How do i manage my ssh

Introduction

I have a number of servers I need to connect to via the secure shell (SSH), and typing in the IP address or host name by hand every time. I could use an application for that, but that’s bloat. Let’s instead see how we can leverage small universal tools to build an elegant solution of our own instead.

Since i have to use the terminal when using SSH anyway, i will create a command-line tool using FZF which lets us type the partial name of a host and make a selection. Here is what the end result will look like:

Script1

Host Vutrl
    HostName 45.32.21.40
    User root
    Compression yes
    ForwardX11 yes

Host Alicloud
    HostName 49.235.215.98
    User root
    Compression yes
    ForwardX11 yes

Host test-server1
    HostName 192.168.3.101
    User root
    Compression yes
    ForwardX11 yes

Some explainations:

Host your-server-name it is your custom name.

save this and name it config store the path ~/.ssh.

Script2:

# Search the input (and SSH config file) for a given HOST and print all the
# host's settings in a tabular form to standard output. The HOST must be
# provided as a global variable to the Awk process.

BEGIN {
    n = 0  # Explicitly initialise as a number instead of empty string
}

# Skip comments
/^$/ || /^#/ {
    next
}

# A new host definition after we found our host terminates
($1 == "Host" || $1 == "Match") && did_find_host {
    exit
}

# Keep searching until we found our host
$1 == "Host" && $2 ~ HOST {
    did_find_host = 1
    next
}

# Accumulate all settings and their values for our host, ordered by their
# appearance in the input
did_find_host {
    keys[n] = $1
    values[n++] = $2
    width = max(length($1), width)  # Width of the widest key for padding
}

END {
    for (i = 0; i < n; ++i)
        printf "%-"width"s  %s\n", keys[i], values[i]
}

function max(a, b) {
    return a > b ? a : b
}

Some explainations:

save this and create a direactoty named bin storing in path ~/.ssh.

named above scripts host2conf.awk and store it in path ~/.ssh/bin.

Script3

#!/usr/bin/env sh

export FZF_DEFAULT_OPTS='
--height=20%
--reverse
--prompt="SSH > "
--preview="awk -v HOST={} -f ~/.ssh/bin/host2conf.awk ~/.ssh/config"'

host=$(grep '^[[:space:]]*Host[[:space:]]' ~/.ssh/config | cut -d ' ' -f 2 | fzf)
[ $? -eq 0 ] && ssh "$host"

Some explainations:

This scripts is a program startup file and you can name it startup.sh

Run bash ~/.ssh/startup.sh and enjoy ssh selector!