Adding entries to Pod /etc/hosts with HostAliases

To add host to /etc/hosts file inside the container, you can define the hosts aliases inside your deployment yaml file.

For example like the following yaml file:

1
apiVersion : apps/v1
2
kind: Deployment
3
metadata:
4
    name: "backend-cluster"
5
spec:
6
    replicas: 1
7
    selector:
8
    matchLabels:
9
        app: "backend"
10
    template:
11
    metadata:
12
        labels:
13
        app: "backend"
14
    spec:
15
        containers:
16
        - name: "backend"
17
        image: "exampleregistry.gcr.io/backend"
18
        ports:
19
        - containerPort: 80
20
        hostAliases:
21
        - hostnames:
22
        - "www.example.com"
23
        ip: "10.0.2.4"

The important part is hostAliases:

1
...
2
        hostAliases:
3
        - hostnames:
4
        - "www.example.com"
5
        ip: "10.0.2.4"