72 lines
2.5 KiB
Markdown
72 lines
2.5 KiB
Markdown
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---
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title: Starting an Ozone Cluster
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weight: 1
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menu:
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main:
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parent: Starting
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weight: 3
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---
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<!---
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License. See accompanying LICENSE file.
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-->
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Before we boot up the Ozone cluster, we need to initialize both SCM and Ozone Manager.
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{{< highlight bash >}}
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ozone scm -init
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{{< /highlight >}}
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This allows SCM to create the cluster Identity and initialize its state.
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The ```init``` command is similar to Namenode format. Init command is executed only once, that allows SCM to create all the required on-disk structures to work correctly.
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{{< highlight bash >}}
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ozone --daemon start scm
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{{< /highlight >}}
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Once we know SCM is up and running, we can create an Object Store for our use. This is done by running the following command.
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{{< highlight bash >}}
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ozone om -createObjectStore
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{{< /highlight >}}
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Once Ozone manager has created the Object Store, we are ready to run the name
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services.
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{{< highlight bash >}}
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ozone --daemon start om
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{{< /highlight >}}
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At this point Ozone's name services, the Ozone manager, and the block service SCM is both running.
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**Please note**: If SCM is not running
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```createObjectStore``` command will fail. SCM start will fail if on-disk data structures are missing. So please make sure you have done both ```init``` and ```createObjectStore``` commands.
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Now we need to start the data nodes. Please run the following command on each datanode.
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{{< highlight bash >}}
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ozone --daemon start datanode
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{{< /highlight >}}
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At this point SCM, Ozone Manager and data nodes are up and running.
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***Congratulations!, You have set up a functional ozone cluster.***
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-------
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If you want to make your life simpler, you can just run
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{{< highlight bash >}}
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ozone scm -init
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ozone om -createObjectStore
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start-ozone.sh
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{{< /highlight >}}
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This assumes that you have set up the slaves file correctly and ssh
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configuration that allows ssh-ing to all data nodes. This is the same as the
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HDFS configuration, so please refer to HDFS documentation on how to set this
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up.
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