ServerChangeControl < Org

Org Web>InternetServer>ServerCoordination>ServerChangeControl (2023-12-13, BenScott) (raw view)

We use a system of scripts called =admchange= to coordinate changes.  The idea is to provide a mechanism to keep various admins (in different locations, and with different types of reachability) from bumping into each other.

---++ Documentation

---+++ Name

   * =admchange= - control changes by system administrators
   * =startchange= - begin a large change, with locking
   * =endchange= - end a large change, releasing lock
   * =logchange= - log a note about a smaller change

---+++ Synopsis

=*change [-b] [-e] [-m message]=

---+++ Purpose

Helps keep track who is making changes to the system at any given time, and preven collisions of same.  Maintains a changelog to keep a record of these changes over time.

---+++ Usage

Operation being performed is determined by the name the script is called as.  Intent is for links to be made to master =admchange= script.  Do not call as =admchange= directly.

In all three modes, the user provides a message to describe the change.  Defaults to prompting using =readline= for input, RCS-style.  Will use your =$EDITOR= or =/bin/vi= instead if you call this script with =-e= option. Can also specify a message as an argument using =-m= option (useful for short one-liners, e.g., =logchange -b -m 'restarted apache'=).

The message is recorded in the change log and broadcast using =wall=.  The =-b= option suppresses the wall broadcast.

Call as =startchange= to begin a large change.  A "large change" is one which will take some time to finish, during which time other admins should not make changes.  This establishes a lock to prevent another =startchange= from being started before =endchange= is called.  The message entered is also added to =/etc/motd= to alert any new logins.

Call as =endchange= to signal the end of a change begun with =startchange=, and release the lock.  Restores =/etc/motd= as well.

Call as =logchange= to log a minor change which doesn't need to be guarded by locking.  This does not touch =/etc/motd= at all.  Can be used while =startchange= is in effect  (useful for checkpoint logging).

---++ Discussion

Use the =startchange= and =endchange= scripts in =/usr/local/adm=. I was going to include Mike Ledoux's instructional message in here, but I can't find it in the archives! -- Main.BruceDawson - 23 Feb 2006

That's because I never wrote one.  I described a method that I thought would work to control access, then quickly wrote the scripts to do it and sent them up to the server.  Usage is simple, really, just run =startchange= as yourself before making any changes, then run =endchange= when you are done.  The scripts will prompt you for a log message (reading from stdin, redirection works fine; or use the =-e= option to fire up a real editor) then do all the magic for you.  -- Main.MikeLedoux - 27 Feb 2006

The scripts have been combined into one multi-call script, and some functionlity added.  The script and links now live =/usr/local/adm/bin/= with data files in =/usr/local/adm/changes/=.  There is a =logchange= script one can run to record notes on a change that didn't need the start/end guarding.  See the source for details.  -- Main.BenScott - 03 Apr 20

The script keeps getting tweaked to add (creeping) features.  I attached the latest version of the =admchange= script to this page, in case others might find it useful.  The source is fairly well-commented, with usage instructions at the top.  Share and enjoy! -- Main.BenScott - 21 May 2006

Attachments

Topic attachments
I	Attachment	History	Action	Size	Date	Who	Comment
ext	admchange	r1	manage	8.3 K	2006-05-20 - 21:18	BenScott	administrator change control script

Topic revision: r6 - 2023-12-13 - BenScott

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