====== Frequently Asked Questions ======
If you can't find what you're looking for on this page, be sure to check the CTBP [[http://ctbp.ucsd.edu/computing/wiki/how-to|HOW-TOs]] before e-mailing ctbp-help. Additional (a bit obsolete) information is located [[http://ctbp.ucsd.edu/computing/howto/index.php|here]].
===== How do I get an account on CTBP servers and clusters? =====
Please see this [[http://ctbp.ucsd.edu/computing/accounts.php|page]]. The accounts are distributed by kerberos, so an account on one machine will work on all machines.
===== How do I remotely login to these machines? =====
The only way to remotely login to the CTBP servers and clusters is to use secure shell (ssh).
Please note that ssh logins to CTBP clusters (ctbp1 and ctbp1m) are allowed only from CTBP network. If you are connecting from outside you have to log in to our gateway, ctbp0.ucsd.edu, first and then to either ctbp1 or ctbp1m.
===== Does e-mail work on any ofthese machines? =====
ctbp.ucsd.edu is the CTBP mail server - you can check your mail there either by login to the ctbp0.ucsd.edu (using ssh) or using web interface.
===== How can I start using CTBP mail/webmail services? =====
Login to the mailserver (ssh username@ctbp0.ucsd.edu) and execute this command: ''rm .forward'' (or ''rm /net/home/$USER/.forward''). From now on all email addressed to username@ctbp.ucsd.edu will stay on ctbp0.ucsd.edu. To read your email either login to the mail server (ctbp0.ucsd.edu) or use webmail access and use your login name and password to log in. If you want to have your ctbp email redirected to other mailserver - just edit your .forward file.
===== How do I configure my mail client to use CTBP email? =====
If you would like to use IMAP access on ctbp.ucsd.edu, simply set ctbp.ucsd.edu as your incoming IMAP server. We do not have SMTP relaying enabled on that machine so you should use the campus wide smtp.ucsd.edu.
===== How do I change my password? =====
Use the ''passwd username'' command on ''ctbp0.ucsd.edu''. After a brief delay, the password change should propagate to all of the servers. If it's been a month since your password expired and you have not changed it you will no longer be able to logon and need to reset the password in person - please contact ctbp-help.
===== What software is available? =====
See the [[http://ctbp.ucsd.edu/computing/wiki/software|available software page]] for a list of the software that is currently installed and some links to the software home pages.
===== What should I do to get a particular piece of software installed? =====
If it's free software, just e-mail ctbp-help @ ctbp.ucsd.edu and let us know what you need and we'll try to get it installed.
===== Where can I run my long-term, CPU-intensive jobs? =====
The only platform for non-interactive computational work are the linux cluster (ctbp1.ucsd.edu and ctbp1m.ucsd.edu), please see the CTBP Cluster [[http://ctbp.ucsd.edu/computing/wiki/introduction_to_ctbp_cluster_computing | How-To]] for more information about this resource.
===== What is my disk quota on the clusters? =====
Every user has two directories on the clusters: /home/$USER as home directory and /gpfs/$USER for actually running jobs from.
The current quotas are:
^ Directory ^ Quota ^
| /home | 20 GB |
| /gpfs | 100 GB |
The nightly updated list of quotas per user can be found [[http://ctbp1.ucsd.edu/quotas.html| here]].
If your project temporarily requires bigger disk space allocation please email ctbp-help with a request to enlarge your quota,
===== What are SGE scheduling policies for the CTBP cluster? =====
Please see [[http://ctbp.ucsd.edu/computing/howto/sge.php| SGE How-To]] for more information.
===== Copy files from a remote computer (outside of CTBP network) to ctbp1.ucsd.edu =====
Since no connection from outside of UCSD network are allowed on the cluster you need to set up a tunneling connection from your remote host to ''ctbp0.ucsd.edu'' and from there to ''ctbp1.ucsd.edu'':
1. Open a terminal window on your remote computer and type:
ssh -f -N -L 2020:ctbp1.ucsd.edu:22 user@ctbp0.ucsd.edu
this will log you in to ''ctbp0.ucsd.edu'' and open an ssh tunnel to ''ctbp1.ucsd.edu''
2. Then actually copy the file:
scp -P 2020 file_to_copy.tar localhost:
this will prompt you for your ''ctbp1.ucsd.edu'' password and will proceed with
copying your file to ''ctbp1.ucsd.edu''
===== SSH tunnel setup =====
==== Setup SSH tunnel to ctbp1 from outside of CTBP network ====
ssh -f -N -L 2022:ctbp1:22 username@ctbp0.ucsd.edu
This sets up secure tunnel to ''ctbp1'' through ''ctbp0''. Then you can login directly to ''ctbp1'':
ssh -p 2022 localhost
==== Setup SSH tunnel from a Mac to CTBP network ====
Essentially, the same method is used as above. If you get the following error:
channel 2: open failed: administratively prohibited: open failed
ssh_exchange_identification: Connection closed by remote host
try using IP addresses instead of host names.
Open Terminal.app and use:
ssh -f -N -L 2022:132.239.16.158:22 username@132.239.16.142
In this example, 132.239.16.158 is ctbp1 and 132.239.16.142 is ctbp0.
This sets up secure tunnel to ''ctbp1'' through ''ctbp0''. Then you can login directly to ''ctbp1''...
In Terminal.app:
ssh -p 2022 localhost
You can also use various sftp/scp GUI apps such as Fugu and Cyberduck and connect by using ''localhost'' as the host name
and ''2022'' as the port.
==== Setup SSH tunnel from a Windows machine to CTBP network ====
This [[http://winscp.net/eng/docs/faq_tunnel|page]] show how to setup a tunnel using putty.