前言
最近在学习如何应用k8s搭建nacos服务以及如何应用，记录下来分享给大家。
筹备工作
- K8S：我应用的是阿里云ACK(阿里的k8s服务)，
Nacos：因为我应用的是阿里云RDS的mysql，所以 用的是nacos-group/nacos-k8s的nacos-no-pvc-ingress.yaml文件
开始搭建
首先咱们来查看nacos-no-pvc-ingress.yaml文件
###应用自建数据库；应用Ingress公布配置后盾###---apiVersion: v1kind: Servicemetadata:name: nacos-headlesslabels: app: nacos-headlessspec:type: ClusterIPclusterIP: Noneports: - port: 8848 name: server targetPort: 8848 - port: 9848 name: client-rpc targetPort: 9848 - port: 9849 name: raft-rpc targetPort: 9849 ## 兼容1.4.x版本的选举端口 - port: 7848 name: old-raft-rpc targetPort: 7848selector: app: nacos---apiVersion: v1kind: ConfigMapmetadata:name: nacos-cmdata:mysql.host: "10.127.1.12"mysql.db.name: "nacos_devtest"mysql.port: "3306"mysql.user: "nacos"mysql.password: "passwd"---apiVersion: apps/v1kind: StatefulSetmetadata:name: nacosspec:serviceName: nacos-headlessreplicas: 3template: metadata: labels: app: nacos annotations: pod.alpha.kubernetes.io/initialized: "true" spec: affinity: podAntiAffinity: requiredDuringSchedulingIgnoredDuringExecution: - labelSelector: matchExpressions: - key: "app" operator: In values: - nacos topologyKey: "kubernetes.io/hostname" containers: - name: k8snacos imagePullPolicy: Always image: nacos/nacos-server:latest resources: requests: memory: "2Gi" cpu: "500m" ports: - containerPort: 8848 name: client - containerPort: 9848 name: client-rpc - containerPort: 9849 name: raft-rpc - containerPort: 7848 name: old-raft-rpc 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---# ------------------- App Ingress ------------------- #apiVersion: extensions/v1beta1kind: Ingressmetadata:name: nacos-headlessnamespace: defaultspec:rules:- host: nacos-web.nacos-demo.com http: paths: - path: / backend: serviceName: nacos-headless servicePort: server
接着咱们改改下面的配置文件变成咱们本人的。
- 1、ingress反对https，这里有篇应用cert-manager申请收费的HTTPS证书具体过程就不叙述了，过程为：
- 部署cert-manager
- 创立ClusterIssuer
- 创立Ingress资源对象
- 2、ingress配置http 主动跳转到https，应用
nginx.ingress.kubernetes.io/force-ssl-redirect: 'true'注解 - 3、ConfigMap配置本人的Mysql地址和明码
- 4、StatefulSet集群模式下配置正本数replicas至多为2，否则不起作用
- 5、StatefulSet设置内存、CPU和模式
内存、CPU：
- name: k8snacos imagePullPolicy: Always image: nacos/nacos-server:latest resources: requests: memory: "256Mi" cpu: "250m"模式：
- name: MODE # 单机部署，value: "standalone" # 集群部署，value: "cluster" value: "cluster" 其余的都不必变，如下所示 ：
#参考：/Users/zhangwei/Development/com.github/nacos-k8s/deploy/nacos/nacos-no-pvc-ingress.yamlapiVersion: extensions/v1beta1kind: Ingressmetadata: name: nacos-headless namespace: default annotations: kubernetes.io/ingress.class: nginx # 增加cert-manager.io/cluster-issuer注解 cert-manager.io/cluster-issuer: "letsencrypt-prod-http01" nginx.ingress.kubernetes.io/service-weight: '' nginx.ingress.kubernetes.io/force-ssl-redirect: 'true'spec: # 增加ssl证书 tls: - hosts: # 替换为您的域名 - baidu.com secretName: server-seaurl-tls rules: - host: baidu.com http: paths: - path: /nacos backend: serviceName: nacos-headless servicePort: server---apiVersion: v1kind: Servicemetadata: name: nacos-headless labels: app: nacos-headlessspec: type: ClusterIP # headless service clusterIP: None ports: - port: 8848 name: server targetPort: 8848 - port: 9848 name: client-rpc targetPort: 9848 - port: 9849 name: raft-rpc targetPort: 9849 ## 兼容1.4.x版本的选举端口 - port: 7848 name: old-raft-rpc targetPort: 7848 selector: app: nacos---apiVersion: v1kind: ConfigMapmetadata: name: nacos-cmdata: mysql.host: "your-aliyun-rds-host" mysql.db.name: "nacos" mysql.port: "3306" mysql.user: "username" mysql.password: "password"---apiVersion: apps/v1kind: StatefulSetmetadata: name: nacosspec: serviceName: nacos-headless # 单机模式设置成1，集群模式设置成3 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 topologyKey: "kubernetes.io/hostname" containers: - name: k8snacos imagePullPolicy: Always image: nacos/nacos-server:latest resources: requests: memory: "256Mi" cpu: "250m" ports: - containerPort: 8848 name: client - containerPort: 9848 name: client-rpc - containerPort: 9849 name: raft-rpc - containerPort: 7848 name: old-raft-rpc env: - name: NACOS_REPLICAS # 单机模式设置成1，集群模式设置成3 value: "3" - name: MYSQL_SERVICE_HOST # 增加 mysql 拜访地址的环境变量 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: NACOS_SERVER_PORT value: "8848" - name: NACOS_APPLICATION_PORT value: "8848" - name: PREFER_HOST_MODE value: "hostname" - name: NACOS_SERVERS # 单机模式设置成nacos-0.xxxx,集群模式要增加：nacos-1.xxxx和nacos-2.xxxxx 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" - name: MODE # 单机部署，value: "standalone" # 集群部署，value: "cluster" value: "cluster" selector: matchLabels: app: nacos而后执行命令来创立Nacos服务：
kubectl apply -f nacos.yaml通过命令查看是否胜利
kubectl get StatefulSetkubectl get ingresskubectl get svckubectl get pod
从图中能够看出部署nacos服务胜利，咱们拜访试试：
总结
1、首先咱们理解下什么是Service headless，就是type: ClusterIP且clusterIP: None的Service，所以只能通过dns对外去拜访你的服务nacos-headless，
2、单机模式没有应用过，大家能够试试
注意事项
1、如果集群模式下只有一个正本会呈现问题，至多两个正本
援用
应用cert-manager申请收费的HTTPS证书
K8S部署Nacos微服务
k8s部署单节点nacos报错 server is DOWN now, please try again later! 解决
在 Kubernetes 中应用 DNS 和 Headless Service 发现运行中的 Pod
K8S容器编排之Headless浅谈