Vanessa

下文转自：比较不同的 PaaS 平台上的 Node.js 支持  

 

Node.js的相对 其他的语言来说可能仍然是年轻的，但是它的虚拟主机却有很多的选择。在这篇文章中，我们就来看看几个“平台即服务（PaaS）”提供商。

我这里不涵盖某些“基础设施即服务（IaaS）”的选择，比如  AWS  和  Joyent，尽管这些选择之中的某些PaaS和IaaS之间的界限有一点点模糊。

在这一轮中，我主要考察两个方面：部署和环境变量的配置。我还把一些有关起步，仪表板的截图和对其它的杂项操作的观察囊括了进来。在以后的文章中，我们将会运行一些基础的性能测试，然后来看看架构伸缩难易程度。

Misc Notes and Dashboard

I didn’t try Heroku for my own projects until about 3 months ago, partly because I have a modest level of comfort in setting up my own servers, and partly because I just figured they treated node.js as an afterthought. But if you can get over their lack of WebSocket support and some misleading marketing and stats, it’s a pretty smooth experience.

They’ve also got a very polished and functional dashboard, with some handy features you won’t find elsewhere like pointing to an S3-hosted file for 404 pages, and the ability to transfer ownership of a project to a different user.

Windows Azure

http://windowsazure.com

Yep. Believe it.

Configuring variables

Variables can be set either via the web interface or the CLI. I experienced one weird bit behavior on the SECRET when I first set it up via the CLI; it was lowercased to secret. I had to use the web interface to correct it.

The app ran fine without making any changes to our configuration for ports, although the logs showed a pretty wacky value: \\.\pipe\bea0dffc-de5b-47f4-8575-4d17c2175fd5

Deploying

You might expect Microsoft to have all kinds of custom stuff here. While there are a few files that get dropped into you repo (name azure_error and iisnode.yml), the (optional) CLI is installed via npm and deployment is handled via git. Nice!

As of writing, Azure is running 0.8.2, and this value must be configured correctly in package.json.

Misc Notes and Dashboard

The account creation process was by far the most tedious of any listed here. It included SMS verification, a Windows Live account, and a separate git user account for deploying. But overall, the dashboard is pretty nice considering the huge scope of the Azure platform. They also support streaming log files. As far as I can tell, Heroku is the only other provider on this list to do so.

Engine Yard

http://engineyard.com

Like Heroku, Engine Yard is known primary for it’s Ruby on Rails hosting. Unlike Heroku, you have more control over the setup and environment. It’s still a PaaS, but people with some direct server experience will appreciate being a little “closer to the metal.”

Configuring variables

Environment variable cas be set by using the ey_config npm module. Engine Yard also support SSH access to your machine, which means you could create a config.json and drop it in the right place.

The port should be process.env.PORT and nconf is already handling that for us.

Deploying

Handled via git.

It respects the node version value in package.json but only up to 0.8.11.

Misc Notes and Dashboard

When you create an application, you get to choose between nginx as front-end proxy (which the recommend) or going straight to Node.js, the latter of which gives you option of WebSockets.

When my first deploy failed, a chat window popped up with option for me to put in my phone number.

It ignores the node version value in package.json and runs a rusty ol’ v0.6.20 by default, but with some extra steps you can change that.

Misc Notes and Dashboard

I had some problems getting the sample app running at first, so I started over and let OpenShift populate the git repository for me with their sample files. There are a few extra things in there, many of which are tucked under the.openshift directory. These include deploy hooks and config files. The README they include does a good job of laying out the structure and explaining the purpose of each file.

But I still got stuck on the fact that I needed to listen on a specific IP address. That mean including this:

var ipaddr = process.env.OPENSHIFT_NODEJS_IP || "127.0.0.1";

And then added ipaddr in the app.listen section of my server.js like this:

app.listen(app.get('port'), ipaddr, function(){...

I’ve had an exchange with the OpenShift folks and they’re going to update their getting started guide to make this more clear.