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kgctl.md

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kgctl

Kilo provides a command line tool for inspecting and interacting with clusters: kgctl. This tool can be used to understand a mesh's topology, get the WireGuard configuration for a peer, or graph a cluster. kgctl requires a Kubernetes configuration file to be provided, either by setting the KUBECONFIG environment variable or by providing the --kubeconfig flag.

Installation

Installing kgctl currently requires building the binary from source. Note: the Go toolchain must be installed in order to build the binary. To build and install kgctl, simply run:

go install github.com/squat/kilo/cmd/kgctl

Commands

Command Syntax Description
graph kgctl graph [flags] Produce a graph in GraphViz format representing the topology of the cluster.
showconf kgctl showconf ( node | peer ) NAME [flags] Show the WireGuard configuration for a node or peer in the mesh.

graph

The graph command generates a graph in GraphViz format representing the Kilo mesh. This graph can be helpful in understanding or debugging the topology of a network. Example:

kgctl graph

This will produce some output in the DOT graph description language, e.g.:

digraph kilo {
	label="10.2.4.0/24";
	labelloc=t;
	outputorder=nodesfirst;
	overlap=false;
	"ip-10-0-6-7"->"ip-10-0-6-146"[ dir=both ];
	"ip-10-1-13-74"->"ip-10-1-20-76"[ dir=both ];
	"ip-10-0-6-7"->"ip-10-1-13-74"[ dir=both ];
	"ip-10-0-6-7"->"squat"[ dir=both, style=dashed ];
	"ip-10-1-13-74"->"squat"[ dir=both, style=dashed ];

# ...

}
;

To render the graph, use one of the GraphViz layout tools, e.g. circo:

kgctl graph | circo -Tsvg > cluster.svg

This will generate an SVG like:

showconf

The showconf command outputs the WireGuard configuration for a node or peer in the cluster, i.e. the configuration that the node or peer would need to set on its local WireGuard interface in order to participate in the mesh. Example:

NODE=master # the name of a node
kgctl showconf node $NODE

This will produce some output in INI format, e.g.

[Interface]
ListenPort = 51820

[Peer]
AllowedIPs = 10.2.0.0/24, 10.1.13.74/32, 10.2.4.0/24, 10.1.20.76/32, 10.4.0.2/32
Endpoint = 3.120.246.76:51820
PersistentKeepalive = 0
PublicKey = IgDTEvasUvxisSAmfBKh8ngFmc2leZBvkRwYBhkybUg=

The --as-peer flag modifies the behavior of the command so that it outputs the configuration that a different WireGuard interface would need in order to communicate with the specified node or peer. When further combined with the --output yaml flag, this command can be useful to register a node in one cluster as a peer of another cluster, e.g.:

NODE=master # the name of a node
kgctl --kubeconfig $KUBECONFIG1 showconf node $NODE --as-peer --output yaml | kubectl --kubeconfig $KUBECONFIG2 apply -f -