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1.pod 控制器类别
ReplicaSet
deployment 次要
Horizontal Pod Autoscaler (hpa) 高可用 实现削峰填谷
DaemonSet 守护进厂类的工作
Job 执行一次工作，执行完之后就完结
Cronjob 周期性的执行工作
StatefulSet 治理有状态利用 2. 具体控制器
------------------------------------------------pod 控制器 ------------------------------------------------------
replicaset
apiVersion: apps/v1
kind: ReplicaSet
metadata:
name: myrs
namespace: dev
labels:
controller: rs
spec:
replicas: 3
selector:
matchLabels:
app: nginx-pod
matchExpressions:
- {key: app,operator: In, Values: [nginx-pod]}
template:
metadata:
labels:
app: nginx-pod
spec:
containers:
- name: nginx
image: nginx:1.17.1
ports:
- containerPort: 80
--------------------------------------------
apiVersion: apps/v1
kind: ReplicaSet
metadata:
name: my-rs
namespace: dev
spec:
replicas: 3
selector:
matchLabels:
app: nginx-pod
template:
metadata:
labels:
app: nginx-pod
spec:
containers:
- name: my-nginx
image: nginx
--------------------------------------------
[root@node1 ~]# kubectl get rs -n dev -o wide
NAME DESIRED CURRENT READY AGE CONTAINERS IMAGES SELECTOR
my-rs 3 3 3 3m34s my-nginx nginx app=nginx-pod
--------------------------------------------
[root@node1 ~]# kubectl get pod -n dev
NAME READY STATUS RESTARTS AGE
my-rs-6wbdd 1/1 Running 0 5m
my-rs-cs6nr 1/1 Running 0 5m
my-rs-hzncc 1/1 Running 0 5m
--------------------------------------------
rs 扩缩容
kubectl edit rs my-rs -n dev 批改 replicas 即可
kubectl scale rs my-rs --replicas=2 -n dev
--------------------------------------------
镜像版本升级
kubectl edit rs my-rs -n dev 批改 image
kubectl set image rs my-rs my-nginx=nginx:1.18.0 -n dev
删除 rs
kubectl delete rs my-rs -n dev #首先把正本数设置成 0, 而后再删除
kubectl delete rs my-rs -n dev --cascade=false #只删除控制器，不删除 pod
kubectl delete -f my-rs.yaml
---------------
deployment
反对 replicaset 的所有性能
反对版本回滚和版本回退
apiVersion: apps/v1
kind: Deployment
metadata:
name: mynginx
namespace: dev
spec:
replicas: 3
selector:
matchLabels:
run: nginx
template:
metadata:
labels:
run: nginx
spec:
containers:
- image: nginx
imagePullPolicy: IfNotPresent
name: nginx
ports:
- containerPort: 80
protocol: TCP
kubectl apply -f yaml-nginx-deploy.yaml
kubectl delete -f yaml-nginx-deploy.yaml
查问对应的 rs:
[root@node1 ~]# kubectl get rs -n dev -o wide
NAME DESIRED CURRENT READY AGE CONTAINERS IMAGES SELECTOR
mynginx-869c47cdd9 3 3 3 3m32s nginx nginx pod-template-hash=869c47cdd9,run=nginx
扩缩容：kubectl scale deploy my-nginx --replicas=5 -n dev
kubectl edit deploy my-nginx -n dev
[root@node1 ~]# kubectl scale deploy mynginx --replicas=5 -n dev
deployment.apps/mynginx scaled
kubectl edit deploy mynginx -n dev
批改 replicas
镜像降级:
重建更新：滚动更新：(默认滚动更新) 新的起来了之后，旧的才会进行
-----
spec:
strategy:
type: Recreate
-----
spec:
strategy:
type: RollingUpdate
maxUnavailable: 25%
maxSurge: 25%
kubectl set image deploy mynginx nginx=nginx -n dev
kubectl get pod -n dev -w
滚动更新 镜像降级，创立新的 rs，原来的 rs 会进行保留，成为上一个版本
版本回退
kubectl rollout
status history pause resume restart undo
查看状态
[root@node1 ~]# kubectl rollout status deploy mynginx -n dev
Waiting for deployment "mynginx" rollout to finish: 1 out of 2 new replicas have been updated...
Waiting for deployment "mynginx" rollout to finish: 1 out of 2 new replicas have been updated...
Waiting for deployment "mynginx" rollout to finish: 1 out of 2 new replicas have been updated...
Waiting for deployment "mynginx" rollout to finish: 1 old replicas are pending termination...
Waiting for deployment "mynginx" rollout to finish: 1 old replicas are pending termination...
deployment "mynginx" successfully rolled out
查看历史
kubectl rollout history deploy mynginx -n dev
kubectl apply -f yaml-nginx-deploy.yaml --record
查看历史
[root@node1 ~]# kubectl rollout history deploy mynginx -n dev
deployment.apps/mynginx
REVISION CHANGE-CAUSE
1 <none>
2 <none>
// 回退版本 to-revision 指定版本
[root@node1 ~]#
[root@node1 ~]#
[root@node1 ~]# kubectl rollout undo deployment mynginx --to-revision=1 -n dev
金丝雀公布
中间状态：灰度公布
kubectl set image deploy mynginx nginx=nginx:1.17.4 -n dev && kubectl rollout pause deploy mynginx -n dev
--------------------------------------------------hpa------------------------------------------
Horizontal Pod Autoscaler
手动调整改为主动调整，须要计算负载量
须要装置监控 Metrics-server
kubectl top node 查看资源应用信息
apiVersion：autoscaling/v1
kind: HorizontalPodAutoscaler
metadata:
name: my-hpa
namespace: dev
spec:
minReplicas: 1
maxReplicase: 10
targetCPUUtilizationPercentage: 3
scaleTargeRef:
apiVersion: apps/v1
kind: Deployment
name: mynginx
--------------------------------------------------hpa------------------------------------------
网络局部 cni
--------------------------------------------------DaemonSet（ds）------------------------------------------
保障集群中每个节点运行一个 pod
每增加一个 node, 就会主动运行 pod
其 yaml 格局同 deploy
--------------------------------------------------DaemonSet------------------------------------------
--------------------------------------------------job------------------------------------------
批量解决一次性工作
job 对应的 pod 的重启策略为 Never, 或者 OnFailure
次要的配置项：manualSelector: true
completions: 6 #指定运行的 pod 总数
parallelism：3 #并发执行总数
--------------------------------------------------Cronjob------------------------------------------
job 工作创立之后立即执行
cronjob 以 job 为治理对象，相似 cron 表达式
在指定的工夫点执行工作，反复运行
schedule: cron 表达式，最短时间为分钟
concurrencyPolicy: 并发执行工作，前一次工作没有实现，是否执行下一次工作，Allow 容许（默认）Forbid 禁止 Replace 替换，勾销以后的工作，执行新的工作
failedJobHistoryLimit: 为失败的工作保留的历史记录数目
successfulJobHistoryLimit: 为胜利的工作保留历史记录数目
startingDeadlineSeconds: 启动工作谬误的超时工夫
jobTemplate: 正文完