Adds new SSH Keys to multiple servers and checks the connection. SSH Keys will not be duplicated if exists.

add-keys-to-servers.sh

#!/bin/bash

# Install: Download and add execution permissions
#
# Usage:   ./add-keys-to-servers "current-private-key-to-connect" "new-private-key-to-add" "servers.list"
#
# First parameter must be the current available key to connect to servers
# Second parameter must be the new key to add to servers
# Third parameter must be the servers list (One line for server with format: hostname,port)

error() {
        echo ''
        echo $1
        echo ''

        exit 1
}

if [ "$1" == "" ] || [ ! -f "$1" ]; then
        error '[REQUIRED] First parameter must be the current available key to connect to servers'
fi

if [ "$2" == "" ] || [ ! -f "$2" ] || [ ! -f "$2.pub" ]; then
        error '[REQUIRED] Second parameter must be the new key to add to servers'
fi

if [ "$3" == "" ] || [ ! -f "$3" ]; then
        error '[REQUIRED] Third parameter must be the servers list (One line for server with format: hostname,port)'
fi

servers=$(cat "$3")
current="$1"
new="$2"
key=$(cat "$new.pub")

for server in $servers; do
        echo ''
        echo 'ADDING KEY TO '$server

        host=$(echo $server | awk -F, '{print $1}')
        port=$(echo $server | awk -F, '{print $2}')

        ssh -i "$current" -o StrictHostKeyChecking=no -o ConnectTimeout=10 -p $port $host '
                if [ ! -f .ssh/authorized_keys ] || [ "$(grep "'$key'" .ssh/authorized_keys)" = "" ];
                        then $(echo "'$key'" >> .ssh/authorized_keys);
                fi
        '
        echo 'CHECKING CONNECTION '$server

        ssh -i "$new" -o BatchMode=yes -o ConnectTimeout=10 -p $port $host echo "CONNECTION OK" 2>&1
done

echo ''
echo 'FINISH'
echo ''

exit 0