Keios Bash ServerCMD

We use Ansible to manage our servers, but several years ago we have wrote the script, that adds some quick commands to workstation for interconnections with remote server. Script isn't really high-end and Ansible still looks like a better solution, but it became so handy in years that I keep using it, especially server-mount command.

What it does

Script will create three commands in /usr/local/bin :server_name - triggers quick ssh connection

server_name-cmd - sends remote command

server_name-mount - mounts / of the server in /media/server_name

It will also setup key-based SSH authentication.

Requirements

OpenVPN - for security reasons, workstation and the server should be in the same network. We think that no SSH port should be opened to public, never.

SSH Key - you can generate it with ssh-keygen -t rsa command, please store it in default location or change the script accordingly

sshpass - used as a temporary solution before key authentication is setup.

sshfs - used for ssh resources mounting.

Optional

server key accepted - to check if it is, simply try to connect with ssh to the server. when you do this first time, ssh will ask you to accept certificate with a message like that:

The authenticity of host '10.8.0.1 (10.8.0.1)' can't be established.    
ECDSA key fingerprint is aa:bb:cc:dd:ee:ff:gg:hh:ii:jj:kk:ll:mm:nn:oo:pp.   
Are you sure you want to continue connecting (yes/no)? 

If you do not have it accepted, script will ask you before setting up ssh key, but for the smooth script operation you may add it before adding script.

How to use

Replace SERVER variable in the line 2 of the script with your remote server name.

Replace TARGET_IP variable with remote server VPN IP.

Replace SOURCE_IP variable with your workstation VPN IP.

Comment out apt-get line if you don't have Debian/Ubuntu or already have sshpass and sshfs installed.

Save the script under server-install.sh and use chmod +x on it.

Run as root:

sudo su    
./server-install.sh

Script
SERVER="test_server"        
TARGET_IP="10.8.0.1"        
SOURCE_IP="10.8.0.6"        
USER="root"        
apt-get install sshpass sshfs        
#############################################        
clear         
echo "Welcome to $SERVER installator"        
echo        
echo "$SERVER root password:"        
read -s root_psw        
echo "ssh [email protected]$TARGET_IP" > /usr/local/bin/$SERVER        
echo "sshpass -p '$root_psw' ssh -X [email protected]$TARGET_IP \$1 \$2 \$3" > /usr/local/bin/$SERVER-cmd        
mkdir /media/$SERVER        
echo "sshfs $TARGET_IP:/ /media/$SERVER" > /usr/local/bin/$SERVER-mount        
chmod +x /usr/local/bin/$SERVER-mount        
chmod +x /usr/local/bin/$SERVER        
chmod +x /usr/local/bin/$SERVER-cmd        
$SERVER-cmd uname -a        
$SERVER-cmd echo "All OK."        
echo "Commands installed:"        
echo "$SERVER - connects with server"        
echo "$SERVER-cmd - sends command to server"        
echo "$SERVER-mount - mounts server in /media"        
echo        
echo "----------------------------"        
echo "Creating key authorization. Enter server root psw last time:"        
scp /$USER/.ssh/id_rsa.pub [email protected]$TARGET_IP:./temporary.pub        
$SERVER-cmd 'cat temporary.pub >> /root/.ssh/authorized_keys'        
$SERVER-cmd 'rm /root/temporary.pub'        
echo        
echo "Key authentication should be set. You should be able to use your server without password."        
echo "Updating $SERVER-cmd ..."        
echo "ssh -X [email protected]$TARGET_IP \$1 \$2 \$3" > /usr/local/bin/$SERVER-cmd        
echo