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一 为什么使用控制器
pod控制器
作用：1.pod类型资源删除，不会重建
2.控制器可以帮助用户监控，并保证节点上运行定义好的pod副本数
3.pod超过或低于用户期望，控制器会创建、删除pod副本数量
控制器类型：
- RS控制器:按照用户期望的副本数量，创建pod, 用户写yaml，定义RS控制器，去定义pod模板，pod按照这个模板去运行
- deployment控制器
- DaemonSet
二 详解rs控制器原理
RS控制器原理：副本数保障、标签选择器
2.1 创建RS控制器
[root@k8s-master ~]# cat rs-nginx.yml
apiVersion: apps/v1
kind: ReplicaSet
metadata:name: nginx-rsnamespace: lxyspec:replicas: 3selector:matchLabels:app: nginxtemplate:metadata:name: nginx-podlabels:app: nginxspec:containers:- name: nginx-containersimage: nginx:1.14.0imagePullPolicy: IfNotPresentports:- name: httpcontainerPort: 80
kubectl create -f rs-nginx.yml
kubectl -n lxy get rs -owide
kubectl -n lxy get pods -l app=nginx -owide 
2.2 删除Pod,查看rs如何保障副本数
删掉一个pod,但是会马上创建一个
2.3 pod和rs关系
kubectl -n lxy describe rs nginx-rs
2.4 修改RS控制器
1.对yaml修改副本数，修改资源配置：kubectl apply -f rs-nginx.yml
2.编辑RS控制器：kubectl -n lxy edit rs nginx-rs (有些是无法修改)
三 Deploy控制器与弹性扩缩容
kubectl scale --help
kubectl -n lxy scale --replicas=X rs nginx-rs
root@k8s-master ~]# kubectl -n lxy get pods -owide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-2 1/1 Running 2 5d17h 10.2.20.143 k8s-node13 <none> <none>
nginx-rs-2zhzn 1/1 Running 0 7h25m 10.2.231.96 k8s-node12 <none> <none>
nginx-rs-7p64w 1/1 Running 0 7h25m 10.2.20.146 k8s-node13 <none> <none>
[root@k8s-master ~]# kubectl -n lxy scale --replicas=4 rs nginx-rs
replicaset.apps/nginx-rs scaled
[root@k8s-master ~]# kubectl -n lxy get pods -owide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-2 1/1 Running 2 5d17h 10.2.20.143 k8s-node13 <none> <none>
nginx-rs-2zhzn 1/1 Running 0 7h34m 10.2.231.96 k8s-node12 <none> <none>
nginx-rs-7p64w 1/1 Running 0 7h34m 10.2.20.146 k8s-node13 <none> <none>
nginx-rs-8jf8p 1/1 Running 0 4s 10.2.20.150 k8s-node13 <none> <none>
nginx-rs-k9dvr 1/1 Running 0 4s 10.2.20.149 k8s-node13 <none> <none>
[root@k8s-master ~]# kubectl -n lxy scale --replicas=2 rs nginx-rs
replicaset.apps/nginx-rs scaled
[root@k8s-master ~]# kubectl -n lxy get pods -owide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-2 1/1 Running 2 5d17h 10.2.20.143 k8s-node13 <none> <none>
nginx-rs-2zhzn 1/1 Running 0 7h34m 10.2.231.96 k8s-node12 <none> <none>
nginx-rs-7p64w 1/1 Running 0 7h34m 10.2.20.146 k8s-node13 <none> <none>
nginx-rs-8jf8p 0/1 Terminating 0 12s 10.2.20.150 k8s-node13 <none> <none>
nginx-rs-k9dvr 0/1 Terminating 0 12s 10.2.20.149 k8s-node13 <none> <none>
获取当前rs资源的Yaml: kubectl -n lxy get rs nginx-rs -oyaml
四 Deploy与rs原理
Deployments | Kubernetes
kubectl -n kube-system get deploy coredns -o yaml
[root@k8s-master ~]# cat deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:name: nginx-deploymentnamespace: lxy
spec:replicas: 2selector:matchLabels:app: nginxtemplate:metadata:labels:app: nginxspec:containers:- name: nginximage: nginx:1.14.2ports:- containerPort: 80resources:limits:cpu: 100mmemory: 200Mirequests:cpu: 100mmemory: 200Mi
[root@k8s-master ~]# kubectl get deployments.apps -owide -n lxy
NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR
nginx-deployment 2/2 2 2 110s nginx nginx:1.14.2 app=nginx
[root@k8s-master ~]# kubectl get rs -n lxy
NAME DESIRED CURRENT READY AGE
nginx-deployment-58df99679c 2 2 2 115s
nginx-rs 2 2 2 8h
[root@k8s-master ~]# kubectl get pods -l app=nginx -n lxy
NAME READY STATUS RESTARTS AGE
nginx-deployment-58df99679c-tqxps 1/1 Running 0 119s
nginx-deployment-58df99679c-zhvcj 1/1 Running 0 119s
nginx-rs-2zhzn 1/1 Running 0 8h
nginx-rs-7p64w 1/1 Running 0 8h
pod和rs和deployment关系
kubectl describe pods nginx-deployment-AAA-XX
kubectl describe rs nginx-deployment-AAA
五 滚动更新详解原理
蓝绿更新：起一个新的Pod+删除一个旧pod,接替就是滚动更新
六 更新镜像版本其他玩法
1.kubectl edit rs资源
2.kubectl scale --replicas=xxx rs rs名
3.edit 编辑deployment资源
4.deployment提供了 修改镜像版本 参数 kubectl set image
七 版本更新与回滚详解
因为rs控制器还在，数据还在 kubectl get rs -owide -w / kubectl get rs -owide -n lxy
#查看版本是1.14.2
kubectl get deployments.apps -n lxy -owide
#修改版本为1.14.1
kubectl -n lxy set image deployment nginx-deployment nginx=nginx:1.14.1
#这时候在查看是1.14.1，使用命令回归后，恢复成1.14.2
kubectl rollout undo deployment nginx-deployment -n lxy八 详解版本记录号玩法
1.kubectl create -f last-deploy-nginx.yml --record ----创建的时候，记录版本号
2.查看deploy版本信息
kubectl rollout history deployment last-nginx-deployment
kubectl rollout status deployment last-nginx-deployment
kubectl rollout history deployment last-nginx-deployment --revision=2（指定那个版本的镜像信息）
3.指定回滚到哪个版本
kubectl rollout undo deployment last-nginx-deployment --to-revision=1