安装keepalived和nginx
yum install -y keepalived
yum install -y nginx
关闭防火墙和SELinux
systemctl stop firewalld
setenforce 0
配置网卡ens33
[root@lynn-04 ~]# vim /etc/sysconfig/network-scripts/ifcfg-ens33
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=static
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=ens33
DEVICE=ens33
ONBOOT=yes
IPADDR=192.168.130.116
NETMASK=255.255.255.0
GATEWAY=192.168.130.2
DNS1=119.29.29.29
编辑/etc/keepalived/keepalived.conf
写入如下内容:
[root@lynn-04 ~]# vim /etc/keepalived/keepalived.conf
script "/usr/local/sbin/check_ng.sh"
interval 3
}
vrrp_instance VI_1 {
state MASTER
interface ens33
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass aminglinux>com
}
virtual_ipaddress {
192.168.130.100
}
track_script {
chk_nginx
}
}
virtual_server 192.168.130.100 80 {
#(每隔10秒查询realserver状态)
delay_loop 10
#(lvs 算法)
lb_algo wlc
#(DR模式)
lb_kind DR
#(同一IP的连接0秒内被分配到同一台realserver)
persistence_timeout 0
#(用TCP协议检查realserver状态)
protocol TCP
real_server 192.168.130.118 80 {
#(权重)
weight 100
TCP_CHECK {
#(10秒无响应超时)
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.130.119 80 {
weight 100
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
定义监控脚本/usr/local/sbin/check_ng.sh
[root@lynn-04 ~]# vim /usr/local/sbin/check_ng.sh
写入下面内容
#!/bin/bash
#时间变量,用于记录日志
d=`date --date today +%Y%m%d_%H:%M:%S`
#计算nginx进程数量
n=`ps -C nginx --no-heading|wc -l`
#如果进程为0,则启动nginx,并且再次检测nginx进程数量,
#如果还为0,说明nginx无法启动,此时需要关闭keepalived
if [ $n -eq "0" ]; then
/etc/init.d/nginx start
n2=`ps -C nginx --no-heading|wc -l`
if [ $n2 -eq "0" ]; then
echo "$d nginx down,keepalived will stop" >> /var/log/check_ng.log
systemctl stop keepalived
fi
fi
更改/usr/local/sbin/check_ng.sh权限
[root@lynn-04 ~]# chmod 755 /usr/local/sbin/check_ng.sh
编写脚本 /usr/local/sbin/lvs_dr.sh
[root@lynn-04 ~]# vim /usr/local/sbin/lvs_dr.sh
#! /bin/bash
echo 1 > /proc/sys/net/ipv4/ip_forward
ipv=/usr/sbin/ipvsadm
vip=192.168.130.100
rs1=192.168.130.118
rs2=192.168.130.119
#注意这里的网卡名字
ifdown ens33
ifup ens33
ifconfig ens33:2 $vip broadcast $vip netmask 255.255.255.255 up
route add -host $vip dev ens33:2
执行脚本 /usr/local/sbin/lvs_dr.sh
[root@lynn-04 ~]# sh /usr/local/sbin/lvs_dr.sh
成功断开设备 ‘ens33‘。
连接已成功激活(D-Bus 活动路径:/org/freedesktop/NetworkManager/ActiveConnection/4)
启动keepalived
[root@lynn-04 ~]# systemctl start keepalived
[root@lynn-04 ~]# ps aux |grep keepalived
root 2190 0.1 0.1 120740 1404 ? Ss 14:33 0:00 /usr/sbin/keepalived -D
root 2191 0.1 0.3 127480 3336 ? S 14:33 0:00 /usr/sbin/keepalived -D
root 2192 0.0 0.3 131780 3108 ? S 14:33 0:00 /usr/sbin/keepalived -D
root 2206 0.0 0.0 112676 988 pts/0 S+ 14:33 0:00 grep --color=auto keepalived
启动nginx
[root@lynn-04 ~]# /etc/init.d/nginx start
[root@lynn-04 ~]# ps aux |grep nginx
root 912 0.0 0.1 45988 1240 ? Ss 08:06 0:00 nginx: master process /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
nobody 913 0.0 0.4 48476 4388 ? S 08:06 0:00 nginx: worker process
nobody 915 0.0 0.4 48476 4392 ? S 08:06 0:00 nginx: worker process
root 2072 0.0 0.0 112680 980 pts/0 S+ 10:23 0:00 grep --color=auto nginx
把nginx的默认页做个标记
[root@lynn-04 ~]# echo master > /data/wwwroot/default/index.html
在另一台机器使用从ip访问
得到下面结果
[root@lynn-02 ~]# curl 192.168.130.116
master
安装keepalived和nginx
yum install -y keepalived
yum install -y nginx
关闭防火墙和SELinux
systemctl stop firewalld
setenforce 0
配置网卡ens33
[root@lynn-06 ~]# vim /etc/sysconfig/network-scripts/ifcfg-ens33
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=static
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=ens33
UUID=fef8a686-6a1e-49bc-b03e-7797fc4c58bb
DEVICE=ens33
ONBOOT=yes
IPADDR=192.168.130.128
NETMASK=255.255.255.0
GATEWAY=192.168.130.2
DNS1=119.29.29.29
编辑/etc/keepalived/keepalived.conf
写入如下内容:
[root@lynn-06 ~]# vim /etc/keepalived/keepalived.conf
interval 3
}
vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 51
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass aminglinux>com
}
virtual_ipaddress {
192.168.130.100
}
track_script {
chk_nginx
}
}
virtual_server 192.168.130.100 80 {
#(每隔10秒查询realserver状态)
delay_loop 10
#(lvs 算法)
lb_algo wlc
#(DR模式)
lb_kind DR
#(同一IP的连接0秒内被分配到同一台realserver)
persistence_timeout 0
#(用TCP协议检查realserver状态)
protocol TCP
real_server 192.168.130.118 80 {
#(权重)
weight 100
TCP_CHECK {
#(10秒无响应超时)
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.130.119 80 {
weight 100
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
定义监控脚本/usr/local/sbin/check_ng.sh
[root@lynn-06 ~]# vim /usr/local/sbin/check_ng.sh
#时间变量,用于记录日志
d=`date --date today +%Y%m%d_%H:%M:%S`
#计算nginx进程数量
n=`ps -C nginx --no-heading|wc -l`
#如果进程为0,则启动nginx,并且再次检测nginx进程数量,
#如果还为0,说明nginx无法启动,此时需要关闭keepalived
if [ $n -eq "0" ]; then
systemctl start nginx
n2=`ps -C nginx --no-heading|wc -l`
if [ $n2 -eq "0" ]; then
echo "$d nginx down,keepalived will stop" >> /var/log/check_ng.log
systemctl stop keepalived
fi
fi
更改/usr/local/sbin/check_ng.sh权限
[root@lynn-06 ~]# chmod 755 /usr/local/sbin/check_ng.sh
编写脚本 /usr/local/sbin/lvs_dr.sh
[root@lynn-06 ~]# vim /usr/local/sbin/lvs_dr.sh
#! /bin/bash
echo 1 > /proc/sys/net/ipv4/ip_forward
ipv=/usr/sbin/ipvsadm
vip=192.168.130.100
rs1=192.168.130.118
rs2=192.168.130.119
#注意这里的网卡名字
ifdown ens33
ifup ens33
ifconfig ens33:2 $vip broadcast $vip netmask 255.255.255.255 up
route add -host $vip dev ens33:2
执行脚本 /usr/local/sbin/lvs_dr.sh
[root@lynn-06 ~]# sh /usr/local/sbin/lvs_dr.sh
成功断开设备 ‘ens33‘。
连接已成功激活(D-Bus 活动路径:/org/freedesktop/NetworkManager/ActiveConnection/4)
启动keepalived
[root@lynn-06 ~]# systemctl start keepalived
[root@lynn-06 ~]# ps aux |grep keepalived
root 2190 0.1 0.1 120740 1404 ? Ss 14:33 0:00 /usr/sbin/keepalived -D
root 2191 0.1 0.3 127480 3336 ? S 14:33 0:00 /usr/sbin/keepalived -D
root 2192 0.0 0.3 131780 3108 ? S 14:33 0:00 /usr/sbin/keepalived -D
root 2206 0.0 0.0 112676 988 pts/0 S+ 14:33 0:00 grep --color=auto keepalived
启动nginx
[root@lynn-06 ~]# systemctl start nginx
[root@lynn-06 ~]# ps aux |grep nginx
root 912 0.0 0.1 45988 1240 ? Ss 08:06 0:00 nginx: master process /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
nobody 913 0.0 0.4 48476 4388 ? S 08:06 0:00 nginx: worker process
nobody 915 0.0 0.4 48476 4392 ? S 08:06 0:00 nginx: worker process
root 2072 0.0 0.0 112680 980 pts/0 S+ 10:23 0:00 grep --color=auto nginx
把nginx的默认页做个标记
[root@lynn-06 ~]# echo backup > /usr/share/nginx/html/index.html
在另一台机器使用从ip访问
得到下面结果
[root@lynn-02 ~]# curl 192.168.130.128
backup
安装nginx
yum install -y nginx
关闭防火墙和SELinux
systemctl stop firewalld
setenforce 0
配置网卡ens33
[root@lynn-05 ~]# vim /etc/sysconfig/network-scripts/ifcfg-ens33
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=static
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=ens33
DEVICE=ens33
ONBOOT=yes
IPADDR=192.168.130.118
NETMASK=255.255.255.0
GATEWAY=192.168.130.2
DNS1=119.29.29.29
编写脚本/usr/local/sbin/lvs_rs.sh
[root@lynn-05 ~]# vim /usr/local/sbin/lvs_rs.sh
#/bin/bash
vip=192.168.130.100
#把vip绑定在lo上,是为了实现rs直接把结果返回给客户端
ifdown lo
ifup lo
ifconfig lo:0 $vip broadcast $vip netmask 255.255.255.255 up
route add -host $vip lo:0
#以下操作为更改arp内核参数,目的是为了让rs顺利发送mac地址给客户端
#参考文档www.cnblogs.com/lgfeng/archive/2012/10/16/2726308.html
echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
执行脚本/usr/local/sbin/lvs_rs.sh
[root@lynn-05 ~]# sh /usr/local/sbin/lvs_rs.sh
启动nginx
[root@lynn-05 ~]# systemctl start nginx
[root@lynn-05 ~]# ps aux |grep nginx
root 995 0.0 0.2 122908 2236 ? Ss 14:29 0:00 nginx: master process /usr/sbin/nginx
nginx 996 0.0 0.3 123292 3136 ? S 14:29 0:00 nginx: worker process
nginx 997 0.0 0.3 123292 3136 ? S 14:29 0:00 nginx: worker process
nginx 998 0.0 0.3 123292 3136 ? S 14:29 0:00 nginx: worker process
nginx 999 0.0 0.3 123292 3136 ? S 14:29 0:00 nginx: worker process
root 1006 0.0 0.0 112676 980 pts/0 R+ 14:30 0:00 grep --color=auto nginx
把nginx的默认页做个标记
[root@lynn-05 ~]# echo This is lynn-05 > /usr/share/nginx/html/index.html
在另一台机器使用从ip访问
得到下面结果
[root@lynn-02 ~]# curl 192.168.130.118
This is lynn-05
安装nginx
yum install -y nginx
关闭防火墙和SELinux
systemctl stop firewalld
setenforce 0
配置网卡ens33
[root@lynn-07 ~]# vim /etc/sysconfig/network-scripts/ifcfg-ens33
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=static
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=ens33
DEVICE=ens33
ONBOOT=yes
IPADDR=192.168.130.119
NETMASK=255.255.255.0
GATEWAY=192.168.130.2
DNS1=119.29.29.29
编写脚本/usr/local/sbin/lvs_rs.sh
[root@lynn-07 ~]# vim /usr/local/sbin/lvs_rs.sh
#/bin/bash
vip=192.168.130.100
#把vip绑定在lo上,是为了实现rs直接把结果返回给客户端
ifdown lo
ifup lo
ifconfig lo:0 $vip broadcast $vip netmask 255.255.255.255 up
route add -host $vip lo:0
#以下操作为更改arp内核参数,目的是为了让rs顺利发送mac地址给客户端
#参考文档www.cnblogs.com/lgfeng/archive/2012/10/16/2726308.html
echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
执行脚本/usr/local/sbin/lvs_rs.sh
[root@lynn-07 ~]# sh /usr/local/sbin/lvs_rs.sh
启动nginx
[root@lynn-07 ~]# systemctl start nginx
[root@lynn-07 ~]# ps aux |grep nginx
root 990 0.0 0.2 122908 2244 ? Ss 14:30 0:00 nginx: master process /usr/sbin/nginx
nginx 991 0.0 0.3 123292 3144 ? S 14:30 0:00 nginx: worker process
nginx 992 0.0 0.3 123292 3144 ? S 14:30 0:00 nginx: worker process
nginx 993 0.0 0.3 123292 3144 ? S 14:30 0:00 nginx: worker process
nginx 994 0.0 0.3 123292 3144 ? S 14:30 0:00 nginx: worker process
root 996 0.0 0.0 112676 980 pts/0 S+ 14:30 0:00 grep --color=auto nginx
把nginx的默认页做个标记
[root@lynn-07 ~]# echo This is lynn-07 > /usr/share/nginx/html/index.html
在另一台机器使用从ip访问
得到下面结果
[root@lynn-02 ~]# curl 192.168.130.119
This is lynn-07
从下图可以看出当vip在主机上时可以实现负载均衡
从下图可以看出当主机keepalived停止后vip就出现在从机上时也能可以实现负载均衡
从下图可以看出当主机keepalived再次启动时vip又回到主机负载均衡还是可以实现
综上这里就同时实现了高可用和负载均衡
原文:http://blog.51cto.com/10963213/2096577