A few weeks ago I mentioned the wesley.pl script from GitHub to optimize images, and how I had modified it to keep (or discard) the EXIF / XMP information. Making sure images are as small as possible is important to save bandwidth and improve page load times (and google rank), so I think it’s worth discussing my image optimization process in more detail.
Surnia Ulula
UNIX Ideas for SysAdmins
Wesley.pl optimize script for jpeg, png, and gif
Aside by Jean-Sebastien Morisset
- Saturday, December 29th, 2012 - (1)
To improve page load times (and Google ranking), you should make sure all jpeg, png, and gif files are properly optimized. Instead of writing my own script for jpegtran, pngcrush, and gifsicle, I used Mike Brittain’s Wesley.pl script on GitHub. It works great, though I did have to modify it to change the “jpegtran -copy” parameter it uses — I need to keep the EXIF on larger files, and strip it from thumbnails. I posted the diff on the GitHub Issues page.
Update 2012-12-31 : In case Mike doesn’t merge my diff, with the addition of the
--copy=[all|comments|none]command-line argument (see my comment bellow for more info), you can download the patched wesley.pl script here instead.
check-httpd-limits v2.3
Aside by Jean-Sebastien Morisset
- Tuesday, December 11th, 2012 - (0)
check_httpd_limits.pl compares the size of running Apache httpd processes, the configured prefork / worker / event MPM limits, and the server’s available memory. The script exits with a warning (or error message) if the configured limits exceed the server’s available memory.
Read more on the check-httpd-limits project page, or from the Check Apache Httpd MPM Config Limits article posted earlier…
Continue reading…
WordPress OS Disk Cache Report, Prime and Flush
I wrote a bash script this morning to report the size of WordPress cache folders, the number of files they contain, read each file to prime the OS disk cache, and optionally flush the OS disk cache as well. This might be a script you could execute to email a daily/weekly report of cache folder sizes, or perhaps execute during/after booting a server to prime the OS disk cache, or even on a regular schedule to make sure the OS cache is always primed. The script also has a “flush” argument to sync and drop the OS disk cache, which isn’t very useful (to me) except to see the difference in speed between a clean and primed cache (about 11s vs 0.4s for all websites on my server).
Quick Freeze / Thaw of Reverse Zones
I had to update several reverse zone files today, so wrote a quick for-loop in bash to freeze and thaw all the zones. The script parsed the zone file names and reversed them into a proper d.c.b.a.in-addr.arpa format. Later I tweaked it with sed to make it more flexible (in order to pass it a full or partial IP address), but ended up using tac for the reversing part instead – that’s what it’s made for after all. And if you’re wondering what tac stand for, just read cat backwards. :-)
Create and Update OTRS Tickets from the Command-Line
I recently wrote a notification script for Centreon / Nagios to create and update tickets in OTRS. The ticket details and OTRS connection settings are all defined on the command-line. The GenericTicketConnector.yml must first be installed in OTRS, and a user (aka “Agent”) created for the script. I used perl’s taint mode, so had to hard-code the various log file locations ($logfile, $csvfile, and $dbfile). The Log::Handler module allows the script to output and log different amounts of activity detail, and the DBD::SQLite module is used to keep a local database of the Ticket ID (from OTRS) and the Problem ID (from Centreon / Nagios) associations — so the OTRS ticket can be updated with follow-up notifications from Centreon / Nagios for the same issue.
Change Passwords with SSH and Expect
A few years ago I was supporting a very diverse environment with Solaris, AIX, and Linux servers; some with password logins, public/private key authentication, and several with SecurID passwords. All accounts were local, passwords expired every three months, and the accounts locked after three failed logins — so you can imagine the mess this created if you didn’t go around every server at least every three months. After I’d accumulated about half a dozen passwords, I wrote an Expect script to login and change my password and wrapped it with a bash script to try every old password I had. Since some servers needed a SecurID number to login, the bash script would pause on those and prompt me for the token before continuing.
Conceal Email Address with JavaScript
I wrote this perl script years ago when I needed to include my email address on a webpage, but also conceal it from spam bots and spiders.
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#!/usr/bin/perl -w # /usr/local/bin/esc-mailto.pl # Conceal email address with javaScript. # by Jean-Sebastien Morisset (http://surniaulula.com/) use strict; my ($email, $text) = @ARGV; $text = $email if (!$text); if ($email && $text) { my $mailto = "<a href=\"mailto:$email\" class=\"esc-mailto\">$text</a>"; $mailto =~ s/(.)/sprintf("%%%x", ord($1))/ge; print "<script language=\"JavaScript\">document.write(unescape(\"$mailto\"))</script>\n"; } else { print "syntax: $0 {email_address} [optional_link_text]\n"; exit 1; } exit 0; |
Freelance UNIX SysAdmin
Looking for a Sr UNIX Systems Administrator specializing in Systems Integration? I may be available for freelance or contract work, either remotely or on-site. You can contact me by email at jsm@surniaulula.com to discuss solutions specific to your needs.
- Location : Montreal QC, Canada
- Availability : 4-8 hrs / week freelance
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