docker - could not read CA certificate

 
Docker ENV issue

I face docker ca issue while I try to set docker env. If you try to setup DOCKER_TLS_VERIFY or DOCKER_CERT_PATH and something wrong. May you can run docker even remove and re-install the docker. Below error message will display
 
could not read CA certificate

could not read CA certificate "/root/.docker/ca.pem": open /root/.docker/ca.pem: no such file or directory

The issue can fix by

unset ${!DOCKER*}

Reference

• https://docs.docker.com/machine/reference/env/