Repository containing documentation related to kubernetes and ceph
The first CephFS you create, will be set as the default filesystem. When mounting a the filesystem using something like this mount -t ceph {device-string}={path-to-mounted} {mount-point} -o {key-value-args} {other-args} the default filesystem will be mounted if no filesystem name is specified. The new way to mount a fileystem on a host is like this mount -t ceph <name>@<fsid>.<fs_name>=/ /mnt/mycephfs.
The standard way to mount a Ceph FS volume inside a pod is shown here: https://github.com/kubernetes/examples/blob/master/volumes/cephfs/cephfs.yaml. This type of volume definition allows you to set monitors, and mount path, but not which Ceph filesystem within your cluster to mount, it will only allow the default.
To mount a non default filesystem, you must first create a Persistent Volume and then a PVC pointing to the cephfs.
Within the Persistent Volume, you can specify standard posix mount options, as the persistent volume uses the old cephFS mount syntax behind the scenes, we can add -o fs={your_fs_name} to the mount.
apiVersion: v1
kind: PersistentVolume
metadata:
name: cephfs-pv
labels:
name: cephfs-pv
spec:
storageClassName: manual
capacity:
storage: 10Gi # doesn't matter what you enter here
mountOptions:
- "fs={your_fs_name}"
accessModes:
- ReadOnlyMany
persistentVolumeReclaimPolicy: Retain
cephfs:
monitors:
- 10.16.154.78:6789
- 10.16.154.82:6789
- 10.16.154.83:6789
user: admin
secretRef:
name: ceph-secret #secret containing your ceph access credentials, more info here: https://github.com/kubernetes/examples/tree/master/volumes/cephfs
readOnly: true
path: "path/within/fs"And the PVC:
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: cephfs-pvc
spec:
storageClassName: manual
accessModes:
- ReadOnlyMany
resources:
requests:
storage: 10Gi
selector:
matchLabels:
- name: cephfs-pvAnd then finally creating a pod and mounting it within:
apiVersion: v1
kind: Pod
metadata:
name: ubuntu
labels:
name: ubuntu
spec:
volumes:
- name: cephfs-pvc
persistentVolumeClaim:
claimName: cephfs-pvc
containers:
- name: ubuntu
image: ubuntu:latest
resources:
limits:
memory: "1Gi"
cpu: "1000m"
volumeMounts:
- mountPath: "/data"
name: cephfs-pvc
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