How to create bridge on top of bonding in linux?

I have created following scripts :

------------
/etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0
NM_CONTROLLED=no
BOOTPROTO=none
ONBOOT=yes
MASTER=bond0
SLAVE=yes
TYPE=Ethernet
IPV6INIT=no
USERCTL=no

---------------

/etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth1
NM_CONTROLLED=no
BOOTPROTO=none
ONBOOT=yes
MASTER=bond0
SLAVE=yes
TYPE=Ethernet
IPV6INIT=no
USERCTL=no

--------------

/etc/sysconfig/network-scripts/ifcfg-bond0

DEVICE=bond0
ONBOOT=yes
BOOTPROTO=none
USERCTL=no
IPV6INIT=no
BONDING_OPTS="mode=1 miimon=100 updelay=200 downdelay=200 primary=eth0"
BRIDGE=br0

-------------

/etc/sysconfig/network-scripts/ifcfg-br0

DEVICE=br0
TYPE=Bridge
BOOTPROTO=none
IPADDR=10.XXX.XXX.X7
NETMASK=255.255.255.XXX
GATEWAY=10.XXX.XXX.XXX
ONBOOT=yes
DELAY=0
IPV6INIT=no
-------------

Also add alias of bonding in modprobe.conf like :

# vi /etc/modprobe.conf

alias bond0 bonding

Restart network service :

# service network restart

That's it.

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How to start apache uisng worker MPM?

1. Check which MPM is running currently :

/usr/sbin/apachectl -l

If you see worker.c in the list of loaded modules, your Apache is running Worker MPM. If prefork.c, it is running prefork.

2. To determine if apache has Worker MPM compiled in:

/usr/sbin/httpd.worker -l

If you see worker.c in the list of compiled-in modules, Apache can run Worker MPM.

3. Un-Comment HTTPD=/usr/sbin/httpd.worker in /etc/sysconfig/httpd
4. service httpd restart

Note : Please recompile php with thread-safe option(php still doesn't support worker MPM. You need mod_fcgid ), else it will throw error.

In order to temporary disable php, locate php

$locate php.conf

Then comment the php module and options. Then start apache.

Check again $/usr/sbin/apachectl -l

In order to compile mod_fcgid with worker MPM to be running php page, please refer following link :

http://www.lifelinux.com/installing-apache-with-worker-mpm-and-php-fastcgi/

Disclaimer : I have mentioned above link to help you on it. Note that I am not owner of this site or don't have privileges to edit this article. So, use it at your own risk.

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How to create reverse DNS record in bind?

How to create reverse DNS record in bind :

Used Environment : RHEL 6

Steps followed :

1. Add following lines in /etc/named.conf :

---------
zone "0.168.192.in-addr.arpa" IN {
type master;
file "0.168.192.in-addr.arpa";
allow-update { none; };
};
---------

2. Create zone for this reverse record :

-------------------
$cat /var/named/0.168.192.in-addr.arpa

$TTL 600
@ IN SOA ns1.example.com. host.example.com. (
2012013001 ;Serial Number
86400 ;refresh
7200 ;retry
3600000 ;expire
86400 ;minimum

)

0.168.192.in-addr.arpa. IN NS ns1.example.com.
0.168.192.in-addr.arpa. IN NS ns2.example.com.
201 IN PTR example.com.
------------------

Testing :

-----------------------
$dig -x 192.168.0.201 @localhost

; <<>> DiG 9.7.3-P3-RedHat-9.7.3-8.P3.el6_2.2 <<>> -x 192.168.0.201 @localhost
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 17992
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2

;; QUESTION SECTION:
;201.0.168.192.in-addr.arpa. IN PTR

;; ANSWER SECTION:
201.0.168.192.in-addr.arpa. 600 IN PTR example.com.

;; AUTHORITY SECTION:
0.168.192.in-addr.arpa. 600 IN NS ns2.example.com.
0.168.192.in-addr.arpa. 600 IN NS ns1.example.com.

;; ADDITIONAL SECTION:
ns1.example.com. 86400 IN A 192.168.0.201
ns2.example.com. 86400 IN A 192.168.40.34

;; Query time: 0 msec
;; SERVER: ::1#53(::1)
;; WHEN: Wed Feb 22 15:00:32 2012
;; MSG SIZE rcvd: 137
---------------------------

DB of the zone example.com looks like :

--------------
$cat example.com
$TTL 24h

;
; zone data file
; comments can appear on any line after a semi-colon
;
example.com. IN SOA ns1.example.com. root.mail.example.com. (
2012013001 ; last updated January 30th,2012, once
24h
2h
4w
4d )

example.com. IN NS ns1.example.com.
example.com. IN NS ns2.example.com.
example.com. IN A 192.168.0.201
mail.example.com. IN A 192.168.0.201
ns1.example.com. IN A 192.168.0.201
ns2.example.com. IN A 192.168.40.34
www.example.com. IN CNAME example.com.
wwww.example.com. IN CNAME example.com.
ww.example.com. IN CNAME example.com.
example.com. IN MX 0 mail.example.com.

--------------

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