Ansible Role: Device Mapper Multipath

An Ansible Role that installs multipath on RHEL/CentOS, Debian/Ubuntu.

Role Variables

Available variables are listed below, along with default values (see defaults/main.yml):

multipath_enablerepo: ""

The repository to use when installing multipath (only used on RHEL/CentOS systems). If you'd like later versions of multipath than are available in the OS's core repositories, use a custom repository.

multipath_dir: "/etc/multipath"
multipath_config_path: "/etc/multipath.conf"
multipath_dropin_path: "/etc/multipath/conf.d"

The default multipath directory, the main multipath configuration file, and the default drop-in directory for additional configuration files.

multipath_service: multipathd

The name of the multipath daemon's systemd service.

multipath_config:
  defaults:
    config_dir: "{{ multipath_dropin_path }}"
  multipaths:
    multipath:

The default configuration of the multipath.conf file. This configuration will be merged with the configuration from the multipath_files variable.
The default configuration also includes config_dir parameter with the multipath_dropin_path as the default variable.
Note that this is not necessary in the latest versions of multipath, as the config_dir parameter has been deprecated.
See: https://github.com/opensvc/multipath-tools/pull/31

multipath_packages:
  - [platform-specific]

The list of packages to be installed. This defaults to a set of platform-specific packages for RedHat or Debian-based systems (see vars/RedHat.yml and vars/Debian.yml for the default values).

multipath_state: started

Set initial multipath daemon state to be enforced when this role is run. This should generally remain started, but you can set it to stopped if you need to fix the multipath config during a playbook run or otherwise would not like multipath started at the time this role is run.

multipath_enabled: true

Set the multipath daemon service boot time status. This should generally remain true, but you can set it to false if you need to run Ansible while leaving the service disabled.

multipath_restart_state: reloaded

Set the multipath daemon state after updates to configuration files. The reloaded state causes the daemon to re-read the configuration files. You can also set this option to restart, which will fully restart the multipath daemon.

multipath_packages_state: present

If you have enabled any additional repositories, you may want an easy way to upgrade versions. You can set this to latest (combined with multipath_enablerepo on RHEL) and can directly upgrade to a different multipath version from a different repo (instead of uninstalling and reinstalling multipath).

Dependencies

None.

Example inventory

all:
  vars:
    multipath_files:
      # /etc/multipath.conf
      multipath:
        defaults:
          verbosity: 4
          polling_interval: 10
          max_polling_interval: 30
          reassign_maps: "no"
          prio: "sysfs"

        blacklist:
          devnode:
            - "!^(sd[a-z]|dasd[a-z])"
            - "^sd[a-z]"

          wwid:
            - "26353900f02796769"

          device:
            - vendor: "IBM"
              product: "3S42"

            - vendor: "DELL"
              product: "Universal Xport"

          property:
            - "ID_ATA"

          protocol:
            - "scsi:unspec"
            - "undef"
        
        blacklist_exceptions:
          wwid:
            - "3600d0230000000000e13955cc3757803"
          property:
            - "(SCSI_IDENT_|ID_WWN)"

        devices:
          - device:
              vendor: "NVME"
              product: "Pure Storage FlashArray"
              path_selector: "queue-length 0"
              path_grouping_policy: group_by_prio
              prio: ana
              failback: immediate
              fast_io_fail_tmo: 10
              user_friendly_names: "no"
              no_path_retry: 0
              features: 0
              dev_loss_tmo: 60

        multipaths:
          multipath:
            - wwid: 3624a93705598f4dec0624d4e00001020
              alias: EXAMPLE01
              prio: const
            - { wwid: "3624a93705598f4dec0624d4e00001021", alias: "EXAMPLE02" }

        overrides:
          dev_loss_tmo: 60
          fast_io_fail_tmo: 8
          protocol:
            type: "scsi:iscsi"
            dev_loss_tmo: 60
            fast_io_fail_tmo: 120

      dropin_file01:
        multipaths:
          multipath:
            - { wwid: "3624a93705598f4dec0624d4e00001022", alias: "EXAMPLE03" }
            - { wwid: "3624a93705598f4dec0624d4e00001023", alias: "EXAMPLE04" }

      dropin_file02:
        multipaths:
          multipath:
            - { wwid: "3624a93705598f4dec0624d4e00001024", alias: "EXAMPLE05" }
            - { wwid: "3624a93705598f4dec0624d4e00001025", alias: "EXAMPLE06" }
databases:
  hosts:
    db01:
      ansible_host: db01.example.com

Example playbook

- hosts: databases
  roles:
    - { role: Spybull.multipath }

License

MIT / BSD

Author Information

This role was created in 2024 by spybull.