Ok. Assuming that ssh is listening on port 22 in each of those hosts, and that the file hosts.txt contains a list of IP addresses or hostnames this is what I'd do:
Let me know if this works for you. Good luck.
I am trying to write a script that logs into an SMTP server and authenticates as a user or verifies that a user exists. I can do all this from the command line but I don't know how to write a script to do this for me, I login and then the script stops, I'm sure this is some basic principle. ... (3 Replies)
I want to log into a remote server transfer over a new config and then backup the existing config, replace with the new config.
I am not sure if I can do this with BASH scripting.
I have set up password less login by adding my public key to authorized_keys file, it works.
I am a little... (1 Reply)
I want to write a script which would run from one host say A and connect to other remote host B and then run rest of commands in that host. I tried connecting from A host to B with SSH but after connecting to host B it just getting me inside Host B command prompt. Rest of the script is not running... (6 Replies)
Gurus/Experts
We have a centralized UNIX/Solaris server from where we can actually ssh to all other UNIX/Solaris servers...I need to write a script that reside on this centerlized server and do FileSystem monitoring (basically run df -h or -k) of other remote servers and then send an email to me... (6 Replies)
Hi,
I earlier determined I cannot use FTP to execute remote commands on a server.
My problem, I need to use a second server to get/put files via ftp onto my primary server and various tertiary servers.
my server(A) ---> server (B) ----> server blah(c), server balh(C)
I cannot directly... (1 Reply)
I am automating the SFTP keys setp process:
So i created the expect script for controlling the output of shell
below is my main code:
#!/usr/bin/expect
set fd
set password
close $fd
set df
set app
close $df
spawn ssh servername << pb
Pb file:
set df
set app
close $df (4 Replies)
Hi,
The below command is not giving me the count , Can somebody help me in re-writing this pls .
Proc_Exist=`ssh -q -o "BatchMode=yes" -o "PasswordAuthentication=no" $OAUSER@${Primary_Node} ps -ef |
grep -v grep | grep "${ICM_Proc}" |wc -l `
Also the same problem with below... (13 Replies)
How should i make the following code working
#!/bin/bash
INPUTFILE="test.txt"
while read STRING; do
IP=`host -t A $STRING | awk '{print $NF}'`
HOSTNAME=`ssh -oPasswordAuthentication=no -oStrictHostKeyChecking=no $IP "hostname"`
echo $HOSTNAME > out.txt
done < $INPUTFILE
At this moment while... (3 Replies)
I need to copy python script file to around 100 servers using expect script.
1. Copy script to my user home first(/home/myhome) on each remote server
2. change permissions on copied file to 766.
3. sudo to appuser1 account on remote server. copy script file from my user home to /usr/bin/... (1 Reply)
Discussion started by: kchinnam
1 Replies
LEARN ABOUT SUSE
ssh-keyscan
SSH-KEYSCAN(1) BSD General Commands Manual SSH-KEYSCAN(1)NAME
ssh-keyscan -- gather ssh public keys
SYNOPSIS
ssh-keyscan [-46Hv] [-f file] [-p port] [-T timeout] [-t type] [host | addrlist namelist] ...
DESCRIPTION
ssh-keyscan is a utility for gathering the public ssh host keys of a number of hosts. It was designed to aid in building and verifying
ssh_known_hosts files. ssh-keyscan provides a minimal interface suitable for use by shell and perl scripts.
ssh-keyscan uses non-blocking socket I/O to contact as many hosts as possible in parallel, so it is very efficient. The keys from a domain
of 1,000 hosts can be collected in tens of seconds, even when some of those hosts are down or do not run ssh. For scanning, one does not
need login access to the machines that are being scanned, nor does the scanning process involve any encryption.
The options are as follows:
-4 Forces ssh-keyscan to use IPv4 addresses only.
-6 Forces ssh-keyscan to use IPv6 addresses only.
-f file
Read hosts or addrlist namelist pairs from this file, one per line. If - is supplied instead of a filename, ssh-keyscan will read
hosts or addrlist namelist pairs from the standard input.
-H Hash all hostnames and addresses in the output. Hashed names may be used normally by ssh and sshd, but they do not reveal identify-
ing information should the file's contents be disclosed.
-p port
Port to connect to on the remote host.
-T timeout
Set the timeout for connection attempts. If timeout seconds have elapsed since a connection was initiated to a host or since the
last time anything was read from that host, then the connection is closed and the host in question considered unavailable. Default
is 5 seconds.
-t type
Specifies the type of the key to fetch from the scanned hosts. The possible values are ``rsa1'' for protocol version 1 and ``rsa''
or ``dsa'' for protocol version 2. Multiple values may be specified by separating them with commas. The default is ``rsa''.
-v Verbose mode. Causes ssh-keyscan to print debugging messages about its progress.
SECURITY
If an ssh_known_hosts file is constructed using ssh-keyscan without verifying the keys, users will be vulnerable to man in the middle
attacks. On the other hand, if the security model allows such a risk, ssh-keyscan can help in the detection of tampered keyfiles or man in
the middle attacks which have begun after the ssh_known_hosts file was created.
FILES
Input format:
1.2.3.4,1.2.4.4 name.my.domain,name,n.my.domain,n,1.2.3.4,1.2.4.4
Output format for rsa1 keys:
host-or-namelist bits exponent modulus
Output format for rsa and dsa keys:
host-or-namelist keytype base64-encoded-key
Where keytype is either ``ssh-rsa'' or ``ssh-dss''.
/etc/ssh/ssh_known_hosts
EXAMPLES
Print the rsa host key for machine hostname:
$ ssh-keyscan hostname
Find all hosts from the file ssh_hosts which have new or different keys from those in the sorted file ssh_known_hosts:
$ ssh-keyscan -t rsa,dsa -f ssh_hosts |
sort -u - ssh_known_hosts | diff ssh_known_hosts -
SEE ALSO ssh(1), sshd(8)AUTHORS
David Mazieres <dm@lcs.mit.edu> wrote the initial version, and Wayne Davison <wayned@users.sourceforge.net> added support for protocol ver-
sion 2.
BUGS
It generates "Connection closed by remote host" messages on the consoles of all the machines it scans if the server is older than version
2.9. This is because it opens a connection to the ssh port, reads the public key, and drops the connection as soon as it gets the key.
BSD January 9, 2010 BSD