From f10fa8195cb4154958224c851aea35e1b908a838 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bruno=20Miguel=20Cust=C3=B3dio?= Date: Sat, 28 Mar 2020 14:52:18 +0000 Subject: [PATCH] Initial commit. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Bruno Miguel Custódio --- .gitignore | 3 + .travis.yml | 22 +++ LICENSE | 202 ++++++++++++++++++++++ Makefile | 20 +++ README.md | 106 ++++++++++++ cmd/kubectl-cilium/main.go | 28 ++++ go.mod | 60 +++++++ go.sum | 261 +++++++++++++++++++++++++++++ goreleaser.yaml | 23 +++ internal/cmd/exec.go | 91 ++++++++++ internal/cmd/root.go | 74 ++++++++ internal/constants/constants.go | 20 +++ internal/utils/cilium/namespace.go | 39 +++++ internal/utils/cilium/pod.go | 36 ++++ internal/utils/kubernetes/exec.go | 48 ++++++ internal/utils/kubernetes/node.go | 34 ++++ internal/utils/kubernetes/pod.go | 37 ++++ internal/version/version.go | 19 +++ 18 files changed, 1123 insertions(+) create mode 100644 .gitignore create mode 100644 .travis.yml create mode 100644 LICENSE create mode 100644 Makefile create mode 100644 README.md create mode 100644 cmd/kubectl-cilium/main.go create mode 100644 go.mod create mode 100644 go.sum create mode 100644 goreleaser.yaml create mode 100644 internal/cmd/exec.go create mode 100644 internal/cmd/root.go create mode 100644 internal/constants/constants.go create mode 100644 internal/utils/cilium/namespace.go create mode 100644 internal/utils/cilium/pod.go create mode 100644 internal/utils/kubernetes/exec.go create mode 100644 internal/utils/kubernetes/node.go create mode 100644 internal/utils/kubernetes/pod.go create mode 100644 internal/version/version.go diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..48602a2 --- /dev/null +++ b/.gitignore @@ -0,0 +1,3 @@ +/.idea/ +/bin/ +/dist/ diff --git a/.travis.yml b/.travis.yml new file mode 100644 index 0000000..ca3d4dc --- /dev/null +++ b/.travis.yml @@ -0,0 +1,22 @@ +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 diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..d645695 --- /dev/null +++ b/LICENSE @@ -0,0 +1,202 @@ + + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright [yyyy] [name of copyright owner] + + 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. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..e9ecd67 --- /dev/null +++ b/Makefile @@ -0,0 +1,20 @@ +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 diff --git a/README.md b/README.md new file mode 100644 index 0000000..6fe5238 --- /dev/null +++ b/README.md @@ -0,0 +1,106 @@ +# 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 86m v1.18.0 +kind-cilium-mesh-2-worker2 Ready 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. diff --git a/cmd/kubectl-cilium/main.go b/cmd/kubectl-cilium/main.go new file mode 100644 index 0000000..3731de0 --- /dev/null +++ b/cmd/kubectl-cilium/main.go @@ -0,0 +1,28 @@ +// 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() +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..4d211c9 --- /dev/null +++ b/go.mod @@ -0,0 +1,60 @@ +module github.com/bmcstdio/kubectl-cilium + +go 1.13 + +replace k8s.io/api => k8s.io/api v0.17.3 + +replace k8s.io/apiextensions-apiserver => k8s.io/apiextensions-apiserver v0.17.3 + +replace k8s.io/apimachinery => k8s.io/apimachinery v0.17.4-beta.0 + +replace k8s.io/apiserver => k8s.io/apiserver v0.17.3 + +replace k8s.io/cli-runtime => k8s.io/cli-runtime v0.17.3 + +replace k8s.io/client-go => k8s.io/client-go v0.17.3 + +replace k8s.io/cloud-provider => k8s.io/cloud-provider v0.17.3 + +replace k8s.io/cluster-bootstrap => k8s.io/cluster-bootstrap v0.17.3 + +replace k8s.io/code-generator => k8s.io/code-generator v0.17.4-beta.0 + +replace k8s.io/component-base => k8s.io/component-base v0.17.3 + +replace k8s.io/cri-api => k8s.io/cri-api v0.17.4-beta.0 + +replace k8s.io/csi-translation-lib => k8s.io/csi-translation-lib v0.17.3 + +replace k8s.io/kube-aggregator => k8s.io/kube-aggregator v0.17.3 + +replace k8s.io/kube-controller-manager => k8s.io/kube-controller-manager v0.17.3 + +replace k8s.io/kube-proxy => k8s.io/kube-proxy v0.17.3 + +replace k8s.io/kube-scheduler => k8s.io/kube-scheduler v0.17.3 + +replace k8s.io/kubectl => k8s.io/kubectl v0.17.3 + +replace k8s.io/kubelet => k8s.io/kubelet v0.17.3 + +replace k8s.io/legacy-cloud-providers => k8s.io/legacy-cloud-providers v0.17.3 + +replace k8s.io/metrics => k8s.io/metrics v0.17.3 + +replace k8s.io/node-api => k8s.io/node-api v0.17.3 + +replace k8s.io/sample-apiserver => k8s.io/sample-apiserver v0.17.3 + +replace k8s.io/sample-cli-plugin => k8s.io/sample-cli-plugin v0.17.3 + +replace k8s.io/sample-controller => k8s.io/sample-controller v0.17.3 + +require ( + github.com/spf13/cobra v0.0.5 + github.com/spf13/pflag v1.0.5 + k8s.io/api v0.17.3 + k8s.io/apimachinery v0.17.3 + k8s.io/cli-runtime v0.0.0-00010101000000-000000000000 + k8s.io/client-go v0.17.3 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..88b485c --- /dev/null +++ b/go.sum @@ -0,0 +1,261 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go 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+sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e/go.mod h1:wWxsB5ozmmv/SG7nM11ayaAW51xMvak/t1r0CSlcokI= +sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs= +sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o= diff --git a/goreleaser.yaml b/goreleaser.yaml new file mode 100644 index 0000000..4c9c21b --- /dev/null +++ b/goreleaser.yaml @@ -0,0 +1,23 @@ +before: + hooks: + - go mod download +builds: +- id: kubectl-cilium + main: ./cmd/kubectl-cilium + binary: kubectl-cilium + env: + - CGO_ENABLED=0 + goos: + - linux + - darwin + - windows + goarch: + - amd64 +archives: +- builds: + - kubectl-cilium + name_template: "{{ .ProjectName }}_{{ .Tag }}_{{ .Os }}_{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}" + wrap_in_directory: false + format: tar.gz + files: + - LICENSE diff --git a/internal/cmd/exec.go b/internal/cmd/exec.go new file mode 100644 index 0000000..4cbb4d5 --- /dev/null +++ b/internal/cmd/exec.go @@ -0,0 +1,91 @@ +// 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 cmd + +import ( + "fmt" + + "github.com/spf13/cobra" + "k8s.io/client-go/tools/cache" + + "github.com/bmcstdio/kubectl-cilium/internal/constants" + ciliumutils "github.com/bmcstdio/kubectl-cilium/internal/utils/cilium" + nodeutils "github.com/bmcstdio/kubectl-cilium/internal/utils/kubernetes" +) + +func init() { + rootCmd.AddCommand(execCmd) +} + +var execCmd = &cobra.Command{ + Args: cobra.MinimumNArgs(1), + DisableFlagsInUseLine: true, + Short: "Execute a command in a particular Cilium agent (default: '/bin/bash').", + Use: "exec (NODE|NAMESPACE/NAME) [COMMAND [args...]]", + RunE: func(cmd *cobra.Command, args []string) error { + var ( + command []string + ) + switch len(args) { + case 1: + command = []string{constants.DefaultCommand} + default: + command = args[1:] + } + return exec(args[0], command...) + }, +} + +func exec(target string, command ...string) error { + // Start by attempting to discover the namespace in which Cilium is installed. + ns, err := ciliumutils.DiscoverCiliumNamespace(kubeClient) + if err != nil { + return err + } + // Try to understand if 'target' is the name of a node or a '/' key targeting a pod. + tns, tn, err := cache.SplitMetaNamespaceKey(target) + if err != nil { + return fmt.Errorf("failed to parse %q as a target: %v", target, err) + } + var ( + nn string + ) + switch { + case tns == "": + // Assume that 'target' is the name of a node. + nn = tn + default: + // Lookup the name of the node where the pod referenced by 'target' is running. + v, err := nodeutils.GetNodeNameFromPod(kubeClient, tns, tn) + if err != nil { + return err + } + nn = v + } + // Double-check whether the targeted node exists. + ne, err := nodeutils.NodeExists(kubeClient, nn) + if err != nil { + return err + } + if !ne { + return fmt.Errorf("node with name %q does not exist", nn) + } + // Try to get the name of the Cilium pod running in the targeted node. + pn, err := ciliumutils.DiscoverCiliumPodInNode(kubeClient, ns, nn) + if err != nil { + return err + } + return nodeutils.Exec(kubeClient, kubeConfig, streams, ns, pn, true, true, command...) +} diff --git a/internal/cmd/root.go b/internal/cmd/root.go new file mode 100644 index 0000000..1e9a8e1 --- /dev/null +++ b/internal/cmd/root.go @@ -0,0 +1,74 @@ +// 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 cmd + +import ( + "os" + + "github.com/spf13/cobra" + "github.com/spf13/pflag" + "k8s.io/cli-runtime/pkg/genericclioptions" + "k8s.io/client-go/kubernetes" + "k8s.io/client-go/rest" + + "github.com/bmcstdio/kubectl-cilium/internal/version" +) + +func init() { + configFlags = genericclioptions.NewConfigFlags(true) + configFlags.AddFlags(rootCmd.PersistentFlags()) + rootCmd.SetVersionTemplate("kubectl-cilium " + version.Version) +} + +var ( + configFlags *genericclioptions.ConfigFlags + kubeClient kubernetes.Interface + kubeConfig *rest.Config + streams genericclioptions.IOStreams +) + +var rootCmd = &cobra.Command{ + Version: version.Version, + Args: cobra.NoArgs, + Use: "kubectl-cilium", + SilenceUsage: true, + Short: "A kubectl plugin for interacting with Cilium.", + PersistentPreRunE: func(cmd *cobra.Command, args []string) error { + var ( + err error + ) + kubeConfig, err = configFlags.ToRESTConfig() + if err != nil { + return err + } + kubeClient, err = kubernetes.NewForConfig(kubeConfig) + if err != nil { + return err + } + streams = genericclioptions.IOStreams{ + In: os.Stdin, + ErrOut: os.Stderr, + Out: os.Stdout, + } + return nil + }, +} + +func Execute() { + pflag.CommandLine = pflag.NewFlagSet("kubectl-cilium", pflag.ExitOnError) + if err := rootCmd.Execute(); err != nil { + os.Exit(1) + } +} diff --git a/internal/constants/constants.go b/internal/constants/constants.go new file mode 100644 index 0000000..d9147cc --- /dev/null +++ b/internal/constants/constants.go @@ -0,0 +1,20 @@ +// 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 constants + +const ( + CiliumLabelSelector = "k8s-app=cilium" + DefaultCommand = "/bin/bash" +) diff --git a/internal/utils/cilium/namespace.go b/internal/utils/cilium/namespace.go new file mode 100644 index 0000000..9cec823 --- /dev/null +++ b/internal/utils/cilium/namespace.go @@ -0,0 +1,39 @@ +// 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 cilium + +import ( + "fmt" + + corev1 "k8s.io/api/core/v1" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/client-go/kubernetes" + + "github.com/bmcstdio/kubectl-cilium/internal/constants" +) + +func DiscoverCiliumNamespace(kubeClient kubernetes.Interface) (string, error) { + pp, err := kubeClient.CoreV1().Pods(corev1.NamespaceAll).List(metav1.ListOptions{ + LabelSelector: constants.CiliumLabelSelector, + Limit: 1, + }) + if err != nil { + return "", fmt.Errorf("failed to discover Cilium namespace: %v", err) + } + if len(pp.Items) == 0 { + return "", fmt.Errorf("failed to discover Cilium namespace: no Cilium pods seem to be running in the cluster") + } + return pp.Items[0].Namespace, nil +} diff --git a/internal/utils/cilium/pod.go b/internal/utils/cilium/pod.go new file mode 100644 index 0000000..fa48c1a --- /dev/null +++ b/internal/utils/cilium/pod.go @@ -0,0 +1,36 @@ +// 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 cilium + +import ( + "fmt" + + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/client-go/kubernetes" +) + +func DiscoverCiliumPodInNode(kubeClient kubernetes.Interface, ciliumNamespace, nodeName string) (string, error) { + p, err := kubeClient.CoreV1().Pods(ciliumNamespace).List(metav1.ListOptions{ + FieldSelector: fmt.Sprintf("spec.nodeName==%s", nodeName), + Limit: 1, + }) + if err != nil { + return "", fmt.Errorf("failed to discover Cilium pod in node %q: %v", nodeName, err) + } + if len(p.Items) == 0 { + return "", fmt.Errorf("no Cilium pod is running on node %q", nodeName) + } + return p.Items[0].Name, nil +} diff --git a/internal/utils/kubernetes/exec.go b/internal/utils/kubernetes/exec.go new file mode 100644 index 0000000..27265a2 --- /dev/null +++ b/internal/utils/kubernetes/exec.go @@ -0,0 +1,48 @@ +// 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 pod + +import ( + v1 "k8s.io/api/core/v1" + "k8s.io/cli-runtime/pkg/genericclioptions" + "k8s.io/client-go/kubernetes" + "k8s.io/client-go/kubernetes/scheme" + restclient "k8s.io/client-go/rest" + "k8s.io/client-go/tools/remotecommand" +) + +func Exec(client kubernetes.Interface, config *restclient.Config, streams genericclioptions.IOStreams, podNamespace, podName string, stdin bool, tty bool, command ...string) error { + req := client.CoreV1().RESTClient().Post().Resource("pods").Namespace(podNamespace).Name(podName).SubResource("exec") + opt := &v1.PodExecOptions{ + Command: command, + Stdin: stdin, + Stdout: true, + Stderr: true, + TTY: tty, + } + req.VersionedParams( + opt, + scheme.ParameterCodec, + ) + exec, err := remotecommand.NewSPDYExecutor(config, "POST", req.URL()) + if err != nil { + return err + } + return exec.Stream(remotecommand.StreamOptions{ + Stdin: streams.In, + Stdout: streams.Out, + Stderr: streams.ErrOut, + }) +} diff --git a/internal/utils/kubernetes/node.go b/internal/utils/kubernetes/node.go new file mode 100644 index 0000000..5cabfdf --- /dev/null +++ b/internal/utils/kubernetes/node.go @@ -0,0 +1,34 @@ +// 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 pod + +import ( + "fmt" + + errors "k8s.io/apimachinery/pkg/api/errors" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/client-go/kubernetes" +) + +func NodeExists(kubeClient kubernetes.Interface, name string) (bool, error) { + _, err := kubeClient.CoreV1().Nodes().Get(name, metav1.GetOptions{}) + if err != nil { + if !errors.IsNotFound(err) { + return false, fmt.Errorf("failed to get node %q: %v", name, err) + } + return false, nil + } + return true, nil +} diff --git a/internal/utils/kubernetes/pod.go b/internal/utils/kubernetes/pod.go new file mode 100644 index 0000000..c80ce97 --- /dev/null +++ b/internal/utils/kubernetes/pod.go @@ -0,0 +1,37 @@ +// 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 pod + +import ( + "fmt" + + errors "k8s.io/apimachinery/pkg/api/errors" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/client-go/kubernetes" +) + +func GetNodeNameFromPod(kubeClient kubernetes.Interface, namespace, name string) (string, error) { + n, err := kubeClient.CoreV1().Pods(namespace).Get(name, metav1.GetOptions{}) + if err != nil { + if errors.IsNotFound(err) { + return "", fmt.Errorf("pod %q does not exist in namespace %q", name, namespace) + } + return "", nil + } + if n.Spec.NodeName == "" { + return "", fmt.Errorf("pod %q in namespace %q hasn't been assigned to a node", name, namespace) + } + return n.Spec.NodeName, nil +} diff --git a/internal/version/version.go b/internal/version/version.go new file mode 100644 index 0000000..76a51a8 --- /dev/null +++ b/internal/version/version.go @@ -0,0 +1,19 @@ +// 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 version + +var ( + Version = "(UNKNOWN)" +)