1 在k8s中部署的难点
在k8s中部署nacos集群和在裸机器上直接部署nacos机器其实差别不大。
最主要的区别是k8s中部署的服务没有固定的ip地址，而nacos集群部署需要配置所有实例的ip
2 解决
在k8s中通过StatefulSet和Headless Service为每个nacos实例生成一个唯一的dns地址，
创建一个普通Service给可客户端使用
版本： nacos1.4.0
前提前提条件：
mysql
Ingress Controller (用于ingress暴露方式)
具体实现如下。
3 实现方式
3.1 创建数据库配置
vim nacos-mysql-config.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: nacos-cm
data:
mysql.host: "192.168.1.211"
mysql.db.name: "nacos_config"
mysql.port: "12345"
mysql.user: "root"
mysql.password: "root"
kubectl apply -f nacos-mysql-config.yaml
注意：我是直接现有mysql的nacos库，如果要新建数据库必须先在数据库新建名称为nacos_config的库并导入对应nacos1.4.0下config/nacos-mysql.sql脚本导入到nacos_config库
3.2 部署Headless Service
Headless Service为每个pod（nacos实例）生成一个DNS地址，用作NACOS_SERVERS配置
vim nacos-headless.yaml
apiVersion: v1
kind: Service
metadata:
name: nacos-headless
labels:
app: nacos
annotations:
service.alpha.kubernetes.io/tolerate-unready-endpoints: "true"
spec:
ports:
- port: 8848
name: server
targetPort: 8848
clusterIP: None
selector:
app: nacos
kubectl apply -f nacos-headless.yaml
3.3 通过StatefulSet部署nacos
StatefulSet部署方式为每个POD生成固定的名称，如nacos-0、nacos-1、nacos-2等。
vim nacos-StatefulSet.yaml
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: nacos
spec:
serviceName: nacos-headless
replicas: 3
template:
metadata:
labels:
app: nacos
annotations:
pod.alpha.kubernetes.io/initialized: "true"
spec:
affinity:
podAntiAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
- labelSelector:
matchExpressions:
- key: "app"
operator: In
values:
- nacos-headless
topologyKey: "kubernetes.io/hostname"
containers:
- name: k8snacos
imagePullPolicy: Always
image: nacos/nacos-server:1.4.0
resources:
requests:
memory: "2Gi"
cpu: "500m"
ports:
- containerPort: 8848
name: client
env:
- name: NACOS_REPLICAS
value: "3"
- name: MYSQL_SERVICE_HOST
valueFrom:
configMapKeyRef:
name: nacos-cm
key: mysql.host
- name: MYSQL_SERVICE_DB_NAME
valueFrom:
configMapKeyRef:
name: nacos-cm
key: mysql.db.name
- name: MYSQL_SERVICE_PORT
valueFrom:
configMapKeyRef:
name: nacos-cm
key: mysql.port
- name: MYSQL_SERVICE_USER
valueFrom:
configMapKeyRef:
name: nacos-cm
key: mysql.user
- name: MYSQL_SERVICE_PASSWORD
valueFrom:
configMapKeyRef:
name: nacos-cm
key: mysql.password
- name: MODE
value: "cluster"
- name: NACOS_SERVER_PORT
value: "8848"
- name: PREFER_HOST_MODE
value: "hostname"
- name: NACOS_SERVERS
value: "nacos-0.nacos-headless.default.svc.cluster.local:8848 nacos-1.nacos-headless.default.svc.cluster.local:8848 nacos-2.nacos-headless.default.svc.cluster.local:8848"
selector:
matchLabels:
app: nacos
kubectl apply -f nacos-StatefulSet.yaml
3.4 部署普通Service
apiVersion: v1
kind: Service
metadata:
name: nacos-service
namespace: default
annotations:
nginx.ingress.kubernetes.io/affinity: "true"
nginx.ingress.kubernetes.io/session-cookie-name: backend
nginx.ingress.kubernetes.io/load-balancer-method: drr
spec:
selector:
app: nacos
ports:
- name: web
port: 80
targetPort: 8848
nodePort: 8848
type: NodePort
kubectl apply -f nacos-service.yaml
或者使用下面的ingress，也可以一起使用---------------------------------------------------------------------------------------------------
3.5 配置Ingress
vim ingress-nacos.yaml
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: nacos-web
namespace: default
spec:
rules:
- host: nacos-web.nacos-demo.com
http:
paths:
- path: /
backend:
serviceName: nacos-service
servicePort: web
kubectl apply -f ingress-nacos.yaml
结果图
最后，想通过域名 nacos-web.nacos-demo.com 可以访问，需要在dns服务器解析域名或者本地wind的hosts添加本地解析
访问
nacos-web.nacos-demo.com/nacos
或者
参考：https://blog.csdn.net/u011936655/article/details/108364176