mirror of https://github.com/k3s-io/k3s
115 lines
5.8 KiB
Markdown
115 lines
5.8 KiB
Markdown
<!-- 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">
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<h2>PLEASE NOTE: This document applies to the HEAD of the source tree</h2>
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If you are using a released version of Kubernetes, you should
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refer to the docs that go with that version.
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<!-- TAG RELEASE_LINK, added by the munger automatically -->
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<strong>
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The latest release of this document can be found
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[here](http://releases.k8s.io/release-1.1/examples/iscsi/README.md).
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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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## Step 1. Setting up iSCSI target and iSCSI initiator
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**Setup A.** On Fedora 21 nodes
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If you use Fedora 21 on Kubernetes node, then first install iSCSI initiator on the node:
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# yum -y install iscsi-initiator-utils
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then edit */etc/iscsi/iscsid.conf* to match your iSCSI target configuration.
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I mostly followed these [instructions](http://www.server-world.info/en/note?os=Fedora_21&p=iscsi) to setup iSCSI target. and these [instructions](http://www.server-world.info/en/note?os=Fedora_21&p=iscsi&f=2) to setup iSCSI initiator.
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**Setup B.** On Unbuntu 12.04 and Debian 7 nodes on Google Compute Engine (GCE)
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GCE does not provide preconfigured Fedora 21 image, so I set up the iSCSI target on a preconfigured Ubuntu 12.04 image, mostly following these [instructions](http://www.server-world.info/en/note?os=Ubuntu_12.04&p=iscsi). My Kubernetes cluster on GCE was running Debian 7 images, so I followed these [instructions](http://www.server-world.info/en/note?os=Debian_7.0&p=iscsi&f=2) to set up the iSCSI initiator.
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## Step 2. Creating the pod with iSCSI persistent storage
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Once you have installed iSCSI initiator and new Kubernetes, you can create a pod based on the example *iscsi.json*. In the pod JSON, you need to provide *targetPortal* (the iSCSI target's **IP** address and *port* if not the default port 3260), target's *iqn*, *lun*, and the type of the filesystem that has been created on the lun, and *readOnly* boolean. No initiator information is required.
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If you want to use an iSCSI offload card or other open-iscsi transports besides tcp, setup an iSCSI interface and provide *iscsiInterface* in the pod JSON. The default name for an iscsi iface (open-iscsi parameter iface.iscsi\_ifacename) is in the format transport\_name.hwaddress when generated by iscsiadm. See [open-iscsi](http://www.open-iscsi.org/docs/README) or [openstack](http://docs.openstack.org/kilo/config-reference/content/iscsi-iface-config.html) for detailed configuration information.
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**Note:** If you have followed the instructions in the links above you
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may have partitioned the device, the iSCSI volume plugin does not
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currently support partitions so format the device as one partition.
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Make sure you have the correct device name then run the following as
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root to format it:
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```console
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mkfs.ext4 /dev/<name of device>
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```
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Once your pod is created, run it on the Kubernetes master:
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```console
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kubectl create -f ./your_new_pod.json
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```
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Here is my command and output:
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```console
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# kubectl create -f examples/iscsi/iscsi.json
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# kubectl get pods
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NAME READY STATUS RESTARTS AGE
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iscsipd 2/2 RUNNING 0 2m
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```
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On the Kubernetes node, verify the mount output
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```console
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# mount |grep kub
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/dev/sdb on /var/lib/kubelet/plugins/kubernetes.io/iscsi/10.0.2.15:3260-iqn.2001-04.com.example:storage.kube.sys1.xyz-lun-0 type ext4 (ro,relatime,data=ordered)
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/dev/sdb on /var/lib/kubelet/pods/f527ca5b-6d87-11e5-aa7e-080027ff6387/volumes/kubernetes.io~iscsi/iscsipd-ro type ext4 (ro,relatime,data=ordered)
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/dev/sdc on /var/lib/kubelet/plugins/kubernetes.io/iscsi/10.0.2.15:3260-iqn.2001-04.com.example:storage.kube.sys1.xyz-lun-1 type ext4 (rw,relatime,data=ordered)
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/dev/sdc on /var/lib/kubelet/pods/f527ca5b-6d87-11e5-aa7e-080027ff6387/volumes/kubernetes.io~iscsi/iscsipd-rw type ext4 (rw,relatime,data=ordered)
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```
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If you ssh to that machine, you can run `docker ps` to see the actual pod.
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```console
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# docker ps
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CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
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f855336407f4 kubernetes/pause "/pause" 6 minutes ago Up 6 minutes k8s_iscsipd-ro.d130ec3e_iscsipd_default_f527ca5b-6d87-11e5-aa7e-080027ff6387_5409a4cb
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3b8a772515d2 kubernetes/pause "/pause" 6 minutes ago Up 6 minutes k8s_iscsipd-rw.ed58ec4e_iscsipd_default_f527ca5b-6d87-11e5-aa7e-080027ff6387_d25592c5
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```
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Run *docker inspect* and verify the container mounted the host directory into the their */mnt/iscsipd* directory.
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```console
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# docker inspect --format '{{ range .Mounts }}{{ if eq .Destination "/mnt/iscsipd" }}{{ .Source }}{{ end }}{{ end }}' f855336407f4
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/var/lib/kubelet/pods/f527ca5b-6d87-11e5-aa7e-080027ff6387/volumes/kubernetes.io~iscsi/iscsipd-ro
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# docker inspect --format '{{ range .Mounts }}{{ if eq .Destination "/mnt/iscsipd" }}{{ .Source }}{{ end }}{{ end }}' 3b8a772515d2
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/var/lib/kubelet/pods/f527ca5b-6d87-11e5-aa7e-080027ff6387/volumes/kubernetes.io~iscsi/iscsipd-rw
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```
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<!-- BEGIN MUNGE: GENERATED_ANALYTICS -->
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[]()
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<!-- END MUNGE: GENERATED_ANALYTICS -->
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