Webman Configuration Guide for High Availability of Websites

Webman Configuration Guide for High Availability of Websites

Introduction:
In today's digital era, websites have become one of the important business channels for enterprises. In order to ensure the business continuity and user experience of enterprises and ensure that the website is always available, high availability has become a core requirement. Webman is a powerful web server management tool that provides a series of configuration options and functions that can help us achieve a high-availability website architecture. This article will introduce some Webman configuration guides and code examples to help you achieve high availability of your website.

1. Install and configure Webman

1. Install Webman
   First, we need to install Webman. You can download the latest version of the installation package from the Webman official website (https://webman.io/). Then follow the instructions in the installation package to install it.
2. Configuring Webman
   After the installation is complete, open the Webman configuration file, which is usually located at /etc/webman/webman.conf. In the configuration file, you can modify various parameters to suit your needs. The following are some common configuration items:

• Listening port: You can specify the port that Webman listens on by modifying the listen_address parameter.

Sample code:

listen_address = 0.0.0.0:8080

• Access control: You can specify the IP addresses allowed to access Webman by modifying the allow_ips parameter.

Sample code:

allow_ips = 192.168.1.0/24

• SSL configuration: If you need to enable SSL encrypted connections, you can configure ssl and ssl_certparameter.

Sample code:

ssl = true
ssl_cert = /path/to/certificate.pem

2. Configure load balancing

1. Install load balancer
   In order to achieve high availability, we can use load balancing server to distribute traffic to multiple web servers. Commonly used load balancers include Nginx, HAProxy, etc. You can choose a load balancer that suits your environment and follow its installation tutorial.
2. Configuring the load balancer
   In the load balancer configuration file, you need to specify Webman's backend server list and set the corresponding load balancing algorithm. The following is an example of Nginx load balancing configuration:

http {
    upstream backend {
        server 192.168.1.101:8080;
        server 192.168.1.102:8080;
        server 192.168.1.103:8080;
    }
    
    server {
        listen 80;
        
        location / {
            proxy_pass http://backend;
        }
    }
}

In the above example, we specify the list of Webman backend servers through the upstream directive, and then specify the list of Webman backend servers in the specific virtual host In the setup, use the proxy_pass directive to forward the request to the backend server.

3. Configure failover

In order to cope with server failure or maintenance, we need to implement a failover mechanism. When a Webman node is unavailable, traffic should be automatically transferred to other available nodes.

1. Use Keepalived to implement failover
   Keepalived is a commonly used tool to implement failover. It implements automatic backup and failover by using the VRRP protocol and health check. The following is an example of a Keepalived configuration:

global_defs {
    router_id LVS_DEVEL
}

vrrp_script check_webman {
    script "/opt/check_webman.sh"
    interval 2
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 155
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.1.100
    }
    track_script {
        check_webman
    }
}

In the above example, we define a script for checking the health of Webman through the vrrp_script directive, and then ## In the #vrrp_instance command, parameters such as virtual IP address and priority are set.

Enable automatic failover
2. In the Webman configuration file, we need to enable automatic failover. According to your needs, you can modify the following parameters according to the actual situation:
   

Enable health check: Set the health check interval by modifying the
• health_check_interval parameter.

Sample code:

health_check_interval = 5s

Set the maximum number of failovers: Set the maximum number of failovers by modifying the
• max_failover_attempts parameter.

Sample code:

max_failover_attempts = 3

Conclusion:

By properly configuring Webman, we can achieve high availability of the website. This article introduces the installation and configuration guide for Webman and gives some code examples to help implement load balancing and failover. I hope these configuration guidelines are helpful for you to implement a highly available website architecture.

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