Floating ip address will be 192.168.121.179
Vagrantfile needed parameters:
config.vm.box = "centos/8"
config.vm.network "private_network", ip: "192.168.121.180"
config.vm.hostname = "lb01.localhost"
config.vm.box = "centos/8"
config.vm.network "private_network", ip: "192.168.121.181"
config.vm.hostname = "lb02.localhost"
config.vm.box = "centos/8"
config.vm.network "private_network", ip: "192.168.121.191"
config.vm.hostname = "app01.localhost"
config.vm.box = "centos/8"
config.vm.network "private_network", ip: "192.168.121.192"
config.vm.hostname = "app02.localhost"
------------------------------------------------------------------------
app01 and app02 will have nginx installed running its default welcome page.
angel@acool:~/Documents/haproxy-cluster$ date
Fri 21 May 2021 07:11:52 PM PDT
angel@acool:~/Documents/haproxy-cluster$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=20.04
DISTRIB_CODENAME=focal
DISTRIB_DESCRIPTION="Ubuntu 20.04.2 LTS"
angel@acool:~/Documents/haproxy-cluster$
angel@acool:~/Documents/haproxy-cluster$ tree
.
├── app01
│ └── Vagrantfile
├── app02
│ └── Vagrantfile
├── lb01
│ └── Vagrantfile
├── lb02
│ └── Vagrantfile
└── NOTES.txt
4 directories, 5 files
angel@acool:~/Documents/haproxy-cluster$
angel@acool:~/Documents/haproxy-cluster$ sudo vagrant global-status
id name provider state directory
------------------------------------------------------------------------------
1553a24 default libvirt shutoff /home/angel/Documents/haproxy-cluster/lb01
3c33424 default libvirt shutoff /home/angel/Documents/haproxy-cluster/lb02
1d9af06 default libvirt shutoff /home/angel/Documents/haproxy-cluster/app01
5bc8220 default libvirt shutoff /home/angel/Documents/haproxy-cluster/app02
...
angel@acool:~/Documents/haproxy-cluster$
angel@acool:~/Documents/haproxy-cluster$
angel@acool:~/Documents/haproxy-cluster/lb01$ vagrant --version
Vagrant 2.2.6
angel@acool:~/Documents/haproxy-cluster$
angel@acool:~/Documents/haproxy-cluster$ cd lb01/
angel@acool:~/Documents/haproxy-cluster/lb01$ sudo vagrant up
...
angel@acool:~/Documents/haproxy-cluster/lb01$ sudo vagrant ssh
Last login: Sat May 22 02:08:45 2021 from 192.168.121.1
[vagrant@lb01 ~]$
[vagrant@lb01 ~]$ cat /etc/redhat-release
CentOS Linux release 8.3.2011
[vagrant@lb01 ~]$ sudo dnf install haproxy keepalived
[vagrant@lb01 ~]$ haproxy -v
HA-Proxy version 1.8.23 2019/11/25
Copyright 2000-2019 Willy Tarreau <willy@haproxy.org>
[vagrant@lb01 ~]$ keepalived --version
Keepalived v2.0.10 (11/12,2018)
...
[vagrant@lb01 ~]$
[vagrant@lb01 ~]$ # HAProxy need this to bind to floating ip when ip is missing locally
[vagrant@lb01 ~]$ cat /etc/sysctl.conf
...
net.ipv4.ip_nonlocal_bind=1
[vagrant@lb01 ~]$
[vagrant@lb01 ~]$ sudo sysctl -p
net.ipv4.ip_nonlocal_bind = 1
[vagrant@lb01 ~]$
[vagrant@lb01 ~]$
[vagrant@lb01 ~]$ cat /etc/haproxy/haproxy.cfg
...
## enable stats
listen stats
bind :9000
stats enable
stats uri /stats
stats refresh 10s
stats admin if LOCALHOST
## enable www frontend, bind floating ip address
frontend www
bind 192.168.121.179:80
mode http
default_backend www_servers
## enable www backend
backend www_servers
balance roundrobin
option forwardfor
http-request set-header X-Forwarded-Port %[dst_port]
http-request add-header X-Forwarded-Proto https if { ssl_fc }
option httpchk HEAD / HTTP/1.1\r\nHost:localhost
server app01 192.168.121.191:80 check
server app02 192.168.121.192:80 check
[vagrant@lb01 ~]$
[vagrant@lb01 ~]$ cat /etc/keepalived/keepalived.conf
vrrp_script chk_haproxy { # Requires keepalived-1.1.13
#script "killall -0 haproxy" # cheaper than pidof
script "pidof haproxy" # this one worked better for me.
interval 2 # check every 2 seconds
weight 2 # add 2 points of priority if OK
}
vrrp_instance VI_1 {
interface eth0
state MASTER
virtual_router_id 51
priority 101 # 101 on lb01, 100 on lb02
virtual_ipaddress {
192.168.121.179
}
track_script {
chk_haproxy
}
}
[vagrant@lb01 ~]$
[vagrant@lb01 ~]$ # this should be the end result, the floating ip should be listed.
[vagrant@lb01 ~]$ ip a |grep 179
inet 192.168.121.179/32 scope global eth0
[vagrant@lb01 ~]$
[vagrant@lb01 ~]$ # if you stop haproxy (or shutdown lb01), lb02 should take over the floating ip!
[vagrant@lb01 ~]$ # when haproxy is back, lb01 will reclaim the floating ip, the end result is
[vagrant@lb01 ~]$ # the floating ip will be available even if lb01 goes down.
Cheers!
UPDATE: November 11, 2021 - Adding lb02 details in order to remove ambiguities when I see this post in the future.
[vagrant@lb02 ~]$ cat /etc/sysctl.conf
...
net.ipv4.ip_nonlocal_bind=1
[vagrant@lb02 ~]$
[vagrant@lb02 ~]$
[vagrant@lb02 ~]$
[vagrant@lb02 ~]$ cat /etc/keepalived/keepalived.conf
vrrp_script chk_haproxy { # Requires keepalived-1.1.13
#script "killall -0 haproxy" # cheaper than pidof
script "pidof haproxy"
interval 2 # check every 2 seconds
weight 2 # add 2 points of priority if OK
}
vrrp_instance VI_1 {
interface eth0
state MASTER
virtual_router_id 51
priority 100 # 101 on primary, 100 on secondary
virtual_ipaddress {
192.168.121.179
}
track_script {
chk_haproxy
}
}
[vagrant@lb02 ~]$
[vagrant@lb02 ~]$
[vagrant@lb02 ~]$
[vagrant@lb02 ~]$ cat /etc/haproxy/haproxy.cfg
#---------------------------------------------------------------------
# Example configuration for a possible web application. See the
# full configuration options online.
#
# https://www.haproxy.org/download/1.8/doc/configuration.txt
#
#---------------------------------------------------------------------
#---------------------------------------------------------------------
# Global settings
#---------------------------------------------------------------------
global
# to have these messages end up in /var/log/haproxy.log you will
# need to:
#
# 1) configure syslog to accept network log events. This is done
# by adding the '-r' option to the SYSLOGD_OPTIONS in
# /etc/sysconfig/syslog
#
# 2) configure local2 events to go to the /var/log/haproxy.log
# file. A line like the following can be added to
# /etc/sysconfig/syslog
#
# local2.* /var/log/haproxy.log
#
log 127.0.0.1 local2
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 4000
user haproxy
group haproxy
daemon
# turn on stats unix socket
stats socket /var/lib/haproxy/stats
# utilize system-wide crypto-policies
ssl-default-bind-ciphers PROFILE=SYSTEM
ssl-default-server-ciphers PROFILE=SYSTEM
#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
#---------------------------------------------------------------------
defaults
mode http
log global
option httplog
option dontlognull
option http-server-close
option forwardfor except 127.0.0.0/8
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout http-keep-alive 10s
timeout check 10s
maxconn 3000
# ME: enable stats
listen stats
bind :9000
stats enable
stats uri /stats
stats refresh 10s
stats admin if LOCALHOST
# ME:
frontend www
bind 192.168.121.179:80
mode http
default_backend www_servers
# ME:
backend www_servers
balance roundrobin
option forwardfor
http-request set-header X-Forwarded-Port %[dst_port]
http-request add-header X-Forwarded-Proto https if { ssl_fc }
option httpchk HEAD / HTTP/1.1\r\nHost:localhost
server app01 192.168.121.191:80 check
server app02 192.168.121.192:80 check
#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------
frontend main
bind *:5000
acl url_static path_beg -i /static /images /javascript /stylesheets
acl url_static path_end -i .jpg .gif .png .css .js
use_backend static if url_static
default_backend app
#---------------------------------------------------------------------
# static backend for serving up images, stylesheets and such
#---------------------------------------------------------------------
backend static
balance roundrobin
server static 127.0.0.1:4331 check
#---------------------------------------------------------------------
# round robin balancing between the various backends
#---------------------------------------------------------------------
backend app
balance roundrobin
server app1 127.0.0.1:5001 check
server app2 127.0.0.1:5002 check
server app3 127.0.0.1:5003 check
server app4 127.0.0.1:5004 check
[vagrant@lb02 ~]$
[vagrant@lb02 ~]$
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