Moving from Docker to K8s, today we run some containers with: docker run --hostname %H ... that causes the container to get the Host machine hostname as its own, can I have similar behavior running under K8s? (having the pod hostname as the Node hostname)
From what I have seen so far:
spec.hostname seems not to support values from env vars.
Using hostAliases seems to put a hardcoded name...
BTW, the pods are deployed as a DeamonSet
If you use hostNetwork: true for pod's spec, it will share the network with the node. Here is a simple test:
apiVersion: v1
kind: Pod
metadata:
name: test-pod
spec:
hostNetwork: true
containers:
- name: test-container
image: k8s.gcr.io/busybox
command: [ "sh", "-c"]
args:
- while true; do
echo -en '\n';
printenv HOSTNAME
sleep 10;
done;
restartPolicy: NeverThat shows that the pod's host name is the same as its node.
Note though that this setup is general not recommended:
Avoid using
hostNetwork, for the same reasons ashostPort
However, maybe in your case that's not an issue.