kubernetes存储-configmap

目录

一、字面值创建

二、通过文件创建

三、通过目录创建

四、通过yaml文件创建

五、使用configmap设置环境变量

六、使用conigmap设置命令行参数

七、通过数据卷使用configmap

八、configmap热更新

      在Kubernetes中，ConfigMap是一种存储配置数据的对象。它允许将配置数据分离出来，以便在不改变应用程序容器镜像的情况下进行修改。ConfigMap可以存储以键值对形式表示的配置数据，比如环境变量、命令行参数、配置文件等。

一、字面值创建

kubectl create configmap my-config --from-literal=key1=config1 --from-literal=key2=config2
kubectl get cm
kubectl describe cm my-config

二、通过文件创建

kubectl create configmap my-config-2 --from-file=/etc/resolv.conf

kubectl describe cm my-config-2

三、通过目录创建

mkdir test
cp /etc/passwd test/
cp /etc/fstab  test/
ls test/
kubectl create configmap my-config-3 --from-file=test
kubectl describe cm my-config-3

四、通过yaml文件创建

vim cm1.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: cm1-config
data:
  db_host: "172.25.0.250"
  db_port: "3306"

kubectl apply -f cm1.yaml
kubectl describe cm cm1-config

五、使用configmap设置环境变量

vim pod1.yaml

apiVersion: v1
kind: Pod
metadata:
  name: pod1
spec:
  containers:
    - name: pod1
      image: busybox
      command: ["/bin/sh", "-c", "env"]
      env:
        - name: key1
          valueFrom:
            configMapKeyRef:
              name: cm1-config
              key: db_host
        - name: key2
          valueFrom:
            configMapKeyRef:
              name: cm1-config
              key: db_port
  restartPolicy: Never

kubectl apply -f pod1.yaml
kubectl logs pod1
kubectl delete  pod pod1

vim pod2.yaml

apiVersion: v1
kind: Pod
metadata:
  name: pod2
spec:
  containers:
    - name: pod2
      image: busybox
      command: ["/bin/sh", "-c", "env"]
      envFrom:
        - configMapRef:
            name: cm1-config
  restartPolicy: Never

kubectl apply -f pod2.yaml
kubectl logs pod2
kubectl delete  pod pod2

六、使用conigmap设置命令行参数

vim pod3.yaml

apiVersion: v1
kind: Pod
metadata:
  name: pod3
spec:
  containers:
    - name: pod3
      image: busybox
      command: ["/bin/sh", "-c", "echo $(db_host) $(db_port)"]
      envFrom:
        - configMapRef:
            name: cm1-config
  restartPolicy: Never

kubectl apply -f pod3.yaml
kubectl logs  pod3
kubectl delete  pod pod3

七、通过数据卷使用configmap

vim pod4.yaml

apiVersion: v1
kind: Pod
metadata:
  name: pod4
spec:
  containers:
    - name: pod4
      image: busybox
      command: ["/bin/sh", "-c", "cat /config/db_host"]
      volumeMounts:
      - name: config-volume
        mountPath: /config
  volumes:
    - name: config-volume
      configMap:
        name: cm1-config
  restartPolicy: Never

kubectl apply -f pod4.yaml
kubectl logs  pod4
kubectl delete pod pod4

八、configmap热更新

vim nginx.conf

server {
    listen       8000;
    server_name  _;

    location / {
        root /usr/share/nginx/html;
        index  index.html index.htm;
    }
}

kubectl create configmap nginxconf --from-file=nginx.conf
kubectl describe cm nginxconf

vim my-nginx.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-nginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
        - name: nginx
          image: nginx
          volumeMounts:
          - name: config-volume
            mountPath: /etc/nginx/conf.d
      volumes:
        - name: config-volume
          configMap:
            name: nginxconf

kubectl apply -f my-nginx.yaml
kubectl get pod -o wide

kubectl exec my-nginx-85fb986977-mqtl9 -- cat /etc/nginx/conf.d/nginx.conf
curl 10.244.109.75:8000

kubectl edit  cm nginxconf

kubectl delete  pod my-nginx-85fb986977-mqtl9
kubectl get pod -o wide

kubectl patch deployments.apps my-nginx --patch '{"spec": {"template": {"metadata": {"annotations": {"version/config": "20230312"}}}}}'

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