Regarding performance, haproxy officially said that under the same conditions lvs>haproxy>nginx, the forwarding of lvs is directly completed in the kernel space, and haproxy and nginx also need to use user space resources, while the resources called by haproxy are relatively small compared to nginx, but
HAProxy is implemented. An event-driven, single-process model that supports a very large number of concurrent connections. A multi-process or multi-threaded model is limited by memory constraints, system scheduler constraints, and ubiquitous locks, and can rarely handle thousands of concurrent connections. The event-driven model does not have these problems because it implements all these tasks on the user-space (User-Space) with better resource and time management. The downside of this model is that these programs typically scale less well on multi-core systems. That's why they have to optimize to make more work per CPU time slice (Cycle).
Software download:
Download address: http://www.haproxy.org/download/1.5/src/haproxy-1.5.5.tar.gz
Dependency package installation:
# yum install gcc gcc-c++ make zlib-devel bzip2-devel openssl -devel
haproxy install:
# tar -zvxf haproxy-1.5.5.tar.gz
# cd haproxy-1.5.5
# uname -a ## 查看linux内核版本
# make TARGET=linux26 PREFIX=/usr/local/haproxy-1.5.5
# make install PREFIX=/usr/local/haproxy-1.5.5
编辑启动文件：
# vi /etc/init.d/haproxy --添加以下内容
#!/bin/sh
#
# haproxy
#
# haproxy starting and stopping the haproxy load balancer
#
# chkconfig: 345 55 45
# description: HAProxy is a free, very fast and reliable solution
# offering high availability, load balancing, and
# proxying for TCP and HTTP-based applications
# config: /etc/haproxy/haproxy.cfg
# pidfile: /var/run/haproxy.pid
# probe: true
# Source function library.
. /etc/rc.d/init.d/functions
# Source networking configuration.
. /etc/sysconfig/network
# Check that networking is up.
[ ${NETWORKING} = "no" ] && exit 0
[ -f /usr/local/haproxy-1.5.5/sbin/haproxy ] || exit 0
[ -f /etc/haproxy/haproxy.conf ] || exit 0
# Define our actions
checkconfig() {
# Check the config file for errors
/usr/local/haproxy-1.5.5/sbin/haproxy -c -q -f /etc/haproxy/haproxy.conf
if [ $? -ne 0 ]; then
echo "Errors found in configuration file."
return 1
fi
# We're OK!
return 0
}
start() {
# Check config
/usr/local/haproxy-1.5.5/sbin/haproxy -c -q -f /etc/haproxy/haproxy.conf
if [ $? -ne 0 ]; then
echo "Errors found in configuration file."
return 1
fi
echo -n "Starting HAProxy: "
daemon /usr/local/haproxy-1.5.5/sbin/haproxy -D -f /etc/haproxy/haproxy.conf -p /var/run/haproxy.pid
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && touch /var/lock/subsys/haproxy
return $RETVAL
}
stop() {
echo -n "Shutting down HAProxy: "
killproc haproxy -USR1
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/haproxy
[ $RETVAL -eq 0 ] && rm -f /var/run/haproxy.pid
return $RETVAL
}
restart() {
/usr/local/haproxy-1.5.5/sbin/haproxy -c -q -f /etc/haproxy/haproxy.conf
if [ $? -ne 0 ]; then
echo "Errors found in configuration file."
return 1
fi
stop
start
}
check() {
/usr/local/haproxy-1.5.5/sbin/haproxy -c -q -V -f /etc/haproxy/haproxy.conf
}
rhstatus() {
status haproxy
}
reload() {
/usr/local/haproxy-1.5.5/sbin/haproxy -c -q -f /etc/haproxy/haproxy.conf
if [ $? -ne 0 ]; then
echo "Errors found in configuration file."
return 1
fi
echo -n "Reloading HAProxy config: "
/usr/local/haproxy-1.5.5/sbin/haproxy -f /etc/haproxy/haproxy.conf -p /var/run/haproxy.pid -sf $(cat /var/run/haproxy.pid)
success $"Reloading HAProxy config: "
echo
}
# Possible parameters
case "$1" in
start)
start
;;
stop)
stop
;;
status)
rhstatus
;;
restart)
restart
;;
reload)
reload
;;
checkconfig)
check
;;
*)
echo "Usage: haproxy {start|stop|status|restart|reload|checkconfig}"
exit 1
esac
exit 0
authorization:
# chmod +x /etc/init.d/haproxy
Edit the haproxy configuration file:
# mkdir /etc/
haproxy # vi /etc/haproxy/haproxy.conf
global
maxconn 4096 #Default maximum number of connections
pidfile /var/run/haproxy.pid #The pid storage path of haproxy
daemon #Run haproxy in the
background nbproc 1 #Number of processes
defaults
log global
mode http #The category processed (#7 layer http;4 layer tcp)
retries 3 # If the connection fails for three times, it is considered that the server is unavailable
option httplog
option httpclose
option redispatch #After the server corresponding to serverId hangs, it is forced to be directed to other healthy servers
option abortonclose #When the server load is very high, it will automatically end the current queue processing for a long time connection
maxconn 4096 #maximum number of connections
timeout connect 50000 #connection timeout
timeout client 50000 #client timeout
timeout server 50000 #Server timeout
balance roundrobin #Default load balancing method, polling method
listen mysql_proxy
bind *:3366 #Listening port
mode tcp #4-layer mode of tcp
balance roundrobin
option tcpka
option httpchk
server mysqldb1 172.16.10.70:3306 weight 1 #weight represents the weight
server mysqldb1 172.16.10.71:3306 weight 1 #weight represents the weight
listen stats
bind *:8888
mode http
option httplog
option httpclose
balance roundrobin
stats refresh 5s
stats uri / #Website health detection URL, used to detect whether the website managed by HAProxy is available, returns 200 normally, returns 503 abnormally
stats realm Haproxy\ Statistics
stats auth admin:admin #Account password
Start
and check: # service haproxy start
# netstat -plantu | grep 3366
tcp 0 0 0.0.0.0:3366 0.0.0.0:* LISTEN 23626/haproxy