10-14-2008
Are the machines using DHCP to get their network addresses? If not, I can see where there might be a problem.
Also, if you clone the machines, you're also cloning their SSH private keys. This would cause a problem. (Unless your SSH rc scripts generate their keys on first boot and you remembered to clone the system and remove the original keys).
Also your tar command might not handle: sockets, devices, named pipes. You should check to see if devices were correctly carried over.
Finally, did you overwrite the boot sector so that it can find the new kernel? This is OS dependent.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
What is the correct mkfs syntax to create mirrored disk files systems? I need to make the file system 20gb. For example:
machine# mkfs -F ufs /dev/md/dsk/d40
size not specified
ufs usage: mkfs special size(sectors) \
-m : dump fs cmd line used to make this partition
-V : print this... (4 Replies)
Discussion started by: GLJ@USC
4 Replies
2. UNIX for Dummies Questions & Answers
I'm new to Unix, :confused:
What is a TAR Command? What does it do? I need simple explanation. (4 Replies)
Discussion started by: technie07
4 Replies
3. Shell Programming and Scripting
Hi
I am very poor at scripting.:o
I need to develop a script that should tar up all the filesystems on the machine on to a single filesystem called /tarfilesystem.
Any suggestions ...
Thank You very much (1 Reply)
Discussion started by: urrahman_zia
1 Replies
4. UNIX for Dummies Questions & Answers
Hi all,
4 files are returned when i issue 'find . -mtime -1 -type f -ls'.
./ora_475244.aud
./ora_671958.aud
./ora_934052.aud
./ora_934050.aud
However, when I issued the below command:
tar -cvf test.tar `find . -mtime -1 -type f`, the tar file only contains the 1st file -... (2 Replies)
Discussion started by: ahSher
2 Replies
5. UNIX for Dummies Questions & Answers
As you will verify, I am a really naive user of AIX 5.1. As such I wonder if you could possibly let me know of a command or procedure I could use to automatically, globally and safely, remove all useless files from my machine. I'm not referring to my own files because I perfectly know which of them... (1 Reply)
Discussion started by: ahjchr
1 Replies
6. Shell Programming and Scripting
HI,
if I have a tarfile called pmapdata.tar that contains
tar -tvf pmapdata.tar
-rw-r--r-- 0/0 21 Oct 15 11:00 2009 /var/tmp/pmapdata/pmap4628.txt
-rw-r--r-- 0/0 21 Oct 14 20:00 2009 /var/tmp/pmapdata/pmap23752.txt
-rw-r--r-- 0/0 1625 Oct 13 20:00 2009... (1 Reply)
Discussion started by: borderblaster
1 Replies
7. What is on Your Mind?
I have been wondering how do Systems Administrators do the jump into Systems Engineering? Is it only a matter of time and experience or could I actually help myself get there?
Opinions? Books I could read?
Thanks a lot for your help! (0 Replies)
Discussion started by: svalenciatech
0 Replies
8. Shell Programming and Scripting
Hi all,
I have a tar file and inside that tar file is a folder with additional tar.gz files. What I want to do is look inside the first tar file and then find the second tar file I'm looking for, look inside that tar.gz file to find a certain directory. I'm encountering issues by trying to... (1 Reply)
Discussion started by: bashnewbee
1 Replies
9. Shell Programming and Scripting
I have a tar file that contains multiple .Z files. Hence I need to issue a tar command followed by a gzip command to fully extract the files. How do I do it in a single command?
What I'm doing now is
tar xvf a.tar (this will output 1.Z and 2.Z)
gzip -d *.Z (to extract 1.Z and 2.Z) (9 Replies)
Discussion started by: ericlim
9 Replies
10. UNIX for Dummies Questions & Answers
Hello Team,
Would you please help me with a UNIX command that would check if file is a tar file.
if we dont have that , can you help me with UNIX command that would check if file ends with .tar
Thanks in advance. (10 Replies)
Discussion started by: sanjaydubey2006
10 Replies
LEARN ABOUT MOJAVE
ssh-keyscan
SSH-KEYSCAN(1) BSD General Commands Manual SSH-KEYSCAN(1)
NAME
ssh-keyscan -- gather SSH public keys
SYNOPSIS
ssh-keyscan [-46cDHv] [-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, the format of which is documented in sshd(8). 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 sshd(8). 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 Force ssh-keyscan to use IPv4 addresses only.
-6 Force ssh-keyscan to use IPv6 addresses only.
-c Request certificates from target hosts instead of plain keys.
-D Print keys found as SSHFP DNS records. The default is to print keys in a format usable as a ssh(1) known_hosts file.
-f file
Read hosts or ``addrlist namelist'' pairs from file, one per line. If '-' is supplied instead of a filename, ssh-keyscan will read
from the standard input. Input is expected in the 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
-H Hash all hostnames and addresses in the output. Hashed names may be used normally by ssh(1) and sshd(8), but they do not reveal
identifying information should the file's contents be disclosed.
-p port
Connect to port 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, the connection is closed and the host in question considered unavailable. The default is
5 seconds.
-t type
Specify the type of the key to fetch from the scanned hosts. The possible values are ``dsa'', ``ecdsa'', ``ed25519'', or ``rsa''.
Multiple values may be specified by separating them with commas. The default is to fetch ``rsa'', ``ecdsa'', and ``ed25519'' keys.
-v Verbose mode: print debugging messages about progress.
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
/etc/ssh/ssh_known_hosts
EXAMPLES
Print the RSA host key for machine hostname:
$ ssh-keyscan -t rsa 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,ecdsa,ed25519 -f ssh_hosts |
sort -u - ssh_known_hosts | diff ssh_known_hosts -
SEE ALSO
ssh(1), sshd(8)
Using DNS to Securely Publish Secure Shell (SSH) Key Fingerprints, RFC 4255, 2006.
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.
BSD
March 5, 2018 BSD