Pod 高级控制器
Pod 高级控制器
- ReplicaSet
- Deployment
- DaemonSet
- Job
- CronJob
ReplicaSet
$ cat rs-pod.yaml
apiVersion: apps/v1
kind: ReplicaSet
metadata:
name: rs-example
spec:
replicas: 2
selector:
matchLabels:
app: rs-demo
template:
metadata:
labels:
app: rs-demo
spec:
containers:
- name: myapp
image: myapp:v1
ports:
- name: http
containerPort: 80$ kubectl apply -f rs-pod.yaml
replicaset.apps/rs-example created
$ kubectl get pod
NAME READY STATUS RESTARTS AGE
rs-example-4r7rl 1/1 Running 0 4s
rs-example-hngbv 1/1 Running 0 4s
# 批改其中一个 pod 的标签，replicaset 控制器会主动保护正本数量，如果标签不存在的会变成独立 pod
$ kubectl label pods rs-example-4r7rl app= --overwrite
pod/rs-example-4r7rl labeled
$ kubectl get pod --show-labels
NAME READY STATUS RESTARTS AGE LABELS
rs-example-4r7rl 1/1 Running 0 37s app=
rs-example-54589 1/1 Running 0 9s app=rs-demo
rs-example-hngbv 1/1 Running 0 37s app=rs-demo
Deployment
$ cat myapp-deploy.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: myapp-deploy
spec:
replicas: 3
selector:
matchLabels:
app: myapp
template:
metadata:
labels:
app: myapp
spec:
containers:
- name: myapp
image: myapp:v1
ports:
- containerPort: 80
name: http# 通过 Deployments 创立 pod
$ kubectl apply -f myapp-deploy.yaml --record
deployment.apps/myapp-deploy created
# 查看 deployment 状态
$ kubectl get deployments
NAME READY UP-TO-DATE AVAILABLE AGE
myapp-deploy 3/3 3 3 11s
$ kubectl describe deployments myapp-deploy
Name: myapp-deploy
Namespace: default
CreationTimestamp: Tue, 21 Jul 2020 22:19:16 +0800
Labels: <none>
Annotations: deployment.kubernetes.io/revision: 1
kubectl.kubernetes.io/last-applied-configuration:
{"apiVersion":"apps/v1","kind":"Deployment","metadata":{"annotations":{"kubernetes.io/change-cause":"kubectl apply --filename=myapp-deploy...
kubernetes.io/change-cause: kubectl apply --filename=myapp-deploy.yaml --record=true
Selector: app=myapp
Replicas: 3 desired | 3 updated | 3 total | 3 available | 0 unavailable
StrategyType: RollingUpdate
MinReadySeconds: 0
RollingUpdateStrategy: 25% max unavailable, 25% max surge
Pod Template:
Labels: app=myapp
Containers:
myapp:
Image: myapp:v1
Port: 80/TCP
Host Port: 0/TCP
Environment: <none>
Mounts: <none>
Volumes: <none>
Conditions:
Type Status Reason
---- ------ ------
Available True MinimumReplicasAvailable
Progressing True NewReplicaSetAvailable
OldReplicaSets: <none>
NewReplicaSet: myapp-deploy-76c6f7d88 (3/3 replicas created)
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal ScalingReplicaSet 24s deployment-controller Scaled up replica set myapp-deploy-76c6f7d88 to 3
# 查看变更历史
$ kubectl rollout history deployment/myapp-deploy
deployment.apps/myapp-deploy
REVISION CHANGE-CAUSE
1 kubectl apply --filename=myapp-deploy.yaml --record=true
DaemonSet
$ cat filebeat-ds.yaml
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: filebeat-ds
labels:
app: filebeat
spec:
selector:
matchLabels:
app: filebeat
template:
metadata:
labels:
app: filebeat
name: filebeat
spec:
containers:
- name: filebeat
image: store/elastic/filebeat:7.6.2
env:
- name: REDIS_HOST
value: db.ilinux.io:6379
- name: LOG_LEVEL
value: info
$ kubectl apply -f filebeat-ds.yaml
$ kubectl get daemonset
NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE
filebeat-ds 1 1 1 1 1 <none> 4m13s
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
filebeat-ds-nrzbn 1/1 Running 0 4m15s
# 更新 DaemonSet 对象
$ kubectl set image daemonsets filebeat-ds filebeat=store/elastic/filebeat:7.6.0
Job
$ cat job-example.yaml
apiVersion: batch/v1
kind: Job
metadata:
name: job-example
spec:
template:
spec:
containers:
- name: myjob
image: busybox
command: ["/bin/sh", "-c", "sleep 120"]
restartPolicy: Never
$ kubectl apply -f job-example.yaml
$ kubectl get jobs
NAME COMPLETIONS DURATION AGE
job-example 0/1 66s 66s
$ kubectl describe jobs job-example
Name: job-example
Namespace: default
Selector: controller-uid=9aad5c45-d165-4824-9982-16a0e746babd
Labels: controller-uid=9aad5c45-d165-4824-9982-16a0e746babd
job-name=job-example
Annotations: kubectl.kubernetes.io/last-applied-configuration:
{"apiVersion":"batch/v1","kind":"Job","metadata":{"annotations":{},"name":"job-example","namespace":"default"},"spec":{"template":{"spec":...
Parallelism: 1
Completions: 1
Start Time: Tue, 07 Apr 2020 22:51:27 +0800
Pods Statuses: 1 Running / 0 Succeeded / 0 Failed
Pod Template:
Labels: controller-uid=9aad5c45-d165-4824-9982-16a0e746babd
job-name=job-example
Containers:
myjob:
Image: busybox
Port: <none>
Host Port: <none>
Command:
/bin/sh
-c
sleep 120
Environment: <none>
Mounts: <none>
Volumes: <none>
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal SuccessfulCreate 94s job-controller Created pod: job-example-ftrb9
$ kubectl get pod -w
NAME READY STATUS RESTARTS AGE
job-example-ftrb9 1/1 Running 0 104s
job-example-ftrb9 0/1 Completed 0 2m7s
并行性 Job
$ cat job-multi.yaml
apiVersion: batch/v1
kind: Job
metadata:
name: job-multi
spec:
completions: 5
template:
spec:
containers:
- name: myjob
image: alpine
command: ["/bin/sh", "-c", "sleep 20"]
restartPolicy: OnFailure
$ kubectl apply -f job-multi.yaml
$ kubectl get pod -w
NAME READY STATUS RESTARTS AGE
job-multi-5tcbs 0/1 Completed 0 2m17s
job-multi-bv6cg 0/1 Completed 0 3m43s
job-multi-nnskm 0/1 Completed 0 2m45s
job-multi-qp7nq 0/1 Completed 0 3m11s
job-multi-xz6dn 0/1 Completed 0 110s