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这相当于运行以下命令，但在upstart下：
默认情况下，docker logs或docker service logs显示命令的输出，就像在终端中以交互方式运行命令时所显示的一样。Unix和Linux命令通常在运行时打开三个I/O流，称为STDIN，，，STDOUT，和STDERR...STDIN是逗号的输入流，它可以包括来自键盘的输入或来自另一个命令的输入。STDOUT通常是命令的正常输出，并且STDERR通常用于输出错误消息。默认情况下，docker logs显示命令的STDOUT和STDERR.若要阅读有关I/O和Linux的更多信息，请参见Linux文档项目关于I/O重定向的文章...
在某些情况下，docker logs除非您采取其他步骤，否则可能不会显示有用的信息。
如果您使用测井驱动器它将日志发送到文件、外部主机、数据库或另一个日志后端，
docker logs可能无法显示有用的信息。
如果映像运行一个非交互式进程，如web服务器或数据库，则应用程序可以将其输出发送到日志文件而不是日志文件。
STDOUT和STDERR...
在第一种情况下，您的日志以其他方式处理，您可以选择不使用docker logs在第二种情况下，nginx图像显示了一个解决方案，以及正式的apache。httpd图像显示另一个。
官员nginx图像创建一个符号链接。/var/log/nginx/access.log到/dev/stdout，并创建另一个符号链接。/var/log/nginx/error.log到/dev/stderr，在此过程中覆盖先前的设备。见Dockerfile...
官员httpd驱动程序更改httpd应用程序的配置，将其正常输出直接写入/proc/self/fd/1%28STDOUT%29及其错误/proc/self/fd/2%28STDERR29%。见Dockerfile...
下一步
了解如何使用自定义测井驱动程序...
学习如何编写Dockerfile...