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Deploying NEX in a HA scenario


HA is the High Availability scenario which means that a IT system, component, or application can able to operate at a high level, continuously, without intervention for an anticipated time. The sole purpose of the High-availability infrastructure is to deliver quality performance, handle various kinds of loads and failure with minimal or zero downtime.


To deploy NEX in Peerplays with High-availability, minimum 4 servers are required,
  • 2 Backend Servers for NEX
  • 1 Main HA proxy server
  • 1 Backup HA proxy server

Steps to setup HA scenario

It is recommended to use HA proxy to setup a highly available scenario. Click the link below to learn about the step-by-step procedure to configure HA


The below code uses the SSL passthrough for end to end encryption. The SSL certificates are passed onto both backend servers (server1, server 2).
log /dev/log local0
log /dev/log local1 notice
chroot /var/lib/haproxy
stats socket /run/haproxy/admin.sock mode 660 level admin expose-fd listeners
stats timeout 30s
user haproxy
group haproxy
# Default SSL material locations
ca-base /etc/ssl/certs
crt-base /etc/ssl/private
# See:
ssl-default-bind-ciphersuites TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256
ssl-default-bind-options ssl-min-ver TLSv1.2 no-tls-tickets
log global
mode http
option dontlognull
timeout connect 5000
timeout client 50000
timeout server 50000
errorfile 400 /etc/haproxy/errors/400.http
errorfile 403 /etc/haproxy/errors/403.http
errorfile 408 /etc/haproxy/errors/408.http
errorfile 500 /etc/haproxy/errors/500.http
errorfile 502 /etc/haproxy/errors/502.http
errorfile 503 /etc/haproxy/errors/503.http
errorfile 504 /etc/haproxy/errors/504.http
listen stats
bind *:8080 # Defines the IP and port for the stats page
mode http
stats enable
stats hide-version
stats realm Haproxy\ Statistics
stats uri /stats # The URL for the stats page
stats auth <your-username>:<your-password> # Use the respective username and password of the node in use
frontend https_front
bind *:443
mode tcp
default_backend https_back
backend https_back
mode tcp
option tcp-check
tcp-check connect port 3000
server server1 x.x.x.x:443 check fall 1
server server2 x.x.x.x:443 check backup fall 1
There are several methods to deploy high availability node application with HA proxy. Below are the links to check the various configurations,