Docker 是 dotCloud 最近几个月刚宣布的开源引擎，旨在提供一种应用程序的自动化部署解决方案，简单的说就是，在 Linux 系统上迅速创建一个容器（类似虚拟机）并在容器上部署和运行应用程序，并通过配置文件可以轻松实现应用程序的自动化安装、部署和升级，非常方便。因为使用了容器，所以可以很方便的把生产环境和开发环境分开，互不影响，这是 docker 最普遍的一个玩法。更多的玩法还有大规模 web 应用、数据库部署、持续部署、集群、测试环境、面向服务的云计算、虚拟桌面 VDI 等等。
... ➦At Socketplane we started out as four guys with a collectively strong belief in open source and open communities. We aligned around a shared vision that we wanted to be a critical part of Docker’s once in a decade disruption. Now that we are part of the Docker team, we couldn’t be happier.
We never looked to hedge our bets, our success was and obviously still is tied to the success of Docker. While there are many reasons that we decided to join the team, first and foremost Docker is unlike any other projects we have worked on in the past; the focus on user experience and simplicity is unmatched. Our early work with Docker during the open network design sprints gave us clear indications that the Docker maintainers were interested in being good open source stewards for the networking community in a project with an already staggering community of users and contributors. We also saw a genuine desire from Docker leadership to do right by both, individual contributors and the ecosystem. That made it all the more easy to jump in head first.
... ➦腾讯内部对Docker有着广泛的使用，其基于Yarn的代号为Gaia的调度平台可以同时兼容Docker和非Docker类型的应用，并提供高并发任务调度和资源管理，它具有高度可伸缩性和可靠性，能够支持MR等离线业务。
... ➦本文在现有文档的基础上总结了以下几点内容
docker的介绍，包括由来、适用场景等
docker背后的一系列技术 - namespace, cgroup, lxc, aufs等
docker在利用LXC的同时提供了哪些创新
方法一：用–amend选项
#修改需要修改的地方。
git add .
git commit –amend
注：这种方式可以比较方便的保持原有的Change-Id，推荐使用。
方法二：先reset，再修改
这是可以完全控制上一次提交内容的方法。但在与Gerrit配合使用时，需特别注意保持同一个commit的多次提交的Change-Id是不变的。为了保持提交到Gerrit的Change不变，需要复制对应的Change-Id到commit msg的最后，可以到Gerrit上对应的Change去复制.
... ➦Following on our previous discussion surveying the projects supporting applications within OpenStack, let’s continue our review with an in-depth look at the OpenStack-native Application Catalog: Murano, currently an incubation status project, having seen its functionality and core services integration advanced over the past few OpenStack releases.
An application catalog developed by Mirantis, HP and others (now including Cisco), that allows application developers and cloud administrators to publish applications in a categorized catalog to be perused and deployed by application consumers. The selection of applications available within the catalog is intended to be that of released versions (ready-state) of applications (cloud-native or enterprise-architected), not application versions that are mid-development. Ideally, these are applications ready to be consumed and run by application users.
... ➦Welcome to Hexo! This is your very first post. Check documentation for more info. If you get any problems when using Hexo, you can find the answer in troubleshooting or you can ask me on GitHub.
$ hexo new "My New Post"
More info: Writing
$ hexo server
More info: Server
$ hexo generate
More info: Generating
$ hexo deploy
More info: Deployment
首先需要为OpenStack添加一个公网网络，假设All-in-one环境建的公网网段为10.10.10.0/24，公网网关为10.10.10.1。这样为虚拟机绑定公网IP后，由于网关是不存在的，虚拟机无法访问外网。那虚拟机如果想访问外网怎么办呢？
... ➦To toggle a service from starting or stopping permanently you would need to:
echo manual | sudo tee /etc/init/SERVICE.override
where the stanza manual will stop Upstart from automatically loading the service on next boot. Any service with the .override ending will take precedence over the original service file. You will only be able to start the service manually afterwards. If you do not want this then simply delete the .override. For example:
... ➦The flask app is very simple, you have an index page where your can write and read comments.
So what we need ?
In my case a Digital Ocean droplet (I’m using Fedora 21).
So, first of all we connect to our vm with ssh.
$ ssh root@yourvmip
Now that we are inside we need to install git, Docker and docker-compose.
$ yum -y install git docker python-pip $ pip install docker-compose==1.1.0-rc2 $ systemctl start docker $ systemctl enable docker
That’s all we need to play with Docker.
... ➦