Smarthost With SMTP Authentication For Sendmail

First we have to create the authentication information

cd /etc/mail
mkdir auth
chmod 700 auth
cd auth
vi client-info

Enter the following, substituting the desired mail server, username and password

AuthInfo:mail.server.com "U:username" "P:password"

Now we create the hash

makemap hash client-info < client-info
chmod 600 client-info*
cd /etc/mail
vi sendmail.mc

Now we tell sendmail to smarthost and use our authentication hash, substituting the desired mail server

define(`SMART_HOST',`mail.server.com')dnl
define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
FEATURE(`authinfo',`hash /etc/mail/auth/client-info')dnl

Find the existing line for smarthost and replace it with those three lines.

Lastly, rebuild the config and restart sendmail

m4 sendmail.mc > sendmail.cf
service sendmail restart

How To Disable IPv6 On CentOS 6, RHEL 6

Since not everyone has access to IPv6 and leaving it enabled when not in use is a waste of resources, you an disable IPv6 via the following.

Add the following to /etc/sysctl.conf:

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1

To disable it on a running system, without reboot:

echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6
echo 1 > /proc/sys/net/ipv6/conf/default/disable_ipv6

How To Disable IPv6 On CentOS 5, RHEL 5

Since not everyone has access to IPv6 and leaving it enabled when not in use is a waste of resources, you an disable IPv6 via the following.

Add the following to /etc/sysctl.conf:

net.ipv6.conf.all.disable_ipv6 = 1

To disable it on a running system, without reboot:

echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6

Enable Or Disable Backup Completion Email Messages Notices In DirectAdmin

Edit: /usr/local/directadmin/data/admin/backup.conf

To Enable:

message=yes

To Disable:

message=no

Debugging DirectAdmin Cronjobs

/usr/local/directadmin/dataskq d2000
tail -f /var/log/directadmin/system.log

Update Used Diskspace Quota For One User In DirectAdmin

echo "action=quotatally&value=[username]&type=user" >> /usr/local/directadmin/data/task.queue

Install Suhosin For PHP 5.4 On cPanel Linux

1) Grab the current source from github:

cd /usr/local/src

wget https://github.com/stefanesser/suhosin/tarball/master

tar zxvf master

2) Change to the directory just created and then prep Suhosin for PHP

cd /usr/local/src/stefanesser-suhosin-[this will change]

mv session.c session.c.old
wget https://raw.github.com/blino/suhosin/117b6aa6efec61afaa1431c698dad8eb553b55f5/session.c

phpize

Note: We pull the custom session.c above to fix an issue with NULL sessions in PHP 5.4, more info:
https://github.com/stefanesser/suhosin/pull/26

3) Configure, make and install

./configure && make && make install

4) Enable in PHP

echo extension=suhosin.so >> /usr/local/lib/php.ini

5) Restart Apache and check PHP

service httpd restart

php -v

...and you should see:

PHP 5.4.21 (cli) (built: Oct 23 2013 16:48:02)
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies
with Zend Guard Loader v3.3, Copyright (c) 1998-2013, by Zend Technologies
with Suhosin v0.9.34-dev, Copyright (c) 2007-2012, by SektionEins GmbH