Openshift是一个开源容器云平台，是一个基于主流的容器技术Docker和K8s构建的云平台。Openshift底层以Docker作为容器引擎驱动，以K8s作为容器编排引擎组件，并提供了开发语言，中间件，DevOps自动化流程工具和web console用户界面等元素，提供了一套完整的基于容器的应用云平台
OpenShift 生态系统成了 Kubernetes 生态系统。其核心技术使生态系统可以非常地灵活，社区已经在 API 和接口上做了标准化，这为统一集成的新思想成为了可能。它还使我们可以在任何云平台上部署 OpenShift，比如 AWS、 Azure、 GCP、 OpenStack、 VMware、 RHV，以及 bare meta。
Openshift部署流程
示例过程如下
$ oc new-project project1 Now using project "project1" on server https://127.0.0.1:8443. $ oc new-app centos/ruby-22-centos7~https://github.com/openshift/ruby-ex.git --> Found Docker image 1f02469 (8 days old) from Docker Hub for "centos/ruby-22-centos7" ... ... * An image stream will be created as "ruby-22-centos7:latest" that will track the source image * A source build using source code from https://github.com/openshift/ruby-ex.git will be created * The resulting image will be pushed to image stream "ruby-ex:latest" * Every time "ruby-22-centos7:latest" changes a new build will be triggered * This image will be deployed in deployment config "ruby-ex" * Port 8080/tcp will be load balanced by service "ruby-ex" * Other containers can access this service through the hostname "ruby-ex" ... ... Run 'oc status' to view your app. 上面的过程发生了什么：
OpenShift pulls Docker image centos/ruby-22-centos7 OpenShift 从 GitHub 下载了源代码
OpenShift applies GitHub 源代码转换为image, 命名为ruby-ex存储于内部仓库中
ruby-ex 用来创建build and deployment configurations
The ruby-ex service 为了pod负载均衡，使用 ruby-ex 这个名称
再看下应用构建过程
部署过程
POD管理
$ oc get pods NAME READY STATUS RESTARTS AGE ruby-ex-1-build 0/1 Completed 0 1h ruby-ex-1-zzhrc 1/1 Running 0 56m 也可以使用-o wide的输出，我们可以看到pod所在结点与IP $ oc get pod -o wide NAME READY STATUS RESTARTS AGE IP NODE docker-registry-11-vcqzz 1/1 Running 0 36d 10.128.0.244 openshift-node-01.hsh.io hawkular-apm-1-8c2s8 1/1 Running 0 19h 10.131.8.186 openshift-node-17.hsh.io hawkular-apm-es-1-ddrqt 1/1 Running 0 38d 10.130.1.53 openshift-master-03.hsh.io registry-console-3-wptmh 1/1 Running 1 63d 10.128.8.11 openshift-node-14.hsh.io router-32-bpzcx 1/1 Running 0 7d 10.108.78.134 openshift-master-02.hsh.io router-32-cp9sj 1/1 Running 0 7d 10.108.78.136 openshift-node-01.hsh.io router-32-dbd0g 1/1 Running 0 7d 10.108.78.138 openshift-node-03.hsh.io router-32-f4b46 1/1 Running 0 7d 10.108.78.140 openshift-node-05.hsh.io router-32-k8mpx 1/1 Running 0 7d 10.108.78.139 openshift-node-04.hsh.io router-32-lhbrl 1/1 Running 0 7d 10.108.78.145 openshift-lb-02.hsh.io router-32-psnbh 1/1 Running 0 7d 10.108.78.133 openshift-master-01.hsh.io router-32-zqc7k 1/1 Running 0 7d 10.108.78.135 openshift-master-03.hsh.io router-32-zv1kx 1/1 Running 0 7d 10.108.78.137 openshift-node-02.hsh.io Openshift部署容器过程
容器和 Kubernetes 提供了许多有价值的概念，适用于任何应用。容器可以提供一种统一的应用打包方式，让其在开发、测试、质保、准生产和生产环境中运行。它们带来了不变性，可简化运维团队处理安全更新的方式。它们还能让你在云环境间进行移植。Kubernetes 和 OpenShift 之类的平台可以跨任意云环境提供统一的、自动化的、可伸缩的环境（比如，多个云环境）。
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