前言：
后端小伙伴们准备搞pvp对战服务。配置中心选型选择了阿里云的nacos服务。参照https://nacos.io/zh-cn/docs。由于业务规划都在kubernetes集群上，就简单参照https://nacos.io/zh-cn/docs/use-nacos-with-kubernetes.html做了一个demo让他们先玩一下。
关于nacos:
参照：https://nacos.io/zh-cn/docs/what-is-nacos.html
- 服务发现和健康监测： 支持基于 DNS 和基于 RPC 的服务发现。服务提供者使用 原生SDK、OpenAPI、或一个独立的Agent TODO注册 Service 后，服务消费者可以使用DNS TODO 或HTTP&API查找和发现服务。提供对服务的实时的健康检查，阻止向不健康的主机或服务实例发送请求
- 动态配置服务： Nacos 提供配置统一管理功能，能够帮助我们将配置以中心化、外部化和动态化的方式管理所有环境的应用配置和服务配置。
- 动态 DNS 服务： Nacos 支持动态 DNS 服务权重路由，能够让我们很容易地实现中间层负载均衡、更灵活的路由策略、流量控制以及数据中心内网的简单 DNS 解析服务。
- 服务及其元数据管理： Nacos 支持从微服务平台建设的视角管理数据中心的所有服务及元数据，包括管理服务的描述、生命周期、服务的静态依赖分析、服务的健康状态、服务的流量管理、路由及安全策略、服务的 SLA 以及最首要的 metrics 统计数据。
- 嗯 还有更多的特性列表…
一. nacos on kubernetes
基本的安装过程参照：https://github.com/nacos-group/nacos-k8s/blob/master/README-CN.md
1. 创建命名空间
嗯当然了第一步还是先创建一个搭建nacos服务的namespace了：
kubectl create ns nacos 2. git clone 仓库
git clone https://github.com/nacos-group/nacos-k8s.git 基本都会因为网络原因无法clone,我是直接下载包到本地 然后上传到服务器了。
3. 部署初始化mysql服务器
生产的话肯定是用云商的云数据库了，比如腾讯云的rds服务。由于只是给程序整一个demo让他们玩一下，就讲mysql 整合在kubernetes中了。个人存储storageclass都是使用默认的腾讯云的cbs-csi。
cd /nacos-k8s/mysql(当然了我是上传的目录路径是/root/nacos/nacos-k8s-master/deploy/mysql**)**
1. 部署mysql服务
cat pvc.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: nacos-mysql-pvc
namespace: nacos
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 10Gi
storageClassName: cbs-csi mysql的部署文件直接复制了mysql-ceph.yaml的修改了一下：
cat mysql.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: nacos-mysql-pvc
namespace: nacos
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 10Gi
storageClassName: cbs-csi
[root@sh-master-01 mysql]# cat mysql.yaml
apiVersion: v1
kind: ReplicationController
metadata:
name: mysql
labels:
name: mysql
spec:
replicas: 1
selector:
name: mysql
template:
metadata:
labels:
name: mysql
spec:
containers:
- name: mysql
image: nacos/nacos-mysql:5.7
ports:
- containerPort: 3306
env:
- name: MYSQL_ROOT_PASSWORD
value: "root"
- name: MYSQL_DATABASE
value: "nacos_devtest"
- name: MYSQL_USER
value: "nacos"
- name: MYSQL_PASSWORD
value: "nacos"
volumeMounts:
- name: mysql-persistent-storage
mountPath: /var/lib/mysql
subPath: mysql
readOnly: false
volumes:
- name: mysql-persistent-storage
persistentVolumeClaim:
claimName: nacos-mysql-pvc
---
apiVersion: v1
kind: Service
metadata:
name: mysql
labels:
name: mysql
spec:
ports:
- port: 3306
targetPort: 3306
selector:
name: mysql kubectl apply -f pvc.yaml
kubectl apply -f mysql.yaml -n nacos
kubectl get pods -n nacos 等待mysql pods running
$kubectl get pods -n nacos
NAME READY STATUS RESTARTS AGE
mysql-hhs5q 1/1 Running 0 3h51m 2. 进入mysql 容器执行初始化脚本
kubectl exec -it mysql-hhs5q bash -n nacos
mysql -uroot -p root *****
create database nacos_devtest;
use nacos_devtest;
### 我是图省事，把这sql脚本里面直接复制进去搞了...
https://github.com/alibaba/nacos/blob/develop/distribution/conf/nacos-mysql.sql
-------
退出mysql控制台，并退出容器
quit;
exit 4. 部署nacos
从mysql目录 cd …/nacos
cat nacos.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
- port: 7848
name: rpc
targetPort: 7848
clusterIP: None
selector:
app: nacos
---
apiVersion: v1
kind: ConfigMap
metadata:
name: nacos-cm
data:
mysql.db.name: "nacos_devtest"
mysql.port: "3306"
mysql.user: "nacos"
mysql.password: "nacos"
---
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
topologyKey: "kubernetes.io/hostname"
initContainers:
- name: peer-finder-plugin-install
image: nacos/nacos-peer-finder-plugin:1.0
imagePullPolicy: Always
volumeMounts:
- mountPath: /home/nacos/plugins/peer-finder
name: plguindir
containers:
- name: nacos
imagePullPolicy: Always
image: nacos/nacos-server:latest
resources:
requests:
memory: "2Gi"
cpu: "500m"
ports:
- containerPort: 8848
name: client-port
- containerPort: 7848
name: rpc
env:
- name: NACOS_REPLICAS
value: "2"
- name: SERVICE_NAME
value: "nacos-headless"
- name: DOMAIN_NAME
value: "layabox.daemon"
- name: POD_NAMESPACE
valueFrom:
fieldRef:
apiVersion: v1
fieldPath: metadata.namespace
- 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"
volumeMounts:
- name: plguindir
mountPath: /home/nacos/plugins/peer-finder
- name: datadir
mountPath: /home/nacos/data
- name: logdir
mountPath: /home/nacos/logs
volumeClaimTemplates:
- metadata:
name: plguindir
spec:
accessModes: [ "ReadWriteOnce" ]
storageClassName: "cbs-csi"
resources:
requests:
storage: 10Gi
- metadata:
name: datadir
spec:
accessModes: [ "ReadWriteOnce" ]
storageClassName: "cbs-csi"
resources:
requests:
storage: 10Gi
- metadata:
name: logdir
spec:
accessModes: [ "ReadWriteOnce" ]
storageClassName: "cbs-csi"
resources:
requests:
storage: 10Gi
selector:
matchLabels:
app: nacos 主要就是修改了storageclassName为 cbs-csi。并修改了accessmodes,还有DOMAIN_NAME变量修改为自己命名的集群后缀.简单demo不做详细论述。
kubectl apply -f nacos.yaml -n nacos 等待服务running
5. 对外暴露服务
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: nacos-headless-http
namespace: nacos
annotations:
kubernetes.io/ingress.class: traefik
traefik.ingress.kubernetes.io/router.entrypoints: web
spec:
rules:
- host: nacos-server.saynaihe.com
http:
paths:
- pathType: Prefix
path: /
backend:
service:
name: nacos-headless
port:
number: 8848 ![深入理解Kubernetes资源限制：内存深入理解Kubernetes资源限制：内存[图]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)