本文的主线 引入 => 命令 => 文件
引入
- 回顾
Pod解决了容器的”超亲密关系”设计
Deployment解决了Pod水平扩展的问题
Service解决了Deployment对外访问的问题
Ingress解决了Service负载均衡的问题
- ConfigMap解决了容器镜像和环境配置解耦的问题
命令
kubectl create configmap config-from-literal --from-literal=hello=world
kubectl get configmap config-from-literal -o yaml
vim pod.yml
apiVersion: v1
kind: Pod
metadata:
name: config-test1
spec:
containers:
- name: config-test1-container
image: registry.cn-hangzhou.aliyuncs.com/google_containers/busybox
command: [ "/bin/sh", "-c", "env" ]
env:
- name: ENV_HELLO
valueFrom:
configMapKeyRef:
name: config-from-literal
key: hello
restartPolicy: Never
kubectl apply -f pod.yml
kubectl get pods
# NAME READY STATUS RESTARTS AGE
# config-test1 0/1 Completed 0 17h
kubectl logs config-test1 | grep ENV_HELLO
# ENV_HELLO=world
文件
vim index.html
<!DOCTYPE html>
<head>
<meta charset="UTF-8">
<title>hello world</title>
</head>
<body>
ConfigMap
</body>
kubectl create configmap config-from-file --from-file=index.html
kubectl describe configmap config-from-file
vim deploy.yml
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deploy
labels:
app: nginx
spec:
replicas: 3
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.20.1
ports:
- containerPort: 80
volumeMounts:
- mountPath: "/usr/share/nginx/html"
name: html-volume
volumes:
- name: html-volume
configMap:
name: config-from-file
kubectl apply -f deploy.yml
kubectl get pods
# NAME READY STATUS RESTARTS AGE
# nginx-deploy-65f94fdb78-78hjk 1/1 Running 0 4s
# nginx-deploy-65f94fdb78-hnbx5 1/1 Running 0 4s
# nginx-deploy-65f94fdb78-k4vlf 1/1 Running 0 4s
kubectl exec -it nginx-deploy-65f94fdb78-78hjk -- /bin/bash
cat /usr/share/nginx/html/index.html
vim service.yml
apiVersion: v1
kind: Service
metadata:
name: nginx-service
spec:
selector:
app: nginx
ports:
- protocol: TCP
port: 80
targetPort: 80
type: NodePort
kubectl apply -f service.yml
kubectl get svc
# NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
# nginx-service NodePort 10.99.50.129 <none> 80:31289/TCP 3s
curl http://172.10.66.201:31289/
<!DOCTYPE html>
<head>
<meta charset="UTF-8">
<title>hello world</title>
</head>
<body>
ConfigMap
</body>
