3534. Accessing Website Hosted in Docker of VirtualBox from Another Machine
Docker, OpenGrok, and VirtualBox

Introduce how to access website hosted in docker of virtual machine from another machine.

1. VirtualBox + Docker

I’m assigned a task to find out how many customers have configured some specific validation rules in their production environment. What I have are the customization files fetched from server, they are in XML format. My idea is to use OpenGrok for search. Before using OpenGrok, we need to import these files to it. To make it reusable, I decide to setup OpenGrok in docker.


  • 1) Install VirtualBox on RedHat machine. RedHat is the host machine.
  • 2) Install Ubuntu on VirtualBox. Ubuntu is the guest machine.
  • 3) Create share folder between host and guest machine.
  • 4) Install Docker in Ubuntu VM.
  • 5) Create OpenGrok container.
  • 6) Access OpenGrok from host machine.
  • 7) Access OpenGrok from another machine.

2. Installation

2.1 Installing VirtualBox

Download proper VirtualBox for RedHat from https://www.virtualbox.org/wiki/Downloads. Then, install VirtualBox

sudo yum install VirtualBox-5.2-5.2.10_122088_el7-1.x86_64.rpm

Add yourself to the vboxusers group using the “Users and Groups” application or the command line:

sudo usermod -a -G vboxusers [your_user_name]

2.2 Installing Ubuntu VM

Go to https://ubuntu.com/#download to download Ubuntu Desktop. Refer to Installing VirtualBox and Creating Ubuntu VM to install Ubuntu in virtual machine.

2.3 Creating Sharing Folder

First, create shared folder in host machine. Second, install VirtualBox Guest Additions for the Ubuntu VM. Devices -> Insert Guest Additions CD images.. image Then, refer to Sharing Files between Host and Guest in VirtualBox to connect the shared folder in host machine to guest machine. Finally, the shared folder in RedHat locates in


The shared folder in Ubuntu VM locates in


2.4 Installing Docker in Ubuntu VM

Refer to Installing and Using Docker on Ubuntu to install Docker.

2.5 Creating OpenGrok Container

Create two directories in the shared folder. Put the xml files into the src folder.

$ mkdir -p /opengrok/src /opengrok/data
  • src - Contains your source files.
  • data - Used by OpenGrok. OpenGrok will generate indexes for the source files and store them here.

Download OpenGrok Docker Image

docker pull scue/docker-opengrok

Run a Docker container and mount these two directories: src and data; this will automatically run indexing as a part of startup.

$ docker run --name=opengrok-cus1 -v /opengrok/src:/src -v /opengrok/data:/data -p 31030:8080 scue/docker-opengrok

The OpenGrok application is now running on http://localhost:31030/source/ image

2.6 Accessing OpenGrok from Host Machine

Stop Ubuntu VM, then click Settings, switch to Network. It already has the NAT Network Adapter in Adapter 1. image Switch to Adapter 2 tab, enable Bridged Adapter. image Restart the Ubuntu VM. Go to Network to get the IP address for bridged adapter. image Start the OpenGrok from docker. You may first need to delete the existing container created previously.

Show all existing containers.

docker ps -a

Remove one particular container with id.

docker rm [container id]

The OpenGrok application can be accessed through image With the IP address, we can also access OpenGrok from host machine(RedHat). image

2.7 Access OpenGrok from Another Machine

Stop Ubuntu VM, then click Settings, switch to Network. In NAT Network Adapter, click ‘Port Forwarding’ button. Setup Port Forwarding rule. is the public IP address of the host machine. The following rule means, the request to will be forwarded to image

Finally, the OpenGrok application can be accessed through from another machine. image

3. References