创建一个web.yaml
---
apiVersion: v1
kind: Service
metadata:
name: nginx
labels:
app: nginx
spec:
ports:
- port: 80
name: web
clusterIP: None
selector:
app: nginx
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: web
spec:
serviceName: "nginx" # 使用那个service来管理dns
replicas: 2
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:latest
ports: # 容器暴露的端口
- containerPort: 80 # 具体暴露的端口号
name: web #该端口配置的名字
# volumeMounts:
# - name: www #指定加载那个数据券
# mountPath: /usr/share/nginx/html #加载到容器中的那个目录
操作步骤如下:
# 创建
kubectl create sts -f web.yaml
# 查看
kubeclt get sts,svc,po
# 查看ip信息
kubectl run -it --image busybox:1.28.4 dns-test /bin/sh
nslookup web-0.nginx
#打印信息如下
Server: 10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local
Name: web-0.nginx
Address 1: 10.244.107.210 web-0.nginx.default.svc.cluster.local
# 扩容,缩容 两种方式,选择其一
kubectl scale statefulset web --replicas=5
kubectl patch statefulset web -p '{"spec":{"replicas":2}}'
# 查看描述信息
kubectl descrbe sts web
...
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal SuccessfulCreate 28m statefulset-controller create Pod web-0 in StatefulSet web successful
Normal SuccessfulCreate 27m statefulset-controller create Pod web-1 in StatefulSet web successful
Normal SuccessfulCreate 9m13s statefulset-controller create Pod web-2 in StatefulSet web successful
Normal SuccessfulCreate 8m52s statefulset-controller create Pod web-3 in StatefulSet web successful
Normal SuccessfulCreate 8m32s statefulset-controller create Pod web-4 in StatefulSet web successful
Normal SuccessfulDelete 6m28s statefulset-controller delete Pod web-4 in StatefulSet web successful
Normal SuccessfulDelete 6m25s statefulset-controller delete Pod web-3 in StatefulSet web successful
Normal SuccessfulDelete 6m23s statefulset-controller delete Pod web-2 in StatefulSet web successful
镜像更新
bash
kubectl patch sts web --type='json' -p='[{"op":"replace","path":"/spec/template/spec/containers/0/image","value":"nginx:latest"}]'
# 这里有可能报错,那就把 "nginx:1.9.1" 改为 "nginx:1.26" 请注意到hub.docker.net去查看对应的版本
查看更新记录
bash
# 查看所有
kubectl rollout history sts web
# 结果
statefulset.apps/web
REVISION CHANGE-CAUSE
1 <none>
2 <none>
# 指定查看对应的版本
kubectl rollout history sts web --revision=2
# 结果
statefulset.apps/web with revision #2
Pod Template:
Labels: app=nginx
Containers:
nginx:
Image: nginx:1.9.1
Port: 80/TCP
Host Port: 0/TCP
Environment: <none>
Mounts: <none>
Volumes: <none>
# 查看状态
kubectl rollout status sts web
灰度发布
利用滚动更新中的partition 属性,可以实现简易的灰度发布效果
简介:加入我们有5个pod,如果当partition设置为3,那么此时滚动更新是,只会更新需要>=3的pod,利用该机制,我们可以通过控制partion来决定更新那一部分的内容,确定没有问题后,在逐渐增大更新pod的数量;如果partition为0 ,那表示所有的都更新
bash
# 修改sts配置文件
kubectl edit sts web
# 修改partition:3 和 nignx:latest
# 保存退出,通过kubectl describe po web-4 和 web-0 就能看到效果
StatefulSet的删除
bash
# 练级删除 会删除sts和pod
kubectl delete sts web
# 非联级删除
kubectl delete sts web --cascade=false
# 删除services
kubectl delete svc nginx