View source for Provision Docker Storage on a Dedicated Block Device

=Internal=

* [[OpenShift_3.5_Installation#Ny62gV|OpenShift 3.5 Installation]]

=Overview=

=Procedure=

Provision an unformatted block device. For this example, it will be referred to as /dev/sdb.

Create one partition that spans the entire device. Either [[fdisk]] or [[sfdisk]] can be used. This is how the partition [[Fdisk#Create_a_Partition_that_Spans_the_Entire_Device|is created with fdisk]].

The procedure will create a /dev/sdb1 partition.

[[Wipefs#Erase_all_Signatures|Erase all signatures]] from the partition:

<pre>
wipefs -a /dev/sdb1
</pre>

[[pvcreate#Initialize_Partition_for_use_by_LVM|Initialize the partition for use by LVM]] by creating a physical volume:

<pre>
pvcreate /dev/sdb1
</pre>

[[Vgcreate#Create_a_Volume_Group|Create the volume group]], conventionally named "docker_vg", using the partition prepared by the previous steps /dev/sdb1:

<pre>
vgcreate docker_vg /dev/sdb1
</pre>

[[lvcreate#Create_a_Thin_Pool_Logical_Volume|Crate the LVM thin pool]]:

<pre>
lvcreate -y --type thin-pool --zero n -c 512K --poolmetadatasize 1041s -L 500M -n docker-pool docker_vg
</pre>

[[lvchange#Enable_Logical_Volume_Auto-Extension|Enable auto-extension]] (optional):

Store:

<pre>
activation {
	thin_pool_autoextend_threshold=60
	thin_pool_autoextend_percent=20

}
</pre>

in /etc/lvm/profile/docker_vg--docker-pool-extend.profile and then:

<pre>
lvchange --metadataprofile docker_vg--docker-pool-extend  docker_vg/docker-pool
</pre>

<pre>
lvchange --metadataprofile docker_vg--docker-pool-extend  docker_vg/docker-pool
</pre>

Write /etc/sysconfig/docker-storage:

<pre>
DOCKER_STORAGE_OPTIONS="--storage-driver devicemapper --storage-opt dm.fs=xfs --storage-opt dm.thinpooldev=/dev/mapper/docker_vg-docker--pool --storage-opt dm.use_deferred_removal=true"
</pre>








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Continue with /Users/ovidiu/projects/openshift/docker-storage-setup, function: setup_storage()












Verify your configuration. You should have a dm.thinpooldev value in the /etc/sysconfig/docker-storage file and a docker-pool logical volume:

<pre>
# cat /etc/sysconfig/docker-storage
DOCKER_STORAGE_OPTIONS=--storage-opt dm.fs=xfs --storage-opt
dm.thinpooldev=/dev/mapper/docker--vg-docker--pool

# lvs
  LV          VG   Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  docker-pool rhel twi-a-t---  9.29g             0.00   0.12
</pre>

Before using Docker or OpenShift Container Platform, verify that the docker-pool logical volume is large enough to meet your needs. The docker-pool volume should be 60% of the available volume group and will grow to fill the volume group via LVM monitoring.

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