Question : We deployed a Nginx and PHPFPM based setup on Kubernetes cluster last week and it had been working fine. This morning one of the team members made a change somewhere which caused some issues, and it stopped working. Please look into the issue and fix it:
The pod name is nginx-phpfpm and configmap name is nginx-config. Figure out the issue and fix the same.
Once issue is fixed, copy /home/thor/index.php file from jump host into nginx-container under nginx document root and you should be able to access the website using Website button on top bar.
Note: The kubectl utility on jump_host has been configured to work with the kubernetes cluster.
1. Check existing running pods
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thor@jump_host
~$ kubectl get pods NAME READY STATUS
RESTARTS AGE nginx-phpfpm 2/2
Running 0 3m4s thor@jump_host
~$ |
2. check the shared volume path in existing config map
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thor@jump_host
~$ kubectl get configmap NAME DATA AGE kube-root-ca.crt 1
42m nginx-config 1
5m51s thor@jump_host
~$ thor@jump_host
~$ kubectl describe configmap nginx-config Name: nginx-config Namespace: default Labels: <none> Annotations: <none>
Data ==== nginx.conf: ---- events { } http { server { listen 8099 default_server; listen [::]:8099 default_server;
# Set nginx to serve files from the
shared volume! root /var/www/html; index
index.html index.htm index.php; server_name _; location / { try_files $uri $uri/ =404; } location ~ \.php$ { include fastcgi_params; fastcgi_param REQUEST_METHOD
$request_method; fastcgi_param SCRIPT_FILENAME
$document_root$fastcgi_script_name; fastcgi_pass 127.0.0.1:9000; } } } Events: <none> thor@jump_host
~$ |
3. Get the configuration in the YAML file from the running pod
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thor@jump_host ~$ kubectl get
pod nginx-phpfpm -o yaml >
/tmp/nginx.yaml thor@jump_host ~$ ll /tmp/ total 12 -rwx------ 1 root root 836
Aug 1
2019 ks-script-rnBCJB -rw-rw-r-- 1 thor thor 6866 Aug 13 15:21 nginx.yaml -rw------- 1 root root 0
Aug 1
2019 yum.log thor@jump_host ~$ thor@jump_host
~$ cat /tmp/nginx.yaml apiVersion: v1 kind: Pod metadata: annotations:
kubectl.kubernetes.io/last-applied-configuration: |
{"apiVersion":"v1","kind":"Pod","metadata":{"annotations":{},"labels":{"app":"php-app"},"name":"nginx-phpfpm","namespace":"default"},"spec":{"containers":[{"image":"php:7.2-fpm","name":"php-fpm-container","volumeMounts":[{"mountPath":"/var/www/html","name":"shared-files"}]},{"image":"nginx:latest","name":"nginx-container","volumeMounts":[{"mountPath":"/usr/share/nginx/html","name":"shared-files"},{"mountPath":"/etc/nginx/nginx.conf","name":"nginx-config-volume","subPath":"nginx.conf"}]}],"volumes":[{"emptyDir":{},"name":"shared-files"},{"configMap":{"name":"nginx-config"},"name":"nginx-config-volume"}]}} creationTimestamp:
"2021-08-13T15:17:18Z" labels: app: php-app managedFields: - apiVersion: v1 fieldsType: FieldsV1 fieldsV1: f:metadata: f:annotations: .: {}
f:kubectl.kubernetes.io/last-applied-configuration: {} f:labels: .: {} f:app: {} f:spec: f:containers:
k:{"name":"nginx-container"}: .: {} f:image: {} f:imagePullPolicy: {} f:name: {} f:resources: {} f:terminationMessagePath: {} f:terminationMessagePolicy: {} f:volumeMounts: .: {}
k:{"mountPath":"/etc/nginx/nginx.conf"}: .: {} f:mountPath: {} f:name: {} f:subPath: {}
k:{"mountPath":"/usr/share/nginx/html"}: .: {} f:mountPath: {} f:name: {}
k:{"name":"php-fpm-container"}: .: {} f:image: {} f:imagePullPolicy: {} f:name: {} f:resources: {} f:terminationMessagePath: {} f:terminationMessagePolicy: {} f:volumeMounts: .: {}
k:{"mountPath":"/var/www/html"}: .: {} f:mountPath: {} f:name: {} f:dnsPolicy: {} f:enableServiceLinks: {} f:restartPolicy: {} f:schedulerName: {} f:securityContext: {} f:terminationGracePeriodSeconds: {} f:volumes: .: {}
k:{"name":"nginx-config-volume"}: .: {} f:configMap: .: {} f:defaultMode: {} f:name: {} f:name: {}
k:{"name":"shared-files"}: .: {} f:emptyDir: {} f:name: {} manager: kubectl-client-side-apply operation: Update time: "2021-08-13T15:17:18Z" - apiVersion: v1 fieldsType: FieldsV1 fieldsV1: f:status: f:conditions:
k:{"type":"ContainersReady"}: .: {} f:lastProbeTime: {} f:lastTransitionTime: {} f:status: {} f:type: {}
k:{"type":"Initialized"}: .: {} f:lastProbeTime: {} f:lastTransitionTime: {} f:status: {} f:type: {}
k:{"type":"Ready"}: .: {} f:lastProbeTime: {} f:lastTransitionTime: {} f:status: {} f:type: {} f:containerStatuses: {} f:hostIP: {} f:phase: {} f:podIP: {} f:podIPs: .: {}
k:{"ip":"10.244.0.5"}: .: {} f:ip: {} f:startTime: {} manager: kubelet operation: Update time: "2021-08-13T15:18:27Z" name: nginx-phpfpm namespace: default resourceVersion: "4384" uid: 8e516726-a04d-42f5-b4f2-431595e0046d spec: containers: - image: php:7.2-fpm imagePullPolicy: IfNotPresent name: php-fpm-container resources: {} terminationMessagePath:
/dev/termination-log terminationMessagePolicy: File volumeMounts: - mountPath: /var/www/html name: shared-files - mountPath: /var/run/secrets/kubernetes.io/serviceaccount name: default-token-zxqtx readOnly: true - image: nginx:latest imagePullPolicy: Always name: nginx-container resources: {} terminationMessagePath:
/dev/termination-log terminationMessagePolicy: File volumeMounts: - mountPath: /usr/share/nginx/html name: shared-files - mountPath: /etc/nginx/nginx.conf name: nginx-config-volume subPath: nginx.conf - mountPath:
/var/run/secrets/kubernetes.io/serviceaccount name: default-token-zxqtx readOnly: true dnsPolicy: ClusterFirst enableServiceLinks: true nodeName: kodekloud-control-plane preemptionPolicy: PreemptLowerPriority priority: 0 restartPolicy: Always schedulerName: default-scheduler securityContext: {} serviceAccount: default serviceAccountName: default terminationGracePeriodSeconds: 30 tolerations: - effect: NoExecute key: node.kubernetes.io/not-ready operator: Exists tolerationSeconds: 300 - effect: NoExecute key: node.kubernetes.io/unreachable operator: Exists tolerationSeconds: 300 volumes: - emptyDir: {} name: shared-files - configMap: defaultMode: 420 name: nginx-config name: nginx-config-volume - name: default-token-zxqtx secret: defaultMode: 420 secretName: default-token-zxqtx status: conditions: - lastProbeTime: null lastTransitionTime:
"2021-08-13T15:17:18Z" status: "True" type: Initialized - lastProbeTime: null lastTransitionTime:
"2021-08-13T15:18:27Z" status: "True" type: Ready - lastProbeTime: null lastTransitionTime:
"2021-08-13T15:18:27Z" status: "True" type: ContainersReady - lastProbeTime: null lastTransitionTime:
"2021-08-13T15:17:18Z" status: "True" type: PodScheduled containerStatuses: - containerID:
containerd://4a9f5b2152f51eb7f8f8a12734bbe982ec9c79f9472d034537986a542af425fe image: docker.io/library/nginx:latest imageID: docker.io/library/nginx@sha256:8f335768880da6baf72b70c701002b45f4932acae8d574dedfddaf967fc3ac90 lastState: {} name: nginx-container ready: true restartCount: 0 started: true state: running: startedAt:
"2021-08-13T15:18:27Z" - containerID:
containerd://1423c8170b38029767027ccaff9f66b882f0d50ebbe55ce187bcb0094f5e8c03 image: docker.io/library/php:7.2-fpm imageID:
docker.io/library/php@sha256:9c84ae47fddb97b94d1d2e289635b7306142a5336bc4ece0a393458c5e0d2cef lastState: {} name: php-fpm-container ready: true restartCount: 0 started: true state: running: startedAt:
"2021-08-13T15:18:09Z" hostIP: 172.17.0.2 phase: Running podIP: 10.244.0.5 podIPs: - ip: 10.244.0.5 qosClass: BestEffort startTime: "2021-08-13T15:17:18Z" thor@jump_host
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4. Edit the nginx.yaml file and changed ‘/usr/share/nginx/html’ to ‘/var/www/html’ in 3 places. ( Refer Below Video for Clarity )
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thor@jump_host
~$ cat /tmp/nginx.yaml |grep
/usr/share/nginx/html
{"apiVersion":"v1","kind":"Pod","metadata":{"annotations":{},"labels":{"app":"php-app"},"name":"nginx-phpfpm","namespace":"default"},"spec":{"containers":[{"image":"php:7.2-fpm","name":"php-fpm-container","volumeMounts":[{"mountPath":"/var/www/html","name":"shared-files"}]},{"image":"nginx:latest","name":"nginx-container","volumeMounts":[{"mountPath":"/usr/share/nginx/html","name":"shared-files"},{"mountPath":"/etc/nginx/nginx.conf","name":"nginx-config-volume","subPath":"nginx.conf"}]}],"volumes":[{"emptyDir":{},"name":"shared-files"},{"configMap":{"name":"nginx-config"},"name":"nginx-config-volume"}]}} k:{"mountPath":"/usr/share/nginx/html"}: - mountPath: /usr/share/nginx/html thor@jump_host
~$ |
5. Post changes the mount path run below command to replace the running pods
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thor@jump_host
~$ kubectl replace -f /tmp/nginx.yaml --force pod
"nginx-phpfpm" deleted pod/nginx-phpfpm
replaced thor@jump_host
~$ |
6. Wait for pods to get running status.
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thor@jump_host
~$ kubectl get pods NAME READY STATUS
RESTARTS AGE nginx-phpfpm 2/2
Running 0 7s thor@jump_host
~$ |
7. Now copy the index.php file as per the task.
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thor@jump_host
~$ kubectl exec -it nginx-phpfpm -c nginx-container -- curl -I
http://localhost:8099 HTTP/1.1 200 OK Server:
nginx/1.21.1 Date: Fri, 13
Aug 2021 16:01:17 GMT Content-Type:
text/html; charset=UTF-8 Connection:
keep-alive X-Powered-By:
PHP/7.2.34 thor@jump_host ~$ |
Happy Learning!!!!
Apart from this if you need more clarity, I have made a tutorial video on this , please go through and share your comments. Like and share the knowledge
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