如何在OSX上使用docker容器进行ssh连接(boot2docker)

Question

我在OSX上使用docker和boot2docker.

我想从我的终端获得一个Ssh连接到一个正在运行的容器.

但我不能这样做:(

我认为这是因为Docker在虚拟机中运行.

Answer 1

要为运行在VM中的容器启用ssh,必须执行以下操作:

1. sshd在容器中安装并运行(示例).sshd默认情况下不存在,因为容器通常只运行一个进程,尽管它们可以运行任意多个进程.
2. EXPOSE作为创建映像的一部分的端口,通常为22,因此当您运行容器时,守护程序连接到EXPOSE容器内的'd端口,并且可以在容器的外部暴露某些东西.
3. 运行容器时,需要确定如何映射该端口.您可以让Docker自动执行或明确执行.我建议明确:docker run -p 42222:22 ...将VM上的端口42222映射到容器中的端口22.
4. 将端口映射添加到VM以将端口公开给主机.例如,当您的VM未运行时,您可以添加如下映射:VBoxManage modifyvm "boot2docker-vm" --natpf1 "containerssh,tcp,,42222,,42222"

然后,从主机,您应该能够ssh到主机上的端口42222到达容器的ssh守护程序.

以下是执行上述步骤时发生的情况:

$ VBoxManage modifyvm "boot2docker-vm" --natpf1 "containerssh,tcp,,42222,,42222"
$ ./boot2docker start
[2014-04-11 12:07:35] Starting boot2docker-vm...
[2014-04-11 12:07:55] Started.
$ docker run -d -p 42222:22 dhrp/sshd
Unable to find image 'dhrp/sshd' (tag: latest) locally
Pulling repository dhrp/sshd
2bbfe079a942: Download complete 
c8a2228805bc: Download complete 
8dbd9e392a96: Download complete 
11d214c1b26a: Download complete 
27cf78414709: Download complete 
b750fe79269d: Download complete 
cf7e766468fc: Download complete 
082189640622: Download complete 
fa822d12ee30: Download complete 
1522e919ec9f: Download complete 
fa594d99163a: Download complete 
1bd442970c79: Download complete 
0fda9de88c63: Download complete 
86e22a5fdce6: Download complete 
79d05cb13124: Download complete 
ac72e4b531bc: Download complete 
26e4b94e5a13b4bb924ef57548bb17ba03444ca003128092b5fbe344110f2e4c
$ docker ps
CONTAINER ID        IMAGE               COMMAND                CREATED             STATUS              PORTS                   NAMES
26e4b94e5a13        dhrp/sshd:latest    /usr/sbin/sshd -D      6 seconds ago       Up 3 seconds        0.0.0.0:42222->22/tcp   loving_einstein     
$ ssh root@localhost -p 42222
The authenticity of host '[localhost]:42222 ([127.0.0.1]:42222)' can't be established.
RSA key fingerprint is ....
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '[localhost]:42222' (RSA) to the list of known hosts.
root@localhost's password: screencast
Welcome to Ubuntu 12.04 LTS (GNU/Linux 3.12.1-tinycore64 x86_64)

 * Documentation:  https://help.ubuntu.com/

The programs included with the Ubuntu system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
applicable law.

root@26e4b94e5a13:~# exit
logout

这样就显示了ssh-> localhost 42222-> VM端口42222->容器端口22.

Answer 2

Docker已将docker exec命令添加到Docker 1.3.0.您可以使用以下方法连接到正在运行的容器:

docker exec -it <container id> /bin/bash

这将连接到正在运行的容器上的bash提示符.