7000 and 8000 series 3ware Escalade™ ATA RAID controllers manual http://www.3ware.com/support/UserDocs/CLI_UG.pdf http://www-d0.fnal.gov/~melnit/tw_cli.8.html
PowerDNS with Geo Backend
December 6th, 2008 | Posted in Linux, PowerDNS | 1 Comment
A short guide on how to setup powerdns with the geo and mysql backends to redirect visitors to servers closer to their geographic location. So how does it work? We delegate geo.www.domain.com to our powerdns servers that run the geo backend. The backend looks up the IP address of the user’s resolver in a data [...]
Sending mail from Perl
December 3rd, 2008 | Posted in Linux, Perl | No Comments
I am using this as a skeleton in various scripts where I need to be notified of errors or successful runs… #!/usr/bin/perl open(MAIL,”|/usr/lib/sendmail -t”); print MAIL “To: you\@domain.com\n”; print MAIL “From: name \n”; print MAIL “Subject: your subject\n\n”; print MAIL “\nnotification\n”; close (MAIL);
Speed up your site by caching
December 2nd, 2008 | Posted in Linux | No Comments
Implementing caching on high traffic websites will save you loads of bandwidth and drastically speed up your site loading time for visitors. By using apache modules mod_expires and mod_header you will be able to control exactly what is cached, how long it’s cached for and how proxy servers should behave around your websites. All static [...]
sed inline replace/delete
December 2nd, 2008 | Posted in Linux | No Comments
sed -i ‘s/foo/bar/’ file(s) or * or sed -i ‘/foo/d’ file(s) or * or find /path/to/files -type f -name myfile1 -exec sed -i ‘s/foo/bar/’ {} \; or find /path/to/files -type f -name myfile1 | xargs sed -i ‘s/foo/bar/g’
awk quotes
December 2nd, 2008 | Posted in Linux | No Comments
cat file | awk ‘{ print “mysql mydatabase -u ” $3 ” -p”$4″ -h ” $2 ” -e \042SELECT name FROM domains WHERE status = \0470\047\042 >> “$1″.active”}’ echo -e “\047″ \047 being a single quote \042 being a double quote
unix print ip
November 29th, 2008 | Posted in Linux | No Comments
If you ever needed to get your own IP from shell to use in scripts… host $(who -m | awk ‘{ print $5 }’ | sed ‘s/[()]//g’) | awk ‘{ print $4 }’ Above code is used in a script which updates apache ACL’s with current IP… makes it much easier than manually editing.
grep copy
November 29th, 2008 | Posted in Linux | No Comments
#!/usr/bin/sh cp `grep -lr ‘STRING’ /dir` /newdir
sudo: sorry, you must have a tty to run sudo
November 29th, 2008 | Posted in Linux | 1 Comment
ssh -t -t login host or vi /etc/sudoers #Default requiretty :wq Quoted directly from /etc/sudoers # Disable “ssh hostname sudo “, because it will show the password in clear. # You have to run “ssh -t hostname sudo “.
Disable SSLv2
November 29th, 2008 | Posted in Linux | No Comments
/etc/httpd/conf.d/ssl.conf: SSLCipherSuite ALL:!ADH:!LOW:!SSLv2:!EXP:+HIGH:+MEDIUM SSLProtocol all -SSLv2