[HOWTO] Instalacija i konfiguracija LVS (Linux Virtual Server)
1. Instalacija CentOS Linux-a na serverima
- Podešavanje servera
2. Instalacija LVS managera
- Instalacija LVS managera
- Kreiranje konfiguracije
- Dodavanje servisa u startup
3. Demonstracija
- Startovanje LVS managera
- Monitoring LVS-a
- Otkazivanje jednog od web servera
- Vraćanje web servera u konfiguraciju
4. Pitanja, predlozi, ispravke?
1. Instalacija CentOS Linux-a na serverima
Ugasite SELinux (www1, www2, lvs)
sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
Potrebno je uključiti IP forwarding (lvs)
sed -i 's/net.ipv4.ip_forward = 0/net.ipv4.ip_forward = 1/g' /etc/sysctl.conf
Potrebno je ugasiti ARP zahteve (www1, www2)
echo "net.ipv4.conf.all.arp_ignore = 1" >> /etc/sysctl.conf
echo "net.ipv4.conf.all.arp_announce = 2" >> /etc/sysctl.conf
echo "net.ipv4.conf.eth0.arp_ignore = 1" >> /etc/sysctl.conf
echo "net.ipv4.conf.eth0.arp_announce = 2" >> /etc/sysctl.conf
Podesite /etc/hosts fajl (www1, www2, lvs)
echo "192.168.0.110 lvs.example.com" >> /etc/hosts
echo "192.168.0.111 www1.example.com" >> /etc/hosts
echo "192.168.0.112 www2.example.com" >> /etc/hosts
echo "192.168.0.222 www.example.com" >> /etc/hosts
Dodavanje virtuelne IP adrese (lvs)
echo "ifconfig eth0:0 192.168.0.222 netmask 255.255.255.0" >> /etc/rc.local
Dodavanje virtuelne IP adrese (www1, www2)
echo "ifconfig lo:0 192.168.0.222 netmask 255.255.255.255" >> /etc/rc.local
Ugasite nepotrebne servise (www1, www2, lvs)
chkconfig iptables off
chkconfig ip6tables off
Potrebno je instalirati Apache i PHP (www1, www2)
yum install httpd mod_php
chkconfig httpd on
Napravite fajl /var/www/html/index.php (www1, www2)
<?php echo "You are now on <strong>" . exec('hostname') . "</strong>"; ?>
Nakon toga restartujte servere (www1, www2, lvs)
reboot
2. Instalacija LVS managera (lvs)
Instalacija LVS managera
wget http://default.rs/~mstrugarevic/ldirectord-3.0.10-1.fc13.i686.rpm
yum localinstall ldirectord-3.0.10-1.fc13.i686.rpm
Kreiranje konfiguracije /etc/ha.d/ldirectord.cf
checktimeout=10
checkinterval=2
autoreload=yes
logfile="/var/log/ldirectord.log"
quiescent=yes
virtual=192.168.0.222:80
real=192.168.0.111:80 gate 1
real=192.168.0.112:80 gate 1
checktype=negotiate
service=http
request="test.html"
receive="OK"
scheduler=rr
protocol=tcp
Kreiranje test.html fajlova (www1, www2)
echo "OK" > /var/www/html/test.html
Dodavanje potrebnih LVS servisa
chkconfig ldirectord on
3. Demonstracija
Startovanje LVS managera
service ldirectord start
Monitoring LVS servisa
watch ipvsadm -L -n
Otkazivanje jednog od web servera
service httpd stop
Vraćanje web servera u konfiguraciju
service httpd start
4. Pitanja, predlozi, ispravke?
