I launched a jenkins-k8s-slave which should pull from a local registry. Why does docker ignore the local DNS settings (/etc/hosts and /etc/resolv.conf) managed by kubernetes?
When I do:
docker pull service.namespace.svc.cluster.local:5000/test:latest
I get: dial tcp: lookup service.namespace.svc.cluster.local: no such host
but this works:
curl https://service.namespace.svc.cluster.local:5000/v2/_catalog -k {"repositories":[...]}
You will need to configure docker to use your dns , whatever that may be , in this case , it seems that you need to tell docker to use the kubernetes dns:
https://github.com/moby/moby/issues/23910
Example config:
cat /etc/docker/daemon.json
{
"hosts": [ "unix:///var/run/docker.sock","tcp://0.0.0.0:2376"],
"live-restore": true,
"tls": true,
"tlscacert": "/etc/docker/ssl/ca.pem",
"tlscert": "/etc/docker/ssl/cert.pem",
"tlskey": "/etc/docker/ssl/key.pem",
"tlsverify": true,
"dns":["172.21.1.100","172.16.1.100"]
}