Kubernetes Troubleshooting Kodekloud

 


Question: One of the Nautilus DevOps team members was working on to update an existing Kubernetes template. Somehow, he made some mistakes in the template and it is failing while applying. We need to fix this as soon as possible, so take a look into it and make sure you are able to apply it without any issues. Also, do not remove any component from the template like pods/deployments/volumes etc.

/home/thor/mysql_deployment.yml is the template that needs to be fixed.

Note: The kubectl utility on jump_host has been configured to work with the kubernetes cluster.


Solution:

At first check pods, services,and secrets. Then apply the mentioned yml file. You will get the errors.

 Then edit the mentioned yml file.

vi  mysql_deployment.yml 

There are some wrong apiVersion name, wrong indentation, typos etc.

Fix those and apply. I have attached the correct yml here.

kubectl apply -f  mysql_deployment.yml

apiVersion: v1
kind: PersistentVolume
metadata:
name: mysql-pv
labels:
type: local
spec:
storageClassName: standard
capacity:
storage: 250Mi
accessModes:
- ReadWriteOnce
hostPath:
path: "/mnt/data"
persistentVolumeReclaimPolicy: Retain
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: mysql-pv-claim
labels:
app: mysql-app
spec:
storageClassName: standard
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 250Mi
---
apiVersion: v1
kind: Service
metadata:
name: mysql
labels:
app: mysql-app
spec:
type: NodePort
ports:
- targetPort: 3306
port: 3306
nodePort: 30011
selector:
app: mysql-app
tier: mysql
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: mysql-deployment
labels:
app: mysql-app
spec:
selector:
matchLabels:
app: mysql-app
tier: mysql
strategy :
type: Recreate
template:
metadata:
labels:
app: mysql-app
tier: mysql
spec:
containers:
- image: mysql:5.6
name: mysql
env:
- name: MYSQL_ROOT_PASSWORD
valueFrom:
secretKeyRef:
name: mysql-root-pass
key: password
- name: MYSQL_DATABASE
valueFrom:
secretKeyRef:
name: mysql-db-url
key: database
- name: MYSQL_USER
valueFrom:
secretKeyRef:
name: mysql-user-pass
key: username
- name: MYSQL_PASSWORD
valueFrom:
secretKeyRef:
name: mysql-user-pass
key: password
ports:
- containerPort: 3306
name: mysql
volumeMounts:
- name: mysql-persistent-storage
mountPath: /var/lib/mysql
volumes:
- name: mysql-persistent-storage
persistentVolumeClaim:
claimName: mysql-pv-claim

 





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About Ashadullah Shawon

I am Ashadullah Shawon. I am a Software Engineer. I studied Computer Science and Engineering (CSE) at RUET. I Like To Share Knowledge. Learn More: Click Here
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