容器基础(十): 使用kubernetes部署应用

概述

使用之前的脚本(env/server.py 得到 env/server:v0.1 镜像, env/worker.py 得到 env/worker:v0.1)得到的镜像，在部署好kubernetes的机器上进行测试。kubernetes-v1.12.2当前只部署在master上，且master的Taint已经被删除！基本的做法是：

1. 配置一个server-rc.yml, 用于创建server端，全局只配置一个replicas;
2. 配置一个server-svc.yml, 与server-rc.yml进行关联, 为server端分配VIP;
3. 配置一个worker-rc.yml, 用于创建客户端, 可配置多个replicas, 用于和server进行通信;

 

YAML脚本

 1 ➜  k8s  cat server-rc.yml 
 2 apiVersion: v1
 3 kind: ReplicationController
 4 metadata:
 5   name: server
 6 spec:
 7   replicas: 1
 8   selector:
 9     app: server
10   template:
11     metadata:
12       labels:
13         app: server
14     spec:
15       containers:
16         - name: server
17           image: env/server:v0.1
18           ports:
19           - containerPort: 3000
20           env:
21           - name: APP_PORT
22             value: "3000"
23 ➜  k8s  
 1 ➜  k8s  cat server-svc.yml 
 2 apiVersion: v1
 3 kind: Service
 4 metadata:
 5   name: server
 6 spec:
 7   ports:
 8     - port: 3000
 9   selector:
10     app: server
11 ➜  k8s  
 1 ➜  k8s  cat worker-rc.yml 
 2 apiVersion: v1
 3 kind: ReplicationController
 4 metadata:
 5   name: worker
 6 spec:
 7   replicas: 2
 8   selector:
 9     app: worker
10   template:
11     metadata:
12       labels:
13         app: worker
14     spec:
15       containers:
16         - name: worker
17           image: env/worker:v0.1
18           ports:
19           - containerPort: 3000
20           env:
21           - name: APP_DOMAIN
22             value: "server"   # 传入service名字，后续脚本通过该名字从k8s获取到VIP
23           - name: APP_PORT
24             value: "3000"
25 ➜  k8s

 

部署验证

根据yaml文件创建rc/svc

 1 # create server-rc
 2 ➜  k8s  kubectl create -f server-rc.yml
 3 replicationcontroller/server created
 4 ➜  k8s  kubectl get rc
 5 NAME     DESIRED   CURRENT   READY   AGE
 6 server   1         1         1       15s
 7 
 8 # create service
 9 ➜  k8s  kubectl create -f server-svc.yml
10 service/server created
11 ➜  k8s  
12 ➜  ~  kubectl get svc
13 NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
14 kubernetes   ClusterIP   10.96.0.1       <none>        443/TCP    24h
15 server       ClusterIP   10.103.92.121   <none>        3000/TCP   38s
16 ➜  ~  
17 
18 # create worker-rc
19 ➜  k8s  kubectl create -f worker-rc.yml 
20 replicationcontroller/worker created
21 ➜  k8s  kubectl get rc
22 NAME     DESIRED   CURRENT   READY   AGE
23 server   1         1         1       14m
24 worker   2         2         2       10s
25 ➜  k8s  kubectl get pods
26 NAME           READY   STATUS    RESTARTS   AGE
27 server-x67sw   1/1     Running   0          14m
28 worker-45qjt   1/1     Running   0          15s
29 worker-gvwlt   1/1     Running   0          15s
30 ➜  k8s

 

通过exec进入server/worker容器查看日志, 可以看到连接已经成功:

 1 ➜  k8s docker ps | grep python | awk '{print $1, $3 $4}'
 2 7b96a767637c "pythonworker.py"
 3 fb45f45be871 "pythonworker.py"
 4 e217df0ca52d "pythonserver.py"
 5 ➜  k8s docker exec -it e217df0ca52d /bin/bash
 6 root@server-x67sw:/env/server# ps -ef
 7 UID        PID  PPID  C STIME TTY          TIME CMD
 8 root         1     0  0 15:39 ?        00:00:00 python server.py
 9 root         7     0  0 15:40 pts/0    00:00:00 /bin/bash
10 root        12     7  0 15:40 pts/0    00:00:00 ps -ef
11 root@server-x67sw:/env/server# ls
12 Dockerfile  log  server.py
13 root@server-x67sw:/env/server# tail -f log/server.log 
14 2018-12-06 15:39:56 [INFO]  Waiting for connection...
15 2018-12-06 15:54:06 [INFO]  ('10.32.0.9', 51266) connected
16 2018-12-06 15:54:06 [INFO]  ('10.32.0.10', 47969) connected
17 ^C
18 root@server-x67sw:/env/server# exit
19 exit
20 ➜  k8s docker exec -it 7b96a767637c /bin/bash
21 root@worker-gvwlt:/env/worker# ps -ef
22 UID        PID  PPID  C STIME TTY          TIME CMD
23 root         1     0  0 15:54 ?        00:00:00 python worker.py
24 root         6     0  0 15:57 pts/0    00:00:00 /bin/bash
25 root        11     6  0 15:57 pts/0    00:00:00 ps -ef
26 root@worker-gvwlt:/env/worker# tail -f log/worker.log 
27 2018-12-06 15:56:31 [INFO]  [recv] hello, docker!
28 ^C
29 root@worker-gvwlt:/env/worker# exit
30 exit
31 ➜  k8s

 

在宿主机直接使用VIP访问server成功(使用original/worker进行测试, ip地址通过配置文件读入)：

1 ➜  worker  cat ini/config.ini | grep ip
2 ip = 10.103.92.121 
3 ➜  worker  python worker.py 
4 [+][recv] hello, docker!
5 [+][recv] hello, docker!
6 ^C
7 [-] signal(2) received, exit!
8 ➜  worker

 

posted @ 2018-12-07 07:40  子厚。  阅读(375)  评论(0)  编辑  收藏  举报