armada

Armada

Armada is a tool for creating multiple k8s clusters with kind (k8s in docker). This tool relies heavily on kind and extends its functionality with automation to create clusters tailored for multi cluster/multi cni local development and testing.

Prerequisites

• go 1.12 with $GOPATH configured
• docker

Get the latest version from Releases page.

Build the tool locally.

make build

Build in docker.

make docker-build

The armada binary will be placed under local ./bin directory.

Create clusters

In order to run more then 3 clusters, the following limits must be increased:

echo fs.file-max=500000 | sudo tee -a /etc/sysctl.conf                                                                      
echo fs.inotify.max_user_instances=8192 | sudo tee -a /etc/sysctl.conf
echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf
sudo sysctl -p 

The tool will create 2 clusters by default with kindnet cni plugin.

cd ./bin
./armada create clusters

This command will create five clusters with default kindnet cni.

./armada create clusters -n 5

Create a total of four clusters, 2 with weave, one with flannel and one with calico.

./armada create clusters --weave
./armada create clusters -n 3 --flannel
./armada create clusters -n 4 --calico

Default kubernetes node image is kindest/node:v1.16.3. To use different image use -i or --image flag. This command will create three clusters with flannel cni and kubernetes 1.15.6.

./armada create clusters -n 3 --flannel --image kindest/node:v1.15.6

Full list of supported images can be found on kind release page.

Example of running four clusters with multiple k8s versions and different cni plugins.

./armada create clusters -n 2 --weave  # 2 clusters with weave, k8s version 1.16.3
./armada create clusters -n 3 --flannel --image kindest/node:v1.15.6 # one clusters with flannel cni, k8s version 1.15.6
./armada create clusters -n 4 --calico --image kindest/node:v1.14.9 # one clusters with calico cni, k8s version 1.14.9

Create clusters command full usage.

./armada create clusters -h
Creates multiple kubernetes clusters using Docker container 'nodes'

Usage:
  armada create clusters [flags]

Flags:
  -c, --calico          deploy with calico
  -v, --debug           set log level to debug
  -f, --flannel         deploy with flannel
  -h, --help            help for clusters
  -i, --image string    node docker image to use for booting the cluster
  -k, --kindnet         deploy with kindnet default cni (default true)
  -n, --num int         number of clusters to create (default 2)
  -o, --overlap         create clusters with overlapping cidrs
      --retain          retain nodes for debugging when cluster creation fails (default true)
  -t, --tiller          deploy with tiller
      --wait duration   amount of minutes to wait for control plane nodes to be ready (default 5m0s)
  -w, --weave           deploy with weave

Load images

Load multiple images in to all active clusters. Please note that the images must exist locally.

./armada load docker-images --images alpine:latest,nginx:alpine

Load multiple images to specific clusters.

./armada load docker-images --images alpine:latest,nginx:alpine --clusters cluster1,cluster3

Load images command full usage.

./armada load docker-images -h
Load docker images in to the cluster

Usage:
  armada load docker-images [flags]

Flags:
  -c, --clusters strings   comma separated list of cluster names to load the image in to.
  -v, --debug              set log level to debug
  -h, --help               help for docker-images
  -i, --images strings     comma separated list images to load.

Destroy clusters

Destroy all clusters

./armada destroy clusters

Destroy specific clusters

./armada destroy clusters --clusters cl1,cl3