LVS+NAT负载
https://s3.运维网.com/wyfs02/M01/8F/A0/wKiom1jnIY3BILvrAAAItbMhM0w081.png-wh_500x0-wm_3-wmp_4-s_3253839533.png一、负载均衡器端
1.安装（MASTER、BACKUP)
A、wget http://mirrors.163.com/.help/CentOS6-Base-163.repo -O /etc/yum.repos.d/CentOS-Base.repo
B、yum makecache
C、yum -y update
D、yum -y install ipvsadm modcluster piranha system-config-cluster
2.撰写配置文件
# 在内核里打开ip转发功能
# Kernel sysctl configuration file
net.ipv4.ip_forward = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 0
kernel.core_uses_pid = 1
net.ipv4.tcp_syncookies = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296
net.core.netdev_max_backlog = 32768
net.core.somaxconn = 32768
net.core.rmem_max = 16777216
net.core.rmem_default = 8388608
net.core.wmem_max = 16777216
net.core.wmem_default = 8388608
net.ipv4.tcp_sack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_rmem = 8192 436600 873200
net.ipv4.tcp_wmem = 8192 436600 873200
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_max_orphans = 3276800
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 2
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_tw_recycle = 1
# net.ipv4.tcp_tw_len = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_fin_timeout = 30
net.ipv4.tcp_keepalive_time = 1200
net.ipv4.ip_local_port_range = 1024 65500
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_max_tw_buckets = 5000
# cat /etc/sysconfig/ha/lvs.cf
serial_no = 28
primary = 183.62.176.148
primary_private = 172.20.20.121
service = lvs
backup_active = 1
backup = 183.62.176.149
backup_private = 172.20.20.122
heartbeat = 1
heartbeat_port = 539
keepalive = 6
deadtime = 18
network = nat
nat_router = 172.20.20.7 eth0:1
nat_nmask = 255.255.252.0
reservation_conflict_action = preempt
debug_level = NONE
virtual web_http {
active = 1
address = 183.62.176.154 eth1:1
vip_nmask = 255.255.255.240
port = 8888
send = "GET / HTTP/1.0\r\n\r\n"
expect = "HTTP"
use_regex = 0
load_monitor = none
scheduler = wrr
protocol = tcp
timeout = 3
reentry = 15
quiesce_server = 1
server web_realserver1 {
address = 172.20.20.5
active = 1
port = 80
weight = 1
}
server web_realserver2 {
address = 172.20.20.5
active = 1
port = 81
weight = 1
}
}
# cat /etc/rc.local
#!/bin/sh
iptables -t nat -A POSTROUTING -s 172.20.20.0/22 -j MASQUERADE
/sbin/modprobe ip_tables
/sbin/service pulse start
ulimit -SHn 65535
watch ipvsadm -L -n
/sbin/service pulse restart
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