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Workload Storage

Some workloads need different volumes with different storage capacities to fit their components needs. These volumes are stored in LVM Logical Volumes <LVM LV>.

Volumes

Considering all storage volumes required for workloads running in the cluster, create a configuration as below:

metalk8s_lvm_drives_vg_metalk8s: ['/dev/vdb']
metalk8s_lvm_lvs_vg_metalk8s:
    lv01:
        size: 52G
    lv02:
        size: 52G
    lv03:
        size: 52G
    lv04:
        size: 11G
    lv05:
        size: 11G
    lv06:
        size: 11G
    lv07:
        size: 5G
    lv08:
        size: 5G

This configuration can be set on a whole Ansible group of nodes (see ansible:group_variables), or on a specific host (see ansible:host_variables).

Resize LVs

Volumes can be resized (one or several at once). Change the volume size value to a higher one and run:

ansible-playbook -b -i <inventory>/hosts -t storage playbooks/deploy.yml

Configuration layout

The configuration can be applied to groups and hosts in two different ways.

Note

Configuration files are merged for every created host or group.

To apply a configuration, create a YAML file in either (or both) group_vars and host_vars with the group name associated, or create a folder in group_vars or host_vars with several YAML files. The ansible-playbook above must be run.

Add extra LVs

It is possible to configure LVM drives and volumes for one node only.

Exemplified below, a default storage configuration (group_vars/kube-node/storage.yml):

# metalk8s_lvm_vgs = ['vg_metalk8s']
metalk8s_lvm_drives_vg_metalk8s: ['/dev/vdb']
metalk8s_lvm_lvs_vg_metalk8s:
  lv01:
      size: 52G
  lv02:
      size: 52G
  lv03:
      size: 52G

In host_vars, create a new file (host_vars/node_1.yml):

metalk8s_lvm_vgs = ['vg_metalk8s', 'mynewvg']
metalk8s_lvm_drives_mynewvg: ['/dev/vdc']
metalk8s_lvm_lvs_vg_metalk8s:
  lv01:
     size: 52G
metalk8s_lvm_lvs_mynewvg:
  lv01:
     size: 1T

Except node_1, every machine has a single vg_metalk8s with six logical volumes <LVM LV> (three specified, three default). On node_1, there are two volume groups <LVM VG> (vg_metalk8s and mynewvg) with four logical volumes on vg_metalk8s (one specified, three default) and one logical volume on mynewvg.

Note

As the volume group name becomes a prefix, several LVs can have the same name.