为什么是deploymentconfig而不是Kubernetes的deployment
在new-app的时候openshift直接创建了一个deploymentconfig并部署成rc,开始并不理解为什么要这么做，后来看到下面这个命令才大概明白，原因主要有两点：
- deploymentconfig在创建的时候通过new-app自动生成，避免直接从无到有去写一个deployment的yaml文件，减少了出错。
- deployment并不具备回滚的功能，如果部署到一个版本就无法回滚到上一个版本或者更前一个版本了，而dc有个revision,同时保留了之前部署版本的配置。如下：
如果回滚可以通过下面命令
oc rollback openshift-tomcat --to-version=2
- 创建new-app的时候除了创建dc,还会创建一个服务，名字和app名字一样
如果需要在容器运行前就带入环境变量
oc new-app openshift-tomcat --name=openshift-tomcat --env DEPLOY_MODE=stg
带入多个
C:minishift-1.26.1-windows-amd64>oc new-app openshift-tomcat --name=openshift-tomcat --env DEPLOY_MODE=stg SITE=sz warning: Cannot find git. Ensure that it is installed and in your path. Git is required to work with git repositories. --> Found image a4dc2a4 (6 hours old) in image stream "myproject/openshift-tomcat" under tag "latest" for "openshift-tomcat" temp.builder.openshift.io/myproject/openshift-tomcat-3:d91ff45d --------------------------------------------------------------- Platform for building and running JEE applications on Tomcat Tags: builder, tomcat * This image will be deployed in deployment config "openshift-tomcat" * Port 8080/tcp will be load balanced by service "openshift-tomcat" * Other containers can access this service through the hostname "openshift-tomcat" --> Creating resources ... deploymentconfig.apps.openshift.io "openshift-tomcat" created service "openshift-tomcat" created --> Success Application is not exposed. You can expose services to the outside world by executing one or more of the commands below: 'oc expose svc/openshift-tomcat' Run 'oc status' to view your app.
容器运行中设置环境变量
C:minishift-1.26.1-windows-amd64>oc set env dc/openshift-tomcat DEPLOY_MODE="prd" deploymentconfig.apps.openshift.io/openshift-tomcat updated
列出环境变量
C:minishift-1.26.1-windows-amd64>oc set env dc/openshift-tomcat --list # deploymentconfigs/openshift-tomcat, container openshift-tomcat DEPLOY_MODE=stg