obtain necessary certificate (e.g. from your company)
• Copy the certificate to ca-trust location:

sudo cp -p abc.crt /etc/pki/ca-trust/source

• Update the certificate:

sudo update-ca-trust extract

• Reload daemon and restart docker:

sudo systemctl daemon-reload
sudo systemctl restart docker