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.
Requirements
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
Example
The below code uses the SSL passthrough for end to end encryption. The SSL certificates are passed onto both backend servers (server1, server 2).
global
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
daemon
# Default SSL material locations
ca-base /etc/ssl/certs
crt-base /etc/ssl/private
# See: https://ssl-config.mozilla.org/#server=haproxy&server-version=2.0.3&config=intermediate
ssl-default-bind-ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384
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
defaults
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,
