SSH (Secure SHell) is a protocol for running commands on a remote computer.

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SSHFS specify key

I've got a question that I've not been able to find an answer for. I have two computers, both of which run Ubuntu Linux 12.04. I have set up my first computer ("home") to be able to SSH into my second ...
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530 views

Is it possible to use one SSH key per account for each account on a given remote server?

Suppose I have a number of accounts on a server called SERVER. Let's call them ACCOUNT1, ACCOUNT2 and ACCOUNT3. Suppose I don't want to have to type in the password for the account each time I ssh ...
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916 views

Should I be backing up my SSH host keys?

In my automated backups, I'm not sure if I should be doing this. If the hard drive fails or if I wipe the hard disk and start over, what will be the effect of starting with a new SSH host key to my ...
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549 views

Special character '#' in Perl SSH command

I try to send command using SSH in my perl script with # but it gets truncated right at # Example: Input text is : $message = "Product ID # STK000134" The SSH command is : $execute=`ssh -q ...
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Are there disadvantages in SSH tunneling?

I recently "bought" a VPS that I want to use as a Proxy to be able to use some sites and stuff that I can't reach from germany. Since I was yet too lazy to set up Squid and OpenVPN (which I ...
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1answer
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SSH over Socks proxy without username or password

I have a list of SOCKS proxy servers from this site. I've read about creating a dynamic tunnels with ssh -D and to be honest i've tried that already. Unfortunately for some reason I cannot connect to ...
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516 views

Send an email any time an SSH key is used

I have about 30 nearly-identical CentOS 6 servers that I need to be able to push out updated config files automatically using an rsa key to log in as root. Usually this will just be rsync, but ...
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SSH authentication: either SSH keys or one time password

I have an Ubuntu 10.04 Linux server that I normally ssh into (from my home machine) using ssh key authentication. However, sometimes I need to ssh remotely from potentially insecure machines (like ...
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Can I set my local machine's terminal colors to use those of the machine I ssh into?

I have a color scheme that I like for when I'm in a terminal, but I ssh into the machine I work on from multiple sources (locally, PuTTY, my netbook, etc.) and I want to maintain the same color scheme ...
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1answer
123 views

ssh from linux into mac - permission denied

I'm running a Oracle Linux VM on a Windows 7 host and I'm trying to ssh into my MacBook. I've already created the private/pub keys in my Mac. I have copied the id_rsa.pub contents into the ...
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430 views

Why not simply use %h in OpenSSH ssh's ControlPath option?

Why do the "ssh_config(5)" manpages recommend that the ControlPath option should contain at least the %h, %p and %r placeholders in order to uniquely identify each shared connection? I thought that ...
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X11 forwarding an OpenGL application from a machine running an NVIDIA card to a machine with an AMD card

I'm interested in forwarding an X11 session over SSH, in order to launch a remote process that utilizes OpenGL (specifically, gazebo for anyone familiar.) The problem that I seem to be running into ...
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1answer
206 views

Does fail2ban offer any additional protection to SSH if password login is already turned off?

I’m setting up a Debian VPS on Linode to use as a public web server, and I’m following their security suggestions. The last suggestion they make is to install fail2ban, to avoid dictionary attacks on ...
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SSH LocalCommand on exit

In ~/.ssh/config you can use the LocalCommand directive to execute a local command whenever you connect to a remote machine via SSH. But how do I execute a command when I exit an SSH connection? It ...
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2answers
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Giving some users only SSH and shell access with limited resource usage

I'm trying to make a user that can access my server through SSH and allow it to have a shell, limited to using only, say screen and irssi. And it shouldn't it be able to see other directories except ...
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How to debug SSH port forwarding

This is an extension to ssh port forward to access my home machine from anywhere I tried things mentioned there but I am not able to ssh to my machine. Netgear router settings for port forwarding: ...
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Configuring a vncserver so it's only accessible from my ssh tunnel

Since I use vnc through an ssh tunnel, is there any way I can block the open vnc port that the remote machine is listening on without it affecting my ability to use the ssh tunnel? Both machines are ...
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Why do I need to hit enter to get my shell prompt after my init.d script completes?

I had to write my own CentOS init.d script for celery because it only ships with one for Debian. You can see the script I wrote when I answered my own stack overflow question 3989656. But there's a ...
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A Web ssh/telnet client

I'm in kind of a tight spot right now. I wanted to know if someone has seen a HTML, or PHP web ssh client as both my company and school block everything besides port 80. I'm a control freak when it ...
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Why Bash unable to find command even if $PATH is specified properly?

I am specifying path to my command in the file /etc/profile: export PATH=$PATH:/usr/app/cpn/bin My command is located in: $ which ydisplay /usr/app/cpn/bin/ydisplay So, when I performing "echo ...
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423 views

firefox process dies after ssh log out on remote machine

I need to run firefox on a remote host via ssh and keep process running even after ssh logout. I already have tried these ways: nohup firefox & screen disown -h But it seems these work only ...
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3answers
882 views

How to add an ip range to known_hosts?

Many services (like GitHub) use a wide range of IPs, and obviously the same public key. How can I add an IP range (preferably in a single) to known_hosts file? For the GitHub example, it uses the ...
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1answer
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How to use ssh-agent with multiple (valid) keys and yet choose which one to use?

Let's say there are two keys A and B, both of which are valid for user@host public key authentication. Since authorized_keys is configured for different behaviour depending on the key, ~/.ssh/config ...
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How to speed up X over fast connection ? (especially over ssh)

What are recommendations on speeding up X applications over local fast (gigabit) connections? (similar question for slow connections) Currently I'm running over ssh -Y, which is fine, but I wonder if ...
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working with filenames in a different encoding over ssh

I'm ssh'ing to a remote system where a different encoding for the filenames (and for the users' locales) has been used. And this causes some problems. Problems solved by matching the locale settings ...
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1answer
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SSH not terminated after exit when there is X Forward program

After running X programs over SSH, SSH doesn't terminate after shell exit (have to use e.g. CtrlC to kill it). My guess is although the X program already exit, there is still some "connection" left ...
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1answer
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Waiting until SSH tunnel (ssh -w) is set up before running command

When using SSH VPN tunnelling (-w option), is there a way to know when the tunnel is actually up? I want to use this in a script that automatically sets up the tunnel by running ssh -w then running ...
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1answer
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Ssh audio redirection

I have DVB-T USB dongle plugged into my Linux server (GUI-less). It works correctly, but I want to stream TV programs from server to my PC. For this I use Kaffeine that way: ssh -X -p 666 -i ...
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1answer
93 views

Send only one warning when the private key is not available

For added security, I would like to require a private key to use sudo on my Ubuntu Server box. I've added private key authentication for sudo as described at ...
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392 views

ssh-agent: don't forward authentication for the whole keyring

I have two private ssh keys : one to access my personnal machines, one to access servers at my job. I add those two keys to my ssh-agent with ssh-add. Now, when I do ssh -A root@jobsrv I ...
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1answer
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SSH session pauses mid datastream; resumes with a keypress

I've had this problem occur at random, intermittently, across boxes at multiple companies, multiple distros, and multiple kernel revs. I think that I'm just cursed. What happens is that I'll have a ...
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caching a master passphrase on a linux server

I am trying to use keychain on debian latest stable with some difficulty. Searching online I could not find a solution, but thought perhaps a different approach or a different tool might be better in ...
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emacs syntax highlighting fails on my SSH client

I need to connect to a remote server by SSH to edit some documents. When I work at home, I SSH to the remote server using SSH Secure Shell and open emacs, but it doesn't fully highlight documents as I ...
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Enabling system management privileges for non-local users - How the heck does `polkit` work, anyways?

I am managing a CentOS 6.2 server remotely using X over SSH (actually NX, but that's just a proxy). The Everything is working correctly, except when I try to do tasks that would normally require ...
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XAUTHORITY environ variable set repeatedly on every login

I am running a Suse Linux 11.04 system. My problem is that when I do a fresh login into a shell as root, a new Xauthority file of the form xauth***** gets created in the /root/ directory. Upon exiting ...
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Remote-Accesible Live-Distribution (aka Live CD)

I'm looking for a live distribution (Live CD or the likes) which comes - per default - with sshd running at startup. I want to check the components of my laptop whose graphics has died ...
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3answers
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Shell Script for logging into a ssh server

I tried writing a shell script which can do automatic login into a ssh server using password which is mentioned in the script. I have written the following code: set timeout 30 /usr/bin/ssh -p 8484 ...
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I messed up my zshrc on a remote server and now I can't run any commands!

On a remote machine I changed my zsh settings and it is now broken, for every keypress it says: "url-quote-magic:1: url-quote-magic: function definition file not found " I don't have another ...
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Multiple SSH private keys, possible?

Is it possible to have multiple SSH key in a single client, and let ssh choose the right one automatically?
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What causes a ssh interruption?

What exactly causes a ssh connection to interrupt? When you idle for a while, it disconnects. How do I keep the connection alive (without autossh or reconnect)?
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What do the channel numbers in ssh error message refer to?

In the example below what do the channel numbers correspond to? Which are on the server? Which are on the client? $ ssh -L1570:127.0.0.1:8899 root@thehost Password: Last login: Fri Aug 9 ...
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Disable user shell for security reasons

We have several user accounts that we create for automated tasks that require fine-grained permissions, such as file transfer across systems, monitoring, etc. How do we lock down these user accounts ...
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Multiple ssh sessions in single command

I'm trying to copy a database from one server to another. I tried using the following command and it's getting tied up on entering the ssh passwords. If I put in one server's password, it complains ...
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4answers
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What are the different ways that a message can be displayed to a bash shell after a user logs in?

I have a CentOS 5.7 VPS using bash as its shell that displays a branded greeting immediately after logging in via SSH. I've been trying to modify it, but can't seem to find where it is in the usual ...
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2answers
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How to configure SVN/SSH with SSH on non standard port?

I have configured SSH to be on port 20000. When I try: svn co svn+ssh://server.com:20000/home/svn/proj1 proj1 --username jm I get svn: To better debug SSH connection problems, remove the -q ...
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How many users does Linux support being logged in at the same time via SSH?

I know Linux supports multiple users being logged in at the same time. But what's the maximum number of users that can be logged into Linux at the same time? I see there are there are 69 tty files ...
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How to setup password-less ssh with RSA keys

I am trying to setup a password-less SSH configuration between two machines and am having trouble. There are a ton of howtos out there that I have followed and have had no success. Here are ...
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How to properly run “top” command through SSH?

I have to run top command on one computer being on another. My targeted PC has IP 192.168.0.81 I was trying to do it: ssh 192.168.0.81 top But I got this result: top: tcgetattr() failed: Invalid ...
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Keep running a script via ssh

ssh can use to run remote commands. ssh me@server.com 'long-script.sh' I run a long script that will take a lot of time, but I want to close my computer and keep running the script in the remote ...
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How to pull a file from a server using scp?

I am on machine A and want to pull a file from machine B. A$ scp <myuserid>@hostB:<path of file in B> . it says that: scp: <path of file in B>: No such file or directory But on ...