Image cleanup script

UPDATE 1/23/09: some commenters asked about cleanup of the LKDC (new in Leopard) – I’ve added that to the script.

At the Macworld Expo 2009 Power Tools System Imaging and Deployment session today, I was asked to share a “checklist” of cleanup steps I use when building images the “classic” way. (The InstaDMG methodology of image building makes cleanup steps unneeded.)

Here’s a cleaned-up version of the script I use, with site-specific stuff removed for the most part.

If you use this, you’ll need to modify the paths to any local user home directories for any local users you have on your image. There are generic examples for a local admin user named “admin” and the root user (which if you never login as root, you shouldn’t have to clean up!)

#!/bin/sh
#this script does some cleanup in preperation for building an image
#best to run this from single user mode, or at least right before you shutdown
#run this as root, or with sudo rights

#set machine names back to generic
/usr/sbin/scutil --set ComputerName "OSX_Standard_Image"
/usr/sbin/scutil --set LocalHostName "osximg"

#delete swapfiles
rm /private/var/vm/swapfile*

#delete volume info DB
rm /private/var/db/volinfo.database

#cleanup local admin's home dir
rm -rf /Users/admin/Desktop/*
rm -rf /Users/admin/Documents/*
rm -rf /Users/admin/Library/Caches/*
rm -rf /Users/admin/Library/Recent\ Servers/*
rm -rf /Users/admin/Library/Logs/*
rm -rf /Users/admin/Library/Keychains/*
rm -rf /Users/admin/Library/Preferences/ByHost/*
rm -f /Users/admin/Library/Preferences/com.apple.recentitems.plist
rm -rf /Users/admin/Movies/*
rm -rf /Users/admin/Music/*
rm -rf /Users/admin/Pictures/*
rm -rf /Users/admin/Public/Drop\ Box/* 

#cleanup root's home dir
rm -rf /private/var/root/Desktop/*
rm -rf /private/var/root/Documents/*
rm -rf /private/var/root/Downloads/*
rm -rf /private/var/root/Library/Caches/*
rm -rf /private/var/root/Library/Recent\ Servers/*
rm -rf /private/var/root/Library/Logs/*
rm -rf /private/var/root/Library/Keychains/*
rm -rf /private/var/root/Library/Preferences/ByHost/*
rm -f /private/var/root/Library/Preferences/com.apple.recentitems.plist
rm -rf /private/var/root/Public/Drop\ Box/*

#clean up global caches and temp data
rm -rf /Library/Caches/*
rm -rf /System/Library/Caches/*
rm -rf /Users/Shared/*
rm -f /private/etc/ssh_host*

#network interfaces - this is regenerated on reboot and can differ on different hardware
rm /Library/Preferences/SystemConfiguration/NetworkInterfaces.plist

#Leopard - cleanup local KDC, see http://support.apple.com/kb/TS1245
/usr/sbin/systemkeychain -k /Library/Keychains/System.keychain -C -f
rm -rf /var/db/krb5kdc
/usr/bin/defaults delete /System/Library/LaunchDaemons/com.apple.configureLocalKDC Disabled

#log cleanup.  We touch the log file after removing it since syslog
#won't create missing logs.  
rm /private/var/log/alf.log
touch /private/var/log/alf.log
rm /private/var/log/cups/access_log   
touch /private/var/log/cups/access_log
rm /private/var/log/cups/error_log   
touch /private/var/log/cups/error_log
rm /private/var/log/cups/page_log   
touch /private/var/log/cups/page_log
rm /private/var/log/daily.out
rm /private/var/log/ftp.log*
touch /private/var/log/ftp.log
rm -rf /private/var/log/httpd/*
rm /private/var/log/lastlog
rm /private/var/log/lookupd.log*
rm /private/var/log/lpr.log*
rm /private/var/log/mail.log*
touch /private/var/log/lpr.log
rm /private/var/log/mail.log*
touch /private/var/log/mail.log
rm /private/var/log/monthly.out
rm /private/var/log/run_radmind.log
rm -rf /private/var/log/samba/*
rm /private/var/log/secure.log
touch /private/var/log/secure.log
rm /private/var/log/system.log*
touch /private/var/log/system.log
rm /private/var/log/weekly.out
rm /private/var/log/windowserver.log
touch /private/var/log/windowserver.log
rm /private/var/log/windowserver_last.log
rm /private/var/log/wtmp.*

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19 Comments on “Image cleanup script”

  1. Gil Burns Says:

    I’m kind curious as to the reason you chose to set the ComputerName and LocalHostName to different values?

  2. GregN Says:

    Because I can! Seriously, there was a reason in the past (and the values in the script I posted are not the ones in the script I actually use), but I cannot really remember why…

  3. DB Says:

    Script is being cut off a little…would be nice to be able to copy/paste it if possible.

  4. GregN Says:

    Copy and paste works for me (using Safari as the web browser) — all text is preserved and the long lines come back…

    -Greg

  5. RobertB Says:

    Hi Greg

    Noticed that you are not doing anything with the LKDC, in this scipt, are you cleaning this up elsewhere in your imaging process ? Interested in your throughts and comments on this. Cool script by the way…

    Thanks as always for contibuting to the Apple community !

  6. GregN Says:

    I have to admit that I’m not doing anything with the LKDC stuff, and I probably should be…

  7. filipp Says:

    The LKDC caught my eye as well (only because I’ve experienced the pain of not resetting it!) Now I always do:
    rm -rf /var/db/krb5kdc
    /usr/libexec/configureLocalKDC

    thanks!

  8. david koff Says:

    here’s the script we use here as a contribution to greg’s awesome script. we like removing a few other items before imaging as well.

    FYI: we have users accounts called “workstation” and “fieldtech” so you’ll see those calls in our script. obviously, you’ll want to add your own user account names if you have them.

    #!/bin/sh

    # the j. paul getty scrubbing tool, ©2007, David Koff
    # used to finalize a drive for use as an images for cloning.
    # may not be used without including these three lines of code.

    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo This script will prepare your Macintosh for being imaged.
    echo Certain system files will be deleted. Additionally, the
    echo ‘Workstation’ user account will be copied into the ‘english.lproj’
    echo folder for use as a template for creating new user accounts.
    echo “”
    echo “”
    echo “”
    echo “The script will take about one minutes to run. Are you ready (y/n)?”
    echo “”
    echo “”
    echo “”
    read answer
    if [ $answer = "n" ]; then
    echo “”
    echo “”
    echo “”
    echo OK. Script will now terminate. Thank you.
    exit 0
    fi

    cd /

    echo “”
    echo “”
    rm -rf /Library/Logs/
    rm -rf /Users/workstation/Library/Logs/
    rm -rf /Users/fieldtech/Library/Logs/
    echo “User Account Log Files, and Main Library Logs have been deleted!”
    echo “”
    sleep 1

    echo “”
    echo “”
    rm -r /Messages\ Received/*
    rm -r /Users/workstation/Downloads/*
    rm -r /Users/fieldtech/Downloads/*
    rm -r /var/root/Downloads/*
    echo “The downloads & Messages Received folders have all been deleted!”
    echo “”
    sleep 1

    echo “”
    echo “”
    rm -rf /var/vm/swap*
    echo “swapfiles deleted!”
    echo “”
    sleep 1

    rm -rf /var/db/volinfo.database
    rm -rf /var/db/volinfo.database
    echo “volinfo databases deleted!”
    echo “”
    sleep 1

    rm -rf /var/db/BootCache.playlist
    echo “bootcaches deleted!”
    echo “”
    sleep 1

    rm -rf /System/Library/Caches/*
    echo “library caches deleted!”
    echo “”
    sleep 1

    rm -dr /var/root/Library/Caches/*
    rm -dr /Users/workstation/Library/Caches/*
    rm -dr /Users/fieldtech/Library/Caches/*
    echo “all individual user library caches deleted!”
    echo “”
    sleep 1

    rm -rf /System/Library/Extensions.kextcache
    echo “extension kextcaches deleted!”
    echo “”
    sleep 1

    rm -rf /tmp/*
    rm -rf /var/tmp/*
    echo “temp files deleted!”
    echo “”
    sleep 1

    rm -rf /.Trash
    echo “trash files deleted!”
    echo “”
    sleep 1

    rm -f /var/vm/sleepimage
    rm -rf /.com.apple.NetBootX/
    echo “sleepimage files deleted!”
    echo “”
    sleep 1

    rm -rf /Users/workstation/Library/Preferences/ByHost/
    rm -rf /Users/workstation/Library/Keychains/login.keychain
    echo “ByHost files and keychains deleted from workstation account!”
    echo “”
    sleep 1

    rm -rf /Users/fieldtech/Library/Preferences/ByHost/
    rm -rf /Users/fieldtech/Library/Keychains/login.keychain
    echo “ByHost files and keychains deleted from fieldtech account!”
    echo “”
    sleep 1

    rm -rf /Library/Preferences/ByHost/
    echo “ByHost files deleted from root account!”
    echo “”
    sleep 1

    rm -rf /Library/NETAepoagt/scratch/props.ini
    echo “the epo/virus props.ini file has been deleted!”
    echo “”
    sleep 1

    rm -rf /Library/NETAepoagt/scratch/props.bak
    echo “the epo/virus props.bak file has been deleted!”
    echo “”
    sleep 1

    rm -rf /Users/workstation/Library/Preferences/com.apple.recentitems.plist
    rm -rf /Users/fieldtech/Library/Preferences/com.apple.recentitems.plist
    rm -rf /var/root//Library/Preferences/com.apple.recentitems.plist
    echo “the apple menu recent items list has been deleted!”
    echo “”
    sleep 1

    defaults delete com.apple.finder FXRecentFolders
    echo “Finder’s Go -> Recent Folders list has been deleted!”
    echo “”
    sleep 1

    rm -dr /Users/workstation/Library/Recent\ Servers
    rm -dr /Users/fieldtech/Library/Recent\ Servers
    rm -dr /private/var/root/Library/Recent\ Servers
    echo “all recent servers been deleted!”
    echo “”
    sleep 1

    rm -r /System/Library/User\ Template/English.lproj/*
    echo “the english.lproj folder has been emptied!”
    echo “”
    echo “”
    echo “please stand by: the workstation user account is copied as a template”
    echo “for creating new user accounts. THIS TAKES ABOUT 30 SECONDS.”

    echo “”
    echo “”

    cp -Rp /Users/workstation/* /System/Library/User\ Template/English.lproj/
    echo “the workstation account has been duplicated to the english.lproj folder!”
    sleep 2
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “”
    echo “now ending script and quitting terminal”
    sleep 3

    killall Terminal

    exit 0

  9. Gil Burns Says:

    The scutil syntax should be:

    /usr/sbin/scutil –-set ComputerName “OSX_Standard_Image”
    /usr/sbin/scutil –-set LocalHostName “ OSX_Standard_Image”

    You might also want to set:
    /usr/sbin/scutil –-set HostName “ OSX_Standard_Image”

    You might also want to delete:
    /bin/rm “/System/Library/Extensions.kextcache”

  10. GregN Says:

    Gil:

    You’re right about the scutil syntax, and that’s what’s in the source of this article, but WordPress seemed to have munged it up on display. I added some different formatting tags and now it looks right!

    I don’t set the HostName, as that is set automatically via DNS in our environment on first boot, so setting it in the image is pointless (for us).

    Unless you change the kernel extensions in your image _after_ you create your image there should be no need to delete the Extensions.kextcache, since the cache will reflect the current set of kernel extensions. Deleting it shouldn’t hurt anything, but will make the initial startup after imaging take longer.


  11. Great scripts.
    Is there anything we should modify for Snow Leopard?

  12. Charlie Says:

    Using this

    rm -rf /Users/Shared/*

    can get rid of the licensing information for several programs (suitcase for one) and some common stuff put there by the likes of Adobe (not that they should have!).

  13. Adam Says:

    Yeah, I am wondering what modifications other sysadmins have made for 10.6. Currently working on a new image.

  14. GregN Says:

    Charlie wrote:

    “Using this

    rm -rf /Users/Shared/*

    can get rid of the licensing information for several programs (suitcase for one) and some common stuff put there by the likes of Adobe (not that they should have!).”

    No-one should use my script without:
    1) Understanding what it does, and
    2) Making changes you might need for your own specific situation.

    For us, we don’t install any software in our image that writes anything important to /Users/Shared.

    And we all should be moving away from this type of image-building anyway, and toward something like InstaDMG or at least something that uses the same principles…

  15. david k Says:

    one thing we’ve started to use with our “universal” 10.6.X image (one that can be applied to any intel mac) are these lines of code once the computer first boots:

    sudo update_dyld_shared_cache -force

    shutdown -r +1 &

    this prevents all of the “dyld shared cached file was build against a different libsystem.dylib ignoring cache” errors that we’re getting due to changing from one mac to another.

  16. GregN Says:

    connectionfailure writes:
    “Is there anything we should modify for Snow Leopard?”

    I don’t know, as I’m not using this type of workflow in Snow Leopard — I’ve moved to a more modular workflow similar to InstaDMG.


  17. [...] at Disney. That said, a shell script for cleaning up a machine prior to imaging it has been here Image cleanup script Managing OS X for quite a while. But you will need to modify it and test it. Dont forget to make it executable [...]


  18. [...] when installed on a new computer before you make the disk image or make your master clone: Image Cleanup Script. This will help you avoid left over files during setup or Kerberos [...]

  19. Johannes Says:

    Hi,

    as you seem very professional in cleaning up a Mac, you’ll be probably able to help me. When I try to run a backup of my Mac OSX (10.6.8) with Super Duper (bootable backup) I run into an error:
    WARNING: Source: /.com.apple.NetBootX/sleepimage, lstat(): 0
    WARNING: Target: /Volumes/System Backup/.com.apple.NetBootX/sleepimage, lstat(): -1
    /.com.apple.NetBootX/./sleepimage: Input/output error

    I am wondering how I can get this problem solved? I read that the NetbootX is for booting my Mac via the Net (although I never did yet). I run a disk check and repaired the permissions. Do you have any recommendations?

    /Johannes


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