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Top Forums UNIX for Advanced & Expert Users script to monitor if ssh works. Post 302443480 by kumaran_5555 on Monday 9th of August 2010 03:27:17 AM
Old 08-09-2010
To cover all combinations, you could try using two loops,

the outer one will loop through the servers available(list of host names) and inner one will loop through the users available in the current server.

And execute simple ssh command for the user@host_name combination and check if it returns success, if yes then ssh connectivity is ok. otherwise report the combination tried in error log.

some thing like ssh_test.sh, copy this script to all your server or may be in a shared file system that can be accessed by all servers.
Code:
    for TO in server_list
    do
       for USER in current_server_user_list
       do
            # try ssh  $USER@$TO /shared_filesystem/ssh_test.sh & - as background process, and wait for a while to return
            # if that doesn't return (it may wait for password as the public has been changed)
            # then kill that process and make log to stdout that 
            # $HOSTNAME -> $USER@$TO Failed
            # if that process returns make a success log to stdout
            # in this case we would be having the remote server script's stdout log in this process.
            # $HOSTNAME -> $USER@$TO Success
          done
    done

By this we can collect the log message that was created by remote server in a single server that has started this script first.

I am not sure whether this would work or not.

But this is what i would have tried.

All the best.
 

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SSH-COPY-ID(1)						      General Commands Manual						    SSH-COPY-ID(1)

NAME
ssh-copy-id - install your public key in a remote machine's authorized_keys SYNOPSIS
ssh-copy-id [-i [identity_file]] [user@]machine DESCRIPTION
ssh-copy-id is a script that uses ssh to log into a remote machine (presumably using a login password, so password authentication should be enabled, unless you've done some clever use of multiple identities) It also changes the permissions of the remote user's home, ~/.ssh, and ~/.ssh/authorized_keys to remove group writability (which would oth- erwise prevent you from logging in, if the remote sshd has StrictModes set in its configuration). If the -i option is given then the identity file (defaults to ~/.ssh/id_rsa.pub) is used, regardless of whether there are any keys in your ssh-agent. Otherwise, if this: ssh-add -L provides any output, it uses that in preference to the identity file. If the -i option is used, or the ssh-add produced no output, then it uses the contents of the identity file. Once it has one or more fin- gerprints (by whatever means) it uses ssh to append them to ~/.ssh/authorized_keys on the remote machine (creating the file, and directory, if necessary) SEE ALSO
ssh(1), ssh-agent(1), sshd(8) OpenSSH 14 November 1999 SSH-COPY-ID(1)
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