.net core 报错 the configured user limit (128) on the number of inotify instances has been reached

部署一个asp.net core程序，用着用着占用线程数越来越多，看报错日志发现这么一行：the configured user limit (128) on the number of inotify instances has been reached。

谷歌查到Stackoverflow上也有人遇到这个问题，原来是读取json文件造成的。

var builder = new ConfigurationBuilder()
            .AddJsonFile($"appsettings.json", true, true)
            .AddJsonFile($"appsettings.{environmentName}.json", true, true)
            .AddEnvironmentVariables();
        var configuration = builder.Build();

原因是：You are creating file watchers, every time you access an setting. The 3rd parameter is reloadOnChange.

大意是创建了一个文件监视器，由于第三个参数设为true，导致每次请求都要新开一个线程来读取文件。解决办法是将第三个参数设置为false，不过貌似不是最理想的解决办法，最好的办法人家给出了：

Best way is to abstract hat behind an interface and use dependency injection.

public interface IConfigurationManager
{
    T GetAppConfig<T>(string key, T defaultValue = default(T));
}

public class ConfigurationManager : IConfigurationManager
{
    private readonly IConfigurationRoot config;

    public ConfigurationManager(IConfigurationRoot config)
        => this.config ?? throw new ArgumentNullException(nameof(config));

    public T GetAppConfig<T>(string key, T defaultValue = default(T))
    {
        T setting = (T)Convert.ChangeType(configuration[key], typeof(T));
        value = setting;
        if (setting == null)
            value = defaultValue;
    }
}

Then instantiate and register it

services.AddSingleton<IConfigurationManager>(new ConfigurationManager(this.Configuration));

and inject it into your services via constructor