docker-compose up
When making changes to the files the images need to be rebuild:
docker-compose build
or for a specific image for example the load balancer (lb)
docker-compose build lb
Based on the comments in aspnet/SignalR#2002 it is stated that when scaling an application that uses signalR it is necessary to configure:
- Sticky sessions on the load balancer
- Redis (or other storage) for the backplane
To enable sticky sessions on the load balancer copy this in the haproxy.cfg file:
# this config needs haproxy-1.1.28 or haproxy-1.2.1
global
log 127.0.0.1 local0
log 127.0.0.1 local1 notice
maxconn 4096
uid 99
gid 99
daemon
defaults
log global
mode http
option httplog
option dontlognull
retries 3
option redispatch
option http-server-close
maxconn 2000
timeout connect 5000
timeout client 50000
timeout server 50000
frontend public
bind *:80
default_backend api
backend api
timeout server 30s
balance roundrobin
cookie SERVERID insert indirect nocache
server s1 webapp1 cookie s1
server s2 webapp2 cookie s2
Then rebuild the load balancer image and run.
Select the appropreate connection in file site.js located in the wwwoot folder of the Api project.
// Use this connection when not using sticky sessions
var connection = new signalR.HubConnectionBuilder().withUrl("/socket", {
skipNegotiation: true,
transport: signalR.HttpTransportType.WebSockets
}).build();
// Use this connection when using sticky sessions
//var connection = new signalR.HubConnectionBuilder().withUrl("/socket").build();
It is possible to work without sticky sessions however the restriction is that for the websockets only the websocket protocol can be used. So long polling and other fall backs are not possible.
To disable sticky sessions in the load balancer, copy this in the haproxy.cfg file:
# this config needs haproxy-1.1.28 or haproxy-1.2.1
global
log 127.0.0.1 local0
log 127.0.0.1 local1 notice
maxconn 4096
uid 99
gid 99
daemon
defaults
log global
mode http
option httplog
option dontlognull
retries 3
option redispatch
option http-server-close
maxconn 2000
timeout connect 5000
timeout client 50000
timeout server 50000
frontend public
bind *:80
default_backend api
backend api
timeout server 30s
balance roundrobin
server s1 webapp1
server s2 webapp2
Select the appropreate connection in file site.js located in the wwwoot folder of the Api project.
// Use this connection when not using sticky sessions
var connection = new signalR.HubConnectionBuilder().withUrl("/socket", {
skipNegotiation: true,
transport: signalR.HttpTransportType.WebSockets
}).build();
// Use this connection when using sticky sessions
//var connection = new signalR.HubConnectionBuilder().withUrl("/socket").build();
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent