HAProxy &Keepalived
For configuring HA-Load balancer, You need 2 virtual/physical servers
for the load-balancers and 2 virtual/physical servers to load-balance. In
addition to the 4 IP addresses needed by the servers themselves, a fifth
virtual IP address (VIP) is necessary. The two load-balancers and the VIP need
to be in the same network segment.
HAProxy and keepalived. So, HAProxy will
be used as load-balancing software, keepalived as high
availability solution and apache as software to load-balance.
Load Balancer 1: haproxy1.psi.com, IP
address: 192.168.0.25
Load Balancer 2: haproxy2.psi.com, IP
address: 192.168.0.26
MGMT Server 1: mgmt1.psi.com, IP
address: 192.168.0.21
MGMT Server 2: mgmt1.psi.com, IP
address: 192.168.0.22
We also need a virtual IP address that floats
between lb1 and lb2: 192.168.0.31
Here's a little diagram that shows our setup:
shared IP=192.168.0.31
192.168.0.25 192.168.0.26 192.168.0.21 192.168.0.22
-------+---------
---+--------------+-----------+-----------------+--------- ---+--------------+
|
| |
| | | |
+--+--+ +--+--+ +----+----+ +----+----+
+----+----+ +----+----+ +----+----+ +----+--
| lb1 | | lb2 |
| http1 |
| http2 |
+-----++-----+ +---------+ +---------+ +---------+ +---------+ +---------+ +---------+
haproxy
haproxy
2 MGMT servers (Apache)
keepalived keepalived
HAProxy Configuration on server 1
HaProxy configuration-
#Yum install haproxy
Copy the below configuration file below defaults
and change the portnumber,name of the server& server ip by requirements
vi /etc/haproxy/haproxy.conf
listen cloudstack_ui_443(Port
https-443,Http-8080)
bind *:443
mode http
balance
source
server mgmt1.psi.com 192.168.0.21:443 cookie A
check(Server name&IP address)
server mgmt2.psi.com 192.168.0.22:443 cookie B
check(Server name&IP address)
listen cloudstack_systemvm_8250(System VM-Mgmt server port port)
bind
*:8250
mode
tcp
balance
source
server mgmt1.psi.com 192.168.0.21:8250 maxconn
32 check (Servername&IP address)
server mgmt2.psi.com 192.168.0.22:8250 maxconn
32 check (Servername&IP address)
Keepalived configuration on server 1(used
for virtual ip creation)
#Yum install keepalived
•
cp
/etc/keepalived/keepalived.conf
/etc/keepalived/keepalived.conf.orig(Copy original file and keep it as a
backup)
•
Open vi editor and copy below
content in to configuration file(192.168.0.31 virtual ip)
vi /etc/keepalived/keepalived.conf
vrrp_script chk_haproxy {
script "killall -0 haproxy" # check the haproxy process
interval 2 # every 2 seconds
weight 2 # add 2 points if OK
}
vrrp_instance VI_1 {
interface eth0 # interface to monitor
state MASTER # MASTER on haproxy1, BACKUP on haproxy2
virtual_router_id 77
priority 200 # 101 on haproxy1, 100 on haproxy2
virtual_ipaddress {
192.168.0.31 #dev eth0 # virtual ip address
}
track_script {
chk_haproxy
}
}
HAProxy Configuration on server 2
HaProxy configuration-
#Yum install haproxy
Copy the below configuration file below defaults
and change the portnumber,name of the server& server ip by requirements
vi /etc/haproxy/haproxy.conf
listen cloudstack_ui_443(Port
https-443,Http-8080)
bind *:443
mode http
balance
source
server mgmt1.psi.com 192.168.0.21:443 cookie A
check(Server name&IP address)
server mgmt2.psi.com 192.168.0.22:443 cookie B
check(Server name&IP address)
listen cloudstack_systemvm_8250(System VM-Mgmt server port port)
bind
*:8250
mode
tcp
balance
source
server mgmt1.psi.com 192.168.0.21:8250 maxconn
32 check (Servername&IP address)
server mgmt2.psi.com 192.168.0.22:8250 maxconn
32 check (Servername&IP address)
To check keep alive status: ip addr | grep eth0
Keepalived configuration on server 2(used
for virtual ip creation)
#Yum install keepalived
•
cp
/etc/keepalived/keepalived.conf
/etc/keepalived/keepalived.conf.orig(Copy original file and keep it as a
backup)
•
Open vi editor and copy below
content in to configuration file(192.168.0.31 virtual ip)
vi /etc/keepalived/keepalived.conf
vrrp_script chk_haproxy {
script "killall -0 haproxy" # check the haproxy process
interval 2 # every 2 seconds
weight 2 # add 2 points if OK
}
vrrp_instance VI_1 {
interface eth0 # interface to monitor
state MASTER # MASTER on haproxy1, BACKUP on haproxy2
virtual_router_id 77
priority 111 # 101 on haproxy1, 100 on haproxy2
virtual_ipaddress
{
192.168.0.31 #dev eth0 # virtual ip address
}
track_script {
chk_haproxy
}
}
To check keep alive status: ip addr | grep eth0
