drbd

DRBD

Description

This role deploy a basic DRBD cluster to share storage between multiple nodes. Main target is to be combined with high availability role.

Note: This role is for now considered experimental and should be used with care in production environment.

Instructions

To allow role to find needed packages, you need to add elrepo repositories on all the nodes:

dnf -y install https://www.elrepo.org/elrepo-release-8.el8.elrepo.noarch.rpm

Then define resources to be used by creating a file in the inventory with the following content, tuned according to your needs:

drbd_resources:
  - name: resource0        # Name of the shared resource
    nodes:                 # List of nodes that share this resource, and ip to be used
      ha1: 10.10.0.1
      ha2: 10.10.0.2
    metadisk: internal     # See https://manpages.debian.org/unstable/drbd-utils/drbd.conf-8.3.5.en.html, internal by default
    disk: /dev/sdb1        # Local disk to be used as physical device
    device: /dev/drbd1     # Virtual disk exposed on hosts

It is also possible to ask role to use filesystem Ansible module to manage FS (if not used, i.e. no Primary active):

drbd_resources:
  - name: resource1        # Name of the shared resource
    nodes:                 # List of nodes that share this resource, and ip to be used
      ha1: 10.10.0.1
      ha2: 10.10.0.2
    metadisk: internal     # See https://manpages.debian.org/unstable/drbd-utils/drbd.conf-8.3.5.en.html, internal by default
    disk: /dev/sdb1        # Local disk to be used as physical device
    device: /dev/drbd1     # Virtual disk exposed on hosts
  - name: resource2
    nodes:
      ha1: 10.10.0.1
      ha2: 10.10.0.2
    metadisk: internal
    disk: /dev/sdb2
    device: /dev/drbd2
    filesystem:
      fstype: ext4
      opts: -O mmp -E mmp_update_interval=5

Once cluster is running, resources status can be monitored using the following two commands:

drbdadm status
drbdmon

Changelog

• 1.0.0: Role creation. Benoit Leveugle [email protected]