Lvs+keepalived for high-availability web load Balancing

Topology diagram

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Installing keepalived

[email protected] ~]# Yum install-y keepalived

Modify Keepalived MASTER configuration file

[[email protected] ~]# vim /etc/keepalived/keepalived.conf ! configuration  file for keepalived global_defs {   notification_email {      [email protected]     [email protected]      [email protected]   }   notification_email_from [email  protected]   router_id LVS_DEVEL} vrrp_instance VI_1 {     state master  # #定义主节点     interface eth0      virtual_router_id 51  # #识别虚拟路由的id, the same ID will be identified as 1 groups     priority  100  # #优先级, high priority will be elected as the main node     advert_int 1     authentication {        auth_type pass   ## The authentication method is pass  and ah  &Nbsp;     auth_pass 1111    }    virtual _ipaddress {        172.16.30.100   # #vip即虚拟IP         }} virtual_server 172.16.30.100 80 {     delay_loop 6    lb_algo rr   # #调度模式rr, polling      lb_kind dr   # #负载均衡模型为DR    also nat     persistence_timeout 0   # #超时时长, the time spent on each node, set here to 0, the default is 50s, will stay on a single node for 50 seconds on the other node      protocol TCP     real_server 172.16.30.10 80 {       # #后端rs主机         weight 1         TCP_CHECK {                  connect_port 80   # #连接端口              connect_timeout 3  # #连接超时时间              nb_get_retry 3   # #重试次数              delay_before_retry 3   # #每次重试之间的间隔时间          } real_server 172.16.30.11 80 {         weight 1        TCP_CHECK {                 connect_port 80             connect_timeout 3             nb_get_retry 3             delay_before_retry 3        }    } }

To copy a configuration file to another node

[Email protected] ~]# scp/etc/keepalived/keepalived.conf172.16.30.2:/etc/keepalived/keepalived.conf

Modify State priority as

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Start keepalived Test VIP

Master IP, stop the master keepalived service

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BACKUP IP

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VIP Successful Transfer

Configure the Web server

Installing httpd

[email protected] ~]# Yum install-y httpd

Provide Web page files

[Email protected] ~]# vim/var/www/html/index.html

Node11 the same operation
Configuring the RS Model
[[email protected] ~]# echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore     # #关闭arp转发 [[Email protected] ~]# echo 1 > /proc/sys/net/ipv4 /conf/all/arp_ignore[[email protected] ~]# echo 2 > /proc/sys/net/ipv4/conf/ All/arp_announce [[email protected] ~]# echo 2 > /proc/sys/net/ipv4/conf /lo/arp_announce [[email protected] ~]# ifconfig lo:0 172.16.30.100 netmask  255.255.255.255 broadcast 172.16.30.100 up # #在lo: 0 Port set vip  and broadcast only to yourself [[email  protected] ~]# ifconfig eth0      link encap:ethernet   HWaddr 08:00:27:02:A7:9A             inet addr:172.16.30.10  bcast:172.16.255.255  mask:255.255.0.0           inet6 addr: fe80::a00:27ff:fe02:a79a/64 Scope:Link           UP BROADCAST RUNNING MULTICAST  MTU:1500   metric:1          rx packets:5319 errors:0  dropped:0 overruns:0 frame:0          tx  packets:685 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:1000            RX bytes:485435  (474.0 kib)   TX bytes:55938  (54.6  kib)  lo        Link encap:Local Loopback             inet addr:127.0.0.1  mask : 255.0.0.0          inet6 addr: ::1/128 scope:host           UP LOOPBACK RUNNING  MTU:65536  Metric:1           RX packets:0 errors:0 dropped:0  overruns:0 frame:0          tx packets:0  errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:0           RX  bytes:0  (0.0 b)   TX bytes:0  (0.0 b)  lo:0       Link encap:Local Loopback             inet addr:172.16.30.100  Mask:255.255.255.255           up loopbacK running  mtu:65536  metric:1 

Node11 same operation
Start the HTTPD service separately
Access test
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Now stop the keepalived service on Node1.
Another visit or the same result, let's see if the IP,VIP on Node2 has been transferred.
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This enables high-availability load balancing of the lvs+keepalived, which is responsible for load balancing of the Web server, while keepalived guarantees that the LVS will not have a single point of failure.

This article is from the "Linuxu" blog, make sure to keep this source http://linuxu.blog.51cto.com/9471357/1613488
Lvs+keepalived for high-availability web load Balancing