If you push play, the video should scoot out to about the 14m40s mark where MySQLTuner appears on one of the slides. Thanks to Trent Hornibrook for letting me know!

MySQLTuner mentioned at the O'Reilly MySQL Conference is a post from: Major Hayden's Racker Hacker blog.

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To do this, simply bring up a CPAN shell:

perl -MCPAN -e shell

Run these two commands in the CPAN shell:

o conf prerequisites_policy follow
o conf commit

Now, exit the CPAN shell, start the CPAN shell, and try to install a module that you need. All dependencies will be automatically confirmed, downloaded and installed.

The first line sets your dependency policy to follow rather than ask (the default). The second line tells CPAN to write the changes to your user's CPAN configuration file to make them permanent.

A big thanks goes out to Lee Hambley for the fix.

WARNING: There are some occasions where you would not want to install dependencies from CPAN. Examples of these situations are when your operating system's package manager (yum, up2date, apt-get, aptitude, etc) has installed Perl modules in an alternative location or when you have manually installed modules in a non-standard way. I'm a Red Hat guy, and these problems rarely arise on Red Hat/Fedora systems, but your mileage may vary.

CPAN: Automatically install dependencies without confirmation is a post from: Major Hayden's Racker Hacker blog.

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If you want to know when the latest releases are available, there are multiple options:

• Follow RackerHacker on Twitter
• Sign up for the MySQLTuner mailing list
• Use the --checkversion option when you run the script

MySQLTuner 0.9.9 is now available is a post from: Major Hayden's Racker Hacker blog.

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Use of uninitialized value in string eq at /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi/VMware/VmPerl.pm line 114.

You can run the vmware-cmd application with this error (it's not a fatal error) and keep going with your normal business. However, if you want to remove the error, comment out lines 114 and 115 in the Perl module referenced by the error:

die "Perl API Version does not match dynamic library version."
    unless (version() eq $VERSION);

Commenting out these lines does not affect the VMWare server in any way.

CentOS/RHEL x86_64 + VMWare: Use of uninitialized value in string is a post from: Major Hayden's Racker Hacker blog.

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I was struggling to find a way to reconfigure CPAN to use HTTP mirrors rather than FTP, but I couldn't figure out where CPAN was holding this data. It wasn't in ~/.cpan and there was nothing in /etc for it. However, I found that you can reconfigure CPAN by running the following command:

# perl -MCPAN -e shell
CPAN: File::HomeDir loaded ok (v0.69)

cpan[1]> o conf init

The configuration script will run again as if you had never configured CPAN. Best of all, if you need to stop mid-way through the reconfiguration, your original configuration is still there. If you'd rather just adjust your mirror list rather than starting over completely with the CPAN configuration, use the following:

Display your current mirrors:
o conf urllist

Delete the first mirror in your list:
o conf urllist shift

Delete the last mirror in your list:
o conf urllist pop

Add on a new mirror:
o conf urllist push http://cpan.mirror.facebook.com/

Save your mirror changes:
o conf urllist commit

Adjusting CPAN mirror list is a post from: Major Hayden's Racker Hacker blog.

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The article goes over installing the Net::Amazon::S3 Perl module via WHM (which is handy for the cPanel users). However, if you're not a cPanel user, you can install it via CPAN:

# perl -MCPAN -e 'install Net::Amazon::S3'

If you'd rather install it through Webmin, go to the 'Others' section, and click 'Perl Modules'.

Also, Tim mentions configuring a Firefox extension for accessing S3 that works very well. However, I find myself using Safari most often, so I prefer to use Jungle Disk or Transmit on my Mac.

Overall, it's a great post, and I'm glad Tim told me about it!

Backing up MySQL to Amazon's S3 is a post from: Major Hayden's Racker Hacker blog.

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unable to call function somefunction on undefined value

Of course, replace somefunction with your function of choice. To correct the issue, you can force CPAN to bring back a more sane version of Scalar::Util:

# perl -MCPAN -e shell
cpan> force install Scalar::Util

Red Hat Perl Issues: unable to call function somefunction on undefined value is a post from: Major Hayden's Racker Hacker blog.

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