LAB16: HA Proxy Load Balancer

LAB 41: HA Proxy Load balancer

Your final architecture will be:

Client → HAProxy (Public IP) → NodePorts → Ingress Controller → Services → Pods

STEP 1 — Install HAProxy on Your LB VM

sudo apt update
sudo apt install -y haproxy

Check version:

haproxy -v

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STEP 2 — Create HAProxy Config for Multiple Ingress Hosts

We’ll support two domains:

• fileshare.local → nginx ingress

Open HAProxy config:

sudo nano /etc/haproxy/haproxy.cfg

Replace with:

global
    log /dev/log local0
    maxconn 2048

defaults
    log global
    mode http
    option httplog
    timeout connect 5s
    timeout client  50s
    timeout server  50s

# FRONTEND: receives all HTTP traffic
frontend http_front
    bind *:80

    # Map by Host header
    acl host_fileshare hdr(host) -i fileshare.local

    use_backend nginx_ingress if host_fileshare


    # Default (if host doesn't match)
    default_backend nginx_ingress

# BACKEND: NGINX ingress (NodePort 32252)
backend nginx_ingress
    balance roundrobin
    mode http
    server node_master   3.239.117.77:32252 check
    server node_worker1  35.171.244.121:32252 check
    server node_worker2  44.197.102.217:32252 check

Save & exit.

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STEP 3 — Restart HAProxy

sudo systemctl restart haproxy
sudo systemctl enable haproxy
sudo systemctl status haproxy

Expected:

Active: active (running)

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STEP 5 — Add Local DNS Entries

On your laptop/workstation:

<HAProxy_PUBLIC_IP>  fileshare.local
<HAProxy_PUBLIC_IP>  fileshare-traefik.local

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STEP 6 — Test NGINX Ingress

curl -I -H "Host: fileshare.local" http://34.239.175.190/

Expected: HTTP/1.1 200 OK

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OPTIONAL — Load Balance MySQL, Redis, Postgres, etc.

To balance MySQL port 3306:

frontend mysql_front
    bind *:3306
    mode tcp
    default_backend mysql_back

backend mysql_back
    mode tcp
    balance roundrobin
    server db1 3.239.117.77:3306 check
    server db2 35.171.244.121:3306 check
    server db3 44.197.102.217:3306 check

HAProxy is both:

• L7 Reverse Proxy (HTTP/TLS)

• L4 Network Load Balancer (TCP)