Add support for domain name as advertise address about apiserver HOT 7 CLOSED

Setting ControlPlaneEndpoint does not fix the issue of changing the IP address. If I change the IP address, the API-server will not start. Even when setting ControlPlaneEndpoint

I second this. It is mandatory for me to specify IP address in "advertiseAddress", and when I put a hostname resolved by DNS in controlPlaneEndpoint in kubeadm, it still fails if IP address changes. Anything we can do?

from apiserver.

is it still true that apiserver advertise address must be IP? i'm curious that why it cannot be hostname? what difficulity will be face if use hostname?

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from apiserver.

Looks like this is being solved, at least partially, by the introduction of ControlPlaneEndpoint. kubernetes/kubernetes#59288

Even more work is being done to support HA masters here: kubernetes/kubernetes#58261

And the progress is being tracked here: kubernetes/kubeadm#261

from apiserver.

Setting ControlPlaneEndpoint does not fix the issue of changing the IP address. If I change the IP address, the API-server will not start. Even when setting ControlPlaneEndpoint

from apiserver.

This is an insane requirement. Such a parameter should just accept a hostname as well.

My current workaround is;

• decide a bogus IP (127.33.22.11) to be used in all nodes, use this for advertising
• manage an ipvs entry locally, to virtually map that ip to the changing target IP

FAKE_IP=127.33.22.11
REAL_IPS_OR_HOSTNAMES="127.0.0.1 $(dig +short api2)"
ipvsadm -A -t $FAKE_IP:6443
for ip in $REAL_IPS; do
  ipvsadm -a -t $FAKE_IP:6443 -r $ip:6443 -m
done

kube-apiserver \
  --advertise-address ${FAKE_IP} \
  ...

from apiserver.

Hmm 🤔

E1217 00:46:52.116565    5486 controller.go:227] unable to sync kubernetes service: Endpoints "kubernetes" is invalid: subsets[0].addresses[1].ip: Invalid value: "127.33.22.11": may not be in the loopback range (127.0.0.0/8, ::1/128)

.. better choose an IP address out of this range. the rule above doesn't say anything about multicast ranges.

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