做纺织外贸网站,wordpress建的大型网站,建筑工程网站哪个好,51源码keepalive简介
keepalive为LVS应用延伸的高可用服务。lvs的调度器无法做高可用。但keepalive不是为lvs专门集群服务的#xff0c;也可以为其他的的代理服务器做高可用。 keepalive在lvs的高可用集群#xff0c;主调度器和备调度器(可以有多个) 一主两备或一主一备。 VRRP: k… keepalive简介
keepalive为LVS应用延伸的高可用服务。lvs的调度器无法做高可用。但keepalive不是为lvs专门集群服务的也可以为其他的的代理服务器做高可用。 keepalive在lvs的高可用集群主调度器和备调度器(可以有多个) 一主两备或一主一备。 VRRP: keepalived是基于vrrp协议实现Ivs服务的高可用。解决了调度器单节点的故障问题。 VRRP协议提高网络路由器的可靠性开发的一种协议。
vrrp工作原理 ·选举出主和备预先设定主备的优先级。主的优先级较高备的优先级低一旦开启服务器优先级高的会自定抢占主的位置。 ·VRRP组播通信: 224.0.0.18 VRRP协议当中的主备服务器通过组播地进行通信交换主备服务器之间的运行状态。主服务会周期性的发送vrrp协议报文告诉备主的当前状态。 ·主备切换主服务器发生故障,或者不可达VRRP协议会把请求转义到备服务器。通过组播地址VRRP可以迅速的通知其他服务器发生了主备切换确保新的主服务器可以正常处理客户端的请求。 ·故障恢复: 一旦主服务器恢复通信由组播地址进行通信发现在恢复的主服务器优先级更高会抢占原主服务器的位置成为主服务器调度和接受请求。
keepalive工作原理
主调度器能够正常运行时由主调度器进行后端真实服务器的分配处理。其余的备用调度器处于冗余状态。 不参与集群的运转。主调度器故障无法运行备调度器才会承担主调度器的工作。 一旦主调度恢复工作继续由主调度器进行处理备调度器又成了冗余。
keepalive的体系模块:
全局模块core模块负载整个keepalived启
动加载和维护 VRRP模块实现vrrp协议主备切换 check模块负责后端真实服务器健康检查配置真实服务器的模块当中。
安装keepalived yum -y install keepalived ipvsadm
vim /etc/keepalived/keepalived.conf下配置说明
·邮箱地smtp_server
·主备服务的id,主和备的id不能一致router_id_01
·取消严格遵守vrrp协议功能不取消VIP无法连接#vrrp_strict
·标识主身份state MASTER
·指定vip地址的物理接口interface ens33
·虚拟路由器的id号virtual_router_id 10
·发送报文的间隔时间advert_int 30
·指定集群的vip地址virtual_ipaddress
·健康检查的间隔时间delay_loop 6 单位s
·负载均衡的调度算法lb algo rr
·指定lvs集群的工作方式(要大写)lb_kind NAT
·连接保持persistence_timeout 50 单位s
·VIP模块virtual server 192.168.233.100 80
·后端真实服务器的轮询权重real_server 192.168.233.30 80
·检测目标的端口号connect_port 80
·连接超时时间connect_timeout 3 单位s
·重试的次数nb_get_retry 3
·重试间隔秒数delay_before_retry 4
实验(LVS-DR)-keepalive
主192.168.10.10
备192.168.10.40
web服务器
192.168.10.20----nginx
192.168.10.30----nginx
客户端访问任意一台
主192.168.10.10
yum -y install keepalived ipvsadm
vim /etc/keepalived/keepalived.conf
.............smtp_server 127.0.0.1router_id LVS_01vrrp_strict 注释掉interface ens33persistence_timeout 0virtual_ipaddress {192.168.10.99
}
修改上面的并删掉最后一个下面所有的内容并添加以下内容virtual_server 192.168.10.99 80 {delay_loop 6lb_algo rrlb_kind DRpersistence_timeout 0protocol TCPreal_server 192.168.10.20 80 {weight 1TCP_CHECK {connect_port 80connect_timeout 3nb_get_retry 3delay_before_retry 4}
}
real_server 192.168.10.30 80 {weight 1TCP_CHECK {connect_port 80connect_timeout 3nb_get_retry 3delay_before_retry 4}
}
}.............systemctl restart keepalived.service
systemctl restart ipvsadm.service
ipvsadm-save /etc/sysconfig/ipvsadm
systemctl restart ipvsadm.service
ipvsadm -ln
ipvsadm-save /etc/sysconfig/ipvsadm
systemctl restart ipvsadm.servicevim /etc/sysctl.conf
.....................net.ipv4.ip_forward 0
net.ipv4.conf.all.send_redirects 0
net.ipv4.conf.default.send_redirects 0
net.ipv4.conf.ens33.send_redirects 0.....................sysctl -p 立即加载
备192.168.10.40
yum -y install keepalived ipvsadm
vim /etc/keepalived/keepalived.conf
.............smtp_server 127.0.0.1router_id LVS_02priority 90vrrp_strict 注释掉state BACKUPinterface ens33persistence_timeout 0virtual_ipaddress {192.168.10.99
}
修改上面的并删掉最后一个下面所有的内容并添加以下内容virtual_server 192.168.10.99 80 {delay_loop 6lb_algo rrlb_kind DRpersistence_timeout 0protocol TCPreal_server 192.168.10.20 80 {weight 1TCP_CHECK {connect_port 80connect_timeout 3nb_get_retry 3delay_before_retry 4}
}
real_server 192.168.10.30 80 {weight 1TCP_CHECK {connect_port 80connect_timeout 3nb_get_retry 3delay_before_retry 4}
}
}.............systemctl restart keepalived.service
systemctl restart ipvsadm.service
ipvsadm-save /etc/sysconfig/ipvsadm
systemctl restart ipvsadm.service
ipvsadm -ln
ipvsadm-save /etc/sysconfig/ipvsadm
systemctl restart ipvsadm.servicevim /etc/sysctl.conf
.....................net.ipv4.ip_forward 0
net.ipv4.conf.all.send_redirects 0
net.ipv4.conf.default.send_redirects 0
net.ipv4.conf.ens33.send_redirects 0.....................sysctl -p 立即加载
web服务器
192.168.10.20
192.168.10.30
vim /etc/sysconfig/network-scripts/ifcfg-lo:0
.........................DEVICElo:0
IPADDR192.168.10.99
NETMASK255.255.255.255
ONBOOTyes.........................重启lo:0网卡
ifup ifcfg-lo:0 绑定vip
route add -host 192.168.10.99 dev lo:0vim /etc/sysctl.conf
...................net.ipv4.conf.lo.arp_ignore 1
net.ipv4.conf.lo.arp_announce 2
net.ipv4.conf.all.arp_ignore 1
net.ipv4.conf.all.arp_announce 2...................
sysctl -p
结果
停止主的
systemctl stop ipvsadm.service
systemctl stop keepalived.servicevip漂移到备服务器
ip addr 看页面访问服务正常 keepalive基于nginx高可用
主192.168.10.10--nginx
yum -y install keepalived
vim /etc/keepalived/keepalived.conf
...................
global_defs模块中smtp_server 127.0.0.1router_id LVS_01#vrrp_strict在global和vrrp_instance之间加
.......
vrrp_script check_nginx {script /opt/check_nginx.shinterval 5
}
.......vrrp_instance模块中virtual_ipaddress {192.168.10.99
}
vrrp_instance内最后加
track_script {check_nginx
}...................vrrp_instance模块后的都删除chmod 777 /opt/check_nginx.sh
systemctl restart keepalived.service
传递nginx的状态
vim /opt/check_nginx.sh#!/bin/bash
/usr/bin/curl -I http://localhost /dev/null
if [ $? -ne 0 ]
thensystemctl stop keepalived
fi
备192.168.10.20--nginx
yum -y install keepalived
vim /etc/keepalived/keepalived.conf
...................
global_defs模块中smtp_server 127.0.0.1router_id LVS_02#vrrp_strict在global和vrrp_instance之间加
.......
vrrp_script check_nginx {script /opt/check_nginx.shinterval 5
}
.......vrrp_instance模块中state BACKUP
priority 90
virtual_ipaddress {192.168.10.99
}
vrrp_instance内最后加
track_script {check_nginx
}...................vrrp_instance模块后的都删除chmod 777 /opt/check_nginx.sh
systemctl restart keepalived.service
传递nginx的状态
vim /opt/check_nginx.sh#!/bin/bash
/usr/bin/curl -I http://localhost /dev/null
if [ $? -ne 0 ]
thensystemctl stop keepalived
fi
结果 当主故障后切换到备主要恢复需要
主故障
systemctl stop nginx.service主恢复需要
systemctl restart nginx.service
systemctl restart keepalived.service
