Questions Tagged With ssh

how to define variable in ssh

zwang10 — Thu, 23 Apr 2015 17:12:38 -0400

I need to use ssh to send command to different computers to run programs. Can I define a variable of Directory and program in front of this shell script? Then, I do not need to write them every time?

host_list=("c15-0330-10.ad.mtu.edu" "c15-0330-11.ad.mtu.edu" "c15-0330-12.ad.mtu.edu") # I have multiple programs # program=c("L_1","L_2","L_3") ssh -f "${host_list[0]}" 'set Directory="/home/campus27/zwang10/Desktop/AWRR/program/power/vmodel_1/nprot/K_10"; cd $Directory && nohup Rscript L_1.R> L_1_sh.txt;echo "The job L_1 is finished" |mutt "zwang10@mtu.edu" -s "The job L_1 is finished"'; ssh -f "${host_list[1]}" 'set Directory="/home/campus27/zwang10/Desktop/AWRR/program/power/vmodel_1/nprot/K_10"; cd $Directory && nohup Rscript L_2.R> L_2_sh.txt;echo "The job L_2 is finished" |mutt "zwang10@mtu.edu" -s "The job L_2 is finished"'; ssh -f "${host_list[2]}" 'set Directory="/home/campus27/zwang10/Desktop/AWRR/program/power/vmodel_1/nprot/K_10"; cd $Directory && nohup Rscript L_3.R> L_3_sh.txt;echo "The job L_3 is finished" |mutt "zwang10@mtu.edu" -s "The job L_3 is finished"';

Can i switch to a timed out ssh session?

electronbender — Tue, 12 Apr 2011 14:54:27 -0400

I got timed out of a ssh session. Is there a way I can switch back to it if it still exists?

NFS over SSH. RPC Error

Dave 1 — Tue, 24 Aug 2010 17:50:10 -0400

Hi,

I have seen many articles saying that to get rid of this error I should be using portmap, that's fine but how do I use it over ssh...

I am trying to mount NFS over SSH. I have the server configured to export the share and I can mount it correctly over the network, however company policy is to ONLY allow ssh access.

On the server side; ]# cat /etc/exports

/home/Shared localhost(rw,no_root_squash,async)

]# rpcinfo -p

program vers proto port

100000    2   tcp    111  portmapper
100000    2   udp    111  portmapper
100024    1   udp  49449  status
100024    1   tcp  36697  status
100021    1   udp  34934  nlockmgr
100021    3   udp  34934  nlockmgr
100021    4   udp  34934  nlockmgr
100021    1   tcp  37221  nlockmgr
100021    3   tcp  37221  nlockmgr
100021    4   tcp  37221  nlockmgr
100003    2   udp   2049  nfs
100003    3   udp   2049  nfs
100003    4   udp   2049  nfs
100003    2   tcp   2049  nfs
100003    3   tcp   2049  nfs
100003    4   tcp   2049  nfs
100005    1   udp   2051  mountd
100005    1   tcp   2051  mountd
100005    2   udp   2051  mountd
100005    2   tcp   2051  mountd
100005    3   udp   2051  mountd
100005    3   tcp   2051  mountd

The on the client side I use 2 ssh tunnels;

]# ssh -f -N -L 52051:localhost:2051 my.server

]# ssh -f -N -L 52049:localhost:2049 my.server

I can telnet to these ports and receive a response. So now I try to mount;

]# mount -t nfs -o nolock,port=52049,mountport=52051 localhost:/home/Shared /mnt/Shared

mount.nfs: mount to NFS server 'localhost:/home/Shared' failed: RPC Error: Program not registered

So it seems as if the problem is caused by mount talking to the local portmap, however I thought the mount options were supposed to stop that. Obviously I cannot forward portmapper from the server to the client's port 111 as that would disrupt the client's portmapper.

I am using SUSE 11.2 for the client and Ubuntu 10.04 as the server.

chroot FTP vs SFTP

ranxxerox — Mon, 10 May 2010 16:21:18 -0400

Is there any advantage in using an FTPd in a chroot environment over using SFTP that is standard with SSHd?

Connect via SSH/Samba from 1 box to a hidden box (NAT/PAT?) setup?

Ian Vaughan — Wed, 28 Apr 2010 17:02:58 -0400

I need to access a Linux box via SSH & Samba that is hidden/connected behind another one.

Setup :-

  
 A        switch    B         C
|----|    |---|    |----|    |----|
|eth0|----|   |----|eth0|    |    |
|----|    |---|    |eth1|----|eth1|
                   |----|    |----|

Eg, SSH/Samba from A to C

How does one go about this?
I was thinking that it cannot be done via IP alone? Or can it?

Could B say "hi on eth0, if your looking for 192.168.0.2, its here on eth1"?
Is this NAT? This is a large private network, so what about if another PC has that IP?!

More likely it would be PAT?
A would say "hi 192.168.109.15:1234"
B would say "hi on eth0, traffic for port 1234 goes on here eth1"
How could that be done?

And would the SSH/Samba demons see the correct packet header info and work??

IP info :-

A - eth0 - 192.168.109.2
B - eth0 - 192.168.109.15
  - eth1 - 192.168.0.1
C - eth1 - 192.168.0.2

A, B & C are RHEL (RedHat) But Windows computers can be connected to the switch. I configured the 192.168.0.* IPs, they are changeable.

Any help?