环境
centos 7
一、Kubernetes分布式集群架构
1、Kubernetes服务注册和服务发现问题怎么解决的？
每个服务分配一个不变的虚拟IP+端口， 系统env环境变量里有每个服务的服务名称到IP的映射。
2、服务的负载均衡问题怎么解决的？
每个节点上都有一个软件实现的服务代理来实现负载均衡
3、服务的规模部署问题怎么解决的？
目标导向的做法：确定部署实例数，系统自动调度
4、服务运维问题如何解决的？
自动监控、自我修复
5、集中配置，并且实时配置实施生效
二、集群架构示例
1、示例
一个PHP做的留言板：3台webserver做PHP-Frontend前台，1台redis-master用来写,2台redis-slave做读。
2、集群搭建图
创建三个service：frontend Service、redis-master Service、redis-slave Service
三、搭建
1、创建redis-master Pod
(1)定义redis-master-controller.yaml文件：
[root@node106 ~]# vi redis-master-controller.yaml apiVersion: v1 kind: ReplicationController metadata: name: redis-master labels: name: redis-master spec: replicas: 1 selector: name: redis-master template: metadata: labels: name: redis-master spec: containers: - name: master image: kubeguide/redis-master ports: - containerPort: 6379
(2)执行创建命令
[root@node106 ~]# kubectl create -f redis-master-controller.yaml
replicationcontroller/redis-master created
(3)查看pod
[root@node106 ~]# kubectl get pods NAME READY STATUS RESTARTS AGE redis-master-659bm 1/1 Running 0 4m46s
2、创建redis-master 服务
(1)定义redis-master-service.yaml
[root@node106 ~]# vi redis-master-service.yaml apiVersion: v1 kind: Service metadata: name: redis-master labels: name: redis-master spec: ports: - port: 6379 targetPort: 6379 selector: name: redis-master
(2)执行创建命令
[root@node106 ~]# kubectl create -f redis-master-service.yaml
service/redis-master created
(3)查看服务
[root@node106 ~]# kubectl get services NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 46h redis-master ClusterIP 10.96.187.196 <none> 6379/TCP 18s
3、创建redis-slave Pod
(1)创建redis-slave-controller.yaml
[root@node106 ~]# vi redis-slave-controller.yaml apiVersion: v1 kind: ReplicationController metadata: name: redis-slave labels: name: redis-slave spec: replicas: 2 selector: name: redis-slave template: metadata: labels: name: redis-slave spec: containers: - name: slave image: kubeguide/guestbook-redis-slave env: - name: GET_HOSTS_FROM value: env ports: - containerPort: 6379
(2)执行创建命令
[root@node106 ~]# kubectl create -f redis-slave-controller.yaml
replicationcontroller/redis-slave created
(3)查看pod和rc
[root@node106 ~]# kubectl get pods NAME READY STATUS RESTARTS AGE redis-master-659bm 1/1 Running 0 16m redis-slave-kqllg 1/1 Running 0 119s redis-slave-rfbr8 1/1 Running 0 119s [root@node106 ~]# kubectl get rc NAME DESIRED CURRENT READY AGE redis-master 1 1 1 17m redis-slave 2 2 2 2m24s
4、创建redis-slave 服务
(1)创建redis-slave-service.yaml
[root@node106 ~]# vi redis-slave-service.yaml apiVersion: v1 kind: Service metadata: name: redis-slave labels: name: redis-slave spec: ports: - port: 6379 selector: name: redis-slave
(2)执行创建命令
[root@node106 ~]# kubectl create -f redis-slave-service.yaml
service/redis-slave created
(3)查看服务
[root@node106 ~]# kubectl get services NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 46h redis-master ClusterIP 10.96.187.196 <none> 6379/TCP 11m redis-slave ClusterIP 10.99.146.233 <none> 6379/TCP 33s
5、创建frontend Pod
(1)创建frontend-controller.yaml
[root@node106 ~]# vi frontend-controller.yaml apiVersion: v1 kind: ReplicationController metadata: name: frontend labels: name: frontend spec: replicas: 3 selector: name: frontend template: metadata: labels: name: frontend spec: containers: - name: frontend image: kubeguide/guestbook-php-frontend env: - name: GET_HOSTS_FROM value: env ports: - containerPort: 80
(2)执行创建命令
[root@node106 ~]# kubectl create -f frontend-controller.yaml
replicationcontroller/frontend created
(3)查看pod
[root@node106 ~]# kubectl get pods NAME READY STATUS RESTARTS AGE curl-6bf6db5c4f-dn65h 1/1 Running 2 41h frontend-jjpzd 1/1 Running 0 6m50s frontend-p2jpn 1/1 Running 0 6m50s frontend-rm4z4 1/1 Running 0 6m50s redis-master-659bm 1/1 Running 0 30m redis-slave-kqllg 1/1 Running 0 15m redis-slave-rfbr8 1/1 Running 0 15m
6、创建frontend 服务
(1)创建frontend-service.yaml
[root@node106 ~]# vi frontend-service.yaml apiVersion: v1 kind: Service metadata: name: frontend labels: name: frontend spec: type: NodePort ports: - port: 80 nodePort: 30001 selector: name: frontend
(2)执行创建命令
[root@node106 ~]# kubectl create -f frontend-service.yaml
service/frontend created
(3)查看服务
[root@node106 ~]# kubectl get services NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE frontend NodePort 10.110.39.201 <none> 80:30001/TCP 34s kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 46h redis-master ClusterIP 10.96.187.196 <none> 6379/TCP 24m redis-slave ClusterIP 10.99.146.233 <none> 6379/TCP 13m
验证：
