![]() ![]() install Wireshark for packet capture and analysis from inside GNS3.install software required by GNS3 and related software.build the image starting from the latest version of Ubuntu (14.04) officially available on the Docker Registry.The Docker file is available on the GitHub repository for the gns3-large project and contains instructions to I called the container gns3-large, because it is quite fat, it contains everything needed to build some software included in the image. ![]() If you need persistence you have to explicitly declare persistent volumes (folders) on the Dockerfile or you have to explicitly mount a folder, on the host, on a folder, in the docker image, when you start the docker image ( -v option) in our case we explicitly mount the user’s entire home directory inside same directory in the docker image. On the host you see the processe(s) running in a docker container as normal processes.Īnother important feature of docker containers is that when they stop nothing is saved so that when they restart it is as if you are starting a new fresh image. ![]() The huge advantage of Docker containers against virtual machines is that they spin-up in milliseconds instead of tens of seconds and, because they share same kernel, don’t have to simulate the entire operating system, so they are much more efficient in terms of host resource usage. ![]() GNS3 is available on Windows, Mac OSX and on Linux, but it shines on Linux because, to use IOU, if you are not on Linux you need a Linux virtual machine running on VirtualBox.īut, because GNS3 glues together many moving parts, it can be troublesome to install everything and to have everything working seamlessly, for this reason i created a Docker image with everything installed, functioning and ready to be used on Linux (or in a Linux virtual machine running in Windows or Mac OSX).ĭocker is another fantastic piece of software that, together with CoreOS and other cloud orchestration projects, like Google’s Kubernetes, is one of the building blocks for the incoming Cloud Revolution.ĭocker containers (or Docker images) have similarities with virtual machines, but they run on same Linux kernel as the host, in a “ chrooted” environment using Cgroups and namespace isolation to provide resource limitation (on cpu and or RAM usage) and isolation from the other host processes that are invisible inside the Docker container. It also allows to connect the virtual network to the physical network, it is possible to access Internet in the emulated world and vice-versa. GNS3 is a fantastic piece of software, it glues together different open source software and allows to emulate a network that includes Cisco routers (using real Cisco firmware), Cisco switches (using IOU, Cisco IOS on Unix), Cisco ASA and any other devices that can run on Qemu or Virtual Box emulator. ![]()
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