【openshift 学习笔记】第十四章系统集成与定制

谁借莪１个温暖的怀抱￠ 2022-05-27 06:49 293阅读 0赞

# 一. s2i 镜像定制 #

#  下载S2I的二进制执行文件 #

wget https://github.com/openshift/source-to-image/releases/download/v1.1.9/source-to-image-v1.1.9-db2b4645-linux-amd64.tar.gz

#  解压至 /usr/bin 目录下 #

tar -xvzf source-to-image-v1.1.9-db2b4645-linux-amd64.tar.gz -C /usr/bin

#  通过 s2i 创建一个 tomcat-s2i 的 S2I Builder 镜像 #

s2i create tomcat-s2i tomcat-s2i-catalog

![20180413145119269][]

***s2i目录下为S2I脚本。***

*  assemble: 源代码的编译、构建。
 *  run: 生成的最终镜像将以这个脚本作为容器的启动命令。
 *  usage: 打印帮助，一般作为S2I Builder镜像的启动命令。
 *  save-artifacts: 为了实现增量构建，在构建过程中会执行此脚本保存中间构建产物。此脚本并不是必需的。

#     #

# 二. 编写 Dockerfile #

FROM maven:3.3-jdk-7
    ENV BUILDER_VERSION 1.0
    LABEL io.openshift.s2i.scripts-url=image:///usr/libexec/s2i \
          io.k8s.description="Tomcat S2I Builder" \
          io.k8s.display-name="tomcat s2i builder 1.0" \
          io.openshift.expose-services="8080:http" \
          io.openshift.tags="builder,tomcat"
    WORKDIR /opt
    ADD ./apache-tomcat-8.5.5.tar.gz /opt
    RUN useradd -m tomcat -u 1001 && \
    chmod -R a+rw /opt && \
    chmod a+rwx /opt/apache-tomcat-8.5.5/* && \
    chmod +x /opt/apache-tomcat-8.5.5/bin/*.sh && \
    rm -rf /opt/apache-tomcat-8.5.5/webapps/*
    COPY ./s2i/bin/ /usr/libexec/s2i
    USER 1001
    EXPOSE 8080
    ENTRYPOINT []
    CMD ["/usr/libexec/s2i/usage"]

#  io.openshift.s2i.scripts-url=image:///usr/libexec/s2i标签指定了S2I脚本路径。S2I执行器将到此路径中查找所需要的执行脚本 #

# 三. 编辑 S2I 脚本 #

#  编辑s2i/bin/assemble脚本 #

#!/bin/bash -e
    #
    # S2I assemble script for the 'tomcat-s2i' image.
    # The 'assemble' script builds your application source so that it is ready to run.
    #
    # For more information refer to the documentation:
    #	https://github.com/openshift/source-to-image/blob/master/docs/builder_image.md
    #
    
    
    # If the 'tomcat-s2i' assemble script is executed with the '-h' flag, print the usage.
    if [[ "$1" == "-h" ]]; then
    	exec /usr/libexec/s2i/usage
    fi
    
    
    # Restore artifacts from the previous build (if they exist).
    #
    if [ "$(ls /tmp/artifacts/ 2>/dev/null)" ]; then
      echo "---> Restoring build artifacts..."
      mv /tmp/artifacts/. ./
    fi
    
    
    echo "---> Installing application source..."
    cp -Rf /tmp/src/. ./
    
    
    echo "---> Building application from source..."
    # TODO: Add build steps for your application, eg npm install, bundle install, pip install, etc.
    mvn -Dmaven.test.skip=true package
    find . -type f -name '*.war'|xargs -i cp {} /opt/apache-tomcat-8.5.5/webapps/
    mvn clean

触发一次Maven构建，并将构建产生的WAR包拷贝到Tomcat服务器的webapps目录下进行部署

#  编辑s2i/bin/run脚本 #

#!/bin/bash -e
    #
    # S2I run script for the 'tomcat-s2i' image.
    # The run script executes the server that runs your application.
    #
    # For more information see the documentation:
    #	https://github.com/openshift/source-to-image/blob/master/docs/builder_image.md
    #
    
    
    bash -c "/opt/apache-tomcat-8.5.5/bin/catalina.sh run"

#  #

#     #

# 四. 构建 #

#  执行make以及将tomcat-s2i镜像推送到自己的镜像仓库，将镜像倒入到 openshift 项目 #

oc import-image xxxxxxx/sandbox/tomcat-s2i -n openshift --confirm --insecure

查看导入的Image Stream: oc get is -n openshift

![20180413150926900][]

为了 OpenShift 识别镜像是 S2I Builder 镜像，需要编辑Image Stream，添加注解“tags”, oc edit is tomcat-s2i -n openshift

- annotations:  
           description: tomcat builder  
           openshift.io/display-name: tomcat builder  
           tags: builder,tomcat

# 四. 验证 #

![20180413151401700][]

[20180413145119269]: /images/20220527/869835480c79427993dbe9bcce7b0e89.png
[20180413150926900]: /images/20220527/8bde6684f519499aaa683c56df5ca92d.png
[20180413151401700]: /images/20220527/d3160e954def402a8bf4021e1f76d349.png