How to configure high-availability network load balancing on Linux

How to configure high-availability network load balancing on Linux

Network load balancing is an important network technology that can evenly distribute network traffic to multiple servers to improve system availability and expansion. sex. On Linux systems, high-availability network load balancing can be easily achieved through some tools and technologies. This article explains how to configure high-availability network load balancing on a Linux system and provides code examples.

1. Configuring Keepalived

Keepalived is an open source high-availability solution that can achieve server failover and load balancing. Here are the steps to configure Keepalived:

1. Install Keepalived:

   Install Keepalived using the following command on a Linux system:

   $ sudo apt-get install keepalived

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2. Configure Keepalived:

   Open the Keepalived configuration file, usually located at /etc/keepalived/keepalived.conf, and configure it according to the following example:

   ! Configuration File for keepalived
   
   vrrp_instance VI_1 {
       state MASTER
       interface eth0
       virtual_router_id 51
       priority 100
       advert_int 1
       authentication {
           auth_type PASS
           auth_pass mypassword
       }
       virtual_ipaddress {
           192.168.0.100/24
       }
   }

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   In the above configuration , state MASTER indicates that the current server is the master node, interface eth0 indicates the network interface, virtual_router_id 51 is the ID of the virtual router, priority 100 is the priority, advert_int 1 is the advertising interval, auth_pass mypassword is the authentication password, virtual_ipaddress is the virtual IP address.

   Similarly, other servers can also be configured as backup nodes.

3. Start Keepalived:

   Use the following command to start the Keepalived service:

   $ sudo service keepalived start

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2. Configure LVS

LVS (Linux Virtual Server) is an open source network load balancer that distributes network traffic to multiple backend servers. The following are the steps to configure LVS:

1. Install LVS:

   Use the following command to install LVS on a Linux system:

   $ sudo apt-get install ipvsadm

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2. Configure LVS:

   Use the following command to configure LVS:

   $ sudo ipvsadm -A -t 192.168.0.100:80 -s rr
   
   $ sudo ipvsadm -a -t 192.168.0.100:80 -r 192.168.0.101 -g
   $ sudo ipvsadm -a -t 192.168.0.100:80 -r 192.168.0.102 -g

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   In the above command, -A means adding a virtual server, -t means virtual The address and port of the server, -s rr means using the polling algorithm for load balancing, -a means adding a back-end server, -r means the back-end server Address and port, -g indicates that the backend server exists in the form of a group.

   Multiple virtual servers and back-end servers can be configured according to actual needs.

3. Start LVS:

   Use the following command to start the LVS service:

   $ sudo service ipvsadm start

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The above is to configure high availability on the Linux system Simple example of network load balancing. Through the configuration of Keepalived and LVS, server failover and load balancing can be achieved, improving system availability and performance.

Please note that the configuration and commands in the example are based on the Ubuntu operating system and may be slightly different for other Linux distributions. In actual use, please configure accordingly according to your own system and needs.

I hope this article will help you understand how to configure high-availability network load balancing on Linux. If you have any questions, please feel free to ask.

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