Provision Docker Storage on a Dedicated Block Device: Difference between revisions

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lvcreate -y --type thin-pool --zero n -c 512K --poolmetadatasize 1041s -L 500M -n docker-pool docker_vg
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This results in the following links in /dev/mapper:
[[lvchange#Enable_Logical_Volume_Auto-Extension|Enable auto-extension]] (optional):
 
Store:


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lrwxrwxrwx.  1 root root      7 May 23 10:51 docker_vg-docker--pool -> ../dm-3
activation {
lrwxrwxrwx.  1 root root      7 May 23 10:51 docker_vg-docker--pool_tdata -> ../dm-2
thin_pool_autoextend_threshold=60
lrwxrwxrwx.  1 root root      7 May 23 10:51 docker_vg-docker--pool_tmeta -> ../dm-1
thin_pool_autoextend_percent=20
 
}
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Write /etc/sysconfig/docker-storage:
in /etc/lvm/profile/docker_vg--docker-pool-extend.profile and then:


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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"
lvchange --metadataprofile docker_vg--docker-pool-extend  docker_vg/docker-pool
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Verify that the LV is correctly created:


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#lvs


  LV          VG        Attr      LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  docker-pool docker_vg twi-a-t--- 500.00m            0.00  0.88
  root        main_vg  -wi-ao----  7.00g
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Write /etc/sysconfig/docker-storage:
 
 
 
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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:


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# cat /etc/sysconfig/docker-storage
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"
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
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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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Latest revision as of 18:40, 23 May 2017

Internal

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 is created with fdisk.

The procedure will create a /dev/sdb1 partition.

Erase all signatures from the partition: 

wipefs -a /dev/sdb1

Initialize the partition for use by LVM by creating a physical volume: 

pvcreate /dev/sdb1

Create the volume group, conventionally named "docker_vg", using the partition prepared by the previous steps /dev/sdb1: 

vgcreate docker_vg /dev/sdb1

Crate the LVM thin pool: 

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

Enable auto-extension (optional):

Store: 

activation {
	thin_pool_autoextend_threshold=60
	thin_pool_autoextend_percent=20

}

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

lvchange --metadataprofile docker_vg--docker-pool-extend  docker_vg/docker-pool

Verify that the LV is correctly created: 

#lvs

  LV          VG        Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  docker-pool docker_vg twi-a-t--- 500.00m             0.00   0.88
  root        main_vg   -wi-ao----   7.00g

Write /etc/sysconfig/docker-storage: 

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"
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