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Merge pull request #16069 from zmerlynn/nfs-1.1
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63af7c227e
@ -10,6 +10,7 @@ pkg-core:
|
||||
- apt-transport-https
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- python-apt
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- glusterfs-client
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- nfs-common
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- socat
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{% endif %}
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# Ubuntu installs netcat-openbsd by default, but on GCE/Debian netcat-traditional is installed.
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@ -291,15 +291,6 @@ before you can use it__
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See the [NFS example](../../examples/nfs/) for more details.
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For example, [this file](../../examples/nfs/nfs-web-pod.yaml) demonstrates how to
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specify the usage of an NFS volume within a pod.
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In this example one can see that a `volumeMount` called `nfs` is being mounted
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onto `/usr/share/nginx/html` in the container `web`. The volume "nfs" is defined as
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type `nfs`, with the NFS server serving from `nfs-server.default.kube.local`
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and exporting directory `/` as the share. The mount being created in this
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example is writeable.
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### iscsi
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An `iscsi` volume allows an existing iSCSI (SCSI over IP) volume to be mounted
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@ -308,9 +308,13 @@ func TestExampleObjectSchemas(t *testing.T) {
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"wordpress": &api.Pod{},
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},
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"../examples/nfs": {
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"nfs-server-pod": &api.Pod{},
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"nfs-busybox-rc": &api.ReplicationController{},
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"nfs-server-rc": &api.ReplicationController{},
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"nfs-server-service": &api.Service{},
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"nfs-web-pod": &api.Pod{},
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"nfs-pv": &api.PersistentVolume{},
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"nfs-pvc": &api.PersistentVolumeClaim{},
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"nfs-web-rc": &api.ReplicationController{},
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"nfs-web-service": &api.Service{},
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},
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"../docs/user-guide/node-selection": {
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"pod": &api.Pod{},
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@ -33,57 +33,115 @@ Documentation for other releases can be found at
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# Example of NFS volume
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See [nfs-web-pod.yaml](nfs-web-pod.yaml) for a quick example, how to use NFS volume
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in a pod.
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See [nfs-web-rc.yaml](nfs-web-rc.yaml) for a quick example of how to use an NFS
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volume claim in a replication controller. It relies on the
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[NFS persistent volume](nfs-pv.yaml) and
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[NFS persistent volume claim](nfs-pvc.yaml) in this example as well.
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## Complete setup
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The example below shows how to export a NFS share from a pod and imports it
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into another one.
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### Prerequisites
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The nfs server pod creates a privileged container, so if you are using a Salt based KUBERNETES_PROVIDER (**gce**, **vagrant**, **aws**), you have to enable the ability to create privileged containers by API.
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```sh
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# At the root of Kubernetes source code
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$ vi cluster/saltbase/pillar/privilege.sls
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# If true, allow privileged containers to be created by API
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allow_privileged: true
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```
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For other non-salt based provider, you can set `--allow-privileged=true` for both api-server and kubelet, and then restart these components.
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Rebuild the Kubernetes and spin up a cluster using your preferred KUBERNETES_PROVIDER.
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The example below shows how to export a NFS share from a single pod replication
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controller and import it into two replication controllers.
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### NFS server part
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Define [NFS server pod](nfs-server-pod.yaml) and
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Define [NFS server controller](nfs-server-rc.yaml) and
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[NFS service](nfs-server-service.yaml):
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$ kubectl create -f nfs-server-pod.yaml
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$ kubectl create -f nfs-server-service.yaml
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```console
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$ kubectl create -f examples/nfs/nfs-server-rc.yaml
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$ kubectl create -f examples/nfs/nfs-server-service.yaml
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```
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The server exports `/mnt/data` directory as `/` (fsid=0). The directory contains
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dummy `index.html`. Wait until the pod is running!
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The server exports `/mnt/data` directory as `/` (fsid=0). The
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directory contains dummy `index.html`. Wait until the pod is running
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by checking `kubectl get pods -lrole=nfs-server`.
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### NFS client
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### Create the NFS claim
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[WEB server pod](nfs-web-pod.yaml) uses the NFS share exported above as a NFS
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volume and runs simple web server on it. The pod assumes your DNS is configured
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and the NFS service is reachable as `nfs-server.default.kube.local`. Edit the
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yaml file to supply another name or directly its IP address (use
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`kubectl get services` to get it).
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The [NFS busybox controller](nfs-busybox-rc.yaml) uses a simple script to
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generate data written to the NFS server we just started. First, you'll need to
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find the cluster IP of the server:
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```console
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$ kubectl describe services nfs-server
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```
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Replace the invalid IP in the [nfs PV](nfs-pv.yaml). (In the future,
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we'll be able to tie these together using the service names, but for
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now, you have to hardcode the IP.)
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Create the the [persistent volume](../../docs/user-guide/persistent-volumes.md)
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and the persistent volume claim for your NFS server. The persistent volume and
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claim gives us an indirection that allow multiple pods to refer to the NFS
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server using a symbolic name rather than the hardcoded server address.
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```console
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$ kubectl create -f examples/nfs/nfs-pv.yaml
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$ kubectl create -f examples/nfs/nfs-pvc.yaml
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```
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## Setup the fake backend
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The [NFS busybox controller](nfs-busybox-rc.yaml) updates `index.html` on the
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NFS server every 10 seconds. Let's start that now:
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```console
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$ kubectl create -f examples/nfs/nfs-busybox-rc.yaml
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```
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Conveniently, it's also a `busybox` pod, so we can get an early check
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that our mounts are working now. Find a busybox pod and exec:
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```console
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$ kubectl get pod -lname=nfs-busybox
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NAME READY STATUS RESTARTS AGE
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nfs-busybox-jdhf3 1/1 Running 0 25m
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nfs-busybox-w3s4t 1/1 Running 0 25m
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$ kubectl exec nfs-busybox-jdhf3 -- cat /mnt/index.html
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Thu Oct 22 19:20:18 UTC 2015
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nfs-busybox-w3s4t
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```
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You should see output similar to the above if everything is working well. If
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it's not, make sure you changed the invalid IP in the [NFS PV](nfs-pv.yaml) file
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and make sure the `describe services` command above had endpoints listed
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(indicating the service was associated with a running pod).
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### Setup the web server
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The [web server controller](nfs-web-rc.yaml) is an another simple replication
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controller demonstrates reading from the NFS share exported above as a NFS
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volume and runs a simple web server on it.
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Define the pod:
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$ kubectl create -f nfs-web-pod.yaml
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```console
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$ kubectl create -f examples/nfs/nfs-web-rc.yaml
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```
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Now the pod serves `index.html` from the NFS server:
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This creates two pods, each of which serve the `index.html` from above. We can
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then use a simple service to front it:
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$ curl http://<the container IP address>/
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Hello World!
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```console
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kubectl create -f examples/nfs/nfs-web-service.yaml
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```
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We can then use the busybox container we launched before to check that `nginx`
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is serving the data appropriately:
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```console
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$ kubectl get pod -lname=nfs-busybox
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NAME READY STATUS RESTARTS AGE
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nfs-busybox-jdhf3 1/1 Running 0 1h
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nfs-busybox-w3s4t 1/1 Running 0 1h
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$ kubectl get services nfs-web
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NAME LABELS SELECTOR IP(S) PORT(S)
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nfs-web <none> role=web-frontend 10.0.68.37 80/TCP
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$ kubectl exec nfs-busybox-jdhf3 -- wget -qO- http://10.0.68.37
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Thu Oct 22 19:28:55 UTC 2015
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nfs-busybox-w3s4t
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```
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<!-- BEGIN MUNGE: GENERATED_ANALYTICS -->
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@ -1,11 +0,0 @@
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FROM fedora:21
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MAINTAINER Jan Safranek <jsafrane@redhat.com>
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EXPOSE 2049/tcp
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RUN yum -y install nfs-utils && yum clean all
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ADD run_nfs /usr/local/bin/
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RUN chmod +x /usr/local/bin/run_nfs
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ENTRYPOINT ["/usr/local/bin/run_nfs"]
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@ -1,48 +0,0 @@
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<!-- BEGIN MUNGE: UNVERSIONED_WARNING -->
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<!-- BEGIN STRIP_FOR_RELEASE -->
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|
||||
<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
|
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width="25" height="25">
|
||||
<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
|
||||
width="25" height="25">
|
||||
<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
|
||||
width="25" height="25">
|
||||
<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
|
||||
width="25" height="25">
|
||||
<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
|
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width="25" height="25">
|
||||
|
||||
<h2>PLEASE NOTE: This document applies to the HEAD of the source tree</h2>
|
||||
|
||||
If you are using a released version of Kubernetes, you should
|
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refer to the docs that go with that version.
|
||||
|
||||
<strong>
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||||
The latest 1.0.x release of this document can be found
|
||||
[here](http://releases.k8s.io/release-1.0/examples/nfs/exporter/README.md).
|
||||
|
||||
Documentation for other releases can be found at
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||||
[releases.k8s.io](http://releases.k8s.io).
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||||
</strong>
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--
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<!-- END STRIP_FOR_RELEASE -->
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<!-- END MUNGE: UNVERSIONED_WARNING -->
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# NFS-exporter container
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Inspired by https://github.com/cpuguy83/docker-nfs-server. Rewritten for
|
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Fedora.
|
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|
||||
Serves NFS4 exports, defined on command line. At least one export must be defined!
|
||||
|
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Usage::
|
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|
||||
docker run -d --name nfs --privileged jsafrane/nfsexporter /path/to/share /path/to/share2 ...
|
||||
|
||||
|
||||
<!-- BEGIN MUNGE: GENERATED_ANALYTICS -->
|
||||
[]()
|
||||
<!-- END MUNGE: GENERATED_ANALYTICS -->
|
||||
@ -1,72 +0,0 @@
|
||||
#!/bin/bash
|
||||
|
||||
# Copyright 2015 The Kubernetes Authors All rights reserved.
|
||||
#
|
||||
# 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.
|
||||
|
||||
function start()
|
||||
{
|
||||
|
||||
# prepare /etc/exports
|
||||
seq=0
|
||||
for i in "$@"; do
|
||||
echo "$i *(rw,sync,no_root_squash,insecure,fsid=$seq)" >> /etc/exports
|
||||
seq=$(($seq + 1))
|
||||
echo "Serving $i"
|
||||
done
|
||||
|
||||
# from /lib/systemd/system/proc-fs-nfsd.mount
|
||||
mount -t nfsd nfds /proc/fs/nfsd
|
||||
|
||||
# from /lib/systemd/system/nfs-config.service
|
||||
/usr/lib/systemd/scripts/nfs-utils_env.sh
|
||||
|
||||
# from /lib/systemd/system/nfs-mountd.service
|
||||
. /run/sysconfig/nfs-utils
|
||||
/usr/sbin/rpc.mountd $RPCMOUNTDARGS
|
||||
|
||||
# from /lib/systemd/system/nfs-server.service
|
||||
. /run/sysconfig/nfs-utils
|
||||
/usr/sbin/exportfs -r
|
||||
/usr/sbin/rpc.nfsd -N 2 -N 3 -V 4 -V 4.1 $RPCNFSDARGS
|
||||
|
||||
echo "NFS started"
|
||||
}
|
||||
|
||||
function stop()
|
||||
{
|
||||
echo "Stopping NFS"
|
||||
|
||||
# from /lib/systemd/system/nfs-server.service
|
||||
/usr/sbin/rpc.nfsd 0
|
||||
/usr/sbin/exportfs -au
|
||||
/usr/sbin/exportfs -f
|
||||
|
||||
# from /lib/systemd/system/nfs-mountd.service
|
||||
kill $( pidof rpc.mountd )
|
||||
# from /lib/systemd/system/proc-fs-nfsd.mount
|
||||
umount /proc/fs/nfsd
|
||||
|
||||
echo > /etc/exports
|
||||
exit 0
|
||||
}
|
||||
|
||||
|
||||
trap stop TERM
|
||||
|
||||
start "$@"
|
||||
|
||||
# Ugly hack to do nothing and wait for SIGTERM
|
||||
while true; do
|
||||
read
|
||||
done
|
||||
32
examples/nfs/nfs-busybox-rc.yaml
Normal file
32
examples/nfs/nfs-busybox-rc.yaml
Normal file
@ -0,0 +1,32 @@
|
||||
# This mounts the nfs volume claim into /mnt and continuously
|
||||
# overwrites /mnt/index.html with the time and hostname of the pod.
|
||||
|
||||
apiVersion: v1
|
||||
kind: ReplicationController
|
||||
metadata:
|
||||
name: nfs-busybox
|
||||
spec:
|
||||
replicas: 2
|
||||
selector:
|
||||
name: nfs-busybox
|
||||
template:
|
||||
metadata:
|
||||
labels:
|
||||
name: nfs-busybox
|
||||
spec:
|
||||
containers:
|
||||
- image: busybox
|
||||
command:
|
||||
- sh
|
||||
- -c
|
||||
- 'while true; do date > /mnt/index.html; hostname >> /mnt/index.html; sleep $(($RANDOM % 5 + 5)); done'
|
||||
imagePullPolicy: IfNotPresent
|
||||
name: busybox
|
||||
volumeMounts:
|
||||
# name must match the volume name below
|
||||
- name: nfs
|
||||
mountPath: "/mnt"
|
||||
volumes:
|
||||
- name: nfs
|
||||
persistentVolumeClaim:
|
||||
claimName: nfs
|
||||
13
examples/nfs/nfs-pv.yaml
Normal file
13
examples/nfs/nfs-pv.yaml
Normal file
@ -0,0 +1,13 @@
|
||||
apiVersion: v1
|
||||
kind: PersistentVolume
|
||||
metadata:
|
||||
name: nfs
|
||||
spec:
|
||||
capacity:
|
||||
storage: 1Mi
|
||||
accessModes:
|
||||
- ReadWriteMany
|
||||
nfs:
|
||||
# FIXME: use the right IP
|
||||
server: 10.999.999.999
|
||||
path: "/"
|
||||
10
examples/nfs/nfs-pvc.yaml
Normal file
10
examples/nfs/nfs-pvc.yaml
Normal file
@ -0,0 +1,10 @@
|
||||
kind: PersistentVolumeClaim
|
||||
apiVersion: v1
|
||||
metadata:
|
||||
name: nfs
|
||||
spec:
|
||||
accessModes:
|
||||
- ReadWriteMany
|
||||
resources:
|
||||
requests:
|
||||
storage: 1Mi
|
||||
@ -1,15 +0,0 @@
|
||||
apiVersion: v1
|
||||
kind: Pod
|
||||
metadata:
|
||||
name: nfs-server
|
||||
labels:
|
||||
role: nfs-server
|
||||
spec:
|
||||
containers:
|
||||
- name: nfs-server
|
||||
image: jsafrane/nfs-data
|
||||
ports:
|
||||
- name: nfs
|
||||
containerPort: 2049
|
||||
securityContext:
|
||||
privileged: true
|
||||
21
examples/nfs/nfs-server-rc.yaml
Normal file
21
examples/nfs/nfs-server-rc.yaml
Normal file
@ -0,0 +1,21 @@
|
||||
apiVersion: v1
|
||||
kind: ReplicationController
|
||||
metadata:
|
||||
name: nfs-server
|
||||
spec:
|
||||
replicas: 1
|
||||
selector:
|
||||
role: nfs-server
|
||||
template:
|
||||
metadata:
|
||||
labels:
|
||||
role: nfs-server
|
||||
spec:
|
||||
containers:
|
||||
- name: nfs-server
|
||||
image: gcr.io/google_containers/volume-nfs
|
||||
ports:
|
||||
- name: nfs
|
||||
containerPort: 2049
|
||||
securityContext:
|
||||
privileged: true
|
||||
@ -1,25 +0,0 @@
|
||||
#
|
||||
# This pod imports nfs-server.default.kube.local:/ into /usr/share/nginx/html
|
||||
#
|
||||
|
||||
apiVersion: v1
|
||||
kind: Pod
|
||||
metadata:
|
||||
name: nfs-web
|
||||
spec:
|
||||
containers:
|
||||
- name: web
|
||||
image: nginx
|
||||
ports:
|
||||
- name: web
|
||||
containerPort: 80
|
||||
volumeMounts:
|
||||
# name must match the volume name below
|
||||
- name: nfs
|
||||
mountPath: "/usr/share/nginx/html"
|
||||
volumes:
|
||||
- name: nfs
|
||||
nfs:
|
||||
# FIXME: use the right hostname
|
||||
server: nfs-server.default.kube.local
|
||||
path: "/"
|
||||
30
examples/nfs/nfs-web-rc.yaml
Normal file
30
examples/nfs/nfs-web-rc.yaml
Normal file
@ -0,0 +1,30 @@
|
||||
# This pod mounts the nfs volume claim into /usr/share/nginx/html and
|
||||
# serves a simple web page.
|
||||
|
||||
apiVersion: v1
|
||||
kind: ReplicationController
|
||||
metadata:
|
||||
name: nfs-web
|
||||
spec:
|
||||
replicas: 2
|
||||
selector:
|
||||
role: web-frontend
|
||||
template:
|
||||
metadata:
|
||||
labels:
|
||||
role: web-frontend
|
||||
spec:
|
||||
containers:
|
||||
- name: web
|
||||
image: nginx
|
||||
ports:
|
||||
- name: web
|
||||
containerPort: 80
|
||||
volumeMounts:
|
||||
# name must match the volume name below
|
||||
- name: nfs
|
||||
mountPath: "/usr/share/nginx/html"
|
||||
volumes:
|
||||
- name: nfs
|
||||
persistentVolumeClaim:
|
||||
claimName: nfs
|
||||
9
examples/nfs/nfs-web-service.yaml
Normal file
9
examples/nfs/nfs-web-service.yaml
Normal file
@ -0,0 +1,9 @@
|
||||
kind: Service
|
||||
apiVersion: v1
|
||||
metadata:
|
||||
name: nfs-web
|
||||
spec:
|
||||
ports:
|
||||
- port: 80
|
||||
selector:
|
||||
role: web-frontend
|
||||
@ -1,6 +1,6 @@
|
||||
all: push
|
||||
|
||||
TAG = 0.3
|
||||
TAG = 0.4
|
||||
|
||||
container:
|
||||
docker build -t gcr.io/google_containers/volume-nfs . # Build new image and automatically tag it as latest
|
||||
|
||||
@ -20,7 +20,7 @@ function start()
|
||||
# prepare /etc/exports
|
||||
for i in "$@"; do
|
||||
# fsid=0: needed for NFSv4
|
||||
echo "$i *(rw,fsid=0,no_root_squash)" >> /etc/exports
|
||||
echo "$i *(rw,fsid=0,insecure,no_root_squash)" >> /etc/exports
|
||||
echo "Serving $i"
|
||||
done
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user