Use haproxy for TCP layer load balancing in Ubuntu

First download the haproxy package:

Wget http://haproxy.1wt.eu/download/1.4/src/haproxy-1.4.13.tar.gz

Installation:

Tar zxvf haproxy-1.4.13.tar.gz

Make target = linux26 prefix =/usr/local/haproxy # My system kernel is 2.6, so target = linux26

Make install prefix =/usr/local/haproxy

Then configure:

VI/etc/haproxy. cfg

# Write the following content:

########### Global configuration #########
Global
Daemon
Nbproc 1
Pidfile/var/run/haproxy. PID


######## Default configuration ############
Ults
Mode HTTP # default mode {tcp | HTTP | health}, TCP is Layer 4, HTTP is Layer 7, health only returns OK
Retries 2 # If the connection fails twice, the server is considered unavailable. You can also set
Option redispatch # When the server corresponding to the serverid fails, it is forcibly directed to other healthy servers.
Option abortonclose # When the server load is high, the link for processing the queue for a long time is automatically terminated.
Maxconn 4096 # default maximum number of connections
Timeout connect 5000 MS # connection timeout
Timeout client 30000 ms # client timeout
Timeout server 30000 ms # server timeout
# Timeout Check 2000 # = heartbeat detection timeout
Log 127.0.0.1 local0 err # [err warning info debug]


######## Statistics page configuration ########
Listen admin_stats
Bind 0.0.0.0: 1080 # listening port
Mode HTTP # Layer-7 http mode
Option httplog # Use http log format
# Log 127.0.0.1 local0 err
Maxconn 10
Stats refresh 30 s # statistics page automatic refresh time
Stats uri/stats # URL of the statistics page
Stats realm xingcloud \ haproxy # text displayed in the password box on the statistics page
Stats auth admin: Admin # user name and password settings on the statistics page
Stats hide-version # Hide the haproxy version on the statistics page


######## Test1 configuration #################
Listen test1
Bind 0.0.0.0: 90
Mode TCP
# Maxcon 4086
# Log 127.0.0.1 local0 debug
Server S1 10.18.138.201: 80
Server S2 10.18.102.190: 80
Server S3 10.18.102.189: 80
Server S4 10.18.102.188: 80
Server S5 10.18.102.187: 80
######## Frontend configuration ##############


######## Test2 configuration #################
Listen Test2
Bind 0.0.0.0: 91
Mode TCP
# Maxcon 4086
# Log 127.0.0.1 local0 debug
Server S1 10.18.138.130: 80 weight 1
Server S2 10.18.138.201: 8080 weight 6
######## Frontend configuration ##############

OK. Start haproxy.

Haproxy/etc/haproxy. cfg

Try it immediately and find that the load is successful.

However, there is a problem where you cannot see the log because I didn't start syslog.

In ubuntu, rsyslogd must be started.

My machine is not installed. Install rsyslogd first.

Apt-Get install rsyslog

After the installation is complete, configure rsyslog

VI/etc/rsyslog. d/haproxy. conf

Add the following content:

$ Modload imudp
$ Udpserverrun 514

Local0. */var/log/haproxy. Log

Save and restart rsyslogd.

Restart rsyslogd

OK. Now you can see the log.

Try it.

Tail-F/var/log/haproxy. Log

Finally, add a command for smooth restart:

Haproxy-F/etc/haproxy. cfg-SF 'cat/var/run/haproxy. Pi'