forked from rook/rook
Travis Nielsen
a251959061
The docs were in need of some restructuring wrt prerequisites. They were mingled with general k8s and Ceph requirements. For clarity, we need to separate the ceph prereqs from general k8s requirements. There is now only a single prereqs page. All other topics should be found under other sections, such as specific to Ceph. Having subtopics under the general prereqs caused users to frequently not even notice the main prereqs topic. Signed-off-by: Travis Nielsen <tnielsen@redhat.com>
154 lines
7.2 KiB
Markdown
154 lines
7.2 KiB
Markdown
---
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title: Ceph Storage
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weight: 300
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indent: true
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---
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{% include_relative branch.liquid %}
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# Ceph Storage Quickstart
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This guide will walk you through the basic setup of a Ceph cluster and enable you to consume block, object, and file storage
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from other pods running in your cluster.
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## Minimum Version
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Kubernetes **v1.10** or higher is supported by Rook.
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## Prerequisites
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To make sure you have a Kubernetes cluster that is ready for `Rook`, you can [follow these instructions](k8s-pre-reqs.md).
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In order to configure the storage cluster, at least one of these local storage options are required:
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- Raw devices (no partitions or formatted filesystems)
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- Raw partitions (no formatted filsystem)
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- PVs available from a storage class in `block` mode
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## TL;DR
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If you're feeling lucky, a simple Rook cluster can be created with the following kubectl commands and [example yaml files](https://github.com/rook/rook/blob/{{ branchName }}/cluster/examples/kubernetes/ceph). For the more detailed install, skip to the next section to [deploy the Rook operator](#deploy-the-rook-operator).
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```console
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git clone --single-branch --branch {{ branchName }} https://github.com/rook/rook.git
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cd cluster/examples/kubernetes/ceph
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kubectl create -f common.yaml
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kubectl create -f operator.yaml
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kubectl create -f cluster.yaml
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```
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After the cluster is running, you can create [block, object, or file](#storage) storage to be consumed by other applications in your cluster.
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### Production Environments
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For production environments it is required to have local storage devices attached to your nodes.
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In this walk-through, the requirement of local storage devices is relaxed so you can get a cluster up and running
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as a "test" environment to experiment with Rook. See the [Ceph examples](ceph-examples.md) for more details.
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## Deploy the Rook Operator
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The first step is to deploy the Rook operator. Check that you are using the [example yaml files](https://github.com/rook/rook/blob/{{ branchName }}/cluster/examples/kubernetes/ceph) that correspond to your release of Rook. For more options, see the [examples documentation](ceph-examples.md).
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```console
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cd cluster/examples/kubernetes/ceph
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kubectl create -f common.yaml
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kubectl create -f operator.yaml
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## verify the rook-ceph-operator is in the `Running` state before proceeding
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kubectl -n rook-ceph get pod
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```
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You can also deploy the operator with the [Rook Helm Chart](helm-operator.md).
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## Create a Rook Ceph Cluster
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Now that the Rook operator is running we can create the Ceph cluster. For the cluster to survive reboots,
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make sure you set the `dataDirHostPath` property that is valid for your hosts. For more settings, see the documentation on [configuring the cluster](ceph-cluster-crd.md).
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Create the cluster:
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```console
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kubectl create -f cluster.yaml
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```
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Use `kubectl` to list pods in the `rook-ceph` namespace. You should be able to see the following pods once they are all running.
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The number of osd pods will depend on the number of nodes in the cluster and the number of devices configured.
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If you did not modify the `cluster.yaml` above, it is expected that one OSD will be created per node.
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The CSI, `rook-ceph-agent`, and `rook-discover` pods are also optional depending on your settings.
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> If the `rook-ceph-mon`, `rook-ceph-mgr`, or `rook-ceph-osd` pods are not created, please refer to the
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> [Ceph common issues](ceph-common-issues.md) for more details and potential solutions.
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```console
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$ kubectl -n rook-ceph get pod
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NAME READY STATUS RESTARTS AGE
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csi-cephfsplugin-provisioner-d77bb49c6-n5tgs 5/5 Running 0 140s
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csi-cephfsplugin-provisioner-d77bb49c6-v9rvn 5/5 Running 0 140s
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csi-cephfsplugin-rthrp 3/3 Running 0 140s
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csi-rbdplugin-hbsm7 3/3 Running 0 140s
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csi-rbdplugin-provisioner-5b5cd64fd-nvk6c 6/6 Running 0 140s
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csi-rbdplugin-provisioner-5b5cd64fd-q7bxl 6/6 Running 0 140s
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rook-ceph-agent-4zkg8 1/1 Running 0 140s
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rook-ceph-crashcollector-minikube-5b57b7c5d4-hfldl 1/1 Running 0 105s
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rook-ceph-mgr-a-64cd7cdf54-j8b5p 1/1 Running 0 77s
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rook-ceph-mon-a-694bb7987d-fp9w7 1/1 Running 0 105s
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rook-ceph-mon-b-856fdd5cb9-5h2qk 1/1 Running 0 94s
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rook-ceph-mon-c-57545897fc-j576h 1/1 Running 0 85s
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rook-ceph-operator-85f5b946bd-s8grz 1/1 Running 0 92m
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rook-ceph-osd-0-6bb747b6c5-lnvb6 1/1 Running 0 23s
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rook-ceph-osd-1-7f67f9646d-44p7v 1/1 Running 0 24s
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rook-ceph-osd-2-6cd4b776ff-v4d68 1/1 Running 0 25s
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rook-ceph-osd-prepare-node1-vx2rz 0/2 Completed 0 60s
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rook-ceph-osd-prepare-node2-ab3fd 0/2 Completed 0 60s
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rook-ceph-osd-prepare-node3-w4xyz 0/2 Completed 0 60s
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rook-discover-dhkb8 1/1 Running 0 140s
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```
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To verify that the cluster is in a healthy state, connect to the [Rook toolbox](ceph-toolbox.md) and run the
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`ceph status` command.
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* All mons should be in quorum
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* A mgr should be active
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* At least one OSD should be active
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* If the health is not `HEALTH_OK`, the warnings or errors should be investigated
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```console
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$ ceph status
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cluster:
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id: a0452c76-30d9-4c1a-a948-5d8405f19a7c
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health: HEALTH_OK
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services:
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mon: 3 daemons, quorum a,b,c (age 3m)
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mgr: a(active, since 2m)
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osd: 3 osds: 3 up (since 1m), 3 in (since 1m)
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...
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```
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If the cluster is not healthy, please refer to the [Ceph common issues](ceph-common-issues.md) for more details and potential solutions.
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## Storage
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For a walkthrough of the three types of storage exposed by Rook, see the guides for:
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* **[Block](ceph-block.md)**: Create block storage to be consumed by a pod
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* **[Object](ceph-object.md)**: Create an object store that is accessible inside or outside the Kubernetes cluster
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* **[Shared Filesystem](ceph-filesystem.md)**: Create a filesystem to be shared across multiple pods
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## Ceph Dashboard
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Ceph has a dashboard in which you can view the status of your cluster. Please see the [dashboard guide](ceph-dashboard.md) for more details.
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## Tools
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We have created a toolbox container that contains the full suite of Ceph clients for debugging and troubleshooting your Rook cluster. Please see the [toolbox readme](ceph-toolbox.md) for setup and usage information. Also see our [advanced configuration](advanced-configuration.md) document for helpful maintenance and tuning examples.
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## Monitoring
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Each Rook cluster has some built in metrics collectors/exporters for monitoring with [Prometheus](https://prometheus.io/).
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To learn how to set up monitoring for your Rook cluster, you can follow the steps in the [monitoring guide](./ceph-monitoring.md).
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## Teardown
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When you are done with the test cluster, see [these instructions](ceph-teardown.md) to clean up the cluster.
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