fduran

// www.fduran.com
// send mail with Amazon AWS SES without extra library
// needs Pear: apt-get install php-pear 
<?php
function mailSES($to, $subject, $body, $from)
{
        include_once('Mail.php');

	$headers["From"] = $from;
	$headers["To"] = $to;

fduran

# www.fduran.com
# delete files in a folder older than a number of days (100 for example)
find /path/to/folder -mtime +100 -exec rm -f {} \;

fduran

# www.fduran.com
MySQL Master-Slave Replication Notes


Master
/etc/mysql/my.cnf
server-id               = 100
log_bin                 = /var/log/mysql/mysql-bin.log
binlog-do-db            = wpdb
binlog-ignore-db        = mysql

fduran

# www.fduran.com
# Create Java KeyStore from SSL certificate for domain example.com

# Change format from cert.crt PEM (----BEGIN CERTIFICATE----- ...  -----END CERTIFICATE-----) to DER
openssl x509 -in cert.crt -inform PEM -out cert.der -outform DER

# create KeyStore cert.jks for your domain ("alias" in keytool, "common name" or CN in openssl req)
keytool -import -trustcacerts -alias example.com -file cert.der -keystore cert.jks

fduran

# www.fduran.com
# python script to test/monitor if a Django site using authentication is up
# with logging output to a file including response times
# use in cronjob and output to log file, for ex: python /path/to/script.py >> /var/log/webmonitor.log

# bash: install pip if not already in system
apt-get install python-setuptools python-dev build-essential
easy_install -U pip

# bash: install requests

fduran

# www.fduran.com
# Linux "Too many files open" error

# check current number of open files:
lsof |wc -l

# check maximum number of file descriptors
sysctl -a |grep file-max

# increment value: edit

fduran

# www.fduran.com
# Apache2 optimization
 
# apache-wide (/etc/apache2/apache2.config ):
# compression
AddOutputFilterByType DEFLATE text/html text/plain text/xml text/css application/javascript
BrowserMatch ^Mozilla/4 gzip-only-text/html
BrowserMatch ^Mozilla/4\.0[678] no-gzip
BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
 

fduran

# www.fduran.com
# redirect from apache port (:8080 for ex for tomcat etc) to subdomain
 
# in apache config:
<VirtualHost *:80>
    ServerName subdomain.example.com
    ProxyPass / http://127.0.0.1:8080/
    ProxyPassReverse / http://127.0.0.1:8080/
</VirtualHost>

fduran

# www.fduran.com
# files opened for writing
lsof | grep -e "[[:digit:]]\+w"

fduran

<h1>CloudFlare Always Online</h1>

<b>Summary:</b>  I'd like to know if CloudFlare's <a href="http://www.cloudflare.com/always-online">Always Online</a> works when a web server goes completely down (server unresponsive).

1) According to CloudFlare's web site, the answer seems to be "yes" (emphasis mine):
<ul>
<li><a href="http://www.cloudflare.com/always-online">Description of the service</a>: Always Online is a feature that caches a static version of your pages in case your <b>server goes offline</b>.</li>
<li><a ref="http://blog.cloudflare.com/always-online-because-downtime-sucks">Blog entry</a>: "If, for any reason, your web host or service provider <b>goes down</b>, we kick in to keep your site online"</li>
<li><a href="https://cloudflare.tenderapp.com/kb/troubleshooting/why-doesnt-always-online-display-all-pages-of-my-site-when-my-server-is-down">KB documentation</a>: on the point 7: "In order to trigger Always Online, your web server will need to be <b>completely unresponsive</b>, or ..."</li>
<li>In a