如何创建浮动IP并使用它来配置HAProxy [英] How to create Floating IP and use it to configure HAProxy

问题描述

我最近尝试使用HAProxy负载平衡我的应用程序，并能够成功完成它.后来，我遇到了一个称为浮动IP"的概念，该概念可以与keepalived一起使用，以使负载均衡器高度可用.但是，我无法理解如何创建浮动IP.如何创建浮动IP并使用它来配置HAProxy? 谢谢.

I have recently tried to load balance my application using HAProxy and was able to do it successfully. Later, I have come across a concept called Floating IP, which can be used along with keepalived to make the load balancer highly available. I wasn't able to understand how to create the floating Ip though. How can I create Floating IP and use it to configure HAProxy? Thanks.

推荐答案

假设:

• 这适用于Ubuntu 14.04
• haproxy-primary IP:198.51.100.10
• haproxy-secondary IP:198.51.100.20
• 共享IP:198.51.100.50
• 任何DNS规则都应指向共享IP(198.51.100.50)

步骤:

1. 为keepalived添加防火墙规则#224.0.0.18是keepalived多播地址

1. Add a firewall rule for keepalived # 224.0.0.18 is the keepalived multicast address

1. sudo ufw allow in from 198.51.100.20 to 224.0.0.18#on 198.51.100.10
2. sudo ufw allow in from 198.51.100.10 to 224.0.0.18#on 198.51.100.20

1. sudo ufw allow in from 198.51.100.20 to 224.0.0.18 # on 198.51.100.10
2. sudo ufw allow in from 198.51.100.10 to 224.0.0.18 # on 198.51.100.20

允许访问共享的IP地址

Allow access to a shared IP address

1. 编辑/etc/sysctl.conf
2. 设置net.ipv4.ip_nonlocal_bind=1
3. sudo sysctl -p#重新加载配置更改

1. edit /etc/sysctl.conf
2. set net.ipv4.ip_nonlocal_bind=1
3. sudo sysctl -p # reload config change

安装keepalived

Install keepalived

1. sudo apt-get install keepalived

在两台服务器上配置keepalived

Configure keepalived on both servers

1. 编辑/创建/etc/keepalived/keepalived.conf
2. 请参阅下面的示例文件#主服务器和次服务器上的优先级必须不同！

重新启动keepalived

Restart keepalived

1. sudo服务keepalived重新启动

收听共享的IP地址

Listen on the shared IP address

1. 编辑/etc/haproxy/haproxy.cfg
2. bind 198.51.100.50:80

1. Edit /etc/haproxy/haproxy.cfg
2. bind 198.51.100.50:80

重新启动haproxy(在两个haproxy服务器上)

Restart haproxy (on both haproxy servers)

1. sudo service haproxy restart

验证正确的故障转移

Verify proper failover

1. 主要:sudo ip addr show | grep eth0#应列出共享IP
2. 第二:sudo ip addr show | grep eth0#不应列出共享IP
3. 主要:sudo service haproxy stop
4. 主要:sudo ip addr show | grep eth0#不应列出共享IP
5. 第二:sudo ip addr show | grep eth0#应该列出共享的IP
6. 主要:sudo service haproxy start
7. 主要:sudo ip addr show | grep eth0#应列出共享IP
8. 第二:sudo ip addr show | grep eth0#不应列出共享IP

1. primary: sudo ip addr show | grep eth0 # should list the shared IP
2. secondary: sudo ip addr show | grep eth0 # should NOT list the shared IP
3. primary: sudo service haproxy stop
4. primary: sudo ip addr show | grep eth0 # should NOT list the shared IP
5. secondary: sudo ip addr show | grep eth0 # should list the shared IP
6. primary: sudo service haproxy start
7. primary: sudo ip addr show | grep eth0 # should list the shared IP
8. secondary: sudo ip addr show | grep eth0 # should NOT list the shared IP

/etc/keepalived/keepalived.conf

     vrrp_script chk_haproxy {      # Requires keepalived-1.1.13
       script "killall -0 haproxy"  # cheaper than pidof
       interval 2 # check every 2 seconds
       weight 2 # add 2 points of priority if OK
     }
     vrrp_instance VI_1 {
       interface eth0
       state MASTER
       virtual_router_id 51
       priority 101 # 101 on primary, 100 on secondary
       virtual_ipaddress {
         198.51.100.50
       }
       track_script {
         chk_haproxy
       }
     }

这篇关于如何创建浮动IP并使用它来配置HAProxy的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！