Chris Burgess

Melbourne, Australia

Red Hat Enterprise Linux 5 and Security-Enhanced Linux

SAGE-AU Victorian Chapter Meeting – Tuesday 10th July 2007

DATE: Tuesday 10th July 2007

TIME: 7:00 PM till 8:00 PM

VENUE: Ground Floor Tutorial Room, Baillieu Library The University of Melbourne – Parkville

AGENDA: Red Hat Enterprise Linux 5 and Security-Enhanced Linux

Luie Matthee from Red Hat will be presenting on Red Hat Enterprise Linux 5 and Security-Enhanced Linux (SELinux). Red Hat Enterprise Linux 5, released in March 2007, contains more than 1200 components with development spanning over a two year period, so there are a huge number of new features covering a broad range of functionality. This release of Red Hat Enterprise Linux has many features and enhancements related to SELinux which will be covered by Luie.

PRESENTER: Luie Matthee, Red Hat

WEB: See http://www.sage-au.org.au for more info.

WHO: SAGE-AU Members, prospective members, and other people involved with system administration.

MENU: A carefully selected range of traditional SysAdmin fare (ie. pizza) is provided free of charge to attendees. Members with special dietary requirements should contact the executive prior to the meeting.

DIRECTIONS: To get to the venue by public transport, catch a University, No
8 (Moreland) or No 1 (East Coburg) tram up Swanston St or the number 19 tram (North Coburg) up Elizabeth St. The tutorial room is at the south end of the ground floor of the Baillieu Library.

Troubleshooting SSH Connections

A friend of mine asked me to troubleshoot a problem he was having with authenticating to an SSH server. Like most problems, the answer could be found buried in logs, or in this case, debug output. For those who use SSH and don’t know about -v, it time you learnt about this wonderful switch. In the UNIX world, -v usually denotes verbostiy, that is, the level of detail that the program will display. Most programs you run from the command line support -v, and often -vv and -vvv. The more v’s, the higher the level of verbosity.

Start up an SSH session from the command line:

ssh username@host -v
ssh username@host -vv
ssh username@host -vvv

If you aren’t using -v while troubleshooting, try it out, it will make your life a whole lot easier.

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