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Signed-off-by: Bruno Miguel Custódio <[email protected]>
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3 changes: 3 additions & 0 deletions .gitignore
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/.idea/
/bin/
/dist/
22 changes: 22 additions & 0 deletions .travis.yml
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language: go
go:
- 1.13.x
cache:
directories:
- $GOPATH/pkg/mod
- $HOME/.cache/go-build
env:
global:
- CGO_ENABLED=0
- GO111MODULE=on
before_script:
- go mod download
script:
- make ci
deploy:
- provider: script
skip_cleanup: true
script: curl -sL https://git.io/goreleaser | bash
on:
tags: true
condition: $TRAVIS_OS_NAME = linux
202 changes: 202 additions & 0 deletions LICENSE
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20 changes: 20 additions & 0 deletions Makefile
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SHELL := /bin/bash

ROOT := $(shell git rev-parse --show-toplevel)

VERSION := $(shell git describe --always --dirty=-dev)

.PHONY: build
build:
@CGO_ENABLED=0 go build -ldflags="-X github.com/bmcstdio/kubectl-cilium/internal/version.Version=$(VERSION)" \
-v -o "$(ROOT)/bin/kubectl-cilium" -tags netgo "$(ROOT)/cmd/kubectl-cilium/"

.PHONY: ci
ci: lint build

$(ROOT)/bin/golangci-lint:
@curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s v1.24.0

.PHONY: lint
lint: $(ROOT)/bin/golangci-lint
@$(ROOT)/bin/golangci-lint run --enable-all --disable gochecknoglobals,gochecknoinits,gomnd,lll,wsl --timeout 5m
106 changes: 106 additions & 0 deletions README.md
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# kubectl-cilium

A `kubectl` plugin for interacting with [Cilium](https://cilium.io).

![Release](https://img.shields.io/github/v/release/bmcstdio/kubectl-cilium)
![Downloads](https://img.shields.io/github/downloads/bmcstdio/kubectl-cilium/total?color=green)
[![Build](https://img.shields.io/travis/com/bmcstdio/kubectl-cilium)](https://travis-ci.com/bmcstdio/kubectl-cilium)
![License](https://img.shields.io/github/license/bmcstdio/kubectl-cilium)

## Installation

At the moment, `kubectl-cilium` must be installed by running

```shell
$ go get github.com/bmcstdio/kubectl-cilium/cmd/kubectl-cilium
```

or by cloning this repository, running

```shell
$ make build
```

and copying `./bin/kubectl-cilium` to a directory in your `$PATH`.

## Examples

### `kubectl-cilium exec`

The `exec` command allows you to execute a command on a Cilium agent targeted by either a node name or a `namespace/name` key targeting any pod in the cluster.
For example, assuming that your Kubernetes cluster has nodes

```shell
$ kubectl get node
NAME STATUS ROLES AGE VERSION
kind-cilium-mesh-2-control-plane Ready master 87m v1.18.0
kind-cilium-mesh-2-worker Ready <none> 86m v1.18.0
kind-cilium-mesh-2-worker2 Ready <none> 86m v1.18.0
```

and pods

```shell
$ kubectl get pod --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE
kube-system cilium-8dzvt 1/1 Running 0 86m 172.17.0.7 kind-cilium-mesh-2-control-plane
kube-system cilium-8lmlb 1/1 Running 0 86m 172.17.0.5 kind-cilium-mesh-2-worker
kube-system cilium-etcd-2pphwr5jhg 1/1 Running 0 88m 10.20.2.12 kind-cilium-mesh-2-worker
kube-system cilium-etcd-operator-59b4987745-n94pb 1/1 Running 0 90m 172.17.0.7 kind-cilium-mesh-2-control-plane
kube-system cilium-jcs44 1/1 Running 0 86m 172.17.0.6 kind-cilium-mesh-2-worker2
kube-system cilium-operator-77dd4b8544-vb2kf 1/1 Running 0 86m 172.17.0.5 kind-cilium-mesh-2-worker
kube-system coredns-5644d7b6d9-fhmff 1/1 Running 0 81m 10.20.2.62 kind-cilium-mesh-2-worker
kube-system coredns-5644d7b6d9-x9ksr 1/1 Running 0 81m 10.20.0.68 kind-cilium-mesh-2-control-plane
kube-system etcd-kind-cilium-mesh-2-control-plane 1/1 Running 0 90m 172.17.0.7 kind-cilium-mesh-2-control-plane
kube-system etcd-operator-59cf4cfb7c-4snqh 1/1 Running 0 81m 10.20.2.109 kind-cilium-mesh-2-worker
kube-system kube-apiserver-kind-cilium-mesh-2-control-plane 1/1 Running 0 90m 172.17.0.7 kind-cilium-mesh-2-control-plane
kube-system kube-controller-manager-kind-cilium-mesh-2-control-plane 1/1 Running 0 90m 172.17.0.7 kind-cilium-mesh-2-control-plane
kube-system kube-proxy-tk2xm 1/1 Running 0 90m 172.17.0.5 kind-cilium-mesh-2-worker
kube-system kube-proxy-wwl2g 1/1 Running 0 90m 172.17.0.6 kind-cilium-mesh-2-worker2
kube-system kube-proxy-zrz4z 1/1 Running 0 91m 172.17.0.7 kind-cilium-mesh-2-control-plane
kube-system kube-scheduler-kind-cilium-mesh-2-control-plane 1/1 Running 0 90m 172.17.0.7 kind-cilium-mesh-2-control-plane
local-path-storage local-path-provisioner-7745554f7f-9mmr8 1/1 Running 1 91m 10.20.0.114 kind-cilium-mesh-2-control-plane
```

running

```shell
$ kubectl-cilium exec local-path-storage/local-path-provisioner-7745554f7f-9mmr8 cilium monitor
```

will start monitoring all Cilium-managed traffic in node `kind-cilium-mesh-2-control-plane`:

```shell
$ kubectl-cilium exec local-path-storage/local-path-provisioner-7745554f7f-9mmr8 cilium monitor
Listening for events on 4 CPUs with 64x4096 of shared memory
Press Ctrl-C to quit
level=info msg="Initializing dissection cache..." subsys=monitor
-> overlay flow 0x883a3a1b identity 4->0 state new ifindex cilium_vxlan orig-ip 0.0.0.0: 10.20.0.234:4240 -> 10.20.2.90:59456 tcp ACK
-> endpoint 1534 flow 0xef026664 identity 6->4 state established ifindex lxc_health orig-ip 10.20.2.90: 10.20.2.90:59456 -> 10.20.0.234:4240 tcp ACK
-> endpoint 1980 flow 0xb0e8433f identity 1->104 state new ifindex lxcb42c26c3bbf8 orig-ip 10.20.0.122: 10.20.0.122:47168 -> 10.20.0.68:8181 tcp SYN
-> host from flow 0x4a33a3f3 identity 104->1 state reply ifindex cilium_net orig-ip 0.0.0.0: 10.20.0.68:8181 -> 10.20.0.122:47168 tcp SYN, ACK
(...)
```

If no command is specified, `/bin/bash` is used by default:

```shell
$ kubectl-cilium exec local-path-storage/local-path-provisioner-7745554f7f-9mmr8
root@kind-cilium-mesh-2-control-plane:~#
```

## License

Copyright 2020 bmcstdio

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
28 changes: 28 additions & 0 deletions cmd/kubectl-cilium/main.go
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// Copyright 2020 bmcstdio
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package main

import (
_ "k8s.io/client-go/plugin/pkg/client/auth/azure"
_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
_ "k8s.io/client-go/plugin/pkg/client/auth/oidc"
_ "k8s.io/client-go/plugin/pkg/client/auth/openstack"

"github.com/bmcstdio/kubectl-cilium/internal/cmd"
)

func main() {
cmd.Execute()
}

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