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1. 头疼编写K8S部署文件？
   K8S yaml 参数很多，需要边写边查？
   保留回滚版本数怎么设？
   如何探测启动成功，如何探活？
   如何分配和限制资源？
   如何设置时区？否则打印日志是GMT标准时间
   如何暴露服务供其它服务调用？
   如何根据CPU和内存使用率来配置水平伸缩？
   首先，你需要知道有这些知识点，其次要把这些知识点都搞明白也不容易，再次，每次编写依然容易出错！

2. 创建服务镜像
   前一篇文章 讲解了如何快速创建自己的服务镜像，不过为了演示，这篇文章我们以 redis:6-alpine 镜像为例。

3. 完整K8S部署文件编写过程
   首先安装 goctl 工具

GO111MODULE=on GOPROXY=https://goproxy.cn/,direct go get -u github.com/tal-tech/go-zero/tools/goctl

一键生成K8S部署文件

goctl kube deploy -name redis -namespace adhoc -image redis:6-alpine -o redis.yaml -port 6379

生成的 yaml 文件如下：

apiVersion: apps/v1
kind: Deployment
metadata:
name: redis
namespace: adhoc
labels:
app: redis
spec:
replicas: 3
revisionHistoryLimit: 5
selector:
matchLabels:
app: redis
template:
metadata:
labels:
app: redis
spec:
containers:
- name: redis
image: redis:6-alpine
lifecycle:
preStop:
exec:
command: [“sh”,"-c",“sleep 5”]
ports:
- containerPort: 6379
readinessProbe:
tcpSocket:
port: 6379
initialDelaySeconds: 5
periodSeconds: 10
livenessProbe:
tcpSocket:
port: 6379
initialDelaySeconds: 15
periodSeconds: 20
resources:
requests:
cpu: 500m
memory: 512Mi
limits:
cpu: 1000m
memory: 1024Mi
volumeMounts:
- name: timezone
mountPath: /etc/localtime
volumes:
- name: timezone
hostPath:
path: /usr/share/zoneinfo/Asia/Shanghai

---

apiVersion: v1
kind: Service
metadata:
name: redis-svc
namespace: adhoc
spec:
ports:
- port: 6379
selector:
app: redis

---

apiVersion: autoscaling/v2beta1
kind: HorizontalPodAutoscaler
metadata:
name: redis-hpa-c
namespace: adhoc
labels:
app: redis-hpa-c
spec:
scaleTargetRef:
apiVersion: apps/v1
kind: Deployment
name: redis
minReplicas: 3
maxReplicas: 10
metrics:

• type: Resource
  resource:
  name: cpu
  targetAverageUtilization: 80

---

apiVersion: autoscaling/v2beta1
kind: HorizontalPodAutoscaler
metadata:
name: redis-hpa-m
namespace: adhoc
labels:
app: redis-hpa-m
spec:
scaleTargetRef:
apiVersion: apps/v1
kind: Deployment
name: redis
minReplicas: 3
maxReplicas: 10
metrics:

• type: Resource
  resource:
  name: memory
  targetAverageUtilization: 80
  部署服务，如果 adhoc namespace不存在的话，请先通过 kubectl create namespace adhoc 创建

$ kubectl apply -f redis.yaml
deployment.apps/redis created
service/redis-svc created
horizontalpodautoscaler.autoscaling/redis-hpa-c created
horizontalpodautoscaler.autoscaling/redis-hpa-m created
查看服务允许状态

$ kubectl get all -n adhoc
NAME READY STATUS RESTARTS AGE
pod/redis-585bc66876-5ph26 1/1 Running 0 6m5s
pod/redis-585bc66876-bfqxz 1/1 Running 0 6m5s
pod/redis-585bc66876-vvfc9 1/1 Running 0 6m5s

NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/redis-svc ClusterIP 172.24.15.8 6379/TCP 6m5s

NAME READY UP-TO-DATE AVAILABLE AGE
deployment.apps/redis 3/3 3 3 6m6s

NAME DESIRED CURRENT READY AGE
replicaset.apps/redis-585bc66876 3 3 3 6m6s

NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE
horizontalpodautoscaler.autoscaling/redis-hpa-c Deployment/redis 0%/80% 3 10 3 6m6s
horizontalpodautoscaler.autoscaling/redis-hpa-m Deployment/redis 0%/80% 3 10 3 6m6s
测试服务

$ kubectl run -i --tty --rm cli --image=redis:6-alpine -n adhoc – sh
/data # redis-cli -h redis-svc
redis-svc:6379> set go-zero great
OK
redis-svc:6379> get go-zero
“great”