1.在HaProxy官网中下载最新安装包haproxy-1.7.2.tar.gz (http://www.haproxy.org/#down)
2.解压至ln-master：/data5/haproxy-1.7.2目录
3.安装：
A．make TARGET=linux31 ARCH=x86_64 PREFIX=/usr/local/haproxy (将haproxy安装到指定目录，TARGET指定内核版本)
B．进入/usr/local/haproxy中创建配置文件haproxy.cfg(若有此配置文件则不用创建)
C．修改配置文件haproxy.cfg,配置文件详见/usr/local/haproxy/haproxy.cfg
4.启动haproxy：
/usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/haproxy.cfg（-f指定配置文件）
5.监控
http://10.192.28.142:1081/haproxy-stats
6.使用
impala-shell -i ln-master:25003
注： Impala守护进程Beeswax端口21000映射到haproxy 25003
Impala守护进程HiveServer2端口21050映射到haproxy 21051
haproxy.cfg配置文件如下：
global
# To have these messages end up in /var/log/haproxy.log you will
# need to:
# 1) configure syslog to accept network log events. This is done by adding the '-r' option to the #SYSLOGD_OPTIONS in /etc/sysconfig/syslog
# 2) configure local2 events to go to the /var/log/haproxy.log file. A line like the following can be #added to /etc/sysconfig/syslog
# local2.* /var/log/haproxy.log
log 127.0.0.1 local0
log 127.0.0.1 local1 notice
chroot /usr/local/haproxy
pidfile /var/run/haproxy.pid
maxconn 4000
user haproxy
group haproxy
daemon
# turn on stats unix socket
#stats socket /var/lib/haproxy/stats
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
# You might need to adjust timing values to prevent timeouts.
defaults
mode http
log global
option httplog
option dontlognull
option http-server-close
# option forwardfor except 127.0.0.0/8
option redispatch
retries 3
maxconn 3000
timeout connect 120s
timeout client 600s
timeout server 600s
# This sets up the admin page for HA Proxy at port 25002.
listen stats
bind 0.0.0.0:1081
stats uri /haproxy-stats
stats realm /haproxy-admin
balance
mode http
stats enable
stats auth admin:admin
stats admin if TRUE
# This is the setup for Impala. Impala client connect to load_balancer_host:25003.
# HAProxy will balance connections among the list of servers listed below.
# The list of Impalad is listening at port 21000 for beeswax (impala-shell) or original ODBC driver.
# For JDBC or ODBC version 2.x driver, use port 21050 instead of 21000.
listen impala
bind 0.0.0.0:25003
mode tcp
option tcplog
balance leastconn
server impala1 ln-node1:21000 check
server impala2 ln-node2:21000 check
server impala3 ln-node3:21000 check
server impala4 ln-node4:21000 check
server impala5 ln-node5:21000 check
server impala6 ln-node6:21000 check
server impala7 ln-node7:21000 check
# Setup for Hue or other JDBC-enabled applications.
# In particular, Hue requires sticky sessions.
# The application connects to load_balancer_host:21051, and HAProxy balances
# connections to the associated hosts, where Impala listens for JDBC
# requests on port 21050.
listen impalajdbc
bind 0.0.0.0:21051
mode tcp
option tcplog
balance source
server impala8 ln-node1:21050 check
server impala9 ln-node2:21050 check
server impala10 ln-node3:21050 check
server impala11 ln-node4:21050 check
server impala12 ln-node5:21050 check
server impala13 ln-node6:21050 check
server impala14 ln-node7:21050 check
关于Hue中Haproxy配置请参考此链接。