Docker SSL Error x509: certificate signed by unknown authority

 

x509: certificate signed by unknown authority

Above error is all about SSL/TLS handshake errors which is due to mismatch of root certificates, i have encountered this issue while running kubeadm command and later i found, issue exists with CURL and Docker Pull command too.

Thing to note : I'm using a PROXY server ( Zscaler ) , thus it's certificate must be imported within my linux base OS and thus into docker certificates too.

Curl Issue.

x509: certificate signed by unknown authority.

Fix :

Retrieve your own proxy certificate, mine is for zscaler hence using the below command and then refresh the trusts.

Syntax Template

 #  cp zscalar_root.crt /etc/pki/ca-trust/source/anchors/ && update-ca-trust

Docker Pull Issue.

x509: certificate signed by unknown authority.

Fix :

Retrieve your own proxy certificate, mine is for zscaler hence using the below command and then refresh the trusts

Syntax Template

 #  cp zscalar_root.crt /etc/docker/certs.d/tls/ && update-ca-trust

Now restart docker to reflect the changes within docker.

Restart docker

 
 #  systemctl restart docker