测试与docker守护程序的连接 [英] Testing connection to docker daemon

问题描述

但是，有时候，执行 eval$（docker-machine env默认）不会导致docker守护程序立即连接，当下一行到达时（ docker-compise up ）我得到code>无法连接到Docker守护程序。 Docker守护程序是否在此主机上运行？

如果我使用 sleep 有几个问题解决了几秒。

有没有办法通过一些系统工具测试连接到守护进程（检查进程是否存在，如果已经建立了网络连接，端口听，等）？我想从外部测试docker守护程序，不使用 docker cli

解决方案

Docker Remote API 具有 PING终结点。您可以使用端点来检查是否可以成功连接到Docker守护程序。 docker-machine env 设置环境变量 DOCKER_HOST ，所以你可以使用 DOCKER_HOST 作为主机ping。使用 nc ，您可以按以下方式ping主机：

  $ eval $（docker-machine env default）
 $ echo -eGET / _ping HTTP / 1.1\r\\\
| nc $ DOCKER_HOST 
 HTTP / 1.1 200 OK 
服务器：Docker / 1.10.2（linux）
日期：星期三，03三月2016 07:05:58 GMT 
内容长度：2 
 Content-Type：text / plain; charset = utf-8 
 
 OK 
  

您将需要检查退货值。如果返回确定，则连接成功。一个简单的检查可能如下所示（这可能需要更多的细化）：

 ＃！/ bin / bash 
如果[$（echo -eGET / _ping HTTP / 1.1\r\\\
| nc $ DOCKER_HOST | tail -n 1）=='OK'];然后
 echo你连接
 fi 
  

I am writing a script that will boot docker-compose automatically.

However, sometimes, doing eval "$(docker-machine env default)" doesn't cause the docker daemon to be connected immediatly and when the next line comes (docker-compose up) I get Cannot connect to the Docker daemon. Is the docker daemon running on this host?

If I use sleep for a few seconds the issue resolves.

Is there a way to test the connect to daemon via some system tool (checking if a process exists, if a network connect was made, port listened to, etc)? I want to test the docker daemon externally and not use docker cli

解决方案

The Docker Remote API has a PING endpoint. You can use the endpoint to check whether you can successfully connect to the Docker daemon. docker-machine env sets the environment variable DOCKER_HOST, so you can use DOCKER_HOST as host to ping. Using nc, you can ping the host as follows:

$ eval "$(docker-machine env default)"
$ echo -e "GET /_ping HTTP/1.1\r\n" | nc $DOCKER_HOST
HTTP/1.1 200 OK
Server: Docker/1.10.2 (linux)
Date: Thu, 03 Mar 2016 07:05:58 GMT
Content-Length: 2
Content-Type: text/plain; charset=utf-8

OK

You will need to check the return value. If it returns 'OK', the connection was successful. A simple check could look as follows (this probably needs more refinement):

#!/bin/bash
if [ "$(echo -e "GET /_ping HTTP/1.1\r\n" | nc $DOCKER_HOST | tail -n 1)" == 'OK' ] ; then
  echo "You are connected"
fi

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