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The Lounge War Stories Prize of being an Admin - Part 2 Post 302806121 by bakunin on Sunday 12th of May 2013 02:24:09 PM
Old 05-12-2013
First observation: sh!t happens! That is a proven, reliable fact and an environment which can't cope with that is designed wrongly from the start. If you need a service to be not disrupted you shouldn't allow people to develop on it, because development will create the one or other hiccup to happen over time. Further, you need to take precautions against failure of every single part of the system if it should survive. Suppose instead of your error some hardware would have crashed, the network disrupted, whatever. This is what HA-solutions are for, for instance.

No SysAdmin in his right mind will let a manager determined to "save" on hardware off this hook: do you want to bet the projects future on me never doing an accidental typo? (As it is i have actually said exactly this in a design conference - and got my testing system.) And, by the way: when they decide about new office furniture for their offices any intention to save is usually abandoned immediately, so wtf?

Second aspect: whenever you do something it is your utmost responsibility to test what you have done. Immediately! So how can you create such a loop and not notice it? How can you implement this change even twice? This is not a question of introducing an error - that happens to all of us. It is a matter if noticing you have done something wrong and this has to do with the style of work: if i delete a file, i do an immediate "ls" to verify it (and it alone) is gone, if i do a "cd" i do a "pwd" to verify i am in the right directory, etc., etc.. This slows me down by perhaps 5%, but when i think i have something done i usually have it done - without any error. The 5% are easily recovered not having to do the error correction and/or recovery others eventually have to do.

So, i hope for your best, but you should really change your work ethics and learn from this accident. My 2 cents.

bakunin
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uruk-save(8)						      SYSTEM ADMINISTRATION						      uruk-save(8)

  NAME
      uruk-save - save uruk rc configuration in iptables-save-style format

  SYNOPSIS
      uruk-save [-6 (save ip6tables rules)]

  OPTIONS
      -6 (save ip6tables rules)
	Don't save iptables rules but save ip6tables rules, for IPv6 filtering.

  DESCRIPTION
      uruk-save  saves	the  IPv4 rules in /etc/uruk/rc in iptables-save(5)-style format, without invoking iptables(8). If the -6 option is given,
      the IPv6 rules (if any) in /etc/uruk/rc are saved, in ip6tables-save(5)-style format. It	prints	output	to  stdout;  suggested	invocation
      therefore is

       # uruk-save > /var/lib/uruk/iptables/active

      or

       # uruk-save -6 > /var/lib/uruk/ip6tables/active

      .  This script is useful if you don't like the default behaviour of the uruk init script, and would like it to load the current uruk rc file
      instead of the current active file. Please note: generally you don't need to invoke this script manually: the init script which  comes  with
      uruk is suitable for most cases, it invokes uruk-save if needed.

  WARNING
      Just as uruk, in order to keep the uruk-save script small and simple, the script does very little error handling. It does not check the con-
      tents of the rc file in any way before executing it. When your rc file contains bogus stuff, uruk-save will very likely behave in unexpected
      ways. Caveat emptor.

      Things will likely break if you do fancy stuff in an rc hook file. For instance, uruk-save saves the filter table only. If you define mangle
      or nat tables, things will break.

      If your rc file is in verbose mode (i.e. it features set -x) or in no-act mode (i.e. it features iptables='echo iptables'), uruk-save fails.

  SEE ALSO
      uruk(8), uruk-rc(5) .

  COPYRIGHT
      Copyright (C) 2005 Joost van Baal <joostvb-uruk@mdcc.cx>

      This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License  as  published	by
      the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

      This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABIL-
      ITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

      You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

  AUTHOR
      Joost van Baal <joostvb-uruk@mdcc.cx>

  uruk-save 20120530						      30 mai 2012							uruk-save(8)
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