OpenShift 利用Pipline 实现CI/CD Tips

RedHat OpenShift有Pipline工具可以灵活的实现程序的编译以及发布。下面是通过发布vue的简单demo，给大家演示下过程.

1.在OpenShift控制台–>Operators–>按照Red Hat OpenShift Piplines

2.安装好以后，切换到开发者视图，可以看到有管道的目录，点击管道开始创建OpenShift Pipline。

3.如果我们熟悉OC命令和Yaml文件的话，可以在终端上用命令直接操作Pipline，我这里都是用控制台做出的。

主要就是两步，第一步把Github代码下载到共享硬盘空间（工作区），第二步通过工程的DockerFile文件，Build出镜像，并且把镜像推送到OpenShift的镜像库里面。所谓工作区，就是一块共享的硬盘空间，各个Task都可以读取这块硬盘空间的文件，实现Task间的文件共享。

下面是Yaml文件，这个文件可以事先手动做成。如果是用图形界面做成Pipeline的话，会自动生成这个文件。

apiVersion: tekton.dev/v1beta1
kind: Pipeline
metadata:
  name: demo-pipeline
spec:
  workspaces:
    - name: shared-workspace
    - name: ssh-directory
  params:
    - name: IMAGE
      description: The image name.
      default: image-registry.openshift-image-registry.svc:5000/demo-dev/admin
  tasks:
    - name: fetch-repository
      taskRef:
        name: git-clone
        kind: ClusterTask
      workspaces:
        - name: output
          workspace: shared-workspace
        - name: ssh-directory
          workspace: ssh-directory
      params:
        - name: url
          value: git@github.ibm.demo/demo.git
        - name: subdirectory
          value: ""
        - name: deleteExisting
          value: "true"
    - name: create-image
      taskRef:
        name: buildah
        kind: ClusterTask
      runAfter:
        - fetch-repository
      params:
        - name: IMAGE
          value: $(params.IMAGE)
      workspaces:
        - name: source
          workspace: shared-workspace

下面是Vue工程的DockerFile文件，步骤就是先Pull Node，把vue工程build成JS 和 css静态资源文件，接着再拉取ngnix镜像，把这些资源文件Copy到ngnix中，并且修改ngnix的端口号为8081。

# build stage
FROM node:14.17.6-alpine as build-stage

ARG MODE=staging

WORKDIR /app
COPY package*.json ./
RUN npm install
COPY . .

# see also https://stackoverflow.com/q/50772662/2497876
RUN npm run build -- --mode ${MODE}

# production stage
FROM nginx:1.17.9-alpine as production-stage

# support running as arbitrary user which belogs to the root group
RUN chmod g+rwx /var/cache/nginx /var/run /var/log/nginx
RUN chgrp -R root /var/cache/nginx

# users are not allowed to listen on priviliged ports
RUN sed -i.bak 's/listen\(.*\)80;/listen 8081;/' /etc/nginx/conf.d/default.conf
EXPOSE 8081

# comment user directive as master process is run as user in OpenShift anyhow
RUN sed -i.bak 's/^user/#user/' /etc/nginx/nginx.conf

RUN addgroup nginx root
USER nginx

COPY --from=build-stage /app/dist /usr/share/nginx/html
# COPY prod_nginx.conf /etc/nginx/nginx.conf

CMD ["nginx", "-g", "daemon off;"]