I am in the phase of learning Kubernetes, trying to create a service and reach it via ping / curl.
Step1: Created a deployment mytomcat in default namespace
alias k='kubectl'
k create deployment mytomcat --image=tomcatStep2: Created a deployment busybox with curl in default namespace
apiVersion: v1
kind: Pod
metadata:
name: mybusybox
namespace: default
spec:
containers:
- image: yauritux/busybox-curl
command:
- sleep
- "3600"
imagePullPolicy: IfNotPresent
name: busybox
restartPolicy: Always
k apply -f busybox.yaml
k exec mybusybox -t -i -- shStep3: Ping the mytomcat pods and it works
ping 10.1.1.11
PING 10.1.1.11 (10.1.1.11): 56 data bytes
64 bytes from 10.1.1.11: seq=0 ttl=64 time=0.207 msStep4: Create a service to expose port 8080 on tomcat
k expose deployment mytomcat --port=8080 Step5: Get stats of all resources
k get all -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
pod/mybusybox 1/1 Running 0 10m 10.1.1.14 docker-desktop <none> <none>
pod/mytomcat-6bfbf4c889-xqkg9 1/1 Running 0 39m 10.1.1.11 docker-desktop <none> <none>
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
service/kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 42m <none>
service/mytomcat ClusterIP 10.102.120.90 <none> 8080/TCP 6m40s app=mytomcat
NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR
deployment.apps/mytomcat 1/1 1 1 39m tomcat tomcat app=mytomcat
NAME DESIRED CURRENT READY AGE CONTAINERS IMAGES SELECTOR
replicaset.apps/mytomcat-6bfbf4c889 1 1 1 39m tomcat tomcat app=mytomcat,pod-template-hash=6bfbf4c889Step7: curl the service to reach tomcat pod failed. Is this the expected output ? Cos it says Err code 404. I have no working idea of a tomcat server.
curl http://mytomcat:8080
<!doctype html><html lang="en"><head><title>HTTP Status 404 – Not Found</title><style type="text/css">body {font-family:Tahoma,Arial,sans-serif;} h1, h2, h3, b {color:white;background-color:#525D76;} h1 {font-size:22px;} h2 {font-size:16px;} h3 {font-size:14px;} p {font-size:12px;} a {color:black;} .line {height:1px;background-color:#525D76;border:none;}</style></head><body><h1>HTTP Status 404 – Not Found</h1><hr class="line" /><p><b>Type</b> Status Report</p><p><b>Description</b> The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.</p><hr class="line" /><h3>Apache Tomcat/9.0.37</h3></body></html>/homeCan anyone advise where am I doing it wrong or suggest good resources to learn in simple to begin with.
Thank you.
This not a DNS Unreachable issue or DNS issue at all. This is expected since you have not deployed a war file on the tomcat hence HTTP Status 404 – Not Found
Please refer to this question on how to deploy a war file on tomcat running in kubernetes. https://stackoverflow.com/questions/54341432/deploy-war-in-tomcat-on-kubernetes