Activating error 503 from a shell script
During deployment of a new version of a website you might want to have your server returning an error 503 (temporarily unavailable). You can easily do this by pointing your web folder to a php page that contains this:
//server_down.php header("HTTP/1.1 503 Service Unavailable"); echo "We are deploying a new version of NoSoapNoBubbles, the server is going to be down for a minute.";
if your webfolder is linked to another folder with a symlink (as I explained in my previous post symfony project on bluehost shared hosting) then you can just remove the link and add a new one pointing to the folder containing server_down.php. Remember to rename server_down.php index.php or to create an .htaccess file containing
DirectoryIndex server_down.php
so that server_down.php is shown as directory index.
This solution is more than fine, but I needed to access some files during deployment so I decided to use a combination of the approach above and .htaccess. When the web directory (of our dev site) is being wiped out, then I redirect using the link, when the directory is filled but I’m running DB tasks I redirect using .htaccess.
Since our deploy tasks are fully automated (happen on svn commit) here how to edit the .htaccess file using SED (stream editor).
Activate redirection:
if [ "$#" != "1" ]; then echo Invalid number of arguments, must be 1. >&2 exit 1 fi # HTACCESSPATH=$1 #path to the .htaccess file cp $HTACCESSPATH/.htaccess $HTACCESSPATH/.htaccessTMP sed 's|#*RewriteCond %{REQUEST_URI} !server_down.php\$|RewriteCond %{REQUEST_URI} !server_down.php\$|' $HTACCESSPATH/.htaccessTMP > TMPFILE && mv TMPFILE $HTACCESSPATH/.htaccessTMP sed 's|#*RewriteCond %{REQUEST_URI} !always_available.php\$|RewriteCond %{REQUEST_URI} !always_available.php\$|' $HTACCESSPATH/.htaccessTMP > TMPFILE && mv TMPFILE $HTACCESSPATH/.htaccessTMP sed 's|#*RewriteRule ^(.*)\$ /server_down.php \[L\]|RewriteRule ^(.*)\$ /server_down.php [L]|' $HTACCESSPATH/.htaccessTMP > TMPFILE && mv TMPFILE $HTACCESSPATH/.htaccessTMP mv $HTACCESSPATH/.htaccessTMP $HTACCESSPATH/.htaccess</code> Deactivate redirection:<code>if [ "$#" != "1" ]; then echo Invalid number of arguments, must be 1. >&2 exit 1 fi # HTACCESSPATH=$1 cp $HTACCESSPATH/.htaccess $HTACCESSPATH/.htaccessTMP sed 's|RewriteCond %{REQUEST_URI} !server_down.php\$|#RewriteCond %{REQUEST_URI} !server_down.php\$|' $HTACCESSPATH/.htaccessTMP > TMPFILE && mv TMPFILE $HTACCESSPATH/.htaccessTMP sed 's|RewriteCond %{REQUEST_URI} !always_available.php\$|#RewriteCond %{REQUEST_URI} !always_available.php\$|' $HTACCESSPATH/.htaccessTMP > TMPFILE && mv TMPFILE $HTACCESSPATH/.htaccessTMP sed 's|RewriteRule ^(.*)\$ /server_down.php \[L\]|#RewriteRule ^(.*)\$ /server_down.php [L]|' $HTACCESSPATH/.htaccessTMP > TMPFILE && mv TMPFILE $HTACCESSPATH/.htaccessTMP mv $HTACCESSPATH/.htaccessTMP $HTACCESSPATH/.htaccess
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