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几年前我为别人写了个Android媒体播放器程序。他想知道用户的使用情况，以便推广告。为此，我需要建一个webserver和database用来tracking。Node.JS + MongoDB是一个理想的选择。因为不想花钱，于是选用了OpenShift Online free account (provided by RedHat)，虽然有quota限制，但足够满足这个小job。不幸的是2017年9月RedHat停止了免费用户支持（随后付费用户支持也停了）。后来RedHat又开始提供新的OpenShift Container Platform，参见wikipedia的解释：
OpenShift is a family of containerization software developed by Red Hat. Its flagship product is the OpenShift Container Platform—an on-premises platform as a service built around Docker containers orchestrated and managed by Kubernetes on a foundation of Red Hat Enterprise Linux. The family's other products provide said platform through different environments: OKD serves as the community-driven upstream (akin to CentOS), OpenShift Online is the platform offered as software as a service, Openshift Dedicated is the platform offered as a managed service, and OpenShift.io is an application development environmentfor the platform available online.
关于OKD：OKD is the Origin community distribution of Kubernetes optimized for continuous application development and multi-tenant deployment. OKD adds developer and operations-centric tools on top of Kubernetes to enable rapid application development, easy deployment and scaling, and long-term lifecycle maintenance for small and large teams. OKD is also referred to as Origin in github and in the documentation.
也就是说OpenShift = RedHat云 + Kubernetes + Docker
OpenShift提供了很不错的起步教程和配置界面，很容易创建project，开始deployment，设置一个router路由，从而提供可从外面访问的web server，可是，不知是因为地域原因，还是因为免费的服务原因，我在OpenShift新创建的webserver很不稳定，用web browser试十次可能有一次能正常打开网页(错误信息：application is not avaliable)。另外RedHat提供的CLI utility, OC，也不能在Ubuntu 16.04上运行，会出 libssl.so.10: cannot open shared object file: No such file or directory错，按照askubuntu的这个post也不能解决问题。我build OpenSSL from source也不能解决问题。参照issues/21061，最后从GitHub https://github.com/openshift/origin/releases 下载的版本可以正常工作。另外MacOS的版本也没有问题。
OpenShift提供了一些project的模版，其中就有Node.js+MongoDB, 我用这个模版创建项目，fork了GitHub project sclorg/nodejs-ex, 从OpenShift web console 获取了project的web hook URL， 然后在设置在GitHub setting/webhook payload，并且修改 "Content type" 为 'application/json'，这样每当更新GitHub 上的source code，GitHub 会push change到OpenShift，并且直接trigger a build和新的deployment，很cool。
正当服务的可靠性问题还没有解决，RedHat最近又更新policy，免费用户账号每30天就会失效，种种原因，我决定放弃OpenShift，既然OpenShift基于的Kubernetes是开源的，又拥有众多支持，何不直接从Kubernetes开始呢？
OpenShift is a family of containerization software developed by Red Hat. Its flagship product is the OpenShift Container Platform—an on-premises platform as a service built around Docker containers orchestrated and managed by Kubernetes on a foundation of Red Hat Enterprise Linux. The family's other products provide said platform through different environments: OKD serves as the community-driven upstream (akin to CentOS), OpenShift Online is the platform offered as software as a service, Openshift Dedicated is the platform offered as a managed service, and OpenShift.io is an application development environmentfor the platform available online.
关于OKD：OKD is the Origin community distribution of Kubernetes optimized for continuous application development and multi-tenant deployment. OKD adds developer and operations-centric tools on top of Kubernetes to enable rapid application development, easy deployment and scaling, and long-term lifecycle maintenance for small and large teams. OKD is also referred to as Origin in github and in the documentation.
The OKD API is located on each server at `https://:8443/apis`. OKD adds its own API groups alongside the Kubernetes APIs. Refer to the API.
也就是说OpenShift = RedHat云 + Kubernetes + Docker
OpenShift提供了很不错的起步教程和配置界面，很容易创建project，开始deployment，设置一个router路由，从而提供可从外面访问的web server，可是，不知是因为地域原因，还是因为免费的服务原因，我在OpenShift新创建的webserver很不稳定，用web browser试十次可能有一次能正常打开网页(错误信息：application is not avaliable)。另外RedHat提供的CLI utility, OC，也不能在Ubuntu 16.04上运行，会出 libssl.so.10: cannot open shared object file: No such file or directory错，按照askubuntu的这个post也不能解决问题。我build OpenSSL from source也不能解决问题。参照issues/21061，最后从GitHub https://github.com/openshift/origin/releases 下载的版本可以正常工作。另外MacOS的版本也没有问题。
OpenShift提供了一些project的模版，其中就有Node.js+MongoDB, 我用这个模版创建项目，fork了GitHub project sclorg/nodejs-ex, 从OpenShift web console 获取了project的web hook URL， 然后在设置在GitHub setting/webhook payload，并且修改 "Content type" 为 'application/json'，这样每当更新GitHub 上的source code，GitHub 会push change到OpenShift，并且直接trigger a build和新的deployment，很cool。
正当服务的可靠性问题还没有解决，RedHat最近又更新policy，免费用户账号每30天就会失效，种种原因，我决定放弃OpenShift，既然OpenShift基于的Kubernetes是开源的，又拥有众多支持，何不直接从Kubernetes开始呢？
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