ACL configuration based on proxy IP in Nginx reverse proxy

In Nginx reverse proxy, ACL (Access Control List) is a very practical function used to control access rights of different IP addresses or request sources. For some situations where different proxy IPs need to be distinguished, ACL configuration based on proxy IP becomes a necessary operation.

The following will introduce the specific implementation of ACL configuration based on proxy IP.

1. Determine the proxy IP that needs to be configured

Before configuring the ACL based on the proxy IP, you first need to determine the proxy IP that needs to be controlled. There are two common control objects, one is the IP address of different agents, and the other is different IP addresses of the same agent.

For the first case, you can obtain the proxy IP information by viewing Nginx's access.log log file or through other tools, and then configure ACL for different proxy IPs. For the second case, it should be noted that in some cases, the proxy IP may change, so this issue needs to be taken into account in the ACL configuration.

2. Configure ACL based on proxy IP

After confirming the proxy IP that needs to be configured, the next step is to perform the actual ACL configuration. The specific steps are as follows:

1. Define a variable in the Nginx configuration file

Define a variable in the Nginx configuration file to store the proxy IP information. In this variable, you can use a regular expression to match the proxy IP address that needs to be filtered.

For example, in the following example, we define a variable named $proxy_ip to store the proxy IP address that needs to be filtered:

http {

    ...

    # 定义代理IP变量
    geo $proxy_ip {
        default "";
        10.0.0.1/24 1;
        10.1.0.1/24 1;
        ...
    }

    ...
}

In the above example, we use The geo directive defines the $proxy_ip variable and uses the default value default "". Subsequently, we set a weight value of 1 for the proxy IP address that needs to be filtered in the IP/mask format. When the proxy IP address matches this variable, it will be filtered according to the weight value.

2. Add ACL configuration

After defining the proxy IP variable, the next step is to add ACL configuration. ACL configuration can be defined using the if directive, for example:

http {

    ...

    # 添加ACL配置
    if ($proxy_ip) {
        return 403;
    }

    ...
}

In the above example, we used the if directive to determine whether the $proxy_ip variable exists. If it exists, a 403 status code is returned. Corresponding processing operations can also be performed according to needs.

3. Notes

When configuring ACL based on proxy IP, you need to pay attention to the following aspects:

1. Try to avoid configuring too many proxy IPs address to avoid affecting the performance and efficiency of Nginx.
2. Regularly check the changes of proxy IP to ensure the accuracy of ACL configuration.
3. Set an appropriate weight value for the proxy IP for priority control.
4. After configuring the ACL, you can monitor and adjust it according to the actual situation so that problems can be discovered and solved in a timely manner.

In general, ACL configuration based on proxy IP is a very practical function that can effectively improve the security and stability of Nginx reverse proxy. As long as you pay attention to the above precautions, you can easily implement the ACL configuration function.

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