LoadBalancing avec KeepAlived LVS

# vi /etc/sysctl.conf

# Useful for LVS loadbalancing on the same network
net.ipv4.conf.all.arp_ignore=1
net.ipv4.conf.all.arp_announce=2
net.ipv4.conf.eth0.arp_ignore=1
net.ipv4.conf.eth0.arp_announce=2

* Debian

# vi /etc/network/interfaces

auto tunl0
iface tunl0 inet static
    address 192.168.1.99 (<<< nouvelle vip créée)
    netmask 255.255.255.255
    broascast 192.168.1.255

# ifup tunl0

* Red-Hat

# vi /etc/sysconfig/network-scripts/ifcfg-tunl0

DEVICE=tunl0
IPADDR=192.168.1.99
NETMASK=255.255.255.255
BROADCAST=192.168.1.255
ONBOOT=yes
TYPE=IPIP

# ifup tunl0

# ifconfig tunl0
tunl0 Link encap:IPIP Tunnel HWaddr 
inet addr:192.168.1.99 Mask:255.255.255.255
UP RUNNING NOARP MTU:1480 Metric:1
RX packets:273 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0 
RX bytes:11328 (11.0 KiB) TX bytes:0 (0.0 b)

# vi /etc/sysctl.conf

# for LVS tun
net.ipv4.ip_forward=1

# apt-get install keepalived

Ceci et le fichier de configuration du serveur LVS_1 (server MASTER) le serveur LVS_2 à le même fichier de configuration hormis "state MASTER" à changer par "state BACKUP"

# cat /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
 notification_email {
 postmaster@your-domain
 }
 notification_email_from postmaster@your-domain
 smtp_server 127.0.0.1
 smtp_connect_timeout 30
 router_id LVS_XXX
}

vrrp_sync_group VG1 {
 group {
 VI_1
 }
}

vrrp_instance VI_1 {
 state MASTER
 interface eth0
 garp_master_delay 10
 smtp_alert
 virtual_router_id 51
 priority 100
 advert_int 1
 authentication {
 auth_type PASS
 auth_pass 1111
 }
 virtual_ipaddress {
 192.168.1.99
 }
}

virtual_server 192.168.1.99 80 {
 delay_loop 6
 lb_algo rr
 lb_kind TUN
 persistence_timeout 600
 protocol TCP

 real_server 192.168.1.2 80 {
 weight 100
 TCP_CHECK {
 connect_port 80
 connect_timeout 3
 }
 }
 real_server 192.168.1.3 80 {
 weight 100
 TCP_CHECK {
 connect_port 80
 connect_timeout 3
 }
 }
}

# ipvsadm -l
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
 -> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.1.99:www rr persistent 600
 -> 192.168.1.2:www Tunnel 100 0 0
 -> 192.168.1.3:www Tunnel 100 0 0

# ipvsadm -Ln --stats
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port               Conns   InPkts  OutPkts  InBytes OutBytes
  -> RemoteAddress:Port
TCP  192.168.1.99:80                     0        0        0        0        0
  -> 192.168.1.2:80                      0        0        0        0        0
  -> 192.168.1.3:80                      0        0        0        0        0