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ctables

Control iptables inside a container from the underlying host

Install

Just copy the ctables file to your underlying host and place in your executable path, e.g. /usr/local/bin/ctables. Make sure it is executable, chmod a+x /usr/local/bin/ctables.

Usage

ctables <command> <container>

Where:

  • command: one of up or down
  • container: container ID or name

You can run up multiple times, it is idempotent. If the container's network already is up, it will leave it as is. Similarly, you can run down multiple times. If the container's network already is down, it will leave it as is.

You only need one invocation of up to reverse 1, 2 or 1,000 down; you only need one invocation of down to reverse 1, 2 or 1,000 up.

How it works

When you invoke down, ctables does the following:

  1. Find the container by name or ID
  2. Enter the container and add an iptables rule to drop all inbound traffic
  3. Enter the container and add an iptables rule to drop all outbound traffic

When you invoke up, ctables does the following:

  1. Find the container by name or ID
  2. Enter the contaienr and remove any rules that block all inbound traffic
  3. Enter the contaienr and remove any rules that block all outbound traffic

License

See the LICENSE file.