Haproxy 优化
[*]Haproxy 自身健康检查
vi /usr/local/haproxy/sbin/check_haproxy.sh
#!/bin/sh
PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin:/usr/local/sbin
[[ -e "/etc/rc.d/init.d/haproxy" ]] || exit 1
[[ -z `ps aux | grep /usr/sbin/haproxy | grep -v grep` ]] && service haproxy start && exit 1
ETH1_ADDR=`/sbin/ifconfig eth0 | awk -F ':' '/inet addr/{print $2}' | sed 's///g'`
[[ -z `curl -I -s "http://${ETH1_ADDR}" | grep "200 OK"` ]] && service haproxy restart
check harpy Code chmox +x /usr/local/haproxy/sbin/check_haproxy.sh
设置定时检查任务
crontab -e
*/5 * * * * /usr/local/haproxy/sbin/check_haproxy.sh >/dev/null 2>&1
备注：若无法运行，请根据haproxy安装路径和绑定的网卡对代码做简单修改
[*]进阶配置
mode http
# 设置为http模式
balance source
# 设置haproxy的调度算法为源地址hash
cookie SERVERID
# 允许向cookie插入SERVERID，每台服务器的SERVERID可在下面使用cookie关键字定义
option httpchk GET /test/index.php
# 开启对后端服务器的健康检测，通过GET /test/index.php来判断后端服务器的健康情况
server php_server_1 10.12.25.68:80 cookie 1 check inter 2000 rise 3 fall 3 weight 2
server php_server_2 10.12.25.72:80 cookie 2 check inter 2000 rise 3 fall 3 weight 1
server php_server_bak 10.12.25.79:80 cookie 3 check inter 1500 rise 3 fall 3 backup
# server语法：server [:port]
# 使用server关键字来设置后端服务器；为后端服务器所设置的内部名称，该名称将会呈现在日志或警报中、后端服务器的IP地址
# 支持端口映射、指定该服务器的SERVERID为1
# 接受健康监测、监测的间隔时长，单位毫秒
# 监测正常多少次后被认为后端服务器是可用的
# 监测失败多少次后被认为后端服务器是不可用的
# 分发的权重、最后为备份用的后端服务器，当正常的服务器全部都宕机后，才会启用备份服务器
[*]优化网络
vim /etc/sysctl.conf
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_fin_timeout = 30
net.ipv4.tcp_keepalive_time = 1200
net.ipv4.ip_local_port_range = 1024 65000
net.ipv4.tcp_max_syn_backlog = 8192
net.ipv4.tcp_max_tw_buckets = 80000
net.core.somaxconn = 32768
net.ipv4.tcp_keepalive_probes = 5
net.ipv4.tcp_keepalive_intvl = 20
net.core.wmem_default = 8388608
net.core.rmem_default = 8388608
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
net.core.netdev_max_backlog = 32768
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 2
net.ipv4.tcp_retries2 = 5
net.ipv4.tcp_mem = 41943040 73400320 94371840
net.ipv4.tcp_max_orphans = 3276800
fs.file-max = 1300000
sysctl -p
[*]参考文档
http://sofar.blog.iyunv.com/353572/1291013/
http://leejia.blog.iyunv.com/4356849/1421882
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