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linux_ssh_access [2021/03/04 18:18] – pgh5alinux_ssh_access [2023/08/29 15:56] (current) – external edit 127.0.0.1
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 +==== Linux Server Access ====
 +
 +All Linux servers run "secure shell" (//ssh//).  Anyone with a CS account may log into the department's servers. 
 +
 +Users on a Windows PC can use a Terminal application like //SecureCRT, Cmder, KiTTY, or Putty// to //ssh// to our servers.
 +
 +Users on a Mac can use an application like //Terminal// or //iTerm2// to //ssh// to our servers.
 +
 +If you'd like to use a graphical windowing interface to our servers, see: [[nx_lab|Nomachine Remote Desktops]]
 +
 +=== On Grounds ===
 +You can //ssh// to CS servers.
 +
 +Use your CS domain userid (identical to your UVA userid) and password to //ssh// to ''%%portal%%''. For example:
 +
 +''%%ssh -l abc1de portal.cs.virginia.edu%%''. Alternatively, ''%%ssh abc1de@portal.cs.virginia.edu%%''
 +
 +=== Off Grounds: Option 1: VPN access ===
 +
 +Start a VPN session to UVA using the [[https://virginia.service-now.com/its?id=itsweb_kb_article&sys_id=f24e5cdfdb3acb804f32fb671d9619d0|UVA VPN]]. Once the VPN is established, you can //ssh// to CS servers directly. Note that you should use the UVA "Anywhere" VPN, not the "More Secure" VPN.
 +
 +=== Off Grounds: Option 2: ssh to portal.cs.virginia.edu ===
 +
 +You can //ssh// directly into ''%%portal.cs.virginia.edu%%'' without having to use the UVA VPN.  Once you are logged into the ''%%portal%%'' cluster, you can then //ssh// to other CS servers. //Your username on the Mac or PC may be different from your CS/UVA userid. So be sure to include your CS/UVA userid on the ''ssh'' command line.//
 +
 +For example:
 +<code>
 +[abc1de@outside-uva ~]$ ssh abc1de@portal.cs.virginia.edu
 +abc1de@portal.cs.virginia.edu's password: 
 +Last login: Mon Jul 29 14:12:10 2021
 +abc1de@portal04 ~ $ hostname
 +portal04                                               <-- you are logged into the portal cluster
 +abc1de@portal04 ~ $ ssh gpusrv01                       <-- you can now ssh to gpusrv01
 +abc1de@gpusrv01's password:
 +abc1de@gpusrv01 ~ $                                    <-- you are logged into gpusrv01
 +</code>
 +
 +=== Jumphost Option ===
 +
 +The //ssh// command has an option ''%%-J%%'' to specify a server to use as a "jumphost" that lets you access other servers directly with one command.  This combines two steps (for example, //ssh// into //portal.cs.virginia.edu// and then //ssh// to //gpusrv01//).
 +
 +Here is how we use this option to "jump" from //portal// to another CS server.  Let's repeat the example of logging in to //gpusrv01//.
 +
 +<code>
 +[abc1de@outside-uva ~]$ ssh abc1de@gpusrv01 -J abc1de@portal.cs.virginia.edu
 +abc1de@portal04.cs.virginia.edu's password:                  <-- first asked to authenticate to portal
 +abc1de@gpusrv01's password:                                  <-- immediately able to log into gpusrv01
 +abc1de@gpusrv01 ~ $                                          <-- you are logged into gpusrv01
 +</code>
 +
 +=== Host Names depend upon your network connection ===
 +
 +If you are on the Computer Science network just use the hostname of a server (ex. //portal//). If you are outside of the CS network (on wireless for example), use the hostname's fully qualified name (ex. //portal.cs.virginia.edu//). 
 +
 +=== Available Servers ===
 +
 +For a listing of generally available servers in CS, see [[compute_resources|Computing Resources]]