ish

Instance-SSH ...ish.

ish connects you to a server in your AWS account based on properties of the server. Notably useful when you don't care which server exactly, just a server of a particular type.

Currently you can connect to servers based on their:

• name tag
• environment tag
• instance id
• autoscaling group membership
• opsworks instance name (oin)
• opsworks stack name (ois)
• image id (AMI)

If more than one server matches the attribute, it will pick one and connect you to it.

If you pass additional parameters, they will get appended to the ssh command.

In the example command, /usr/bin/ssh ip_address echo "hello_there" is the run command:

$ ish name:openvpn echo "hello there"
hello there

ish also supports autocompletion (read below.)

Installation

You can install via:

• setuptools using python3 setup.py install and source the contrib/ish-autocomplete script.
• Homebrew using brew install https://raw.githubusercontent.com/grahamc/ish/master/ish.rb

Details

Caching

To improve performance, instance metadata is stored in $HOME/.ish.json. This file should be automatically replaced if it is over 60 seconds old, but delete it if you experience issues.

AWS Configuration

ish uses boto3 which uses the standard AWS configuration stack. Read more here: https://boto3.readthedocs.org/en/latest/guide/configuration.html#configuration-sources

SSH Configuration

The command run is ssh IP. If you want to set additional configuration settings, please use your ~/.ssh/config.

An example SSH configuration might be

Host 172.*
    StrictHostKeyChecking no
    IdentityFile ~/.ssh/keys/aws-keys
    User yourusername

ish connects to the private instance IP

You might find this article helpful if you use a bastion / jump-host instead of a VPN: http://edgeofsanity.net/article/2012/10/15/ssh-leap-frog.html

Autocomplete

A full list of supported targets can be found with ish --completion, and a bash and zsh compatible autocomplete script is found in ./contrib/.

Auto-completing targets with spaces in them

Targets with spaces in them must be quoted, but will be autocompleted without them. Example:

$ ish name:Logstash Ingestion

Contributing

• flake8 must pass with no exceptions
• coverage must report 100% coverage
• it must run perfectly on python 3, python 2 is not supported.