Howto: Set Up A Loadbalanced High-Availability Apache Cluster

[PeterBiggerstaff]

Hi All,

This question is about: http://www.howtoforge.com/high_avail...apache_cluster


First off, I have to say this is a fantastic howto! I realize that "high availability" and clustering is an very complex process, yet this howto has done an excellent job of compressing it down to a "n00bs guide"

Everything went well (I have 2 load balancers, with active fail over, works perfectly, except the last step..

The howto is for Debian, but the project I am working on is Fedora based.

The howto says to do this on the webservers:

vi /etc/network/interfaces
auto lo:0
iface lo:0 inet static
address 192.168.0.105
netmask 255.255.255.255
pre-up sysctl -p > /dev/null

But Redhat/Fedora does not use /etc/network/interfaces it uses
/etc/sysconfig/network-scripts/ifcfg-eth*

I have tried putting this in /etc/sysconfig/network-scripts/ifcfg-lo:0

DEVICE=eth0 (I've also tried commenting this out, or using lo:0)
BOOTPROTO=static
BROADCAST=192.168.19.255
HWADDR=00:0C:29:58:10:00 (again I've tried commenting this out)
IPADDR=192.168.19.20 (the virtual IP address)
IPV6ADDR=
IPV6PREFIX=
NETMASK=255.255.255.0
NETWORK=192.168.19.0
ONBOOT=yes

but doing that just breaks all network connectivity...

Does anyone have any ideas?

[PeterBiggerstaff]

found this on the ultra monkey site:

The file /etc/sysconfig/network-scripts/ifcfg-lo:0 configures the lo:0 interface, an example follows:

To bring up the IP alias the ifup command is used:

/sbin/ifup lo

[PeterBiggerstaff]

even with the alias added.. it still won't work.

I can ping the virtual IP address... but its not routing port 80 thru to the webservers!

anyone?

[johN5Five^]

i also hving a same problem like u...
i make apache webserver and mysql cluster with load balancing..but i also facing the same problem..
i m using Ubuntu 5.10

after i add this to the interfaces ...and i ifup lo:0

vi /etc/network/interfaces

auto lo:0
iface lo:0 inet static
address 10.100.100.105
netmask 255.255.255.0
pre-up sysctl -p > /dev/null

The virtual ip still exist..but mysql cluster connection to mgm node lost...and connection to internet also lost...

b4 i ifup , everything works fine..mysql cluster node all fine..
and i think is something wrong with the interfaces file..

vi /etc/network/interfaces
auto lo:0
iface lo:0 inet static
address 192.168.0.105
netmask 255.255.255.255
pre-up sysctl -p > /dev/null

y the netmask is 255.255.255.255 ????
what is the meaning of pre-up sysctl -p > /dev/null ???

plz help us ..

[falko]

Originally Posted by PeterBiggerstaff

The howto is for Debian, but the project I am working on is Fedora based.

Unfortunately I don't know how the syntax should be in the /etc/sysconfig/network-scripts/ifcfg-lo:0 file...

[falko]

Originally Posted by johN5Five^

i also hving a same problem like u...
i make apache webserver and mysql cluster with load balancing..but i also facing the same problem..
i m using Ubuntu 5.10

after i add this to the interfaces ...and i ifup lo:0

vi /etc/network/interfaces

auto lo:0
iface lo:0 inet static
address 10.100.100.105
netmask 255.255.255.0
pre-up sysctl -p > /dev/null

The virtual ip still exist..but mysql cluster connection to mgm node lost...and connection to internet also lost...

b4 i ifup , everything works fine..mysql cluster node all fine..
and i think is something wrong with the interfaces file..



y the netmask is 255.255.255.255 ????
what is the meaning of pre-up sysctl -p > /dev/null ???

plz help us ..

Can you post your /etc/network/interfaces file? Please wrap it in CODE tags so that I can see if leading spaces are correct in your file.

[johN5Five^]

This is my sql1 and sql2 interface file..which's the ip is 10.100.100.102 (sql1) and 10.100.100.103 (sql2).

All my 4 pc is throught a hub and go to a DNS.

#vi /etc/network/interfaces

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# This is a list of hotpluggable network interfaces.
# They will be activated automatically by the hotplug subsystem.
mapping hotplug
	script grep
	map eth0

# The primary network interface
iface eth0 inet static
address 10.100.100.102
netmask 255.0.0.0
gateway 10.100.100.1

 auto eth0


 auto lo:0	
 iface lo:0 inet static
 address 10.100.100.105
 netmask 255.0.0.0
 gateway 10.100.100.1
 pre-up sysctl -p > /dev/null

This is my etc/network/interfaces file.

i dont understand is the netmask of the virtual ip, what should it be??and the 'pre-up sysctl -p > /dev/null' ...
is there anything i set wrong ..plz correct me..thx..

[falko]

It must be like this:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# This is a list of hotpluggable network interfaces.
# They will be activated automatically by the hotplug subsystem.
mapping hotplug
	script grep
	map eth0

# The primary network interface
iface eth0 inet static
	address 10.100.100.102
	netmask 255.0.0.0
	gateway 10.100.100.1

 auto eth0


auto lo:0	
iface lo:0 inet static
	address 10.100.100.105
	netmask 255.0.0.0
	gateway 10.100.100.1

pre-up sysctl -p > /dev/null

Take care about the leading spaces!