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ansible-drbd

An Ansible role to install/configure DRBD

NOTE: This role by default installs/configures heartbeat to provide HA for DRBD. This may change at some point to use Pacemaker rather than heartbeat. But for simple DRBD setups heartbeat is sufficient and much easier to setup. If you are interested in an Ansible Pacemaker role, I have ansible-pacemaker.

Requirements

The following requirements are needed for this role:

  • Unpartitioned disk
  • VIP

The additional required roles are included in requirements.yml which can be installed using ansible-galaxy:

ansible-galaxy install -r requirements.yml

Role Variables

---
# defaults file for ansible-drbd

drbd_common:
  disk: ''
  net: |
    cram-hmac-alg sha1;
    shared-secret "{{ drbd_network_shared_secret }}";
  handlers: ''
  startup: ''
  options: ''

drbd_disks:
  - device: /dev/drbd0
    disk: /dev/sdb
    filesystem: ext4
    partitions: 1
    mountpoint: /opt/nfs
    resource: r0
    state: present
    use_partition: /dev/sdb1

drbd_group: test_nodes

drbd_interface: enp0s8

drbd_network_shared_secret: wXE8MqVa

drbd_vip: 192.168.250.100

Additional variables include

drbd_use_heartbeat: true
drbd_use_parted: true

Platform Specific Notes

Debian Stretch and Ubuntu Xenial contains DRBD in kernel, and supports Heartbeat. They have the most out of the box support for the defaults.

DRBD packages for CentOS can be built from linbit, or from ELREPO repository. These should be included in the drbd_rpm_packages list. See vagrant-box-templates playbook.yml examples below.

Heartbeat is available for CentOS6, but not for CentOS7. Heartbeat is now optional through a toggle drbd_use_heartbeat. You will be required to handle reboots and failover by other means. Toggle is true by default.

The behaviour of loop disk partitions is has only become more consistent in later linux distributions. To maintain compatibility, the option to toggle off parted drbd_use_parted is provided. Toggle is true by default.

Unicast Mode

For platforms supporting Heartbeat, but not multi-cast UDP, we support a toggle for unicast support. Toggle is false by default.

drbd_unicast_mode: true
drbd_unicast_port: 694

Dependencies

Example Playbook

---
- hosts: test_nodes
  vars:
    etc_hosts_add_all_hosts: true
    pri_domain_name: test.vagrant.local
  roles:
    - role: ansible-ntp
    - role: ansible-etc-hosts
    - role: ansible-drbd

Testing

Testing makes use of vagrant-box-templates, where the following systems have been tested.

  • CentOS6 / CentOS7
  • Debian stretch64
  • Ubuntu xenial64

The nodes.yml and playbook.yml files have been included as working examples. See the tests/ directory for further information.

License

MIT

Author Information

Larry Smith Jr.