How To Allow Cross-Site Javascript Using Apache

Author: erics, September 24th, 2015

The key is to send a response header like this: Access-Control-Allow-Origin: * In the Apache web server, one enables this via the following directive: Header set Access-Control-Allow-Origin * This requires the use of mod_headers, which is enabled by default in Apache. For example:

LoadModule headers_module modules/mod_headers.so
...
<VirtualHost *:80>
    ServerName www.your.domain
    ServerAlias *your.domain
    DocumentRoot /var/www/yourdomain
    DirectoryIndex index.php index.html
    Header set Access-Control-Allow-Origin *
</VirtualHost>

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LoadModule headers_module modules/mod_headers.so

...

ServerName www.your.domain

ServerAlias *your.domain

DocumentRoot /var/www/yourdomain

DirectoryIndex index.php index.html

Header set Access-Control-Allow-Origin *

</VirtualHost>

Categories: How-To's, Technology Tags: Access-Control-Allow-Origin, ajax, apache, cross, cross-site, cross-site javascript, headers, howto, http, javascript, Load, mod_headers, tips, xsite | No comments

How To Auto-Restart Apache If the Load Gets Too High

Author: erics, September 15th, 2015

The script to check and restart apache…works on CentOS – YMMV!

#!/bin/bash
MAXLOAD=6
check=$(uptime | awk -F'average: ' '{print $2}' | awk '{print $1}' | tr -d ',')
if [[ $check > $MAXLOAD ]]; then
	/sbin/service httpd stop
	HOST=`hostname`
	echo $HOST | mailx -s "$HOST load alert - apache STOPPED by cron script" load.alert@your.domain
	sleep 300
	/sbin/service httpd start
	echo $HOST | mailx -s "$HOST load alert - apache STARTED by cron script" load.alert@your.domain
fi

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#!/bin/bash

MAXLOAD=6

check=$(uptime | awk -F'average: ' '{print $2}' | awk '{print $1}' | tr -d ',')

if [[ $check > $MAXLOAD ]]; then

/sbin/service httpd stop

HOST=`hostname`

echo $HOST | mailx -s "$HOST load alert - apache STOPPED by cron script" load.alert@your.domain

sleep 300

/sbin/service httpd start

echo $HOST | mailx -s "$HOST load alert - apache STARTED by cron script" load.alert@your.domain

fi

Add to cron * * * * * /root/restart_apache_if_load_hits_threshold.sh >> /var/log/restart_apache_if_load_hits_threshold.log 2>&1

Categories: How-To's, Technology Tags: apache, AWK, bash, CentOS, howto, httpd, Load, load average, Restart, Stop, tips, Uptime | No comments

How To Find the Template File Name per Page in WordPress using SQL

Author: erics, September 5th, 2015

SELECT DISTINCT `meta_value` FROM `wp_postmeta` WHERE `meta_key` LIKE '_wp_page_template'

1	SELECT DISTINCT `meta_value` FROM `wp_postmeta` WHERE `meta_key` LIKE '_wp_page_template'

Categories: How-To's, Technology Tags: File, File Name, howto, Page, Template, tips, WordPress | No comments

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Entries from September 2015

How To Allow Cross-Site Javascript Using Apache

How To Auto-Restart Apache If the Load Gets Too High

How To Find the Template File Name per Page in WordPress using SQL

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