Right On Time, Somewhere Post: 302589822

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The Lounge War Stories Right On Time, Somewhere Post 302589822 by Corona688 on Thursday 12th of January 2012 05:58:16 PM

01-12-2012

Registered User

Right On Time, Somewhere

Things like this are teaching me a greater appreciation for network time...

The huge gap between the speed of a satellite connection and its tiny bandwidth allowance means either being completely draconian or having to chide people to not abuse it all the time. We're somewhere inbetween, if a customer downloads too much they'll be slowed down temporarily, but not shut off; if the situation continues, we may phonecall and investigate.

We had a situation where a small community had massively overused their satellite connection pretty much collectively, going over not only our limits but our provider's limits, causing the entire satellite connection to be throttled. We needed to shut the connection down for a few hours before the satellite modem would let go.

We planned it, set a time, and warned our customers. How it worked was very simple -- two entries in root's crontab. At noon that day, the first one would run 'ifconfig eth1 down', taking the community offline but leaving me in communication with the server. At 5pm that day, it would run '/sbin/reboot'.

The server clock had drifted far more than I'd anticipated in the months since its last boot and clock-set, and the shutdown happened one hour early.

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LEARN ABOUT DEBIAN

update-gap-workspace

UPDATE-GAP-WORKSPACE(1) 					   User Commands					   UPDATE-GAP-WORKSPACE(1)

NAME

       update-gap-workspace - manage a GAP workspace.

SYNOPSIS

       update-gap-workspace

       update-gap-workspace update

	      Create or update the GAP workspace.

       update-gap-workspace delete

	      Delete the GAP workspace.

DESCRIPTION

       At  start  up,  GAP  load  all  libraries and packages available on the system.	This take several seconds. To save time, GAP can store the
       result of this initialisation in a `workspace'.	update-gap-workspace help to manage such workspaces.  update-gap-workspace can be  run	as
       root  to  manage  the  system-wide  workspace.	update-gap-workspace  can be run as a normal user. In this case the workspace is stored in
       $HOME/gap/workspace.gz.

       Note that you need to rebuild the workspace each time GAP packages are added, removed or updated. To automate that task, if the system-wide
       workspace exists, it is automatically updated whenever a GAP-related Debian package is installed or upgraded.

       The gap script will automatically load such workspace at start up.

FILES

       /var/lib/gap/workspace.gz:
	      The system-wide GAP workspace.
       $HOME/gap/workspace.gz:
	      The user-specific GAP workspace.

SEE ALSO

       gap(1), The `SaveWorkspace' function in the GAP manual.

AUTHOR

       Bill Allombert <ballombe@debian.org>

NOTES

       We  are	considering  enabling the system-wide workspace per default, though this feature could be too confusing for old-time GAP users. If
       you have opinions about it, please mail <gap@packages.debian.org>.

Debian								     July 2003						   UPDATE-GAP-WORKSPACE(1)