建立rails镜像

一.拉取轻量级基本镜像

docker pull index.tenxcloud.com/docker_library/alpine

二.配置Dockerfile

FROM index.tenxcloud.com/docker_library/rails
MAINTAINER author
#创建容器的工作路径
RUN mkdir -p /opt/rails
WORKDIR /opt/rails
RUN rails new blog
WORKDIR /opt/rails/blog
RUN bundle install

三. 生成镜像，推送到镜像仓库

    docker build -f Dockerfile -t test-registry:5000/rails:v1.1 . 
    docker push test-registry:5000/rails:v1.1

四. 利用rc和svc 文件启动容器

rails-rc.yaml

apiVersion: v1
kind: ReplicationController
metadata:
  name: rails
  labels:
  name: rails
  labels:
    name: rails
spec:
  replicas: 1
  selector:
    name: rails
  template:
    metadata:
      labels:
        name: rails
    spec:
      containers:
        - name: rails
          image: test-registry:5000/rails:v1.1
          imagePullPolicy: IfNotPresent
          command: ["/opt/rails/blog/bin/rails","server","-b","0.0.0.0"]

rails-svc.yaml

apiVersion: v1
kind: Service
metadata:
  name: rails
  labels:
    name: rails
spec:
  selector:
    name: rails
  type: NodePort
  ports:
    - port: 3000
      targetPort: 3000
      nodePort: 30000

kubectl create -f rails-rc.yaml,rails-svc.yaml