Service Desk Knowledgebase: Servers

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This is the Severs content page of the CL Wiki Service Desk Knowledgebase. Its purpose is to provide information to the Service Desk team on how to handle problems and requests about this CL service. If you are involved with the provision of this CL service please feel free to add to the knowledge about that it.

If CL staff need to tell the Service Desk team about problems with this service please email
sys-admin-aside@cl.cam.ac.uk.

Return to the Service Desk Knowledgebase SERVICE PORTFOLIO

Key Service Description & URLs

CL Customer Documentation

Further CL Sys-Admin Resources

Underpinning Services

  • Departmental Servers and Group Servers are all physically located in one of the machine rooms: GN09, FN11 or SE18.

Customer-base for this Service

  • All staff and students of the Computer Laboratory

Costs

  • Free to all current staff and students of the Computer Laboratory

SLA

  • N/A

Service Desk Call Handling Procedure

Escalation points and key contacts to be defined...

  • RT tickets can be escalated by changing the Queue to backoffice with the Owner set to Nobody and the Status as new. Tell the requestor:
    I am passing this request over to the experts who, I'm sure, will be in contact shortly.

'Omnipotent' Machines Laira & Totan and Privileges

Piete Brooks (6/3/15)

On (nearly) all machines, access on the filer fileserver is based on the kerberos ticket used to access the filer. root has a low priv kerberos key. To raise your privs, you have to login to an 'omnipotent' machine (currently laira & totan) which uses NFS sec=sys rather than sec=keb5 and has root_no_squash.

Creating a HotCRP Conference Web Server

1. Use PuTTY and go to the CL's slogin-serv.cl.cam.ac.uk

2. Make the PuTTY window longer.

3. Type kinit & press [Enter]

4. Enter your CL Password for CRSid@AD.CL.CAM.AC.UK & press [Enter]

5. Type ssh -K laira & press [Enter] to go to the privileged machine laira

6. At the laira:~$ prompt use sudo ssh -K svr-hotcrp and [Enter]

7. Then cd /opt/hotcrp and [Enter]

8. sh -x README.cl shortName and [Enter] (shortName is the conferences name which must have no spaces)

9. You will get output like the following which tells you what to do next:- 

 SenSys_2015
 

 edit SenSys_2015/conf/options.php (was Code/options.inc) and check that it looks plausible.
 'paperSite' should be set to http://svr-hotcrp.cl.cam.ac.uk/hotcrp/SenSys_2015
 'downloadPrefix' should be set to 'SenSys_2015-" (note the trailing hyphen).
 set shortName', 'longName', 'contactName', 'contactEmail' and 'emailFrom' and
 'emailSubmissions' from the user supplied info.
  

 + echo
  

 + echo Add SenSys_2015 to /etc/apache2/httpd.conf, then 'cl-asuser service apache2 graceful'
 Add SenSys_2015 to /etc/apache2/httpd.conf, then 'cl-asuser service apache2 graceful'


10. Use vi SenSys_2015/conf/options.php and [Enter] to set the options mentioned similar to the following example:-
[Note: the acm in sensys.acm.org is not a typo.] 

 $Opt["dbName"] = "SenSys_2015";
 $Opt["dbUser"] = "SenSys_2015";
 $Opt["dbPassword"] = "SenSys_2015_cm542";
 $Opt["shortName"] = "SenSys2015";
 $Opt["longName"] = "13th ACM Conference on Embedded Networked Sensor Systems";
 $Opt["conferenceSite"] = "http://sensys.acm.org/2015/";
 $Opt["paperSite"] = "http://svr-hotcrp.cl.cam.ac.uk/hotcrp/SenSys_2015";
 $Opt["downloadPrefix"] = "SenSys_2015-";
 $Opt["contactName"] = "Cecilia Mascolo";
 $Opt["contactEmail"] = "cm542@cam.ac.uk";
 $Opt["sendEmail"] = true;
 $Opt["emailFrom"] = "cm542@cam.ac.uk";
 $Opt["emailSender"] = null;
 $Opt["emailSubmissions"] = "cm542@cam.ac.uk";

11. Using vi /etc/apache2/httpd.conf copy a previous conference setup

12. Just above Next confernce here... at the end of the file paste in the previous conference details and edit them for the current conference

13. :wq and [Enter] to write & quit vi

14. Restart with cl-asuser service apache2 graceful and [Enter]

15. Close down the sessions and PuTTY using exit and [Enter]

Contacts

Primary

Availability

  • Monday:
  • Tuesday:
  • Wednesday:
  • Thursday:
  • Friday:
  • Saturday: Closed
  • Sunday: Closed

Hints, Tips & Known Issues

Slogin-serv & Filer Home directory

Piete Brooks (12/3/15)

If connecting to slogin-serv.cl.cam.ac.uk you will be allocated a "std lab" machine (based on current usage) and see either of the prompts:
svr-ssh-1:~$ (the virtual server)
or
sandy:~$ (the physical server)
Each of these machines require their own separate & time-limited krbtgt key for access to your home directory (/home/CRSid) on the departmental "filer" fileserver using the Kerberos authenication protocol. If the key has timed-out you can request a fresh krbtgt key manually using the “kinit” command on each of the servers.

Categorising Keywords

  • A categorization or service type
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