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SSH Config

serhatteker profile image Serhat Teker Originally published at tech.serhatteker.com on ・1 min read

We saw that we can ssh into our vagrant virtual machine in the post Add SSH Public Key to Vagrant:

$ ssh -i ~/.ssh/id_rsa.pub -p 2222 vagrant@localhost
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However it is too long to type, right? And if you ssh into a server you should remember the IP, like 173.108.251.102. There should be an easy way to do that since we all are lazy developers (?).

The ssh program on a host receives it's configuration from either the

  1. cli (as we've seen above),
  2. /etc/ssh/ssh_config file for global-scope,
  3. ~/.ssh/config file for user-scope.

These files are formatted like below:

For our local vagrant machine:

Host vagrantlocal
  HostName localhost
  Port 2222
  User vagrant
  IdentityFile ~/.ssh/id_rsa.pub
  PasswordAuthentication no
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For a remote server:

Host myremoteserver
  HostName 173.108.251.102
  User user
  IdentityFile ~/.ssh/id_rsa.pub
  PasswordAuthentication no
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And then you can access them via ssh:

# vagrant virtual machine
$ ssh vagrantlocal

# remove server
$ ssh myremoteserver
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You can see more configuration file options at Configuration Options.

All done!

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