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Pod

debug-network.yaml

---
apiVersion: v1
kind: Pod
metadata:
  name: debug-network-pod
spec:
  containers:
    - command:
        - sleep
        - "3600"
      image: praqma/network-multitool
      name: debug-network-container

dns-debug.yaml

---
# https://kubernetes.io/docs/tasks/administer-cluster/dns-debugging-resolution/
apiVersion: v1
kind: Pod
metadata:
  name: pod-dns-debug
spec:
  containers:
    - command:
        - sleep
        - "3600"
      image: gcr.io/kubernetes-e2e-test-images/dnsutils:1.3
      name: dnsutils

simple.yaml

---
apiVersion: v1
kind: Pod
metadata:
  name: pods-simple-pod
spec:
  containers:
    - command:
        - sleep
        - "3600"
      image: busybox
      name: pods-simple-container

See: https://kubernetes.io/docs/concepts/services-networking/add-entries-to-pod-etc-hosts-with-host-aliases/#adding-additional-entries-with-hostaliases

liveness/

advanced-liveness.yaml

            ---
apiVersion: v1
kind: Pod
metadata:
  labels:
    test: liveness
  name: liveness-http
spec:
  containers:
    - args:
        - /server
      image: k8s.gcr.io/liveness
      livenessProbe:
        httpGet:
          httpHeaders:
            - name: X-Custom-Header
              value: Awesome
          # when "host" is not defined, "PodIP" will be used
          # host: my-host
          # when "scheme" is not defined, "HTTP" scheme will be used. Only "HTTP" and "HTTPS" are allowed
          # scheme: HTTPS
          path: /healthz
          port: 8080
        initialDelaySeconds: 15
        timeoutSeconds: 1
      name: liveness
 

liveness.yaml

            ---
apiVersion: v1
kind: Pod
metadata:
  name: pods-liveness-exec-pod
spec:
  containers:
    - args:
        - /bin/sh
        - -c
        - touch /tmp/healthy; sleep 30; rm -rf /tmp/healthy; sleep 600
      image: busybox
      livenessProbe:
        exec:
          command:
            - cat
            - /tmp/healthy
        initialDelaySeconds: 5
        periodSeconds: 5
      name: pods-liveness-exec-container
 

spec.containers.livenessProbe/

advanced-liveness.yaml

            ---
apiVersion: v1
kind: Pod
metadata:
  labels:
    test: liveness
  name: liveness-http
spec:
  containers:
    - args:
        - /server
      image: k8s.gcr.io/liveness
      livenessProbe:
        httpGet:
          httpHeaders:
            - name: X-Custom-Header
              value: Awesome
          # when "host" is not defined, "PodIP" will be used
          # host: my-host
          # when "scheme" is not defined, "HTTP" scheme will be used. Only "HTTP" and "HTTPS" are allowed
          # scheme: HTTPS
          path: /healthz
          port: 8080
        initialDelaySeconds: 15
        timeoutSeconds: 1
      name: liveness
 

liveness.yaml

            ---
apiVersion: v1
kind: Pod
metadata:
  name: pods-liveness-exec-pod
spec:
  containers:
    - args:
        - /bin/sh
        - -c
        - touch /tmp/healthy; sleep 30; rm -rf /tmp/healthy; sleep 600
      image: busybox
      livenessProbe:
        exec:
          command:
            - cat
            - /tmp/healthy
        initialDelaySeconds: 5
        periodSeconds: 5
      name: pods-liveness-exec-container
 

spec.dnsConfig/

dns-config.yaml

            ---
apiVersion: v1
kind: Pod
metadata:
  name: dns-config-dns-config-pod
spec:
  containers:
    - name: test
      image: nginx
  dnsPolicy: "None"
  dnsConfig:
    nameservers:
      - 1.2.3.4
    searches:
      - ns1.svc.cluster-domain.example
      - my.dns.search.suffix
    options:
      - name: ndots
        value: "2"
      - name: edns0
 

spec.volumes.emptyDir/

emptydir.yaml

            ---
apiVersion: v1
kind: Pod
metadata:
  name: volumes-emptydir-pod
spec:
  containers:
    - command:
        - sleep
        - "3600"
      image: busybox
      name: volumes-emptydir-container
      volumeMounts:
        - mountPath: /volumes-emptydir-mount-path
          name: volumes-emptydir-volume
  volumes:
    - name: volumes-emptydir-volume
      emptyDir: {}
 

spec.volumes.hostPath.type/

file-or-create.yaml

            ---
# https://kubernetes.io/docs/concepts/storage/volumes/#example-pod-fileorcreate
apiVersion: v1
kind: Pod
metadata:
  name: volumes-file-or-create-pod
spec:
  containers:
    - command:
        - sleep
        - "3600"
      name: busybox
      image: busybox
      volumeMounts:
        - mountPath: /var/local/aaa
          name: volumes-file-or-create-dir
        - mountPath: /var/local/aaa/1.txt
          name: volumes-file-or-create-file
  volumes:
    - name: volumes-file-or-create-dir
      hostPath:
        # Ensure the file directory is created.
        path: /var/local/aaa
        type: DirectoryOrCreate
    - name: volumes-file-or-create-file
      hostPath:
        path: /var/local/aaa/1.txt
        type: FileOrCreate
 

spec.hostAliases/

host-aliases.yaml

            ---
# https://kubernetes.io/docs/concepts/services-networking/add-entries-to-pod-etc-hosts-with-host-aliases/#adding-additional-entries-with-hostaliases
apiVersion: v1
kind: Pod
metadata:
  name: pods-host-aliases-pod
spec:
  hostAliases:
    - ip: "127.0.0.1"
      hostnames:
        - "foo.local"
        - "bar.local"
    - ip: "10.1.2.3"
      hostnames:
        - "foo.remote"
        - "bar.remote"
  containers:
    - name: cat-hosts
      image: busybox
      command:
        - cat
      args:
        - "/etc/hosts"
 

spec.volumes.hostPath/

hostdir.yaml

            ---
apiVersion: v1
kind: Pod
metadata:
  name: volumes-hostdir-pod
spec:
  containers:
    - command:
        - sleep
        - "3600"
      image: busybox
      name: volumes-hostdir-container
      volumeMounts:
        - mountPath: /volumes-hostdir-mount-path
          name: volumes-hostdir-volume
  volumes:
    - hostPath:
        # directory location on host
        path: /tmp
      name: volumes-hostdir-volume
 

spec.initContainers/

init-container.yaml

            ---
apiVersion: v1
kind: Pod
metadata:
  name: init-container-pod
spec:
  containers:
    - name: init-container-container
      image: busybox
      command: ['sh', '-c', 'echo The app is running! && sleep 3600']
  initContainers:
    - name: init-container-init-container
      image: busybox
      command: ['sh', '-c', "until nslookup pods-init-container-service.$(cat /var/run/secrets/kubernetes.io/serviceaccount/namespace).svc.cluster.local; do echo waiting for myservice; sleep 2; done"]
 

spec.containers.lifecycle/

lifecycle.yaml

            ---
apiVersion: v1
kind: Pod
metadata:
  name: lifecycle-pod
spec:
  containers:
    - image: nginx
      lifecycle:
        postStart:
          exec:
            command: ["/bin/sh", "-c", "echo Hello from the postStart handler > /usr/share/message"]
        preStop:
          exec:
            command: ["/bin/sh", "-c", "nginx -s quit; while killall -0 nginx; do sleep 1; done"]
      name: lifecycle-container
 

resources_and_limits/

memory-request-limit.yaml

            ---
apiVersion: v1
kind: Pod
metadata:
  name: memory-request-limit-pod
spec:
  containers:
    - command: ["sleep", "3600"]
      image: busybox
      name: memory-request-limit-container
      resources:
        limits:
          memory: "200Mi"
        requests:
          memory: "100Mi"
 

resource-limit.yaml

            ---
apiVersion: v1
kind: Pod
metadata:
  name: resource-limit-pod
spec:
  containers:
    - name: resource-limit-container
      image: busybox
      args:
        - sleep
        - "600"
      resources:
        limits:
          cpu: "30m"
          memory: "200Mi"
 

resource-request.yaml

            ---
apiVersion: v1
kind: Pod
metadata:
  name: resource-request-pod
spec:
  containers:
    - name: resource-request-container
      image: busybox
      args:
        - sleep
        - "600"
      livenessProbe:
        exec:
          command:
            - cat
            - /tmp/healthy
        initialDelaySeconds: 5
        periodSeconds: 5
      resources:
        requests:
          memory: "20000Mi"
          cpu: "99999m"
 

spec.containers.resources/

memory-request-limit.yaml

            ---
apiVersion: v1
kind: Pod
metadata:
  name: memory-request-limit-pod
spec:
  containers:
    - command: ["sleep", "3600"]
      image: busybox
      name: memory-request-limit-container
      resources:
        limits:
          memory: "200Mi"
        requests:
          memory: "100Mi"
 

resource-limit.yaml

            ---
apiVersion: v1
kind: Pod
metadata:
  name: resource-limit-pod
spec:
  containers:
    - name: resource-limit-container
      image: busybox
      args:
        - sleep
        - "600"
      resources:
        limits:
          cpu: "30m"
          memory: "200Mi"
 

resource-request.yaml

            ---
apiVersion: v1
kind: Pod
metadata:
  name: resource-request-pod
spec:
  containers:
    - name: resource-request-container
      image: busybox
      args:
        - sleep
        - "600"
      livenessProbe:
        exec:
          command:
            - cat
            - /tmp/healthy
        initialDelaySeconds: 5
        periodSeconds: 5
      resources:
        requests:
          memory: "20000Mi"
          cpu: "99999m"
 

spec.containers/

multi-container.yaml

            ---
apiVersion: v1
kind: Pod
metadata:
  name: pods-multi-container-pod
spec:
  containers:
    - image: busybox
      command:
        - sleep
        - "3600"
      name: pods-multi-container-container-1
    - image: busybox
      command:
        - sleep
        - "3601"
      name: pods-multi-container-container-2
 

spec.affinity.nodeAffinity/

node-affinity.yaml

            ---
apiVersion: v1
kind: Pod
metadata:
  name: pod-node-affinity
spec:
  affinity:
    nodeAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
          - matchExpressions:
              - key: kubernetes.io/hostname
                operator: Exists
  containers:
    - command: ["sleep", "3600"]
      name: pod-node-affinity-container
      image: busybox
 

spec.volumes.persistentVolumeClaim/

pod-pvc.yaml

            ---
apiVersion: v1
kind: Pod
metadata:
  name: volume-pvc
spec:
  containers:
    - name: frontend
      image: nginx
      volumeMounts:
        - mountPath: /usr/share/nginx/html
          name: volume-pvc
  volumes:
    - name: volume-pvc
      persistentVolumeClaim:
        claimName: persitent-volume-claim
 

spec.dnsPolicy/

policy.yaml

            ---
# Adapted from: https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/#pod-s-dns-policy
# "Default": The Pod inherits the name resolution configuration from the node that the pods run on. See related discussion for more details.
# "ClusterFirst": Any DNS query that does not match the configured cluster domain suffix, such as "www.kubernetes.io", is forwarded to the upstream nameserver inherited from the node. Cluster administrators may have extra stub-domain and upstream DNS servers configured. See related discussion for details on how DNS queries are handled in those cases.
# "ClusterFirstWithHostNet": For Pods running with hostNetwork, you should explicitly set its DNS policy "ClusterFirstWithHostNet".
# "None": It allows a Pod to ignore DNS settings from the Kubernetes environment. All DNS settings are supposed to be provided using the dnsConfig field in the Pod Spec. See Pod's DNS config subsection below.

apiVersion: v1
kind: Pod
metadata:
  name: dns-config-policy-pod
spec:
  containers:
    - command:
        - sleep
        - "3600"
      image: busybox
      name: dns-config-policy-container
  hostNetwork: true
  dnsPolicy: ClusterFirstWithHostNet
 

spec.containers.securityContext/

privileged-namespace.yaml

            ---
# Namespace here refers to the container namespaces, not kubernetes
apiVersion: v1
kind: Pod
metadata:
  name: privileged-namespace-pod
spec:
  hostPID: true
  hostIPC: true
  hostNetwork: true
  containers:
    - command:
        - sleep
        - "3600"
      image: busybox
      name: privileged-namespace-container
      securityContext:
        privileged: true
 

privileged-simple.yaml

            ---
apiVersion: v1
kind: Pod
metadata:
  name: privileged-simple-pod
spec:
  containers:
    - command:
        - sleep
        - "3600"
      image: busybox
      name: privileged-simple-pod
      securityContext:
        privileged: true
 

spec.containers.volumes.projected/

projected.yaml

            ---
# https://kubernetes.io/docs/concepts/storage/volumes/#example-pod-with-a-secret-a-downward-api-and-a-configmap
apiVersion: v1
kind: Pod
metadata:
  name: volumes-projected-pod
spec:
  containers:
    - command:
        - sleep
        - "3600"
      image: busybox
      name: volumes-projected-container
      volumeMounts:
        - name: volumes-projected-volume-mount
          mountPath: "/volumes-projected-volume-path"
          readOnly: true
  volumes:
    - name: volumes-projected-volume-mount
      projected:
        sources:
          - secret:
              items:
                - key: username
                  path: my-group/my-username
                  mode: 511
              name: volumes-projected-secret
          - downwardAPI:
              items:
                - path: "labels"
                  fieldRef:
                    fieldPath: metadata.labels
                - path: "cpu_limit"
                  resourceFieldRef:
                    containerName: container-test
                    resource: limits.cpu
          - configMap:
              items:
                - key: config
                  path: my-group/my-config
              name: volumes-projected-configmap
 

spec.containers.readinessProbe/

readiness.yaml

            ---
apiVersion: v1
kind: Pod
metadata:
  name: pods-readiness-exec-pod
spec:
  containers:
    - args:
        - /bin/sh
        - -c
        - touch /tmp/healthy; sleep 30; rm -rf /tmp/healthy; sleep 600
      image: busybox
      readinessProbe:
        exec:
          command:
            - cat
            - /tmp/healthy
        initialDelaySeconds: 5
      name: pods-readiness-exec-container
 

readiness/

readiness.yaml

            ---
apiVersion: v1
kind: Pod
metadata:
  name: pods-readiness-exec-pod
spec:
  containers:
    - args:
        - /bin/sh
        - -c
        - touch /tmp/healthy; sleep 30; rm -rf /tmp/healthy; sleep 600
      image: busybox
      readinessProbe:
        exec:
          command:
            - cat
            - /tmp/healthy
        initialDelaySeconds: 5
      name: pods-readiness-exec-container
 

spec.containers.volumes.projected.sources.serviceAccountToken/

sa-token.yaml

            ---
# https://kubernetes.io/docs/concepts/storage/volumes/#example-pod-with-a-secret-a-downward-api-and-a-configmap
apiVersion: v1
kind: Pod
metadata:
  name: volumes-sa-token-pod
spec:
  containers:
    - name: container-test
      image: busybox
      volumeMounts:
        - mountPath: "/service-account"
          name: volumes-sa-token-volume
          readOnly: true
  volumes:
    - name: volumes-sa-token-volume
      projected:
        sources:
          - serviceAccountToken:
              audience: api
              expirationSeconds: 3600
              path: token
 

spec.terminationGracePeriodSeconds/

simple.yaml

            ---
apiVersion: v1
kind: Pod
metadata:
  name: pods-termination-grace-period-seconds
spec:
  containers:
    - command:
        - sleep
        - "3600"
      image: busybox
      name: pods-termination-grace-period-seconds
  terminationGracePeriodSeconds: 5  # Time to wait before moving from a TERM signal to the pod's main process to a KILL signal.
 

spec.containers.volumeMounts.subPath/

subpath.yaml

            ---
# https://kubernetes.io/docs/concepts/storage/volumes/#using-subpath
# Sometimes, it is useful to share one volume for multiple uses in a single Pod.
# The volumeMounts.subPath property can be used to specify a sub-path inside the
# referenced volume instead of its root.
apiVersion: v1
kind: Pod
metadata:
  name: volumes-subpath-pod
spec:
  containers:
    - env:
        - name: MYSQL_ROOT_PASSWORD
          value: "rootpasswd"
      image: mysql
      name: mysql
      volumeMounts:
        - mountPath: /var/lib/mysql
          name: site-data
          subPath: mysql
    - image: php:7.0-apache
      name: php
      volumeMounts:
        - mountPath: /var/www/html
          name: site-data
          subPath: html
  volumes:
    - name: site-data
      persistentVolumeClaim:
        claimName: my-lamp-site-data
 

spec.containers.volumeMounts.subPathExpr/

subpathexpr.yaml

            ---
# https://kubernetes.io/docs/concepts/storage/volumes/#using-subpath-with-expanded-environment-variables
apiVersion: v1
kind: Pod
metadata:
  name: volumes-subpathexpr-pod
spec:
  containers:
    - command: ["sleep", "3600"]
      env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              apiVersion: v1
              fieldPath: metadata.name
      image: busybox
      name: volumes-subpathexpr-container
      volumeMounts:
        - name: volumes-subpathexpr-volume
          mountPath: /logs
          subPathExpr: $(POD_NAME)
  restartPolicy: Never
  volumes:
    - name: volumes-subpathexpr-volume
      hostPath:
        path: /var/log/pods
 

spec.topologySpreadConstraints/

topology-spread-constraints-with-node-affinity.yaml

            ---
# https://kubernetes.io/docs/concepts/workloads/pods/pod-topology-spread-constraints/
kind: Pod
apiVersion: v1
metadata:
  name: topology-spread-constraints-with-node-affinity-pod
  labels:
    label1: value1
spec:
  topologySpreadConstraints:
    - labelSelector:
        matchLabels:
          label1: value1
      maxSkew: 1
      topologyKey: zone
      whenUnsatisfiable: DoNotSchedule
  affinity:
    nodeAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
          - matchExpressions:
              - key: zone
                operator: NotIn
                values:
                  - zoneC
  containers:
    - name: pause
      image: k8s.gcr.io/pause:3.1
 

topology-spread-constraints.yaml

            ---
# https://kubernetes.io/docs/concepts/workloads/pods/pod-topology-spread-constraints/
kind: Pod
apiVersion: v1
metadata:
  name: topology-spread-constraints-pod
  labels:
    label1: value1
spec:
  topologySpreadConstraints:
    - maxSkew: 1
      topologyKey: zone
      whenUnsatisfiable: DoNotSchedule
      labelSelector:
        matchLabels:
          label1: value1
  containers:
    - name: pause
      image: k8s.gcr.io/pause:3.1
 

spec.containers.imagePullPolicy/

image-pull-policy.yaml

            # imagePullPolicies: IfNotPresent, Always
---
apiVersion: v1
kind: Pod
metadata:
  name: pods-image-pull-policy-pod
spec:
  containers:
    - command:
        - sleep
        - "3600"
      image: busybox
      imagePullPolicy: IfNotPresent
      name: pods-image-pull-policy-container
 

spec.imagePullSecrets/

image-pull-secrets.yaml

            # https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry/
---
apiVersion: v1
kind: Pod
metadata:
  name: pods-image-pull-secrets-pod
spec:
  containers:
    - command:
        - sleep
        - "3600"
      image: busybox
      name: pods-image-pull-secrets-container
  imagePullSecrets:
    - name: regcred  # does not exist, create with instructions above
 

spec.nodeSelector/

simple.yaml

            # Assumes the existence of the label: node-role.kubernetes.io/master, and tries to assign the pod to the labelled node.
---
apiVersion: v1
kind: Pod
metadata:
  name: pod-node-selector-simple
spec:
  containers:
    - command: ["sleep", "3600"]
      image: busybox
      name: pod-node-selector-simple-container
  nodeSelector:
    node-role.kubernetes.io/master: ""
 

spec.tolerations/

toleration.yaml

            # IMPORTANT:
#
# This example makes some assumptions:
#
# - There is one single node that is also a master (called 'master')
# - The following command has been run: `kubectl taint nodes master pod-toleration:NoSchedule`
#
# Once the master node is tainted, a pod will not be scheduled on there (you can try the below yaml _without_ the spec.toleration to test this).
#
# CLEANUP:
#
#   delete pod pod-toleration                               # delete pod
#   kubectl taint nodes master pod-toleration:NoSchedule-   # delete taint
---
apiVersion: v1
kind: Pod
metadata:
  name: pod-toleration
spec:
  containers:
    - command: ["sleep", "3600"]
      image: busybox
      name: pod-toleration-container
  tolerations:
    - key: ""  # empty means match all taint keys
      operator: Exists
 

taints_and_tolerations/

toleration.yaml

            # IMPORTANT:
#
# This example makes some assumptions:
#
# - There is one single node that is also a master (called 'master')
# - The following command has been run: `kubectl taint nodes master pod-toleration:NoSchedule`
#
# Once the master node is tainted, a pod will not be scheduled on there (you can try the below yaml _without_ the spec.toleration to test this).
#
# CLEANUP:
#
#   delete pod pod-toleration                               # delete pod
#   kubectl taint nodes master pod-toleration:NoSchedule-   # delete taint
---
apiVersion: v1
kind: Pod
metadata:
  name: pod-toleration
spec:
  containers:
    - command: ["sleep", "3600"]
      image: busybox
      name: pod-toleration-container
  tolerations:
    - key: ""  # empty means match all taint keys
      operator: Exists
 

tolerations/

toleration.yaml

            # IMPORTANT:
#
# This example makes some assumptions:
#
# - There is one single node that is also a master (called 'master')
# - The following command has been run: `kubectl taint nodes master pod-toleration:NoSchedule`
#
# Once the master node is tainted, a pod will not be scheduled on there (you can try the below yaml _without_ the spec.toleration to test this).
#
# CLEANUP:
#
#   delete pod pod-toleration                               # delete pod
#   kubectl taint nodes master pod-toleration:NoSchedule-   # delete taint
---
apiVersion: v1
kind: Pod
metadata:
  name: pod-toleration
spec:
  containers:
    - command: ["sleep", "3600"]
      image: busybox
      name: pod-toleration-container
  tolerations:
    - key: ""  # empty means match all taint keys
      operator: Exists