Little helper to run CNCF's k3s in Docker
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k3d/docs/usage/commands.md

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# Command Tree
```bash
k3d
--verbose # GLOBAL: enable verbose (debug) logging (default: false)
--trace # GLOBAL: enable super verbose logging (trace logging) (default: false)
--version # show k3d and k3s version
-h, --help # GLOBAL: show help text
cluster [CLUSTERNAME] # default cluster name is 'k3s-default'
create
-a, --agents # specify how many agent nodes you want to create (integer, default: 0)
--agents-memory # specify memory limit for agent containers/nodes (unit, e.g. 1g)
--api-port # specify the port on which the cluster will be accessible (format '[HOST:]HOSTPORT', default: random)
-c, --config # use a config file (format 'PATH')
-e, --env # add environment variables to the nodes (quoted string, format: 'KEY[=VALUE][@NODEFILTER[;NODEFILTER...]]', use flag multiple times)
--gpus # [from docker CLI] add GPU devices to the node containers (string, e.g. 'all')
-i, --image # specify which k3s image should be used for the nodes (string, default: 'docker.io/rancher/k3s:v1.20.0-k3s2', tag changes per build)
--k3s-arg # add additional arguments to the k3s server/agent (quoted string, use flag multiple times) (see https://rancher.com/docs/k3s/latest/en/installation/install-options/server-config/#k3s-server-cli-help & https://rancher.com/docs/k3s/latest/en/installation/install-options/agent-config/#k3s-agent-cli-help)
--kubeconfig-switch-context # (implies --kubeconfig-update-default) automatically sets the current-context of your default kubeconfig to the new cluster's context (default: true)
--kubeconfig-update-default # enable the automated update of the default kubeconfig with the details of the newly created cluster (also sets '--wait=true') (default: true)
-l, --label # add (docker) labels to the node containers (format: 'KEY[=VALUE][@NODEFILTER[;NODEFILTER...]]', use flag multiple times)
--network # specify an existing (docker) network you want to connect to (string)
--no-hostip # disable the automatic injection of the Host IP as 'host.k3d.internal' into the containers and CoreDNS (default: false)
--no-image-volume # disable the creation of a volume for storing images (used for the 'k3d image import' command) (default: false)
--no-lb # disable the creation of a load balancer in front of the server nodes (default: false)
--no-rollback # disable the automatic rollback actions, if anything goes wrong (default: false)
-p, --port # add some more port mappings (format: '[HOST:][HOSTPORT:]CONTAINERPORT[/PROTOCOL][@NODEFILTER]', use flag multiple times)
--registry-create # create a new (docker) registry dedicated for this cluster (default: false)
--registry-use # use an existing local (docker) registry with this cluster (string, use multiple times)
-s, --servers # specify how many server nodes you want to create (integer, default: 1)
--servers-memory # specify memory limit for server containers/nodes (unit, e.g. 1g)
--token # specify a cluster token (string, default: auto-generated)
--timeout # specify a timeout, after which the cluster creation will be interrupted and changes rolled back (duration, e.g. '10s')
-v, --volume # specify additional bind-mounts (format: '[SOURCE:]DEST[@NODEFILTER[;NODEFILTER...]]', use flag multiple times)
--wait # enable waiting for all server nodes to be ready before returning (default: true)
start CLUSTERNAME # start a (stopped) cluster
-a, --all # start all clusters (default: false)
--wait # wait for all servers and server-loadbalancer to be up before returning (default: true)
--timeout # maximum waiting time for '--wait' before canceling/returning (duration, e.g. '10s')
stop CLUSTERNAME # stop a cluster
-a, --all # stop all clusters (default: false)
delete CLUSTERNAME # delete an existing cluster
-a, --all # delete all existing clusters (default: false)
list [CLUSTERNAME [CLUSTERNAME ...]]
--no-headers # do not print headers (default: false)
--token # show column with cluster tokens (default: false)
-o, --output # format the output (format: 'json|yaml')
completion [bash | zsh | fish | (psh | powershell)] # generate completion scripts for common shells
config
init # write a default k3d config (as a starting point)
-f, --force # force overwrite target file (default: false)
-o, --output # file to write to (string, default "k3d-default.yaml")
help [COMMAND] # show help text for any command
image
import [IMAGE | ARCHIVE [IMAGE | ARCHIVE ...]] # Load one or more images from the local runtime environment or tar-archives into k3d clusters
-c, --cluster # clusters to load the image into (string, use flag multiple times, default: k3s-default)
-k, --keep-tarball # do not delete the image tarball from the shared volume after completion (default: false)
kubeconfig
get (CLUSTERNAME [CLUSTERNAME ...] | --all) # get kubeconfig from cluster(s) and write it to stdout
-a, --all # get kubeconfigs from all clusters (default: false)
merge | write (CLUSTERNAME [CLUSTERNAME ...] | --all) # get kubeconfig from cluster(s) and merge it/them into a (kubeconfig-)file
-a, --all # get kubeconfigs from all clusters (default: false)
-s, --kubeconfig-switch-context # switch current-context in kubeconfig to the new context (default: true)
-d, --kubeconfig-merge-default # update the default kubeconfig (usually $KUBECONFIG or $HOME/.kube/config)
-o, --output # specify the output file where the kubeconfig should be written to (string)
--overwrite # [Careful!] forcefully overwrite the output file, ignoring existing contents (default: false)
-u, --update # update conflicting fields in existing kubeconfig (default: true)
node
create NODENAME # Create new nodes (and add them to existing clusters)
-c, --cluster # specify the cluster that the node shall connect to (string, default: k3s-default)
-i, --image # specify which k3s image should be used for the node(s) (string, default: 'docker.io/rancher/k3s:v1.20.0-k3s2', tag changes per build)
--replicas # specify how many replicas you want to create with this spec (integer, default: 1)
--role # specify the node role (string, format: 'agent|server', default: agent)
--timeout # specify a timeout duration, after which the node creation will be interrupted, if not done yet (duration, e.g. '10s')
--wait # wait for the node to be up and running before returning (default: true)
start NODENAME # start a (stopped) node
stop NODENAME # stop a node
delete NODENAME # delete an existing node
-a, --all # delete all existing nodes (default: false)
-r, --registries # also delete registries, as a special type of node (default: false)
list NODENAME
--no-headers # do not print headers (default: false)
registry
create REGISTRYNAME
-i, --image # specify image used for the registry (string, default: "docker.io/library/registry:2")
-p, --port # select host port to map to (format: '[HOST:]HOSTPORT', default: 'random')
delete REGISTRYNAME
-a, --all # delete all existing registries (default: false)
list [NAME [NAME...]]
--no-headers # disable table headers (default: false)
version # show k3d and k3s version
```