OpenShift_042：RoadShow 回顾之二：部署 mlbparks

环境：OCP 3.4

缩写 MLB 代表 Major League Baseball，美国职棒大联盟。

1. 下载 mlbparks 源代码（在 MAC 机器上做）
cd ~/mygit
git clone -b 1.0.0 https://github.com/openshift-roadshow/mlbparks.git
scp -r mlbparks/ root@registry.example.com:/opt/

2. 初始化 mlbparks git 仓库（在 Registry 机器上操作）
mkdir -p /opt/git/repo/mlbparks.git;
cd /opt/git/repo/mlbparks.git;
git init --bare;
git update-server-info;
mv hooks/post-update.sample hooks/post-update;

3. 拷贝 mlbparks 代码，并提交（在 Registry 机器上操作）
cd /opt;
mv mlbparks mlbparks-demo

git clone file:///opt/git/repo/mlbparks.git/;

cp mlbparks-demo/* mlbparks -rf;
cp mlbparks-demo/.sti mlbparks -rf;
cp mlbparks-demo/.htaccess mlbparks -rf;
cp mlbparks-demo/.gitignore mlbparks -rf;
cd mlbparks;
git add .;
git commit -m 'initial upload';
git push origin master;

4. 克隆 mlbparks git 仓库，并部署 mlbparks 应用（在 Master 上操作）
cd /tmp;
git clone http://git.example.com/git/mlbparks.git;

修改 /tmp/mlbparks/ose3/application-template-eap.json
把 parameters 中的 GIT_URI 值改为 http://git.example.com/git/mlbparks.git
把 parameters 中的 MAVEN_MIRROR_URL 值改为 http://192.168.56.1:8081/nexus/content/groups/public/

创建 template
cd /tmp/mlbparks/ose3
oc create -f application-template-eap.json

创建  jboss-eap70-openshift Image Stream
由于 template 中使用了 jboss-eap70-openshift Image Stream，因此需要创建该 IS，否则会报如下错误：
An error occurred while starting the build.Error resolving ImageStreamTag jboss-eap70-openshift:1.4 in namespace openshift: imagestreams "jboss-eap70-openshift" not found
关于如何创建 jboss-eap70-openshift IS，请参考《部署 MyBank 到 JBoss EAP 7》。

创建应用
oc new-app mlbparks --name=mlbparks
输出如下：
--> Deploying template "applications/mlbparks" to project applications

     mlbparks
     ---------
     Application template MLBParks backend running on JBoss EAP and using MongoDB

     * With parameters:
        * Application Name=mlbparks
        * Application route=
        * Mongodb App=mongodb-mlbparks
        * Git source repository=http://git.example.com/git/mlbparks.git
        * Git branch/tag reference=master
        * Maven mirror url=http://192.168.56.1:8081/nexus/content/groups/public/
        * Database name=mongodb
        * MONGODB_NOPREALLOC=
        * MONGODB_SMALLFILES=
        * MONGODB_QUIET=
        * Database user name=userdEl # generated
        * Database user password=aa7rm6gw # generated
        * Database admin password=h7adaF7C # generated
        * GitHub Trigger=5oAIAQI4 # generated
        * Generic Trigger=IcsEXf8s # generated

--> Creating resources ...
    configmap "mlbparks" created
    service "mongodb-mlbparks" created
    deploymentconfig "mongodb-mlbparks" created
    imagestream "mlbparks" created
    buildconfig "mlbparks" created
    deploymentconfig "mlbparks" created
    service "mlbparks" created
    route "mlbparks" created
--> Success
    Build scheduled, use 'oc logs -f bc/mlbparks' to track its progress.
    Run 'oc status' to view your app.

OpenShift 做了如下事情：

• 配置并启动了一个 build
• 克隆 git 仓库
• 配置并部署 MongoDB
• 自动生成 user, password, database name
• 配置环境变量，使得应用连接到 MongoDB
• 创建 services
• 为应用的 route 增加 label：type=parksmap-backend

如果不想修改 template，则需要在创建应用时指定参数 GIT_URI
oc new-app mlbparks --name=mlbparks -p GIT_URI=http://git.example.com/git/mlbparks.git

但这样设置后，build 的时候依然会失败，因为默认会去访问外网 Maven 仓库，由于无法访问，所以报错。
可以在控制台的 BuildConfig 中增加该参数MAVEN_MIRROR_URL=http://192.168.56.1:8081/nexus/content/groups/public/

也可以用命令行重新 build

oc new-app mlbparks --name=mlbparks -p GIT_URI=http://git.example.com/git/mlbparks.git -p MAVEN_MIRROR_URL=http://192.168.56.1:8081/nexus/content/groups/public/

注意 build 时间比较长，10分钟左右，这次成功了！

5. 清理（在 Master 上操作）

如果有错，执行以下命令清理，然后重做：

oc delete configmaps/mlbparks is/mlbparks bc/mlbparks dc/mlbparks svc/mlbparks routes/mlbparks dc/mongodb-mlbparks svc/mongodb-mlbparks 

参考文献：
1. http://labs.openshift3roadshow.com/roadshow/
2. https://github.com/openshift-roadshow/mlbparks