HAProxy nodesHAProxy is a very fast and reliable solution offering high availability, load balancing, and proxying
for TCP and HTTP-based applications. It is particularly suited for web sites crawling under very high loads
while needing persistence or Layer 7 processing. Supporting tens of thousands of connections is clearly
realistic with today’s hardware.For installing HAProxy on your nodes, you should consider its official documentation.
Also, you have to consider that this service should not be a single point of failure, so you need at least two
nodes running HAProxy.Here is an example for HAProxy configuration file:global
chroot /var/lib/haproxy
daemon
group haproxy
maxconn 4000
pidfile /var/run/haproxy.pid
user haproxy
defaults
log global
maxconn 8000
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout check 10s
listen dashboard_cluster
bind <Virtual IP>:443
balance source
option tcpka
option httpchk
option tcplog
server controller1 10.0.0.1:443 check inter 2000 rise 2 fall 5
server controller2 10.0.0.2:443 check inter 2000 rise 2 fall 5
listen galera_cluster
bind <Virtual IP>:3306
balance source
option httpchk
server controller1 10.0.0.4:3306 check port 9200 inter 2000 rise 2 fall 5
server controller2 10.0.0.5:3306 check port 9200 inter 2000 rise 2 fall 5
server controller3 10.0.0.6:3306 check port 9200 inter 2000 rise 2 fall 5
listen glance_api_cluster
bind <Virtual IP>:9292
balance source
option tcpka
option httpchk
option tcplog
server controller1 10.0.0.1:9292 check inter 2000 rise 2 fall 5
server controller2 10.0.0.2:9292 check inter 2000 rise 2 fall 5
listen glance_registry_cluster
bind <Virtual IP>:9191
balance source
option tcpka
option tcplog
server controller1 10.0.0.1:9191 check inter 2000 rise 2 fall 5
server controller2 10.0.0.2:9191 check inter 2000 rise 2 fall 5
listen keystone_admin_cluster
bind <Virtual IP>:35357
balance source
option tcpka
option httpchk
option tcplog
server controller1 10.0.0.1:35357 check inter 2000 rise 2 fall 5
server controller2 10.0.0.2.42:35357 check inter 2000 rise 2 fall 5
listen keystone_public_internal_cluster
bind <Virtual IP>:5000
balance source
option tcpka
option httpchk
option tcplog
server controller1 10.0.0.1:5000 check inter 2000 rise 2 fall 5
server controller2 10.0.0.2:5000 check inter 2000 rise 2 fall 5
listen nova_ec2_api_cluster
bind <Virtual IP>:8773
balance source
option tcpka
option tcplog
server controller1 10.0.0.1:8773 check inter 2000 rise 2 fall 5
server controller2 10.0.0.2:8773 check inter 2000 rise 2 fall 5
listen nova_compute_api_cluster
bind <Virtual IP>:8774
balance source
option tcpka
option httpchk
option tcplog
server controller1 10.0.0.1:8774 check inter 2000 rise 2 fall 5
server controller2 10.0.0.2:8774 check inter 2000 rise 2 fall 5
listen nova_metadata_api_cluster
bind <Virtual IP>:8775
balance source
option tcpka
option tcplog
server controller1 10.0.0.1:8775 check inter 2000 rise 2 fall 5
server controller2 10.0.0.2:8775 check inter 2000 rise 2 fall 5
listen cinder_api_cluster
bind <Virtual IP>:8776
balance source
option tcpka
option httpchk
option tcplog
server controller1 10.0.0.1:8776 check inter 2000 rise 2 fall 5
server controller2 10.0.0.2:8776 check inter 2000 rise 2 fall 5
listen ceilometer_api_cluster
bind <Virtual IP>:8777
balance source
option tcpka
option httpchk
option tcplog
server controller1 10.0.0.1:8774 check inter 2000 rise 2 fall 5
server controller2 10.0.0.2:8774 check inter 2000 rise 2 fall 5
listen spice_cluster
bind <Virtual IP>:6082
balance source
option tcpka
option tcplog
server controller1 10.0.0.1:6080 check inter 2000 rise 2 fall 5
server controller2 10.0.0.2:6080 check inter 2000 rise 2 fall 5
listen neutron_api_cluster
bind <Virtual IP>:9696
balance source
option tcpka
option httpchk
option tcplog
server controller1 10.0.0.1:9696 check inter 2000 rise 2 fall 5
server controller2 10.0.0.2:9696 check inter 2000 rise 2 fall 5
listen swift_proxy_cluster
bind <Virtual IP>:8080
balance source
option tcplog
option tcpka
server controller1 10.0.0.1:8080 check inter 2000 rise 2 fall 5
server controller2 10.0.0.2:8080 check inter 2000 rise 2 fall 5After each change of this file, you should restart HAProxy.