Dear,
I am currently setting up a system containing a Haproxy with three
servers in the backend. For testing purposes the whole setup is build
inside virtual machines. The load on the backend comes from a script
utilizing curl to produce 30,000 requests as fast as possible in
parallel. Haproxy balances the incoming traffic fine between my VMs
until I simulate a downtime. In this case a few requests receive 503
errors. This is no big deal for http as browsers generally try a
reconnect immediately. However for my purposes the client shall not have
any notice of a downtime. Therefore I want to make Haproxy health check
the servers before connecting them to the client. Is it possible to
achieve this with any configuration of Haproxy or additional software?
I am looking forward for any help.
Best wishes,
Niklas Dallmann
Haproxy configuration:
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global
log /dev/log local0
log /dev/log local1 notice
chroot /var/lib/haproxy
stats socket /run/haproxy/admin.sock mode 660 level admin
stats timeout 30s
user haproxy
group haproxy
daemon
# Multhithreading
nbproc 3
cpu-map 1 0
cpu-map 2 1
cpu-map 3 2
maxconn 600
# 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). This list is from:
# https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/
ssl-default-bind-ciphers
ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!MD5:!DSS
ssl-default-bind-options no-sslv3
defaults
log global
stats enable
stats refresh 1s
stats uri /haproxy?stats
mode http
option dontlognull
timeout connect 1000
timeout client 50000
timeout server 50000
timeout check 1000
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-front
bind *:80
option forwardfor
default_backend http-back
bind-process 1
backend http-back
balance roundrobin
option httpchk
server server1 10.0.2.12:80 check fall 3 rise 2
server server2 10.0.2.13:80 check fall 3 rise 2
server server3 10.0.2.16:80 check fall 3 rise 2
bind-process 2 3
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