I am comfortable with writing single queries. I am new to writing bash scripts trying to automate the daily stuff. I need help on creating a PowerShell or bash script where I can SSH to multiple Linux devices with same SSH key and then reboot the devices.
I access linux devices manually with the following command in PowerShell
ssh -i C:\<path-to-the-private-key\test.ppk [email protected]
(X - IP Address)
Then I enter the following command
sudo reboot
It asks me to type the password and then restarts the device.
I have 100 devices that I need to restart.
I can get a list of all IP address in a text file. How can we search for all the IP address in a text file, authenticate with the SSH private key and run the sudo command to restart the device?
Would it also be possible to throw a message if it was not able to restart a device?
Any help would be appreciated.
This is the script that I have.
testreboot.sh
#!/bin/bash
pw="test123"
hosts='IP.txt'
while read -r line; do {
/usr/bin/expect << EOF do
ssh test@"$hosts" 'sudo reboot'
expect "*?assword*"
send "%pw\r"
EOF
}
done < $hosts
IP.txt
XXX.XX.XX.XX
XXX.XX.XX.XX
XXX.XX.XX.XX
XXX.XX.XX.XX
I have Ubuntu 20.04 installed from Windows App Store. I am trying to run the testreboot.sh from PowerShell using the following command and get the following error message.
bash testreboot.sh
testreboot.sh: line 2: $'\r': command not found
testreboot.sh: line 3: $'\r': command not found
testreboot.sh: line 5: $'\r': command not found
testreboot.sh: line 16: syntax error near unexpected token `done'
testreboot.sh: line 16: `done < $hosts'
CodePudding user response:
A better solution to this problem is to use something like Ansible, Chef, or Puppet to solve these multi-server coordination needs.
CodePudding user response:
Here is an example in a shell script using expect to ssh to another server and login:
NOTE: When you use expect in this manner, you need to escape " and $ and other items. If password has $, it must be escaped.
This is where after logging in and expect see a command prompt For example:
44 [localhost.localdomain]/home/map%
This is where you would need to add sudo reboot
command
-re \"$reg_ex_prompt\" {
}
Test Script:
#!/bin/sh
#
debug=0
exit_val=0
spawn_item="ssh"
destination="user_name@<IP of server to shh>"
reg_ex_prompt='\[%|>|\$|#\] $'
#
# Change -D 0 to -D 1 to debug interactivly
#
expect -D $debug -c "
spawn $spawn_item $destination
set ret 1
set timeout 20
expect {
timeout {
send_user \"Timeout reached!\"
exit \$ret
}
eof {
puts \"End of test connection reached!\"
if { \$ret == 0 } {
puts \"Connection test Successful!\"
puts \"Exiting $destination ...\"
} else {
puts \"Connection Failure!\"
}
exit \$ret
}
\"Connection refused\" {
puts \"ERROR: Trouble connecting to $device_type_parm destination $destination\"
puts \"Aborting...\"
exit \$ret
}
\"Permission denied\" {
puts \"ERROR: User name or password is incorrect for $destination\"
puts \"Aborting...\"
exit \$ret
}
\"Connection reset by peer\" {
puts \"ERROR: Trouble connecting to $destination\"
puts \"Aborting...\"
exit \$ret
}
\"you sure you want to continue connecting\" {
send \"yes\r\"
exp_continue
}
\"assword:\" {
puts \"\r\nSending password\"
send \"password\\\$\r\"
exp_continue
}
\"Choice? \" {
send \"1\r\"
exp_continue
}
\"Q. Quit\" {
send \"q\r\"
exp_continue
}
-re \"$reg_ex_prompt\" {
send \"sudo reboot\r\"
sleep 2
set ret 0
exit \$ret
}
interact
} "
# get the exit value from expect statment above
exit_val=$?