Difference between revisions of "Kind: Pod"

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  [[apiVersion]]: v1
+
{{lowercase}}
  [[kind:]] Pod
+
 
 +
[[spec.]]
 +
  [[spec.containers]]
 +
[[spec.volumes]]
 +
[[spec.initContainers]]
 +
[[spec.securityContext]]
 +
[[spec.nodeSelector]]
 +
  [[spec.imagePullSecrets]]
 +
 
 +
=== [[Nginx example]] ===
 +
{{kind pod nginx}}
 +
 
 +
 
 +
Alpine container to access a PV:
 +
{{alpine cp example}}
 +
 
 +
 
 +
https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/
 +
 +
{{kind pod resources}}
 +
 
 +
== [[initContainers]] ==
 +
https://kubernetes.io/docs/concepts/workloads/pods/init-containers/#init-containers-in-use
 +
apiVersion: v1
 +
kind: Pod
 
  metadata:
 
  metadata:
  name: nginx
+
  name: myapp-pod
  labels:
+
  labels:
    env: test
+
    app: myapp
 
  spec:
 
  spec:
  containers:
+
  containers:
  - name: nginx
+
  - name: myapp-container
    image: nginx
+
    image: busybox:1.28
    imagePullPolicy: IfNotPresent
+
    command: ['sh', '-c', 'echo The app is running! && sleep 3600']
  nodeSelector:
+
  [[initContainers]]:
    disktype: ssd
+
  - name: init-myservice
 +
    image: busybox:1.28
 +
    command: ['sh', '-c', "until nslookup myservice.$(cat /var/run/secrets/kubernetes.io/serviceaccount/namespace).svc.cluster.local; do echo  waiting for myservice; sleep 2; done"]
 +
  - name: init-mydb
 +
    image: busybox:1.28
 +
    command: ['sh', '-c', "until nslookup mydb.$(cat /var/run/secrets/kubernetes.io/serviceaccount/namespace).svc.cluster.local; do echo waiting for mydb; sleep 2; done"]
 +
 
 +
 
 +
== [[securityContext]] ==
 +
{{kind_pod_securitycontext}}
 +
 
 +
== [[imagePullSecrets]] ==
 +
 
 +
{{imagepullsecrets ex}}
 +
 
 +
== [[Sidecar]] container ==
 +
{{sidecar-container}}
  
 +
== Related ==
 +
* <code>[[dnsPolicy:]]</code>
 +
* [[Kubernetes init containers]]
 +
* <code>[[autoScaler:]]</code>
 +
* <code>[[envFrom:]]</code>
 +
* <code>[[LivenessProbe]]</code>
 +
* <code>[[lifecycle:]]</code>
 +
* <code>[[ports:]]</code>
 +
* [[Kubernetes, env:]]
 +
* <code>[[nodeName]]</code>
 +
* <code>[[NodeSelector]]</code>
 +
* <code>[[kind: ReplicaSet]]</code>
 +
* <code>[[kubectl run]]</code>
 +
* [[Configure a Security Context for a Pod or Container]]
 +
* [[Resource Management for Pods and Containers]]
 +
* [[imagePullSecrets]]
 +
* Kubernetes changelog: [[AppArmor]] profiles can now be configured through fields on the [[PodSecurityContext]] and container [[SecurityContext]]
  
 
== See also ==
 
== See also ==
* [[Kind (Kubernetes)]]
+
* {{kind: Pod}}
* {{K8s}}
+
* {{Pods}}
  
 
[[Category:K8s]]
 
[[Category:K8s]]

Latest revision as of 18:42, 27 October 2024

spec.
spec.containers
spec.volumes
spec.initContainers
spec.securityContext
spec.nodeSelector
spec.imagePullSecrets

Nginx example[edit]

 apiVersion: v1
kind: Pod
metadata:
  name: nginx
  labels:
    env: test
spec:
  containers:
  - name: nginx
    image: nginx
    imagePullPolicy: IfNotPresent
  nodeSelector:
    disktype: ssd


Alpine container to access a PV:

 apiVersion: v1
kind: Pod
metadata:
  name: myalpinewithvolume
spec:
  containers:
  - name: alpine
    image: alpine:latest
    command: ['ash']
    tty: true
    stdin: true
    volumeMounts:
    - name: myvolume
      mountPath: /myvolume
  volumes:
  - name: myvolume
    persistentVolumeClaim:
      claimName: myPVCtoMount


https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/

---
apiVersion: v1
kind: Pod
metadata:
  name: frontend
spec:
  containers:
  - name: app
    image: images.my-company.example/app:v4
    resources:
      requests:
        memory: "64Mi"
        cpu: "250m"
      limits:
        memory: "128Mi"
        cpu: "500m"
  - name: log-aggregator
    image: images.my-company.example/log-aggregator:v6
    resources:
      requests:
        memory: "64Mi"
        cpu: "250m"
      limits:
        memory: "128Mi"
        cpu: "500m"

initContainers[edit]

https://kubernetes.io/docs/concepts/workloads/pods/init-containers/#init-containers-in-use

apiVersion: v1
kind: Pod
metadata:
 name: myapp-pod
 labels:
   app: myapp
spec:
 containers:
 - name: myapp-container
   image: busybox:1.28
   command: ['sh', '-c', 'echo The app is running! && sleep 3600']
 initContainers:
 - name: init-myservice
   image: busybox:1.28
   command: ['sh', '-c', "until nslookup myservice.$(cat /var/run/secrets/kubernetes.io/serviceaccount/namespace).svc.cluster.local; do echo  waiting for myservice; sleep 2; done"]
 - name: init-mydb
   image: busybox:1.28
   command: ['sh', '-c', "until nslookup mydb.$(cat /var/run/secrets/kubernetes.io/serviceaccount/namespace).svc.cluster.local; do echo waiting for mydb; sleep 2; done"]


securityContext[edit]

apiVersion: v1
kind: Pod
metadata:
  name: security-context-demo
spec:
  securityContext:
    runAsUser: 1000
    runAsGroup: 3000
    fsGroup: 2000
  volumes:
  - name: sec-ctx-vol
    emptyDir: {}
  containers:
  - name: sec-ctx-demo
    image: busybox:1.28
    command: [ "sh", "-c", "sleep 1h" ]
    volumeMounts:
    - name: sec-ctx-vol
      mountPath: /data/demo
    securityContext:
      allowPrivilegeEscalation: false

imagePullSecrets[edit]

 apiVersion: v1
kind: Pod
metadata:
  name: private-reg
spec:
  containers:
  - name: private-reg-container
    image: <your-private-image>
  imagePullSecrets:
  - name: regcred

Sidecar container[edit]

 apiVersion: v1
kind: Pod
metadata:
  name: my-pod
spec:
  containers:
  - name: main-container
    image: busybox
    command: ["sh", "-c", "echo 'Main process running'; sleep 30"]
  - name: sidecar-container
    image: busybox
    command: ["sh", "-c", "while true; do sleep 3600; done"]

Related[edit]

See also[edit]

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