**1. 首先创建一个ConfigMap** ```yaml apiVersion: v1 kind: ConfigMap metadata: name: log-config namespace: default data: log_level: INFO --- apiVersion: extensions/v1beta1 kind: Deployment metadata: name: my-nginx spec: replicas: 1 template: metadata: labels: run: my-nginx spec: containers: - name: my-nginx image: hub.atguigu.com/library/myapp:v1 ports: - containerPort: 80 volumeMounts: - name: config-volume mountPath: /etc/config volumes: - name: config-volume configMap: name: log-config ``` **2. 查看设置的ConfigMap** ```shell $ kubectl exec 'kubectl get pods -l run=my-nginx -o=name|cut -d "/" -f2' cat /etc/config/log_level INFO ``` **3. 修改 ConfigMap** ```shell $ kubectl edit configmap log-config ``` 修改 log_level 的值为 DEBUG 等待大概 10 秒钟时间，再次查看环境变量的值。 ```shell $ kubectl exec 'kubectl get pods -l run=my-nginx -o=name|cut -d "/" -f2' cat /tmp/log_level DEBUG ```