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Ansible Corosync (OpenStack ready)

This role provides a support for the Corosync cluster setup.

This role supports the below protocols:

  • Multicast (udp)
  • Unicast (udpu)
  • Multiple rings

Supported distributions:

  • CentOS 7.x
  • RedHat EL 7.x
  • Debian 8.x
  • Ubuntu 14.x / 15.x / 16.x

Works with firewalld daemon and SELinux.

Because the version 1 of Corosync is "not supported" anymore, this role provides only a support for the version 2 of Corosync.

Requirements

This role needs at least 3 nodes and Ansible 2.x

To generate the Corosync auth key, you will need entropy. If the task Generating /eyc/corosync/authkey file is stuck it means that you don't have enough entropy. The workaround is to generate entropy with haveged daemon, enable this option:

corosync_haveged: true

If corosync_firewalld is set to true please make sure than firewalld package is installed and the service is started.

If corosync_selinux is set to true please make sure than policycoreutils-python package is installed.

Role Variables

The description of all options is available here: http://manpages.ubuntu.com/manpages/wily/man5/corosync.conf.5.html

    corosync_crypto_cipher | default('aes256')
    corosync_crypto_hash | default('sha256')
    corosync_rrp_mode
    corosync_netmtu | default(1500)
    corosync_vsftype | default('ykb')
    corosync_transport
    corosync_cluster_name | default('uoi')
    corosync_config_version
    corosync_ip_version | default('ipv4')
    corosync_token | default(1000)
    corosync_token_retransmit
    corosync_hold
    corosync_token_retransmits_before_loss_const
    corosync_join
    corosync_send_join
    corosync_consensus
    corosync_merge
    corosync_downcheck
    corosync_fail_recv_const
    corosync_seqno_unchanged_const
    corosync_heartbeat_failures_allowed
    corosync_max_network_delay
    corosync_window_size
    corosync_max_messages
    corosync_miss_count_const
    corosync_rrp_problem_count_timeout
    corosync_rrp_problem_count_threshold
    corosync_rrp_problem_count_mcast_threshold
    corosync_rrp_token_expired_timeout
    corosync_rrp_autorecovery_check_timeout
    corosync_provider | default('corosync_votequorum')
    corosync_expected_votes
    corosync_timestamp | default ('off')
    corosync_fileline | default('off')
    corosync_to_stderr | default('on')
    corosync_to_logfile | default('off')
    corosync_to_syslog | default('on')
    corosync_logfile
    corosync_logfile_priority | default('info')
    corosync_syslog_facility | default('daemon')
    corosync_syslog_priority | default('info')
    corosync_debug | default('off')
    corosync_subsys | default('QUORUM')
    corosync_subsys_debug | default('off')
    corosync_subsys_tags
    corosync_ipc_type | default('native')

Dependencies

None.

Example Playbook

The following example will create a Corosync cluster using multicast, if multicast is used you have to define the corosync_expected_votes variable (3 for three nodes).

As said above, if you want to configure firewalld rules, be sure that corosync_firewalld is set to true.

It's possible to use official Debian backports to have the latest Corosync version, just enable it via corosync_debian_backports set to true.

The corosync_force_regenerate_authkey allows you to regenerate the /etc/corosync/authkey file.

Multicast (1 ring)

---
corosync_firewalld: true
corosync_selinux: true
corosync_haveged: true
corosync_force_regenerate_authkey: false
corosync_debian_backports: true
corosync_expected_votes: 3

corosync_interfaces:
  - bindnetaddr: 192.168.56.0
    mcastaddr: 226.94.1.1
    mcastport: 5405
    ttl: 1

The following example will create a Corosync cluster using multicast with two rings.

Multicast (2 rings)

---
corosync_firewalld: true
corosync_selinux: true
corosync_haveged: true
corosync_force_regenerate_authkey: false
corosync_debian_backports: true
corosync_expected_votes: 3

corosync_interfaces:
  - bindnetaddr: 192.168.56.0
    mcastaddr: 226.94.1.1
    mcastport: 5405
    ttl: 1
  - bindnetaddr: 10.14.130.0
    mcastaddr: 227.94.1.1
    mcastport: 5407
    ttl: 100

Unicast (1 ring)

The following example will create a Corosync cluster using unicast with one rings.
If unicast is used, you will have to define corosync_transport: udpu and then define corosync_node_list as an array.

---
corosync_firewalld: true
corosync_selinux: true
corosync_haveged: true
corosync_force_regenerate_authkey: false
corosync_debian_backports: true
corosync_node_list:
  - ctrl01
  - ctrl02
  - ctrl03
corosync_transport: 'udpu'

corosync_interfaces:
  - bindnetaddr: 192.168.56.0
    mcastport: 5405

The following example will create a Corosync cluster using unicast with two rings.

Unicast (2 rings)

---
corosync_firewalld: true
corosync_selinux: true
corosync_haveged: true
corosync_force_regenerate_authkey: false
corosync_debian_backports: true
corosync_node_list:
  - ctrl01
  - ctrl02
  - ctrl03
corosync_transport: 'udpu'

corosync_interfaces:
  - bindnetaddr: 192.168.56.0
    mcastaddr: 226.94.1.1
    mcastport: 5405
    members:
      - 226.94.1.10
      - 226.94.1.11
      - 226.94.1.12
  - bindnetaddr: 10.14.130.0
    mcastaddr: 227.94.1.1
    mcastport: 5407
    members:
      - 227.94.1.10
      - 227.94.1.11
      - 227.94.1.12

License

Apache

Author Information

This role was created in 2016 by Gaëtan Trellu (goldyfruit).