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On my local machine Windows 10 (64 bit) I start docker Toolbox. Then I pull Tomcat image and run it like this:

docker run -it tomcat

It's success run.

31-Dec-2019 17:54:27.598 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/usr/local/tomcat/webapps/ROOT]
31-Dec-2019 17:54:28.849 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/usr/local/tomcat/webapps/ROOT] has finished in [1,246] ms
31-Dec-2019 17:54:28.851 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/usr/local/tomcat/webapps/host-manager]
31-Dec-2019 17:54:29.029 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/usr/local/tomcat/webapps/host-manager] has finished in [178] ms
31-Dec-2019 17:54:29.031 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/usr/local/tomcat/webapps/docs]
31-Dec-2019 17:54:29.128 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/usr/local/tomcat/webapps/docs] has finished in [90] ms
31-Dec-2019 17:54:29.129 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/usr/local/tomcat/webapps/manager]
31-Dec-2019 17:54:29.251 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/usr/local/tomcat/webapps/manager] has finished in [122] ms
31-Dec-2019 17:54:29.254 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/usr/local/tomcat/webapps/examples]
31-Dec-2019 17:54:30.480 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/usr/local/tomcat/webapps/examples] has finished in [1,226] ms
31-Dec-2019 17:54:30.499 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["http-nio-8080"]
31-Dec-2019 17:54:30.592 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["ajp-nio-8009"]
31-Dec-2019 17:54:30.621 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in 3185 ms

But when I open my browser and input 

http://127.0.0.1:8080/

But page not found

Why?

Alexei
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    (a) Because you don't have a `docker run -p` option; (b) since you're on Docker Toolbox, you need the `docker-machine ip` address, usually 192.168.99.100, and not `localhost`. – David Maze Dec 31 '19 at 18:33

1 Answers1

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@DavidMaze is right: there are simultaneously several issues (at least two, maybe more, see below) in the situation you describe, and each issue individually prevents a browser on the Windows host from accessing the web application deployed in the Docker container:

  1. The web application needs to listen to the 0.0.0.0 special IP address (not localhost).
  2. The -p (--publish) option of docker run is required. Let's say the web-app listens for port 8080, then to publish this exposed port to the 80 port on the host: docker run -p 80:8080 […] (but the two ports can be the same)
  3. Finally as you use Docker Toolbox on Windows, you need to identify the Docker Machine IP where the web-app will be available (not localhost): if this information is not directly displayed by Docker Toolbox at startup, you may want to run: docker-machine ip dev.

For more details

ErikMD
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    1. docker-machine ip -> 192.168.99.100, 2. docker run -it -p 1234:8080 tomcat, 3.Open page on 192.168.99.100:1234. And now page open success – Alexei Jan 04 '20 at 08:27