Last time we used Nginx for reverse proxy TCP, we found that the number of links in the test was still a few K, so we hung up. According to the official recommendation, we used Haproxy for testing.

install

Installation command:
yum install haproxy
The configuration file of haproxy is located in / etc/haproxy /. To prevent errors, first back up the original configuration file:
cd /etc/haproxy/
mv haproxy.cfg haproxy.cfg.backup

Centos6 command:
Start / stop / restart: service haproxy start/stop/restart/

Centos7 command:
/bin/systemctl start haproxy.service
/bin/systemctl stop haproxy.service
/bin/systemctl restart haproxy.service

Log configuration

Configure rsyslog
We need to use rsyslog to record the log of HAProxy, edit the rsyslog.conf configuration file, and open port 514 of UDP:
vim /etc/rsyslog.conf
Remove comments such as the following:

# Provides UDP syslog reception
$ModLoad imudp
$UDPServerRun 514
local3.* /var/log/haproxy.log #Add this sentence

Save and exit, restart rsyslog and Haproxy
Restart rsyslog:
systemctl restart rsyslog

View process:

[root@ffm ~]# ps -ef | grep haproxy
root     10307     1  0 Aug14 ?        00:00:00 /usr/sbin/haproxy-systemd-wrapper -f /etc/haproxy/haproxy.cfg -p /run/haproxy.pid
haproxy  10308 10307  0 Aug14 ?        00:00:00 /usr/sbin/haproxy -f /etc/haproxy/haproxy.cfg -p /run/haproxy.pid -Ds
haproxy  10309 10308  0 Aug14 ?        00:00:59 /usr/sbin/haproxy -f /etc/haproxy/haproxy.cfg -p /run/haproxy.pid -Ds
root     16723 16698  0 17:10 pts/0    00:00:00 grep --color=auto haproxy

configuration file

File configuration / etc/haproxy/haproxy.cfg

global #Global configuration
   log 127.0.0.1 local3 info #
   maxconn 100000
   user haproxy
   group haproxy
   daemon          #Set as background process
   nbproc 4        #Number of processes (multiple processes can be set to improve performance) 
   ulimit-n 65535  #Limit on quantity of ulimit


#Haproxy console management
listen admin_stats
   stats    enable
   bind     *:9090  #ip
   mode     http    #
   option   httplog
   log      global
   maxconn  10
   stats    refresh 30s   #Statistics page auto refresh time
   stats    uri /admin    #Visited URI IP: 8080 / Admin
   stats    realm haproxy
   stats    auth admin:Redhat  #Authentication user name and password
   stats    hide-version   #Hide the version number of HAProxy
   stats    admin if TRUE  #Management interface. If the authentication is successful, you can manage the node through Web UI


#EMQ background controller display      
frontend emqtt-admin-front
   bind *:18089
   mode http
   default_backend emqtt-admin-backend

backend emqtt-admin-backend
   mode http
   balance roundrobin
   server emq1 127.0.0.1:18083 check
   server emq2 127.0.0.3:18083 check


#EMQ front end TCP agent
frontend emqtt-front
   bind *:1889
   mode tcp  #The default mode is mode {tcp| http| health}. TCP is layer 4, HTTP is layer 7, and health only returns OK  
   option redispatch #When the server corresponding to serverId is hung up, it is forced to be directed to other healthy servers  
   option abortonclose #When the server load is very high, automatically end the link that the current queue has been processing for a long time
   balance roundrobin    #Load balancing algorithm 
   maxconn 100000        #Maximum number of links
   timeout connect 60s   #connection timed out 
   timeout client  30000 #Client timeout,
   ###timeout client 24h
   ##This parameter is very useful when using EMQ stress test. The timeout period of the device at the beginning is too long, resulting in {shutdown, connack ﹣ timeout} in a short time

   timeout server  30000 #server time-out    
   default_backend mqtt


backend emqtt-backend
   balance roundrobin
   server emq1 127.0.0.1:1884 check inter 10000 fall 2 rise 5 weight 1
   server emq2 127.0.0.2:1884 check inter 10000 fall 2 rise 5 weight 1

Console access address: http://127.0.0.1:9090/admin