Bash Script to check Remote Host Connection

zulfikarmd · #1 (**permalink**) 04-16-2008

Hi all,

Can anyone tell/guide me how to check remote host is up/running using bash script?

Thanks.
Zulfiqar

era · #2 (**permalink**) 04-16-2008

Define "up and running".

Code:

ping -c 1 remotehost || { echo "does not respond to ping" >&2 ; exit ; }
rup remotehost || { echo "no rup" >&2; exit; }
# if you have netcat, and ssh on port 22 on remotehost
nc -z remotehost 22 || { echo "nobody home on port 22" >&2; exit; }
ssh remotehost true || { echo "does not let me in" >&2; exit; }

If you want to check port 80 instead, try to fetch a web page, etc.

This obviously also depends on firewall blocks and stuff like that.

zulfikarmd · #3 (**permalink**) 04-16-2008

Thanks Era. By "Up and Running" I mean i should be able to scp necessary file from that machine to other machine. Hope this helps.

Thanks again for your help.

Regards.
Zulfiqar

era · #4 (**permalink**) 04-16-2008

By that definition, if your scp fails, it's not.

Code:

if scp remotemachine:path/to/file here/
then
  # it's up and running! whee
else
  echo "could not scp: $?" >&2
  exit $?
fi

You might still want to check if it's responding to ping and accepting connections on port 22 before attempting the actual copy, but in practice, often all you really care about anyway is whether the copy succeeded or not.

zulfikarmd · #5 (**permalink**) 04-16-2008

Thanks Era. But this script would just check scp is successful or not. But What I want is to see if remote host is able to accept connection before doing scp.

Thanks.
Zulfiqar

era · #6 (**permalink**) 04-16-2008

If you can ssh, you can scp.

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