tls: failed to verify certificate: x509: certificate is valid for <DOMAIN>, not console.redhat.com about okd

[codespearhead]

Nice!

Can you close this issue then?

[codespearhead]

The log says:

[tls] certificate is valid for *.apps.oc.domain.tld, *.oc.domain.tld, oc.domain.tld, not login.domain.tld

So you have to generate a new SSL certificate that includes login.domain.tld

[CamZie]

@codespearhead thanks for the tip. However "login.domain.tld" is the URL of our SSO. This is running on an external server with its own Let's Encrypt certificate.

I think this issue is most probably an issue with how the domain is being resolved, because we are getting the following errors in the DNS:

dns-default-9x8qn       linux/amd64, go1.20.12 X:strictfipsruntime, 
dns-default-9x8qn       [INFO] 10.128.0.100:39274 - 64042 "A IN login.domain.tld.oc.domain.tld. udp 63 false 1232" - - 0 6.002317855s
dns-default-9x8qn       [ERROR] plugin/errors: 2 login.domain.tld.oc.domain.tld. A: read udp 10.128.0.39:46929->9.9.9.9:53: i/o timeout
dns-default-9x8qn       [INFO] 10.128.0.121:32824 - 32981 "A IN infogw.api.openshift.com.oc.domain.tld. udp 74 false 1232" - - 0 6.001218683s
dns-default-9x8qn       [ERROR] plugin/errors: 2 infogw.api.openshift.com.oc.domain.tld. A: read udp 10.128.0.39:39464->9.9.9.9:53: i/o timeout
dns-default-9x8qn       [INFO] 10.128.0.47:53644 - 40718 "A IN api.oc.domain.tld. udp 53 false 1232" - - 0 6.002321304s
dns-default-9x8qn       [ERROR] plugin/errors: 2 api.oc.domain.tld. A: read udp 10.128.0.39:38144->9.9.9.9:53: i/o timeout

Somehow whenever it checks an external FQDN for .e.g infogw.api.openshift.com / login.domain.tld it checks the following instead infogw.api.openshift.com.oc.domain.tld / login.domain.tld.oc.domain.tld which is always appending the base domain of our cluster at the end.

[codespearhead]

Show us what base domain is set in your cluster.

1. Log into the cluster:

oc login --server=<your-cluster-api-url> -u <username> -p <password>

2. Output its base domain:

oc get ingresses.config.openshift.io cluster -o jsonpath='{.spec.domain}'

[CamZie]

This is the output of the command. The domain.tld is used to replace the real domain.

$ oc get ingresses.config.openshift.io cluster -o jsonpath='{.spec.domain}'

apps.oc.domain.tld

[CamZie]

I managed to find out the cause. It looks like the /etc/resolv.conf of the host has the search parameter configured, which is the reason why the base domain of the cluster is always appending on every DNS queries on the cluster.

# Generated by NetworkManager
###search  oc.domain.tld
nameserver .....

I removed this parameter and it works.