通过Auto Scaling管理Amazon EC2中应用程序的代码更改的最佳方法 [英] Best way to manage code changes for application in Amazon EC2 with Auto Scaling

问题描述

我在AWS的Auto Scaling中有多个实例在负载均衡器后面运行。

I have multiple instances running behind Load balancer with Auto Scaling in AWS.

现在，如果我必须对这些实例和任何新实例进行一些代码更改，可能由于自动缩放策略而启动，执行此操作的最佳方法是什么？

Now, if I have to push some code changes to these instances and any new instances that might launch because of auto scaling policy, what's the best way to do this?

我知道的唯一方法是，使用最新代码创建新的AMI，然后进行修改自动缩放策略以使用此新AMI，然后终止现有实例。但这可能会导致更长的停机时间，而且我不确定整个过程是否可以自动化。

The only way I am aware of is, to create a new AMI with latest code, modify the auto scaling policy to use this new AMI and then terminate the existing instances. But this might involve a longer downtime and I am not sure whether the whole process can be automated.

任何朝着这个方向发展的指针都会受到赞赏。

Any pointers in this direction will be highly appreciated.

推荐答案

我进行代码更改的方法是拥有一个主服务器，在该服务器上进行代码编辑。然后通过cron作业通过ssh进行伸缩的所有从属服务器，以使所有文件保持最新状态。所有服务器每30分钟同步一次-随机间隔几秒钟，以防止在同一秒内访问它。 （请注意，我将主服务器保留在负载均衡器之外，因此用户始终会收到相同的代码。类似地，当我决定发布我的代码更改时，我会从测试服务器到主服务器执行rsync。

The way I do my code changes is to have a master server which I edit on the code on. All the slave servers which scale then rsync via ssh by a cron job to bring all the files up to date. All the servers sync every 30 minutes +- a few random seconds to keep from accessing it at the exact same second. (note I leave the Master off of the load balancer so users always have the same code being sent to them. Similarly, when I decide to publish my code changes, I do an rsync from my test server to my master server.

使用这种方法，您只需要在启动中放入sync命令，就不必担心从属映像上的代码状态如何了。在启动后保持最新状态。

Using this approach, you merely have to put the sync command in the start-up and you don't have to worry about what the code state was on the slave image as it will be up to date after it boots.

编辑：
我们现在已停止使用此方法，并开始使用针对此特定需求的新服务AWS CodeDeploy目的：

We have stopped using this method now and started using the new service AWS CodeDeploy which is made for this exact purpose:

http://aws.amazon.com / codedeploy /

希望这会有所帮助。

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