Created
March 11, 2020 03:39
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Docker multiple images unique layers size total sum
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| #!/usr/bin/perl | |
| ## Purpose: | |
| # To get the real size of your app that is comprised of many services/images. | |
| # This script sums only the sizes of unique image layers. | |
| # This way you can get a better sense of the total size of your app and make optimizations if needed. | |
| ## Usage: | |
| # ./docker_images_size.pl IMAGE1:TAG1 IMAGE2:TAG2 ... | |
| ## Example: | |
| # ./docker_images_size.pl eventstore/eventstore:release-5.0.3 eventstore/eventstore:release-5.0.6 | |
| use strict; | |
| use warnings; | |
| my $cmd; | |
| my $cmdOut; | |
| my @lines; | |
| my %hImageSizes; | |
| my $totalSize=0; | |
| my $prevImageId = ''; | |
| my @argvImages = (); | |
| for (my $iargv=0; $iargv<=$#ARGV; $iargv++) { | |
| push(@argvImages, $ARGV[$iargv]); | |
| } | |
| foreach my $imageName (@argvImages) { | |
| print "-> calculating size for image: $imageName\n"; | |
| $cmd = "docker image history --format \"{{.ID}} {{.Size}}\" $imageName"; | |
| # print "$cmd\n"; | |
| $cmdOut = `$cmd`; | |
| # print "$cmdOut\n"; | |
| @lines = split(/\n/, $cmdOut); | |
| foreach my $line (@lines) { | |
| my @aLine = split(' ', $line); | |
| my $imageId = $aLine[0]; | |
| my $imageSize = $aLine[1]; | |
| if ($hImageSizes{$imageId}) { | |
| print "-> imageId $imageId has already been added to the total sum\n"; | |
| $prevImageId = $imageId; | |
| next; | |
| } | |
| my $size = sizeExpand($imageSize); | |
| # print "$imageId $size\n"; | |
| if ($imageId =~ m/missing/) { | |
| if ($hImageSizes{$prevImageId}) { | |
| # this base image was already added to the sum | |
| # print "-> base image imageId $prevImageId has already been added to the total sum \n"; | |
| last; | |
| } | |
| # this is a base image layer, getting the base image total size | |
| my $cmd = "docker image ls | grep $prevImageId | head -n 1 | awk '{print \$NF}'"; | |
| # print "-> $cmd\n"; | |
| my $cmdOut = `$cmd`; | |
| # print "-> $cmdOut\n"; | |
| $size = sizeExpand($cmdOut); | |
| $hImageSizes{$prevImageId} = $size; | |
| last; | |
| } | |
| $hImageSizes{$imageId} = $size; | |
| $prevImageId = $imageId; | |
| } | |
| } | |
| for my $imageId (keys(%hImageSizes)) { | |
| $totalSize += $hImageSizes{$imageId}; | |
| } | |
| print "\n\nTOTAL SIZE: ".($totalSize/1000000000)." GB\n"; | |
| sub sizeExpand { | |
| my ($size) = @_; | |
| if ($size =~ m/\dB$/i) { | |
| $size =~ s/B$//i; | |
| } | |
| elsif ($size =~ m/kB$/i) { | |
| $size =~ s/kB$//i; | |
| $size *= 1000; | |
| } | |
| elsif ($size =~ m/MB$/i) { | |
| $size =~ s/MB$//i; | |
| $size *= 1000000; | |
| } | |
| elsif ($size =~ m/GB$/i) { | |
| $size =~ s/GB$//i; | |
| $size *= 1000000000; | |
| } | |
| return $size; | |
| } |
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