delete kubectl-container (#136)
This is not an example and was here when we were releasing the gcr.io/google_containers/kubectl image actively (stopped doing that in 2015). This is now unused and does not work, therefore removing. Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>
This commit is contained in:
Ahmet Alp Balkan
GitHub
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commit
559c64edb3
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kubectl
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.tag
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# Copyright 2016 The Kubernetes Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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FROM scratch
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ADD kubectl kubectl
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ENTRYPOINT ["/kubectl"]
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# Copyright 2016 The Kubernetes Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# Use:
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#
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# `make kubectl` will build kubectl.
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# `make tag` will suggest a tag.
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# `make container` will build a container-- you must supply a tag.
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# `make push` will push the container-- you must supply a tag.
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GOARCH?=$(shell go env GOARCH)
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GOOS?=$(shell go env GOOS)
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kubectl:
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make -C ../../ WHAT=cmd/kubectl KUBE_STATIC_OVERRIDES="kubectl"; \
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cp ../../_output/local/bin/$(GOOS)/$(GOARCH)/kubectl .
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.tag: kubectl
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./kubectl version --client | grep -o 'GitVersion:"[^"]*"' | sed 's/[^"]*"\([^"+]*\).*/\1/' > .tag
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tag: .tag
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@echo "Suggest using TAG=$(shell cat .tag)"
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@echo "$$ make container TAG=$(shell cat .tag)"
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@echo "or"
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@echo "$$ make push TAG=$(shell cat .tag)"
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container:
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$(if $(TAG),,$(error TAG is not defined. Use 'make tag' to see a suggestion))
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docker build --pull -t gcr.io/google_containers/kubectl:$(TAG) .
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push: container
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$(if $(TAG),,$(error TAG is not defined. Use 'make tag' to see a suggestion))
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gcloud docker -- push gcr.io/google_containers/kubectl:$(TAG)
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clean:
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rm -f kubectl
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rm -f .tag
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To access the Kubernetes API [from a Pod](https://kubernetes.io/docs/concepts/cluster-administration/proxies/) one of the solution is to run `kubectl proxy` in a so-called sidecar container within the Pod. To do this, you need to package `kubectl` in a container. It is useful when service accounts are being used for accessing the API and the old no-auth KUBERNETES_RO service is not available. Since all containers in a Pod share the same network namespace, containers will be able to reach the API on localhost.
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This example contains a [Dockerfile](Dockerfile) and [Makefile](Makefile) for packaging up `kubectl` into
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a container and pushing the resulting container image on the Google Container Registry. You can modify the Makefile to push to a different registry if needed.
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Assuming that you have checked out the Kubernetes source code and setup your environment to be able to build it. The typical build step of this kubectl container will be:
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$ cd examples/kubectl-container
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$ make kubectl
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$ make tag
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$ make container
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$ make push
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It is not currently automated as part of a release process, so for the moment
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this is an example of what to do if you want to package `kubectl` into a
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container and use it within a pod.
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In the future, we may release consistently versioned groups of containers when
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we cut a release, in which case the source of gcr.io/google_containers/kubectl
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would become that automated process.
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[```pod.json```](pod.json) is provided as an example of running `kubectl` as a sidecar
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container in a Pod, and to help you verify that `kubectl` works correctly in
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this configuration. To launch this Pod, you will need a configured Kubernetes endpoint and `kubectl` installed locally, then simply create the Pod:
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$ kubectl create -f pod.json
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<!-- BEGIN MUNGE: GENERATED_ANALYTICS -->
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[]()
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<!-- END MUNGE: GENERATED_ANALYTICS -->
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{
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"kind": "Pod",
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"apiVersion": "v1",
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"metadata": {
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"name": "kubectl-tester"
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},
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"spec": {
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"containers": [
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{
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"name": "bb",
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"image": "gcr.io/google_containers/busybox",
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"command": [
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"sh", "-c", "sleep 5; wget -O - ${KUBERNETES_RO_SERVICE_HOST}:${KUBERNETES_RO_SERVICE_PORT}/api/v1/pods/; sleep 10000"
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],
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"ports": [
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{
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"containerPort": 8080
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}
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],
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"env": [
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{
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"name": "KUBERNETES_RO_SERVICE_HOST",
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"value": "127.0.0.1"
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},
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{
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"name": "KUBERNETES_RO_SERVICE_PORT",
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"value": "8001"
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}
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],
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"volumeMounts": [
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{
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"name": "test-volume",
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"mountPath": "/mount/test-volume"
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}
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]
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},
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{
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"name": "kubectl",
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"image": "gcr.io/google_containers/kubectl:v0.18.0-120-gaeb4ac55ad12b1-dirty",
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"imagePullPolicy": "Always",
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"args": [
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"proxy", "-p", "8001"
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]
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}
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],
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"volumes": [
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{
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"name": "test-volume",
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"emptyDir": {}
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}
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]
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}
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}
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