Customize hosts record on docker and kubernetes

Docker:

docker run -it --rm --add-host=host1:172.17.0.2 --add-host=host2:192.168.1.3 busybox

use “–add-host” to add entries to /etc/hosts

 

Kubernetes:

apiVersion: v1
kind: Pod
metadata:
  name: hostaliases-pod
spec:
  hostAliases:
  - ip: "127.0.0.1"
    hostnames:
    - "foo.local"
    - "bar.local"
  - ip: "10.1.2.3"
    hostnames:
    - "foo.remote"
    - "bar.remote"
  containers:
  - name: cat-hosts
    image: busybox
    command:
    - cat
    args:
    - "/etc/hosts"

use “spec.hostAliases” to configure hosts entry for pod/deployment

 

https://kubernetes.io/docs/concepts/services-networking/add-entries-to-pod-etc-hosts-with-host-aliases/