centos docker .net core 2.2报错:
[2019-07-09 14:11:21 Error] Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware An unhandled exception has occurred while executing the request. System.TypeInitializationException: The type initializer for 'Gdip' threw an exception. ---> System.DllNotFoundException: Unable to load shared library 'libdl' or one of its dependencies. In order to help diagnose loading problems, consider setting the LD_DEBUG environment variable: liblibdl: cannot open shared object file: No such file or directory at Interop.Libdl.dlopen(String fileName, Int32 flag) at System.Drawing.SafeNativeMethods.Gdip.LoadNativeLibrary() at System.Drawing.SafeNativeMethods.Gdip..cctor() --- End of inner exception stack trace --- at System.Drawing.SafeNativeMethods.Gdip.GdipCreateBitmapFromScan0(Int32 width, Int32 height, Int32 stride, Int32 format, HandleRef scan0, IntPtr& bitmap) at System.Drawing.Bitmap..ctor(Int32 width, Int32 height, PixelFormat format) at Oshop.Services.Util.CaptchaUtil.GetCaptcha(String code) in /app/Oshop.Services/Util/CaptchaUtil.cs:line 32 at curseIS.STS.Identity.Quickstart.Account.AccountController.GetCaptcha() in /app/base/curseIS.STS.Identity/Quickstart/Account/AccountController.cs:line 118 at lambda_method(Closure , Object ) at Microsoft.Extensions.Internal.ObjectMethodExecutorAwaitable.Awaiter.GetResult() at Microsoft.AspNetCore.Mvc.Internal.ActionMethodExecutor.TaskOfActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments) at System.Threading.Tasks.ValueTask`1.get_Result() at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeActionMethodAsync() at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeNextActionFilterAsync() at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ActionExecutedContext context) at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted) at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeInnerFilterAsync() at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter() at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context) at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted) at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync() at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync() at Microsoft.AspNetCore.Routing.EndpointMiddleware.Invoke(HttpContext httpContext) at Microsoft.AspNetCore.Routing.EndpointRoutingMiddleware.Invoke(HttpContext httpContext) at Microsoft.AspNetCore.Localization.RequestLocalizationMiddleware.Invoke(HttpContext context) at IdentityServer4.Hosting.IdentityServerMiddleware.Invoke(HttpContext context, IEndpointRouter router, IUserSession session, IEventService events) at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context) at IdentityServer4.Hosting.BaseUrlMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware.Invoke(HttpContext context)
项目使用了.net core下的Bitmap, 用来生成用户注册验证码, 使用的是如下dll:
using System.Drawing; using System.Drawing.Imaging;
在win10上确实正常使用没有问题, 在centos上用linux部署之后, 就一直报上面的错误.
有参考这些资料:
https://www.cnblogs.com/stulzq/p/10172550.html
https://www.cnblogs.com/stulzq/p/9339250.html
按步骤改了apt-get的源:
但是这样改后会报别的错:
The repository 'http://mirrors.163.com/debian jessie-backports Release' does not have a Release file
然后才在这发现:
debian 8.几才用 jessie, 而.net core 2.2(我使用的版本), 使用的docker image是debian 9.9, 这样查看:
radhat或centos存在：/etc/redhat-release 这个文件 debian或ubuntu 存在 /etc/debian_version 这个文件 Slackware存在 /etc/slackware_version 这个文件 ubuntu存在 /etc/lsb-release 这个文件
所以应该用stretch这块的源:
deb http://mirrors.aliyun.com/debian/ stretch main non-free contrib deb-src http://mirrors.aliyun.com/debian/ stretch main non-free contrib deb http://mirrors.aliyun.com/debian-security stretch/updates main deb-src http://mirrors.aliyun.com/debian-security stretch/updates main deb http://mirrors.aliyun.com/debian/ stretch-updates main non-free contrib deb-src http://mirrors.aliyun.com/debian/ stretch-updates main non-free contrib deb http://mirrors.aliyun.com/debian/ stretch-backports main non-free contrib deb-src http://mirrors.aliyun.com/debian/ stretch-backports main non-free contrib
不管怎样, 改成这个源之后, 确实就可以了, 正常build 镜像, 正常run起来, 正常的生成了验证码图片, 惟一的别的事, 就是, 同一份代码, 跑在win10上和linux docker里, 生成的图片字体风格有差异:
centos docker:
win10: 
可以看出字母 y 还是有些不一样, 不过, 这些小细节就不管那么多了.