Kubernetes: Getting name resolution error - kubernetes

Question

I am deploying php and redis to a local minikube cluster but getting below error related to name resolution.
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
I am using below configurations files:
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
And I am using the below PHP code to access Redis, I have mounted below code into the apache-php deployment.
<?php
ini_set('display_errors', 1);
$redis = new Redis();
$redis->connect("redis-service", 6379);
echo "Server is running: ".$redis->ping();
Cluster dashboard view for the services is given below:
Thanks in advance.
When I run env command getting below values related to redis and when I use the IP:10.104.115.148 to access redis then it is working fine.
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

Consider using K8S liveliness and readiness probes here, to automatically recover from errors. You can find more related information here.
And you can use an initContainer that check for availability of redis-server using bash while loop with break and then let php-apache to start. For more information, check Scenario 2 in here.
Redis Service as Cluster IP
apiVersion: v1
kind: Service
metadata:
name: redis-service
spec:
type: clusterIP
ports:
- port: 6379
targetPort: 6379
selector:
app: redis