mirror of
https://github.com/k3s-io/kubernetes.git
synced 2025-09-12 12:48:51 +00:00
Cloning docs for 0.20.0
This commit is contained in:
Brendan Burns
117
release-0.20.0/examples/persistent-volumes/README.md
Normal file
117
release-0.20.0/examples/persistent-volumes/README.md
Normal file
@@ -0,0 +1,117 @@
|
||||
# How To Use Persistent Volumes
|
||||
|
||||
The purpose of this guide is to help you become familiar with Kubernetes Persistent Volumes. By the end of the guide, we'll have
|
||||
nginx serving content from your persistent volume.
|
||||
|
||||
This guide assumes knowledge of Kubernetes fundamentals and that you have a cluster up and running.
|
||||
|
||||
## Provisioning
|
||||
|
||||
A PersistentVolume in Kubernetes represents a real piece of underlying storage capacity in the infrastructure. Cluster administrators
|
||||
must first create storage (create their GCE disks, export their NFS shares, etc.) in order for Kubernetes to mount it.
|
||||
|
||||
PVs are intended for "network volumes" like GCE Persistent Disks, NFS shares, and AWS ElasticBlockStore volumes. ```HostPath``` was included
|
||||
for ease of development and testing. You'll create a local ```HostPath``` for this example.
|
||||
|
||||
> IMPORTANT! For ```HostPath``` to work, you will need to run a single node cluster. Kubernetes does not
|
||||
support local storage on the host at this time. There is no guarantee your pod ends up on the correct node where the ```HostPath``` resides.
|
||||
|
||||
|
||||
```
|
||||
|
||||
// this will be nginx's webroot
|
||||
mkdir /tmp/data01
|
||||
echo 'I love Kubernetes storage!' > /tmp/data01/index.html
|
||||
|
||||
```
|
||||
|
||||
PVs are created by posting them to the API server.
|
||||
|
||||
```
|
||||
|
||||
kubectl create -f examples/persistent-volumes/volumes/local-01.yaml
|
||||
kubectl get pv
|
||||
|
||||
NAME LABELS CAPACITY ACCESSMODES STATUS CLAIM
|
||||
pv0001 map[] 10737418240 RWO Available
|
||||
|
||||
```
|
||||
|
||||
## Requesting storage
|
||||
|
||||
Users of Kubernetes request persistent storage for their pods. They don't know how the underlying cluster is provisioned.
|
||||
They just know they can rely on their claim to storage and can manage its lifecycle independently from the many pods that may use it.
|
||||
|
||||
Claims must be created in the same namespace as the pods that use them.
|
||||
|
||||
```
|
||||
|
||||
kubectl create -f examples/persistent-volumes/claims/claim-01.yaml
|
||||
kubectl get pvc
|
||||
|
||||
NAME LABELS STATUS VOLUME
|
||||
myclaim-1 map[]
|
||||
|
||||
|
||||
# A background process will attempt to match this claim to a volume.
|
||||
# The eventual state of your claim will look something like this:
|
||||
|
||||
kubectl get pvc
|
||||
|
||||
NAME LABELS STATUS VOLUME
|
||||
myclaim-1 map[] Bound f5c3a89a-e50a-11e4-972f-80e6500a981e
|
||||
|
||||
|
||||
kubectl get pv
|
||||
|
||||
NAME LABELS CAPACITY ACCESSMODES STATUS CLAIM
|
||||
pv0001 map[] 10737418240 RWO Bound myclaim-1 / 6bef4c40-e50b-11e4-972f-80e6500a981e
|
||||
|
||||
```
|
||||
|
||||
## Using your claim as a volume
|
||||
|
||||
Claims are used as volumes in pods. Kubernetes uses the claim to look up its bound PV. The PV is then exposed to the pod.
|
||||
|
||||
```
|
||||
|
||||
kubectl create -f examples/persistent-volumes/simpletest/pod.yaml
|
||||
|
||||
kubectl get pods
|
||||
|
||||
POD IP CONTAINER(S) IMAGE(S) HOST LABELS STATUS CREATED
|
||||
mypod 172.17.0.2 myfrontend nginx 127.0.0.1/127.0.0.1 <none> Running 12 minutes
|
||||
|
||||
|
||||
kubectl create -f examples/persistent-volumes/simpletest/service.json
|
||||
kubectl get services
|
||||
|
||||
NAME LABELS SELECTOR IP PORT(S)
|
||||
frontendservice <none> name=frontendhttp 10.0.0.241 3000/TCP
|
||||
kubernetes component=apiserver,provider=kubernetes <none> 10.0.0.2 443/TCP
|
||||
|
||||
|
||||
```
|
||||
|
||||
## Next steps
|
||||
|
||||
You should be able to query your service endpoint and see what content nginx is serving. A "forbidden" error might mean you
|
||||
need to disable SELinux (setenforce 0).
|
||||
|
||||
```
|
||||
|
||||
curl 10.0.0.241:3000
|
||||
I love Kubernetes storage!
|
||||
|
||||
```
|
||||
|
||||
Hopefully this simple guide is enough to get you started with PersistentVolumes. If you have any questions, join
|
||||
```#google-containers``` on IRC and ask!
|
||||
|
||||
Enjoy!
|
||||
|
||||
|
||||
[]()
|
||||
|
||||
|
||||
[]()
|
||||
@@ -0,0 +1,10 @@
|
||||
kind: PersistentVolumeClaim
|
||||
apiVersion: v1
|
||||
metadata:
|
||||
name: myclaim-1
|
||||
spec:
|
||||
accessModes:
|
||||
- ReadWriteOnce
|
||||
resources:
|
||||
requests:
|
||||
storage: 3Gi
|
||||
@@ -0,0 +1,10 @@
|
||||
kind: PersistentVolumeClaim
|
||||
apiVersion: v1
|
||||
metadata:
|
||||
name: myclaim-2
|
||||
spec:
|
||||
accessModes:
|
||||
- ReadWriteOnce
|
||||
resources:
|
||||
requests:
|
||||
storage: 8Gi
|
||||
@@ -0,0 +1,17 @@
|
||||
{
|
||||
"kind": "PersistentVolumeClaim",
|
||||
"apiVersion": "v1",
|
||||
"metadata": {
|
||||
"name": "myclaim-3"
|
||||
}, "spec": {
|
||||
"accessModes": [
|
||||
"ReadWriteOnce",
|
||||
"ReadOnlyMany"
|
||||
],
|
||||
"resources": {
|
||||
"requests": {
|
||||
"storage": "10G"
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,10 @@
|
||||
{
|
||||
"kind": "Namespace",
|
||||
"apiVersion":"v1",
|
||||
"metadata": {
|
||||
"name": "myns",
|
||||
"labels": {
|
||||
"name": "development"
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,20 @@
|
||||
kind: Pod
|
||||
apiVersion: v1
|
||||
metadata:
|
||||
name: mypod
|
||||
labels:
|
||||
name: frontendhttp
|
||||
spec:
|
||||
containers:
|
||||
- name: myfrontend
|
||||
image: dockerfile/nginx
|
||||
ports:
|
||||
- containerPort: 80
|
||||
name: "http-server"
|
||||
volumeMounts:
|
||||
- mountPath: "/var/www/html"
|
||||
name: mypd
|
||||
volumes:
|
||||
- name: mypd
|
||||
persistentVolumeClaim:
|
||||
claimName: myclaim-1
|
||||
@@ -0,0 +1,19 @@
|
||||
{
|
||||
"kind": "Service",
|
||||
"apiVersion": "v1",
|
||||
"metadata": {
|
||||
"name": "frontendservice"
|
||||
},
|
||||
"spec": {
|
||||
"ports": [
|
||||
{
|
||||
"protocol": "TCP",
|
||||
"port": 3000,
|
||||
"targetPort": "http-server"
|
||||
}
|
||||
],
|
||||
"selector": {
|
||||
"name": "frontendhttp"
|
||||
}
|
||||
}
|
||||
}
|
||||
13
release-0.20.0/examples/persistent-volumes/volumes/gce.yaml
Normal file
13
release-0.20.0/examples/persistent-volumes/volumes/gce.yaml
Normal file
@@ -0,0 +1,13 @@
|
||||
kind: PersistentVolume
|
||||
apiVersion: v1
|
||||
metadata:
|
||||
name: pv0003
|
||||
spec:
|
||||
capacity:
|
||||
storage: 10Gi
|
||||
accessModes:
|
||||
- ReadWriteOnce
|
||||
- ReadOnlyMany
|
||||
gcePersistentDisk:
|
||||
pdName: "abc123"
|
||||
fsType: "ext4"
|
||||
@@ -0,0 +1,13 @@
|
||||
kind: PersistentVolume
|
||||
apiVersion: v1
|
||||
metadata:
|
||||
name: pv0001
|
||||
labels:
|
||||
type: local
|
||||
spec:
|
||||
capacity:
|
||||
storage: 10Gi
|
||||
accessModes:
|
||||
- ReadWriteOnce
|
||||
hostPath:
|
||||
path: "/tmp/data01"
|
||||
@@ -0,0 +1,14 @@
|
||||
kind: PersistentVolume
|
||||
apiVersion: v1
|
||||
metadata:
|
||||
name: pv0002
|
||||
labels:
|
||||
type: local
|
||||
spec:
|
||||
capacity:
|
||||
storage: 8Gi
|
||||
accessModes:
|
||||
- ReadWriteOnce
|
||||
hostPath:
|
||||
path: "/tmp/data02"
|
||||
persistentVolumeReclaimPolicy: Recycle
|
||||
12
release-0.20.0/examples/persistent-volumes/volumes/nfs.yaml
Normal file
12
release-0.20.0/examples/persistent-volumes/volumes/nfs.yaml
Normal file
@@ -0,0 +1,12 @@
|
||||
apiVersion: v1
|
||||
kind: PersistentVolume
|
||||
metadata:
|
||||
name: pv0003
|
||||
spec:
|
||||
capacity:
|
||||
storage: 5Gi
|
||||
accessModes:
|
||||
- ReadWriteOnce
|
||||
nfs:
|
||||
path: /tmp
|
||||
server: 172.17.0.2
|
||||
Reference in New Issue
Block a user