Expose Port Inside Running Container on Docker Toolbox for Mac

Problem

Docker only allows to define port that need to be exposed when doing container creation. When the container already running and new port need to be exposed, you're out of luck.

Goal

You want to expose new port which run by application inside a running container, so you can hit the docker-vm-ip:port to access the port on Mac OS X.

Assumptions

• IP of Boot2Docker VM (Which run by Virtualbox) is 192.168.99.100
• IP of the docker container running the application is 172.17.0.2
• The application listen on address 0.0.0.0 and port 80

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Simplify Multi-Hop SSH Connection Using Config

Goal

Using SSH config to simplify connecting to another host from a host a.k.a multi-hop connection. Diagram for the connection:

+---------------+
| Local Machine |
| 192.168.0.5   |
+---------------+
      |
      | SSH 
       \
       \/
+-------------------------------------+
| Host Machine 192.168.0.10           |
|           /          \              |
|          / -- SSH --  \             |
|  +--------------+  +-------------+  |
|  | Docker 1     |  | Docker 2    |  |
|  | 172.17.0.1   |  | 172.17.0.2  |  |
|  +--------------+  +-------------+  |
|                                     |
+-------------------------------------+

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