Um fragmento do script de atualização contínua que usamos para implantar uma nova versão do nosso aplicativo da web
echo "Haproxy:Disabling www1"
hactl disable server servers/www1
# Restart www1
restartServer www1
echo "Haproxy:Enabling www1"
hactl enable server servers/www1
echo "Waiting 3 secs"
sleep 3
# Repeat the above steps for all 3 servers
Quando sob carga pesada (cerca de 2000 conexões por servidor de back-end), o Haproxy retornará HTTP 503 O serviço não estará disponível por um curto período de tempo (de 1 a 30 segundos)
É possível mover todas as sessões de um servidor de back-end desativado para um que esteja ativo, sem obter o HTTP 503?
hactl
#!/bin/bash
echo "$@" | socat unix-connect:/run/haproxy/admin.sock stdio
haproxy.cfg
global
log /dev/log local0
log /dev/log local1 notice
chroot /var/lib/haproxy
stats socket /run/haproxy/admin.sock mode 777 level admin
stats timeout 30s
user haproxy
group haproxy
daemon
# Per process limit: The default is 2000, too small for us
maxconn 18000
# Increase the cache from 20000 (default), higher values reduce CPU usage
tune.ssl.cachesize 60000
# Default SSL material locations
ca-base /etc/ssl/certs
crt-base /etc/ssl/private
# Default ciphers to use on SSL-enabled listening sockets.
# For more information, see ciphers(1SSL).
ssl-default-bind-ciphers kEECDH+aRSA+AES:kRSA+AES:+AES256:!kEDH:!LOW:!EXP:!MD5:!aNULL:!eNULL
ssl-default-bind-options no-sslv3 no-tls-tickets
defaults
log global
mode http
option httplog
option http-server-close
option forwardfor
option dontlognull
# Set the listen limit: The default is 2000, too small for us
maxconn 9000
# we should fix this
# option accept-invalid-http-response
# option accept-invalid-http-request
no option checkcache
timeout connect 80000
timeout client 900000
timeout server 500000
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
frontend http-in
bind *:80
default_backend servers
frontend https-in
# add no-tlsv10 for disabling tls 1.0
bind *:443 ssl crt /etc/ssl/private/site.pem
# Activate compression
compression algo gzip
compression type text/html text/html;charset=UTF-8 text/xml text/plain text/javascript application/javascript application/x-javascript application/xml application/json text/css
default_backend servers
backend servers
# Rewrite the response location (for redirect cases)
rspirep ^Location:\ http://(.*) Location:\ https:// if { ssl_fc }
# Every connection is closed and opened to the server
option http-server-close
# Recommended to enable
option http-pretend-keepalive
# The url to check the backend servers health
option httpchk GET /srvstat
# Balancing
balance roundrobin
stick-table type string len 32 size 1M expire 3h
stick on cookie(JSESSIONID) if { hdr_sub(Cookie) JSESSIONID }
stick on url_param(JSESSIONID,;) if { url_sub JSESSIONID }
# We have 3 backend servers, one is for backup
cookie SERVERID indirect nocache
server www1 127.0.0.1:8080 check cookie www1
server www2 127.0.0.1:8081 check cookie www2
server www3 127.0.0.1:8082 check cookie www3 backup
Tags haproxy