'Uncategorized' Category

  • Backups and sparse files

    July 11, 2014

    The subtly of backups is often overlooked. What is meant by a backup depends on the purpose, and no backup scheme can satisfy all requirements. Some backups serve the purpose of system administrators. The goal of these backups is to provide a mirror-image restore of the file system as it was at certain planned checkpoints […]

  • Hill backup schedule

    August 17, 2013

    The Hill backup system was described in a prior posting. It’s main purpose is to provide roll-back to a known system state in case of complete loss in Ungar. For this reason, it uses dump to provide an block-accurate disk image, including hard links and sparse files and does not modify touch times during backup. […]

  • Beauregard renovations

    August 16, 2013

    Beauregard has been updated to Ubuntu 12.04-amd64 LTS , from Debian. Beauregard now provides Mysql, NFS and backup services to the blades. For backup, the blades are sandboxed, we generally do not snapshot the system; user data should be either on the NFS mounted partition, in the mysql database, or on our subversion server. The […]

  • Private local numbering

    June 22, 2013

    The internal IP addresses of the computer science machines are from the 172.16.0.0/12 address block which is then subnetted by security level to an overall 172.16.0.0/16 address. Currently there are four security levels – public, sandbox, lab and servers, but this summer we will collapse public and sandbox into a single level. prefix subnet IP […]

  • Online backups

    August 19, 2012

    Over the past year the department has improved backups with respect to: Accessibility, but having on-line backups to large capacity backup servers; Diversity, locating one of two backup remotely, to reduce site-risk; Security, with end-to-end encryption so that the remote server does not have the data nor keys; Correctness, by making sure the data is […]

  • Moving WordPress across servers

    August 19, 2012

    To move a wordpress to a new server requires that three objects get moved: The wordpress application; The database of user content; and the HTTP configuration. On a fresh Red Hat derived Linux, the required yum installs are: mysql-server, mysql, httpd, php, php-mysql. WordPress is installed via tar, as a php application there is no […]

  • Welcome Bragg

    August 19, 2012

    Bragg is now up and running, thanks to Irina. Bragg is a Dell R510 running a single Intel E5620 2.4 Ghz, 24G 1333MHz dual ranked RDIMM’s; a PERC H700 Raid, and 600 GB/2 TB mirrored SAS. It will be taking on the responsibilities of Davis. We have moved to CentOS, because UM is not longer […]

  • Welcome Hill

    June 11, 2012

    Welcome our newest server, hill.physics.miami.edu (CNAME hill.cs.miami.edu). The R510 Dell is located in the physics department server room, and runs Ubuntu. It’s purpose is to hold backups of other cs machines, offsite in case of a room-wide emergency. Running Ubuntu 10.04.4 LTS we are good to go until April 2015. (We missed 12.04 LTS by […]

  • Migration to the cloud

    June 11, 2012

    In preparation to update meade, the services svn.cs.miami.edu, blog.cs.miami.edu, and aigames.cs.miami.edu have been moved to instances on AWS. Only web.cs.miami.edu remains on meade. web.cs.miami.edu/aigames will have a permanent redirect to aigames.cs.miami.edu.

  • /home homepages

    August 16, 2011

    www.cs.miami.edu/~[username] is now supplemented with www.cs.miami.edu/home/[username]. This change allows [username]’s homepages to be addressed by both style URL’s. Your account was created with a symbolic self-link “public_html->.” in you public_html directory. This self-link means that the new URL scheme will work along side the old URL scheme without any change to your homepages. If one […]

 
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