Kubernetes:获取名称解析错误

Question

我正在将php和redis部署到一个本地minikube集群中，但是在与名称解析相关的错误下面。

Warning: Redis::connect(): php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution in /app/redis.php on line 4

Warning: Redis::connect(): connect() failed: php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution in /app/redis.php on line 4

Fatal error: Uncaught RedisException: Redis server went away in /app/redis.php:5 Stack trace: #0 /app/redis.php(5): Redis->ping() #1 {main} thrown in /app/redis.php on line 5

我正在使用以下配置文件：

apache-php.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: webserver
  labels:
    app: apache
spec:
  replicas: 1
  selector:
    matchLabels:
      app: apache
  template:
    metadata:
      labels:
        app: apache
    spec:
      containers:
      - name: php-apache
        image: webdevops/php-apache
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80
        volumeMounts:
        - name: app-code
          mountPath: /app
      volumes:
        - name: app-code
          hostPath:
            path: /minikubeMnt/src
---
apiVersion: v1
kind: Service
metadata:
  name: web-service
  labels:
    app: apache
spec:
  type: NodePort
  ports:
  - port: 80
    protocol: TCP
  selector:
    app: apache

redis.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: redis
  labels:
    app: redis
spec:
  replicas: 1
  selector:
    matchLabels:
      app: redis
  template:
    metadata:
      labels:
        app: redis
    spec:
      containers:
        - name: redis
          image: redis:5.0.4
          imagePullPolicy: IfNotPresent
          ports:
             - containerPort: 6379
---
apiVersion: v1
kind: Service
metadata:
  name: redis-service
spec:
  type: NodePort
  ports:
    - port: 6379
      targetPort: 6379
  selector:
    app: redis

我正在使用下面的PHP代码访问Redis，我已经将下面的代码挂载到apache部署中。

<?php
ini_set('display_errors', 1);
$redis = new Redis();
$redis->connect("redis-service", 6379);
echo "Server is running: ".$redis->ping();

服务的群集仪表板视图如下：

​

​

提前谢谢。

当我运行env命令时，获取与redis相关的值，当我使用IP:10.104.115.148访问redis时，它就正常工作了。

REDIS_SERVICE_PORT=tcp://10.104.115.148:6379
REDIS_SERVICE_PORT_6379_TCP=tcp://10.104.115.148:6379
REDIS_SERVICE_SERVICE_PORT=6379
REDIS_SERVICE_PORT_6379_TCP_ADDR=10.104.115.148
REDIS_SERVICE_PORT_6379_TCP_PROTO=tcp```

Answer 1

考虑在这里使用K8S liveliness和readiness探测，以便从错误中自动恢复。您可以找到更多相关信息，这里。

您可以使用initContainer来检查redis服务器的可用性，使用bash while循环和break，然后让php启动。有关更多信息，请查看场景2 in 这里。

作为集群IP的Redis服务

apiVersion: v1
kind: Service
metadata:
  name: redis-service
spec:
  type: clusterIP
  ports:
    - port: 6379
      targetPort: 6379
  selector:
    app: redis