HAProxy
http://www.haproxy.org/ HAProxy is a free, very fast and reliable solution offering high availability, load balancing, and proxying for TCP and HTTP-based applications. It is particularly suited for very high traffic web sites and powers quite a number of the world's most visited ones. Over the years it has become the de-facto standard opensource load balancer, is now shipped with most mainstream Linux distributions, and is often deployed by default in cloud platforms.
Installation
sudo add-apt-repository ppa:vbernat/haproxy-1.6 sudo apt-get update sudo apt-get install haproxy sudo service haproxy status # voir le log de HAproxy tail -f /var/log/haproxy.log HAHOST=haproxy HAHOST=localhost
Open http://localhost/haproxy?stats
Configuration en SSL Pass-throught
TODO
/etc/haproxy/haproxy.cfg
./http_svr.js
./https_svr.js
sudo service haproxy restart # lancer 3 serveurs express npm install express for port in 8081 8082 8083 ; do nodejs http_srv.js $port & done HOST=localhost curl $HOST:8081 curl $HOST:8082 curl $HOST:8083 # on peut observer la politique de round-robin curl $HOST:80 curl $HOST:80 curl $HOST:80 curl $HOST:80 curl -k https://$HOST curl -k https://$HOST curl -k https://$HOST curl -k https://$HOST
Configuration en SSL Terminaison
Le mode SSL Terminaison permet de diriger les requêtes HTTPS des clients vers les backends HTTP
Créer un certificat auto-signé pour le(s) frontend(s) HAProxy (voir)
sudo mkdir /etc/ssl/air sudo openssl genrsa -out /etc/ssl/air/air.key 1024 sudo openssl req -new -key /etc/ssl/air/air.key -multivalue-rdn -subj "/C=FR/L=GRENOBLE/O=UGA/O=POLYTECH/OU=RICM/CN=AIR/emailAddress=air@imag.fr" -out /etc/ssl/air/air.csr sudo openssl x509 -req -days 365 -in /etc/ssl/air/air.csr -signkey /etc/ssl/air/air.key -out /etc/ssl/air/air.crt sudo cat /etc/ssl/air/air.crt /etc/ssl/air/air.key | sudo tee /etc/ssl/air/air.pem
Editer le fichier de configuration /etc/haproxy/haproxy.cfg
TODO
Exécuter les commandes
# verifier si le fichier de configuration est valide (option -c) sudo haproxy -f /etc/haproxy/haproxy.cfg -c # Relancer le service sudo service haproxy restart # voir le log de HAproxy sudo tail -f /var/log/haproxy.log
Configuration en SSL Terminaison avec authentification mutuelle
TODO
Failover du ferme de serveurs
Configuration HA avec Keepalived
- https://www.howtoforge.com/setting-up-a-high-availability-load-balancer-with-haproxy-keepalived-on-debian-lenny
- http://behindtheracks.com/2014/04/redundant-load-balancers-haproxy-and-keepalived/