Pod-hook:
postStart:
1.
$ $ vim preStart-hook.yaml
---
apiVersion: v1
kind: Pod
metadata:
name: hook-demo1
labels:
app: hook
spec:
containers:
- name: hook-demo1
image: nginx
ports:
- name: webport
containerPort: 80
lifecycle:
postStart:
exec:
command: ["/bin/sh", "-c", "echo Hello from the postStart Hander > /usr/share/message"]
$ kubectl exec hook-demo1 -i -t /bin/bash
preStop:
2.强制删除
$ kubectl delete pod hook-demo1 --force --grace-period=0
$ vim preStop-hook.yaml
---
apiVersion: v1
kind: Pod
metadata:
name: hook-demo2
labels:
app: hook
spec:
containers:
- name: hook-demo2
image: nginx
ports:
- name: webport
containerPort: 80
volumeMounts:
- name: message
mountPath: /usr/share
lifecycle:
preStop:
exec:
command: ["/bin/sh", "-c", "echo Hello from the postStop Hander > /usr/share/message"]
volumes:
- name: message
hostPath:
path: /tmp
普通的pod是不能被调度到master节点上面来的
存活探针:
liveness probe
$ vim liveness-exec.yaml
---
apiVersion: v1
kind: Pode
metadata:
name: liveness-exec
labels:
app: liveness
spec:
containers:
- name: liveness
images: 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
初始化容器-initcontainer
$ vim initpod1.yaml
---
apiVersion: v1
kind: Pod
metadata:
name: init-pod
labels:
app: init
spec:
initContainers:
- name: init-myservice
image: busybox
command: ['sh', '-c', 'until nslookup myservice; do echo waiting for myservice; sleep 2; done;']
- name:
image: busybox
command: ['sh', '-c', 'until nslookup mydb; do echo waiting for mydb; sleep 2; done;']
containers:
- name: main-container
image: busybox
command: ['sh', '-c', 'echo The app is running! && sleep 3600']