Kubernetes中Pod对象学习笔记_pod.metadata.labels

apiVersion: v1
kind: Pod
...
spec:
nodeSelector:
   disktype: ssd

apiVersion: v1
kind: Pod
...
spec:
  hostAliases:
  - ip: "10.1.2.3"
    hostnames:
    - "foo.remote"
    - "bar.remote"
...

apiVersion: v1
kind: Pod
metadata:
  name: lifecycle-demo
spec:
  containers:
  - name: lifecycle-demo-container
    image: nginx
    lifecycle:
      postStart:
        exec:
          command: ["/bin/sh", "-c", "echo Hello from the postStart handler > /usr/share/message"]
      preStop:
        exec:
          command: ["/usr/sbin/nginx","-s","quit"]

apiVersion: v1
kind: Pod
metadata:
  name: test-projected-volume
spec:
  containers:
  - name: test-secret-volume
    image: busybox
    args:
    - sleep
    - "86400"
    volumeMounts:
    - name: mysql-cred
      mountPath: "/projected-volume"
      readOnly: true
  volumes:
  - name: mysql-cred
    projected:
      sources:
      - secret:
          name: user
      - secret:
          name: pass

$ cat ./username.txt
 
admin
$ cat ./password.txt
c1oudc0w!
$ kubectl create secret generic user --from-file=./username.txt
$ kubectl create secret generic pass --from-file=./password.txt

apiVersion: v1
kind: Secret
metadata:
  name: mysecret
type: Opaque
data:
  user: YWRtaW4=
  pass: MWYyZDFlMmU2N2Rm

$ echo -n 'admin' | base64
YWRtaW4=
$ echo -n '1f2d1e2e67df' | base64
MWYyZDFlMmU2N2Rm
 
#解码输出
echo -n "str" | base64 -d

$ kubectl create -f test-projected-volume.yaml

$ kubectl exec -it test-projected-volume -- /bin/sh
$ ls /projected-volume/
user
pass
$ cat /projected-volume/user
root
$ cat /projected-volume/pass
1f2d1e2e67df

$ cat example/ui.properties
color.good=purple
color.bad=yellow
allow.textmode=true
how.nice.to.look=fairlyNice
# 从.properties文件创建ConfigMap
$ kubectl create configmap ui-config --from-file=example/ui.properties
# 查看这个ConfigMap里保存的信息(data)
$ kubectl get configmaps ui-config -o yaml
apiVersion: v1
data:
  ui.properties: |
    color.good=purple
    color.bad=yellow
    allow.textmode=true
    how.nice.to.look=fairlyNice
kind: ConfigMap
metadata:
  name: ui-config
  ...

apiVersion: v1
kind: Pod
metadata:
  name: test-downwardapi-volume
  labels:
    zone: us-est-coast
    cluster: test-cluster1
    rack: rack-22
spec:
  containers:
    - name: client-container
      image: k8s.gcr.io/busybox
      command: ["sh", "-c"]
      args:
      - while true; do
          if [[ -e /etc/podinfo/labels ]]; then
            echo -en '\n\n'; cat /etc/podinfo/labels; fi;
          sleep 5;
        done;
      volumeMounts:
        - name: podinfo
          mountPath: /etc/podinfo
          readOnly: false
  volumes:
    - name: podinfo
      projected:
        sources:
        - downwardAPI:
            items:
              - path: "labels"
                fieldRef:
                  fieldPath: metadata.labels

$ kubectl create -f dapi-volume.yaml
$ kubectl logs test-downwardapi-volume
cluster="test-cluster1"
rack="rack-22"
zone="us-est-coast"

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

...
livenessProbe:
     httpGet:
       path: /healthz
       port: 8080
       httpHeaders:
       - name: X-Custom-Header
         value: Awesome
       initialDelaySeconds: 3
       periodSeconds: 3
    ...
    livenessProbe:
      tcpSocket:
        port: 8080
      initialDelaySeconds: 15
      periodSeconds: 20

cat preset.yaml
apiVersion: settings.k8s.io/v1alpha1
kind: PodPreset
metadata:
  name: allow-database
spec:
  selector:
    matchLabels:
      role: frontend
  env:
    - name: DB_PORT
      value: "6379"
  volumeMounts:
    - mountPath: /cache
      name: cache-volume
  volumes:
    - name: cache-volume
      emptyDir: {}

$ kubectl get pod website -o yaml
apiVersion: v1
kind: Pod
metadata:
  name: website
  labels:
    app: website
    role: frontend
  annotations:
    podpreset.admission.kubernetes.io/podpreset-allow-database: "resource version"
spec:
  containers:
    - name: website
      image: nginx
      volumeMounts:
        - mountPath: /cache
          name: cache-volume
      ports:
        - containerPort: 80
      env:
        - name: DB_PORT
          value: "6379"
  volumes:
    - name: cache-volume
      emptyDir: {}