Since there are alot of people asking for it, here is my HowTo about mod_ruid2
This is based on my CentOS server with Apache 2.x.

Installing this module its no longer needed to chmod config files to 666 or upload/attachments directories to 777. Since with this module enabled everything @ HTTP will run under the user itself and not ‘apache’ anymore.

** If you are using mod_ruid instead of mod_ruid2, first of all remove the mod_ruid line from ‘/etc/httpd/conf/httpd.conf‘

First, we are going to install libcap-devel
yum -y install libcap-devel
After this is done we are going to download and install mod_ruid2
wget http://dave.t0xic.nl/tars/mod_ruid2-0.9.tar.bz2
tar xjf mod_ruid2-0.9.tar.bz2
cd mod_ruid2-0.9
apxs -a -i -l cap -c mod_ruid2.c

Now, if you didn’t get any errors mod_ruid2 should be installed and added to the ‘/etc/httpd/conf/httpd.conf‘.
Lets confirm mod_ruid2 is added
grep 'mod_ruid2' /etc/httpd/conf/httpd.conf
If you get any response like below its installed

LoadModule ruid2_module /usr/lib/apache/mod_ruid2.so

Now we need to modify the DA httpd.conf templates a little bit to enable mod_ruid2 for the users

Now copy the template files to custom
cd /usr/local/directadmin/data/templates/
cp virtual_host2* custom/
chown -R diradmin:diradmin custom/

Now you have copied the original templates to the ‘custom’ directory, so they won’t be overwritten.

Now follow the steps below for each virtual_host2 file you’ve copied
nano -w virtual_host2.conf

## replace line: SuexecUserGroup |USER| |GROUP|
## replace with: #SuexecUserGroup |USER| |GROUP|
## Add the lines below under the just replaced line
RMode config
RUidGid |USER| |GROUP|
RGroups apache

Save the files and lets rewrite the HTTPd config files
echo "action=rewrite&value=httpd" >> /usr/local/directadmin/data/task.queue

If you want you can start the rewrite of the HTTPd config files manually, just paste the line below and wait when its done
/usr/local/directadmin/dataskq d800
After the rewrite is complete you can restart HTTPd with the command below
/etc/init.d/httpd restart
Now mod_ruid2 should be installed and you don’t need to chmod anymore like ‘chmod 666 config.php’ or ‘chmod 777 uploads’.

To be sure the webmail clients etc still works we need to change the owner permissions
chown -R webapps:webapps /var/www/html

** Questions with Answers **
——————————————————-
Q: How can I test this is working?
A: Easy, install some CMS that you are used before. Like WordPress, Joomla that required (before!!) chmod 666 or 777 to get install/working.

Q: I’ve dirs/files owned by apache for some users, must I change this?
A: Yes, you need to give the dirs/files owner of the user itself, not apache anymore. Check below
Thanks for snk for the commands below, to fix the owner permissions of the dirs/files

cd /usr/local/directadmin/scripts && ./set_permissions.sh user_homes
find /home/*/domains/*/public_html -type d -print0 | xargs -0 chmod 711
find /home/*/domains/*/public_html -type f -print0 | xargs -0 chmod 644
cd /usr/local/directadmin/data/users && for i in `ls`; do { chown -R $i:$i /home/$i/domains/*/public_html;}; done;

* Added ‘&&’ so if they do a typo, it won’t change anything.

You are missing a question, or you have a question, please let me know and I’ll try to answer them for you!

1. /etc/sysconfig/network : Turn on networking in this file.
2. /etc/sysconfig/network-scripts/ifcfg-eth0 : Set default IPv6 router IP and server IP address in this file.

Open /etc/sysconfig/network file, enter:
# vi /etc/sysconfig/network
Append following line:

NETWORKING_IPV6=yes

Open /etc/sysconfig/network-scripts/ifcfg-eth0 (1st network config file)
# vi /etc/sysconfig/network-scripts/ifcfg-eth0
Append following config directives for IPv6:

IPV6INIT=yes
IPV6ADDR=<IPv6-IP-Address>
IPV6_DEFAULTGW=<IPv6-IP-Gateway-Address>

Here is my sample file with mix of IPv4 and IPv6 assigned to eth0:

DEVICE=eth0
BOOTPROTO=static
ONBOOT=yes
HWADDR=00:30:48:33:bc:33
IPADDR=202.54.1.5
GATEWAY=202.54.1.3
NETMASK=255.255.255.248
IPV6INIT=yes
IPV6ADDR=2607:f0d0:1002:0011:0000:0000:0000:0002
IPV6_DEFAULTGW=2607:f0d0:1002:0011:0000:0000:0000:0001

Where,

• NETWORKING_IPV6=yes|no – Enable or disable global IPv6 initialization.
• IPV6INIT=yes – Enable or disable IPv6 configuration for all interfaces.
• IPV6ADDR=2607:f0d0:1002:0011:0000:0000:0000:0002 – Specify a primary static IPv6 address here.
• IPV6_DEFAULTGW=2607:f0d0:1002:0011:0000:0000:0000:0001 – Add a default route through specified gateway.

Save and close the file. Restart networking:
# service network restart
Verify your configuration by pinging ipv6 enabled site such as ipv6.google.com:
$ ping6 ipv6.google.com
Sample output:

PING ipv6.google.com(2001:4860:b002::68) 56 data bytes
64 bytes from 2001:4860:b002::68: icmp_seq=1 ttl=59 time=93.2 ms
64 bytes from 2001:4860:b002::68: icmp_seq=2 ttl=59 time=95.0 ms
64 bytes from 2001:4860:b002::68: icmp_seq=3 ttl=59 time=94.2 ms
64 bytes from 2001:4860:b002::68: icmp_seq=4 ttl=59 time=95.2 ms
64 bytes from 2001:4860:b002::68: icmp_seq=5 ttl=59 time=94.8 ms
64 bytes from 2001:4860:b002::68: icmp_seq=6 ttl=59 time=95.1 ms
64 bytes from 2001:4860:b002::68: icmp_seq=7 ttl=59 time=93.3 ms
64 bytes from 2001:4860:b002::68: icmp_seq=8 ttl=59 time=93.8 ms

— ipv6.google.com ping statistics —
8 packets transmitted, 8 received, 0% packet loss, time 7010ms
rtt min/avg/max/mdev = 93.268/94.376/95.268/0.799 ms

Traces path to a network host, enter:
$ traceroute6 ipv6.google.com
Print default IPv6 routing table, enter:
$ route -n -A inet6
Sample output:

Kernel IPv6 routing table
Destination Next Hop Flags Metric Ref Use Iface
::1/128 :: U 0 42531 1 lo
::62.41.14.144/128 :: U 0 0 1 lo
::127.0.0.1/128 :: U 0 0 1 lo
::/96 :: U 256 0 0 sit0
2001:470:1f04:55a::2/128 :: U 0 15201 1 lo
2001:470:1f04:55a::/64 :: U 256 0 0 sit1
fe80::4833:22f4/128 :: U 0 0 1 lo
fe80::212:3fff:fe75:fa0d/128 :: U 0 0 1 lo
fe80::/64 :: U 256 0 0 eth0
fe80::/64 :: U 256 0 0 sit1
ff00::/8 :: U 256 0 0 eth0
ff00::/8 :: U 256 0 0 sit1
::/0 :: U 1 0 0 sit1

1. /etc/modprobe.conf – Kernel driver configuration file.
2. /etc/sysconfig/network – RHEL / CentOS networking configuration file.

/etc/modprobe.conf

Edit /etc/modprobe.conf, enter:
# vi /etc/modprobe.conf
Append the following line:

install ipv6 /bin/true

Save and close the file.

/etc/sysconfig/network

Edit /etc/sysconfig/network, enter:
# vi /etc/sysconfig/network
Update / add as follows:

 
NETWORKING_IPV6=no
IPV6INIT=no

Save and close the file. Restart networking service
# service network restart
# rmmod ipv6
Alternatively, simple reboot the box:
# reboot
Verify IPv6 is disabled, enter:
# lsmod | grep ipv6
# /sbin/ifconfig

Conventionally the command use to change password on Linux based system is passwd
, the option related to this command is –stdin ,an this is all done throughout a pipe.
echo -e "new_password\nnew_password" | (passwd --stdin $USER)

Method 2: chpasswd

Another alternative is to use the chpasswd, explain as below:
echo "password:name" | chpasswd
Note that the first method can be use to change psssword on Samba based system:
echo -e "new_password\nnew_password" | (smbpasswd -a -s $USER)

#!/bin/bash
MAXSIZE=62
array1=(
q w e r t y u i o p a s d f g h j k l z x c v b n m Q W E R T Y U I O P A S D
F G H J K L Z X C V B N M 1 2 3 4 5 6 7 8 9 0 \! \@ \# \$ \% \^ \& \* \( \)
\! \@ \# \$ \% \^ \& \* \( \) \! \@ \# \$ \% \^ \& \* \( \) \! \@ \# \$ \%
)
MODNUM=${#array1[*]}
pwd_len=0
while [ $pwd_len -lt $MAXSIZE ]
do
index=$(($RANDOM%$MODNUM))
echo -n “${array1[$index]}”
((pwd_len++))
done
echo
exit 0