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Alias for ssh client to autofill subnet – CentOS

I’d like to be able to run ssh 142 (for example) from a bash prompt and have it automatically expand to ssh 10.33.7.142. I’m thinking I should be able to do this from .bashrc, but I can’t figure out how to detect if a command-line argument is a single octet, and if so, automatically add a subnet before it.

I’d like to implement this on my CentOS LXC host nodes. The vast majority of the time when ssh is used on them it is to connect to a container running on them, all of which are in the same subnet.

Thank you.

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2

Answers


  1. 0

    In ~/.ssh/config or /etc/ssh/ssh_config : 

    Host 142
Hostname 10.33.7.142

    Now you can run :

    ssh 142

    To generate the config file :

    #!/bin/bash

while read host; do
    echo -e "Host $hostnHostname 10.33.7.$hostn"
done < <(printf '%sn' {1..254})
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  2. 0

    You could write a function in your .bashrc like this:

    ssh=$(which ssh) # the real ssh binary
ssh(){
  if [[ "$1" =~ ^[0-9]+$ ]]; then # if first arg to ssh is an integer
    $ssh 10.33.7.$1               # then ssh with prepended subnet
  else
    $ssh $@                       # else just do some regular ssh
  fi
}
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