Added all files

examples/018_site_yml/loadbalancer.yml

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+---
+- hosts: loadbalancer
+  become: true
+  roles:
+    - nginx
+    - haproxy
+    - keepalived
+  vars:
+    nginx_http_port: 80
+    nginx_https_port: 443
+    nginx_http2: true
+    nginx_ssl_certificate: "/etc/ssl/certs/ssl-cert-snakeoil.pem"
+    nginx_ssl_certificate_key: "/etc/ssl/private/ssl-cert-snakeoil.key"
+    haproxy_frontend_port: 80
+    haproxy_backend_servers:
+      - { name: "web1", address: "0.0.0.0", port: 80 }
+    keepalived_vrrp_id: 51
+    keepalived_vrrp_priority: 100
+    keepalived_vrrp_auth_pass: "password"
+    keepalived_vrrp_virtual_ip: ""  # Set this to the virtual IP you want to use
+    keepalived_vrrp_state: "MASTER"  # Set to "BACKUP" for the secondary load balancer
+    keepalived_vrrp_interface: "eth0"  # Change to your network interface
+    keepalived_vrrp_virtual_router_id: 51 # Must match the ID used by the other load balancer
+    keepalived_vrrp_unicast_peer: []  # Add IPs of other load balancers if needed
+    keepalived_vrrp_unicast_src_ip: ""  # Set to the source IP for unicast communication
+    keepalived_vrrp_track_script: "check_haproxy"
+    keepalived_vrrp_script_name: "check_haproxy"
+