easyssh-go

#+TITLE: easyssh with tags
#+DATE: Thu May  3 14:34:45 +0545 2018
#+DESCRIPTION: sick of static configs

* EasySSH revised
  Refresher to build a more-friendly ssh generator.
  Most of the code is seamlessly copied from my old [[https://github.com/thapakazi/gosack/blob/5f8f83e61698cea0b092dbf35cd2e95e950ea23e/ssh_config_gen_aws/Readme.org][repo]]

  Changelog:
  - v2: revised with more better options, verbosity and independed pkg
  - v1: simple POC version of easy ssh
* How to use it ?
  docs on the way, hold your horses... or figure it out on your own ;)
* Assumptions
  - aws configs{keys, regions} are exported well
  - you will help me clean/review it someday in future
    #+BEGIN_SRC bash
      export AWS_ACCESS_KEY=my_aws_keys
      export AWS_ACCESS_KEY_ID="${AWS_ACCESS_KEY}"

      export AWS_SECRET_KEY=my_dirty_secrets
      export AWS_SECRET_ACCESS_KEY="${AWS_SECRET_KEY}"

      #region
      export EC2_REGION="my_regions-1"
      export AWS_REGION="${EC2_REGION}"
      export EC2_URL="http://ec2.${EC2_REGION}.amazonaws.com"
    #+END_SRC
* Breakdown
*** Basic usage is like  
  #+BEGIN_SRC bash
    ./easyssh -h                            
      Usage of ./easyssh:
	-end_msg="##END OF GENERATED SSH CONFIG##": custom comment end msg
	-port="22": ssh port to knock
	-start_msg="##START OF GENERATED SSH CONFIG##": custom comment msg at start of generated ssh config
	-username="ubuntu": ssh username to login as
  #+END_SRC

  where,
  - *-end_msg & -start_msg* : custom msg to put at start and end of
    generated config, useful if you have multiple configs
  - *-username & -port* : self explainator; custom username and port
*** one more dependency
    For seamless ssh, bastion is used and the trick is:
  #+BEGIN_EXAMPLE
Host !my_bastion_host*
  ProxyCommand ssh -W %h:%p my_bastion_host
  User ubuntu
  Port 22
  ForwardAgent yes
#+END_EXAMPLE
  where,
  - *my_bastion_host** : my bastion host i use to ssh to vpc instances

  So put/modify somewhere in your `~/.ssh/config`