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Configuring Redis sử dụng Config map

Hải Yến Trịnh's photo
Hải Yến Trịnh
·

2 min read

Tạo configMap configuration block:

cat <<EOF >./example-redis-config.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: example-redis-config
data:
  redis-config: ""
EOF

Apply config map và redis:

kubectl apply -f example-redis-config.yaml
kubectl apply -f https://raw.githubusercontent.com/kubernetes/website/main/content/en/examples/pods/config/redis-pod.yaml

pods/config/redis-pod.yaml

apiVersion: v1
kind: Pod
metadata:
  name: redis
spec:
  containers:
  - name: redis
    image: redis:5.0.4
    command:
      - redis-server
      - "/redis-master/redis.conf"
    env:
    - name: MASTER
      value: "true"
    ports:
    - containerPort: 6379
    resources:
      limits:
        cpu: "0.1"
    volumeMounts:
    - mountPath: /redis-master-data
      name: data
    - mountPath: /redis-master
      name: config
  volumes:
    - name: data
      emptyDir: {}
    - name: config
      configMap:
        name: example-redis-config
        items:
        - key: redis-config
          path: redis.conf

Kiểm tra:

kubectl get pod/redis configmap/example-redis-config 
kubectl describe configmap/example-redis-config

Dùng kubectl exec để exec vào trong pod và chạy redis-cli :

kubectl exec -it redis -- redis-cli
127.0.0.1:6379> CONFIG GET maxmemory
127.0.0.1:6379> CONFIG GET maxmemory-policy

Thêm vào config khác vào example-redis-config ConfigMap:

pods/config/example-redis-config.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: example-redis-config
data:
  redis-config: |
    maxmemory 2mb
    maxmemory-policy allkeys-lru

Update configmap:

kubectl apply -f example-redis-config.yaml
kubectl describe configmap/example-redis-config
kubectl exec -it redis -- redis-cli
127.0.0.1:6379> CONFIG GET maxmemory
127.0.0.1:6379> CONFIG GET maxmemory-polic

Delete và tạo lại pod:

kubectl delete pod redis
kubectl apply -f https://raw.githubusercontent.com/kubernetes/website/main/content/en/examples/pods/config/redis-pod.yaml

Kiểm tra lại:

kubectl exec -it redis -- redis-cli
127.0.0.1:6379> CONFIG GET maxmemory
127.0.0.1:6379> CONFIG GET maxmemory-policy

Clean up:

kubectl delete pod/redis configmap/example-redis-config
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