k8sviz

k8sviz is a tool to generate Kubernetes architecture diagrams from the actual state in a namespace. Currently, this only generates a diagram similar to https://github.com/kubernetes/community/tree/master/icons#usage-example by using graphviz. For examples of the generated diagrams, see Examples below.

Implementations

There are two implementations, bash script version and go version. Bash script version is just a wrapper to run go version inside container.

Prerequisites

Bash script version

k8sviz.sh requires:

• bash
• getopt
• docker

To build a container image (optional), it requires:

• make

Go version

k8sviz requires:

• dot (graphviz) command

To build binary, it requires:

• make
• go

Version compatibility matrix

k8sviz version	k8s 1.20 or earlier	k8s 1.21 or later
k8sviz 0.3.2 or earlier	Yes	No
k8sviz 0.3.3 or later	No	Yes

Installation

Bash script version

Just download k8sviz.sh file and add execute permission.

$ curl -LO https://raw.githubusercontent.com/mkimuram/k8sviz/master/k8sviz.sh
$ chmod u+x k8sviz.sh

Go version

Build the binary with below commands:

$ git clone https://github.com/mkimuram/k8sviz.git
$ cd k8sviz
$ make build

icons directory needs to be in the same directory to the k8sviz binary. So, move them to the proper directory (Replace PATH_TO_INSTALL as you like).

$ PATH_TO_INSTALL=$HOME/bin
$ cp bin/k8sviz ${PATH_TO_INSTALL}
$ cp -r icons ${PATH_TO_INSTALL}

Usage

Bash script version

$ ./k8sviz.sh --help
USAGE: ./k8sviz.sh [flags] args
flags:
  -n,--namespace:  The namespace to visualize. (default: 'default')
  -o,--outfile:  The filename to output. (default: 'k8sviz.out')
  -t,--type:  The type of output. (default: 'dot')
  -k,--kubeconfig:  Path to kubeconfig file. (default: '/home/user1/.kube/config')
  -i,--image:  Image name of the container. (default: 'mkimuram/k8sviz:0.3')
  -h,--help:  show this help (default: false)

• ⚠️ WARNING

  If you are using Mac, only short options can be used. If you would like to use long options, you can install gnu-getopt and enable it by defining FLAGS_GETOPT_CMD environment variable.

   $ brew install gnu-getopt
   $ export FLAGS_GETOPT_CMD=/usr/local/opt/gnu-getopt/bin/getopt
   $ ./k8sviz.sh -h

• 📝NOTE

  If you can't pull the container image or need to build it by yourself, you can do it by make image-build. It would be helpful if you specify DEVEL_IMAGE and DEVEL_TAG to make the image name the same to the default one (Below example will set image name like mkimuram/k8sviz:0.3.4).

   $ DEVEL_IMAGE=mkimuram/k8sviz DEVEL_TAG=$(cat version.txt) make image-build

  An example use case of creating custom image is to include AWS SDK or Google Cloud SDK. To create a custom image that include AWS SDK, run below command:

   $ DEVEL_IMAGE=mkimuram/k8sviz DEVEL_TAG=$(cat version.txt) TARGET=aws make image-build

  To create a custom image that include Google Cloud SDK, run below command:

   $ DEVEL_IMAGE=mkimuram/k8sviz DEVEL_TAG=$(cat version.txt) TARGET=gcloud make image-build

Go version

$ ./k8sviz -h
Usage of ./k8sviz:
  -kubeconfig string
        absolute path to the kubeconfig file (default "/home/user1/.kube/config")
  -n string
        namespace to visualize (shorthand) (default "default")
  -namespace string
        namespace to visualize (default "default")
  -o string
        output filename (shorthand) (default "k8sviz.out")
  -outfile string
        output filename (default "k8sviz.out")
  -t string
        type of output (shorthand) (default "dot")
  -type string
        type of output (default "dot")

Examples

Examples are only shown for old bash script version, but current go version should work in the same way.

Examples for tutorial deployments in default namespace

• Generate dot file for namespace default

    ./k8sviz.sh -n default -o default.dot

• Generate png file for namespace default

   $ ./k8sviz.sh -n default -t png -o default.png

• Output for an example wordpress deployment will be like below:
  • default.dot
  • default.png:

• Output for an example cassandra deployment with statefulset will be like below:
  • default.dot
  • default.png:

Examples for more complex deployment (kubeflow case)

• Generate dot file for namespace kubeflow and istio-system

   $ ./k8sviz.sh -n kubeflow -o examples/kubeflow/kubeflow.dot
   $ ./k8sviz.sh -n istio-system -o examples/kubeflow/istio-system.dot

• Generate png file for namespace kubeflow and istio-system

   $ ./k8sviz.sh -n kubeflow -t png -o examples/kubeflow/kubeflow.png
   $ ./k8sviz.sh -n istio-system -t png -o examples/kubeflow/istio-system.png

• Output:

  • kubeflow.dot
  • istio-system.dot
  • kubeflow.png

  

  • istio-system.png

  

License

This project is licensed under the Apache License - see the LICENSE file for details