doc: format yaml files

deploy/example/deployment.yaml

@@ -16,7 +16,7 @@ kind: Deployment
 metadata:
   name: deployment-nfs
 spec:
-  replicas: 3
+  replicas: 1
   selector:
     matchLabels:
       name: deployment-nfs
@@ -30,11 +30,11 @@ spec:
         "kubernetes.io/os": linux
       containers:
         - name: deployment-nfs
-        image: mcr.microsoft.com/oss/nginx/nginx:1.17.3-alpine
+          image: mcr.icrosoft.com/oss/nginx/nginx:1.19.5
           command:
-          - "/bin/sh"
+            - "/bin/bash"
             - "-c"
-          - while true; do echo $(hostname) $(date) >> /mnt/nfs/outfile; sleep 1; done
+            - set -euo pipefail; while true; do echo $(hostname) $(date) >> /mnt/nfs/outfile; sleep 1; done
           volumeMounts:
             - name: nfs
               mountPath: "/mnt/nfs"

deploy/example/statefulset.yaml

@@ -7,7 +7,7 @@ metadata:
     app: nginx
 spec:
   serviceName: statefulset-nfs
-  replicas: 3
+  replicas: 1
   template:
     metadata:
       labels:
@@ -17,11 +17,11 @@ spec:
         "kubernetes.io/os": linux
       containers:
         - name: statefulset-nfs
-          image: mcr.microsoft.com/oss/nginx/nginx:1.17.3-alpine
+          image: mcr.microsoft.com/oss/nginx/nginx:1.19.5
           command:
-            - "/bin/sh"
+            - "/bin/bash"
             - "-c"
-            - while true; do echo $(date) >> /mnt/nfs/outfile; sleep 1; done
+            - set -euo pipefail; while true; do echo $(date) >> /mnt/nfs/outfile; sleep 1; done
           volumeMounts:
             - name: persistent-storage
               mountPath: /mnt/nfs

hack/verify-yamllint.sh

@@ -29,7 +29,7 @@ if [[ "${deployDirNum}" != "${helmDirNum}" ]]; then
   exit 1
 fi
 
-for path in "deploy/*.yaml"
+for path in "deploy/*.yaml" "deploy/example/*.yaml" "deploy/example/nfs-provisioner/*.yaml"
 do
     echo "checking yamllint under path: $path ..."
     yamllint -f parsable $path | grep -v "line too long" > $LOG