Hi geeks,
For the last two days, i am trying to configure A Loadbalanced Apache Cluster.
I have a virtual box, in which i installed 3 ubuntu 10.04 server machine
I did as following
System Name IP
Virtual IP evergreen 10.129.50.185
Load node 1: load1 10.129.50.182
Apache node1: Apache01 10.129.50.183
Apache node2: Apache02 10.129.50.184
1. Enable IPVS on load balancer.
echo ip_vs_dh >> /etc/modules
echo ip_vs_ftp >> /etc/modules
echo ip_vs >> /etc/modules
echo ip_vs_lblc >> /etc/modules
echo ip_vs_lblcr >> /etc/modules
echo ip_vs_lc >> /etc/modules
echo ip_vs_nq >> /etc/modules
echo ip_vs_rr >> /etc/modules
echo ip_vs_sed >> /etc/modules
echo ip_vs_sh >> /etc/modules
echo ip_vs_wlc >> /etc/modules
echo ip_vs_wrr >> /etc/modules
modprobe ip_vs_dh
modprobe ip_vs_ftp
modprobe ip_vs
modprobe ip_vs_lblc
modprobe ip_vs_lblcr
modprobe ip_vs_lc
modprobe ip_vs_nq
modprobe ip_vs_rr
modprobe ip_vs_sed
modprobe ip_vs_sh
modprobe ip_vs_wlc
modprobe ip_vs_wrr
2. Install ipvsadm and ldirectord ,heartbeat. Get perl-doc also in
order to read the ldirectord help pages.
apt-get install ipvsadm
apt-get install ldirectord
apt-get install perl-doc
apt-get install heartbeat
3. Enable packet forwarding on the load balancer in /etc/sysctl.conf.
Then load the new setting.
# Enables packet forwarding
net.ipv4.ip_forward = 1
sysctl -p
4. Configure ipvsadm. Running dpkg-reconfigure will create the two
files ipvsadm.rules and ipvsadm.
dpkg-reconfigure ipvsadm
Load on boot: No
Daemon method: none
/etc/ipvsadm.rules
# emtpy rules file for ipvsadm
/etc/default/ipvsadm
AUTO="false"
DAEMON="none"
5. Configure ldirectord.
/etc/ha.d/ldirectord.cf
checktimeout=10
checkinterval=2
autoreload=no
logfile="/var/log/ldirectord.log"
quiescent=yes
virtual=10.129.50.185:80
real=10.129.50.183:80 gate
real=10.129.50.184:80 gate
service=http
request="ldirector.html"
receive="Test Page"
scheduler=wlc
protocol=tcp
checktype=negotiate
virtual=10.129.50.185:443
real=10.129.50.183:443 gate
real=10.129.50.184:443 gate
service=http
request="ldirector.html"
receive="Test Page"
scheduler=wlc
protocol=tcp
checktype=negotiate
Point to this file in /etc/default/ldirectord
CONFIG_FILE=/etc/ha.d/ldirectord.cf
Status of ldirector:
ldirectord ldirectord.cf status
The actual output should like below
\1 better written as $1 at /usr/sbin/ldirectord line 1252.
\1 better written as $1 at /usr/sbin/ldirectord line 1252.
ldirectord for /etc/ha.d/ldirectord.cf is running with pid: 2629
but for me
\1 better written as $1 at /usr/sbin/ldirectord line 1252.
\1 better written as $1 at /usr/sbin/ldirectord line 1252.
ldirectord stopped for /etc/ha.d/ldirectord.cf
7. Start ldirectord.
/etc/init.d/ldirectord start
ipvsadm -L -n
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 10.129.50.185:80 wlc
-> 10.129.50.183:80 Route 1 0 0
-> 10.129.50.184:80 Route 1 0 0
TCP 10.129.50.185:443 wlc
-> 10.129.50.183:443 Route 0 0 0
-> 10.129.50.184:443 Route 0 0 0
The load balancer should list the virtual IP:
ip addr sh eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
link/ether 78:2b:cb:11:93:9c brd ff:ff:ff:ff:ff:ff
inet 10.129.50.182/16 brd 10.129.127.255 scope global eth0
8. Configure the apache nodes to accept requests on the virtual IP
10.129.50.185.
/etc/sysctl.conf
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.eth0.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.eth0.arp_announce = 2
Load the new settings:
sysctl -p
9. Configure /etc/ha.d/haresources (to start ldirectord from heartbeat).
load1 \
ldirectord::ldirectord.cf \
IPaddr2::10.129.50.185/16/eth0 \
10. Configure network interface for the virtual IP on the apache servers.
/etc/network/interfaces
# Load balancing virtual interface
auto lo:0
iface lo:0 inet static
address 10.129.50.185
netmask 255.255.0.0
pre-up sysctl -p > /dev/null
enable the interface:
ifup lo:0
Run ifconfig to verify interface is up:
lo:0 Link encap:Local Loopback
inet addr:10.129.50.185 Mask:255.255.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
11. Create /var/www/ldirector.html on the apache servers.
Test Page
12. Test.
Browse to 10.129.50.185 (virtual IP)
Everying done without error. But Virtual IP not displaying anything
and i can ping load balancer 10.129.50.182 but i can not ping
10.129.50.183 and 10.129.50.184 apache servers.
--
Cheers,
Dhastha
Project staff
Indian Institute of Technology, Bombay
My experience on Linux: http://dhastha.wordpress.com
Member of KanchiLUG : http://www.kanchilug.wordpress.com
OAOD : http://dowithlinux.wordpress.com
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