Environment Review

Retrieve Node Names

Gather the Kubernetes names of all nodes within your cluster. We will use the node names in a subsequent step.

kubectl get nodes -ojson | jq -r '.items[].metadata.labels."kubernetes.io/hostname"'

Example Output

root@node1:~/nexqloud# kubectl get nodes -ojson | jq -r '.items[].metadata.labels."kubernetes.io/hostname"'

node1
node2
node3

Ensure Unformatted Drives

• Rook-Ceph will automatically discover free, raw partitions. Use the following command on the host that will serve persistent storage to ensure the intended partition as no file system.

lsblk -f

Example/Expected Output

• In this example we have can see that the xvdf is unformatted and ready for persistent storage use

root@node2:~# lsblk -f
NAME     FSTYPE   FSVER LABEL           UUID                                 FSAVAIL FSUSE% MOUNTPOINTS

xvda
├─xvda1  ext4     1.0   cloudimg-rootfs e7879b8a-f914-4210-998a-d47604682e59   39.4G    18% /
├─xvda14
└─xvda15 vfat     FAT32 UEFI            594C-4810                              99.1M     5% /boot/efi
xvdf

LVM Package

Ceph OSDs have a dependency on LVM in the following scenarios:

• OSDs are created on raw devices or partitions

• If encryption is enabled (encryptedDevice: true in the cluster CR)

• A metadata device is specified

For persistent storage use the OSDs are created on raw partitions. Issue the following command on each node serving persistent storage.

apt-get install -y lvm2