public partial class PaintingLineDbContext : DbContext
    {
        // 輸出到Console
        public static readonly LoggerFactory LoggerFactory =
            new LoggerFactory(new[] { new ConsoleLoggerProvider((_, __) => true, true) });

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            
 
base.OnConfiguring(optionsBuilder);

            var env = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");
            if (env == "Development")
            {
                optionsBuilder.UseLoggerFactory(LoggerFactory);
            }
        }

    }

supervisor配置檔案：api.ini

[program:api]
command
 
=dotnet21 OpenAuth.PaintLine.WebApi.dll
directory=/app/api
environment=ASPNETCORE__ENVIRONMENT=Production
user=root
stopsignal=INT
autostart=true
autorestart=true
startsecs=1
stderr_logfile=/var/log/api.err.log
stdout_logfile=/var/log/api.out.log

.net core 2.1 + keepalived部署的時候，一直在往/var/log/api.out.log寫檔案，經過排查發現：

不知道哪位大哥加了這麼一段程式碼optionsBuilder.UseLoggerFactory(LoggerFactory);，導致entityframework大量輸出日誌級別為debug和info的資訊，進而導致supervisor一直疲於往檔案寫日誌。然後我的伺服器CPU就爆滿了。