In some scenarios, you may need to configure hosts for an Elastic Container Instance-based pod. For example, when you pull an image from a self-managed image repository, you must specify the actual IP address of the image repository by using the hosts file. This topic describes how to configure hosts for an Elastic Container Instance-based pod by modifying the /etc/hosts file.
Configuration description
You can use the k8s.aliyun.com/eci-custom-hosts annotation to configure hosts for a pod. You can specify multiple mappings between IP addresses and domain names. The format of a mapping is {\"host\":\"example.com\",\"ip\":\"100.100.XX.XX\"}.
Annotations must be added to the metadata in the configuration file of the pod. For example, when you create a Deployment, you must add annotations in the spec.template.metadata section.
To use features of Elastic Container Instance, you can add annotations only when you create Elastic Container Instance-based pods. If you add or modify annotations when you update pods, these annotations do not take effect.
Configuration example
For example, you must specify the actual IP address of the image repository by using the hosts file when you pull images from a self-managed image repository. YAML file of the hosts:
apiVersion: apps/v1
kind: Deployment
metadata:
name: test
labels:
app: test
spec:
replicas: 1
selector:
matchLabels:
app: test
template:
metadata:
name: test
labels:
app: test
alibabacloud.com/eci: "true"
annotations:
k8s.aliyun.com/eci-custom-hosts: "[{\"host\":\"example.com\",\"ip\":\"100.100.XX.XX\"},{\"host\":\"aliyundoc.com\",\"ip\":\"100.100.XX.XX\"}]"
spec:
containers:
- name: nginx
image: example.com/test/nginx:latest
ports:
- containerPort: 80
- name: busybox
image: aliyundoc.com/test/busybox:1.30
command: ["sleep"]
args: ["999999"]