Differences

This shows you the differences between two versions of the page.

--- hardware:cluster:openlab [2023/10/24 09:27]
wdcohen [Connecting to Openlab]
+++ hardware:cluster:openlab [2024/04/19 10:34] (current)
hans [Splash Screen]
@@ Line 24: / Line 24: @@
 Also see [[courses:openlab_faq|]]
-=== Resuming Suspended Processes ===
-If you find your process has been suspended, you may resume it by using the kill command ton send the CONT signal.
-<code>
-kill -CONT <pid>
-</code>
-You may list your processes using the command `ps ux`.  Suspended processes will have a "T" in the 8th column
-<code>
-USER         PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
-hans     2458438  0.0  0.0   6476  2244 pts/18   S+   14:08   0:00 grep --color=auto --exclude-dir=.bzr --exclude-dir=CVS --exclude-dir=.git --exclude-dir=.hg --exclude-dir=.svn --exclude-dir=.idea --exclude-dir=.tox T
-hank     3554779  0.0  0.0  20480  3164 ?        Ts    2022  24:43 SCREEN -xxR
-</code>
-In this case you would resume the SCREEN process, pid 3554779 by running:
-<code>
-kill -CONT 3554779
-</code>
 ===== Home Directory =====
@@ Line 60: / Line 43: @@
 **NOTE**:  If you are running a long running process, please take note of the hostname you are running on.   The name "openlab.ics.uci.edu" is a load balancer and may not point you to the same host twice.  You can determine the hostname by running the command `hostname` from the shell cli.   When you come back to check on  your process, you will ssh into this name instead of openlab.ics.uci.edu.
+==== MOD/Splash Screen ====
-=== Off Campus Access ===
+When you login to the Openlab Linux cluster you will receive a lot of information that includes sections about fair use, system load and message from individual software [[commands:modules|ICS softward modules]] you add to your environment.  This information may also include a message similar to the following:
+<code>
+Expanded Security Maintenance for Applications is not enabled.
+updates can be applied immediately.
+of these updates are standard security updates.
+To see these additional updates run: apt list --upgradable
+additional security updates can be applied with ESM Apps.
+Learn more about enabling ESM Apps service at https://ubuntu.com/esm
+</code>
+You may safely ignore this message. This message is automatically managed by [[https://ubuntu.com/landscape/features|Ubuntu Landscape]] and regards the host that you have logged into, not your local system.
+This message indicates that there are patches available or that patches that have been applied require a system restart in order to fully install.  Our systems administrators will take care of that, typically between quarters when systems are not heavily used.
+==== Off Campus Access ====
 **ADVISORY**:  Off campus access requires [[accounts:ssh_keys|ssh keys]].   Users connecting from off campus must use keys.   Users connecting from off campus cannot use passwords to login to the openlab cluster.
@@ Line 109: / Line 109: @@
 ==== Availability ====
-The openlab cluster is available on and off campus via SSH and [[services:slurme|SGE]].
+The openlab cluster is available on and off campus via SSH and [[services:slurm|SLURM]].
 There are limitations regarding authentication and how users can connect to the openlab cluster.   Please refer to the following matrix for specific information:
-^Location^[[accounts:ssh_keys|SSH with Keys]]^SSH with Password^[[group:support:software:sge|SGE QRSH]]^
+^Location^[[accounts:ssh_keys|SSH with Keys]]^SSH with Password^[[services:slurm|SLURM]]^
 ^On campus|  Yes  |  Yes  |  Yes  |
 ^Off Campus<sup>*</sup>|  Yes  |  No  |  No  |
@@ Line 155: / Line 155: @@
 ===== Details ======
-  * Operating System:  CentOS 7 (Redhat Enterprise Linux 7 Equivalent) or Ubuntu 20.04.
+  * Operating System: Ubuntu 22.04.
-  * Provisioning:  Puppet 3.x
+  * Provisioning:  Puppet 6.x
   * Primary Investigator:  Computing Support
   * Contact Email:  helpdesk@ics.uci.edu
@@ Line 222: / Line 222: @@
 </code>
-=====Troubleshooting======
+===== Long Running Processes =====
+==== Resuming Suspended Processes ====
+If you find your process has been suspended, you may resume it by using the kill command ton send the CONT signal.
+<code>
+kill -CONT <pid>
+</code>
+You may list your processes using the command `ps ux`.  Suspended processes will have a "T" in the 8th column
+<code>
+USER         PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
+hans     2458438  0.0  0.0   6476  2244 pts/18   S+   14:08   0:00 grep --color=auto --exclude-dir=.bzr --exclude-dir=CVS --exclude-dir=.git --exclude-dir=.hg --exclude-dir=.svn --exclude-dir=.idea --exclude-dir=.tox T
+hank     3554779  0.0  0.0  20480  3164 ?        Ts    2022  24:43 SCREEN -xxR
+</code>
+In this case you would resume the SCREEN process, pid 3554779 by running:
+<code>
+kill -CONT 3554779
+</code>
-Also see [[courses:openlab_faq|]]
-=== Exceptions ===
+==== Exceptions ====
-The following long running processes will not be suspended on the Openlab Linux Cluster:
+The following long running processes will not be automatically suspended on the Openlab Linux Cluster:
   * bash
@@ Line 262: / Line 280: @@
   * dbus-send
+=====Troubleshooting======
+Also see [[courses:openlab_faq|]]
+==== RSA host key for <hostname> has changed ====
+If you receive an error "Hot key verification failed" when logging in, you may, if you are confident you are logging into the correct host, clear the offending key by issuing the following command, on most platforms, to clear the old host key and resolve the error:
+  ssh-keygen -R <hostname>
+If this does not work on your platform, please send a message to helpdesk@ics.uci.edu along with the output from the command so we can extend this information.
+==== RC Files ====
-===RC Files===
+ICS users may occasionally damage their dot files, which results in unusual-looking SSH prompts and/or being unable to use the “module” command.
-ICS users will occasionally damage their dot files, which results in unusual-looking SSH prompts and/or being unable to use the “module” command.  If this is the case, click here for directions to [[https://swiki.ics.uci.edu/doku.php/accounts:restore_unix_dot_files|]]  If the above fails, contact [[https://swiki.ics.uci.edu/doku.php/start?s[]=helpdesk#contacting_ics_computing_support_helpdesk|helpdesk]].
+If this is the case, click here for directions to [[https://swiki.ics.uci.edu/doku.php/accounts:restore_unix_dot_files|]]  If the above fails, contact [[https://swiki.ics.uci.edu/doku.php/start?s[]=helpdesk#contacting_ics_computing_support_helpdesk|helpdesk]].