mirror of https://github.com/k3s-io/k3s
Adding dummy and dummy-attachable example Flexvolume drivers; adding DaemonSet deployment example
Cheng Xing
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30acd4fb40
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# Copyright 2018 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 busybox
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WORKDIR .
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# TODO Change to your desired driver.
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COPY ./drivers/dummy /dummy
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COPY deploy.sh /deploy.sh
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CMD /bin/sh /deploy.sh
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This directory contains an example of the DaemonSet Flexvolume driver deployment method. See documentation [here](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/storage/flexvolume-deployment.md#recommended-driver-deployment-method).
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Steps to use the DaemonSet deployment method:
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1. Copy the Flexvolume driver to `drivers` directory. To get a basic example running, copy the `dummy` driver from the parent directory.
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1. If you'd like to just get a basic example running, you could skip this step. Otherwise, change the places marked with `TODO` in all files.
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1. Build the deployment Docker image and upload to your container registry.
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1. Create the DaemonSet.
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#!/bin/sh
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# Copyright 2018 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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set -o errexit
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set -o pipefail
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# TODO change to your desired driver.
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VENDOR=${VENDOR:-k8s}
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DRIVER=${DRIVER:-dummy}
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# Assuming the single driver file is located at /$DRIVER inside the DaemonSet image.
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driver_dir=$VENDOR${VENDOR:+"~"}${DRIVER}
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if [ ! -d "/flexmnt/$driver_dir" ]; then
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mkdir "/flexmnt/$driver_dir"
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fi
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tmp_driver=.tmp_$DRIVER
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cp "/$DRIVER" "/flexmnt/$driver_dir/$tmp_driver"
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mv -f "/flexmnt/$driver_dir/$tmp_driver" "/flexmnt/$driver_dir/$DRIVER"
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while : ; do
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sleep 3600
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done
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apiVersion: extensions/v1beta1
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kind: DaemonSet
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metadata:
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name: flex-ds
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spec:
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template:
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metadata:
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name: flex-deploy
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labels:
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app: flex-deploy
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spec:
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containers:
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# TODO Change to your container registry.
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- image: "<image_url>"
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name: flex-deploy
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securityContext:
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privileged: true
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volumeMounts:
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- mountPath: /flexmnt
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name: flexvolume-mount
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volumes:
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- name: flexvolume-mount
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hostPath:
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# TODO Change to the Flexvolume plugin directory of your cluster.
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path: /usr/libexec/kubernetes/kubelet-plugins/volume/exec/
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#!/bin/sh
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# Copyright 2017 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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# This driver implements a tmpfs with a pre-populated file index.html.
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FLEX_DUMMY_LOG=${FLEX_DUMMY_LOG:-"/tmp/flex-dummy.log"}
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log() {
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printf "$*" >&1
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}
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debug() {
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echo "$(date) $*" >> "${FLEX_DUMMY_LOG}"
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}
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domount() {
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debug "domount $@"
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MNTPATH=$1
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mkdir -p ${MNTPATH} >/dev/null 2>&1
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mount -t tmpfs none ${MNTPATH} >/dev/null 2>&1
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echo "Hello from flexvolume!" >> "${MNTPATH}/index.html"
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log "{\"status\":\"Success\"}"
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exit 0
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}
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unmount() {
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debug "unmount $@"
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MNTPATH=$1
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rm ${MNTPATH}/index.html >/dev/null 2>&1
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umount ${MNTPATH} >/dev/null 2>&1
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log "{\"status\":\"Success\"}"
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exit 0
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}
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op=$1
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if [ "$op" = "init" ]; then
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debug "init $@"
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log "{\"status\":\"Success\",\"capabilities\":{\"attach\":false}}"
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exit 0
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fi
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shift
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case "$op" in
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mount)
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domount $*
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;;
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unmount)
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unmount $*
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;;
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*)
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log "{\"status\":\"Not supported\"}"
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exit 0
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esac
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exit 1
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#!/bin/sh
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# Copyright 2017 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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# This driver implements a tmpfs with a pre-populated file index.html.
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# Attach is required, but it is a no-op that always returns success.
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FLEX_DUMMY_LOG=${FLEX_DUMMY_LOG:-"/tmp/flex-dummy.log"}
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VALID_MNTDEVICE=foo
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# attach always returns one valid mount device so a different device
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# showing up in a subsequent driver call implies a bug
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validateMountDeviceOrDie() {
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MNTDEVICE=$1
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CALL=$2
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if [ "$MNTDEVICE" != "$VALID_MNTDEVICE" ]; then
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log "{\"status\":\"Failure\",\"message\":\"call "${CALL}" expected device "${VALID_MNTDEVICE}", got device "${MNTDEVICE}"\"}"
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exit 0
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fi
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}
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log() {
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printf "$*" >&1
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}
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debug() {
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echo "$(date) $*" >> "${FLEX_DUMMY_LOG}"
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}
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attach() {
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debug "attach $@"
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log "{\"status\":\"Success\",\"device\":\""${VALID_MNTDEVICE}"\"}"
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exit 0
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}
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detach() {
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debug "detach $@"
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log "{\"status\":\"Success\"}"
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exit 0
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}
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waitforattach() {
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debug "waitforattach $@"
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MNTDEVICE=$1
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validateMountDeviceOrDie "$MNTDEVICE" "waitforattach"
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log "{\"status\":\"Success\",\"device\":\""${MNTDEVICE}"\"}"
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exit 0
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}
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isattached() {
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debug "isattached $@"
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log "{\"status\":\"Success\",\"attached\":true}"
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exit 0
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}
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domountdevice() {
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debug "domountdevice $@"
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MNTDEVICE=$2
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validateMountDeviceOrDie "$MNTDEVICE" "domountdevice"
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MNTPATH=$1
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mkdir -p ${MNTPATH} >/dev/null 2>&1
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mount -t tmpfs none ${MNTPATH} >/dev/null 2>&1
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echo "Hello from flexvolume!" >> "${MNTPATH}/index.html"
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log "{\"status\":\"Success\"}"
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exit 0
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}
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unmountdevice() {
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debug "unmountdevice $@"
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MNTDEVICE=$2
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validateMountDeviceOrDie "$MNTDEVICE" "unmountdevice"
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MNTPATH=$1
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rm "${MNTPATH}/index.html" >/dev/null 2>&1
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umount ${MNTPATH} >/dev/null 2>&1
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log "{\"status\":\"Success\"}"
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exit 0
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}
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op=$1
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if [ "$op" = "init" ]; then
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debug "init $@"
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log "{\"status\":\"Success\",\"capabilities\":{\"attach\":true}}"
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exit 0
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fi
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shift
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case "$op" in
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attach)
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attach $*
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;;
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detach)
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detach $*
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;;
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waitforattach)
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waitforattach $*
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;;
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isattached)
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isattached $*
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;;
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mountdevice)
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domountdevice $*
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;;
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unmountdevice)
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unmountdevice $*
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;;
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*)
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log "{\"status\":\"Not supported\"}"
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exit 0
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esac
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exit 1
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@ -0,0 +1,18 @@
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apiVersion: v1
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kind: Pod
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metadata:
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name: nginx-dummy-attachable
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namespace: default
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spec:
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containers:
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- name: nginx-dummy-attachable
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image: nginx
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volumeMounts:
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- name: dummy-attachable
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mountPath: /data
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ports:
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- containerPort: 80
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volumes:
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- name: dummy-attachable
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flexVolume:
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driver: "k8s/dummy-attachable"
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apiVersion: v1
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kind: Pod
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metadata:
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name: nginx-dummy
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namespace: default
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spec:
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containers:
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- name: nginx-dummy
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image: nginx
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volumeMounts:
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- name: dummy
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mountPath: /data
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ports:
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- containerPort: 80
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volumes:
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- name: dummy
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flexVolume:
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driver: "k8s/dummy"
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@ -14,6 +14,8 @@
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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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# This driver implements a tmpfs with a pre-populated file index.html.
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FLEX_DUMMY_LOG=${FLEX_DUMMY_LOG:-"/tmp/flex-dummy.log"}
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log() {
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@ -14,6 +14,9 @@
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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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# This driver implements a tmpfs with a pre-populated file index.html.
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# Attach is required, but it is a no-op that always returns success.
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FLEX_DUMMY_LOG=${FLEX_DUMMY_LOG:-"/tmp/flex-dummy.log"}
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VALID_MNTDEVICE=foo
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