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fuel-docs/pages/reference-architecture/ha-notes/0130-how-fuel-deploys-ha.rst

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How Fuel Deploys HA

How Fuel Deploys HA

Fuel installs Corosync service, configures corosync.conf, and includes the Pacemaker service plugin into /etc/corosync/service.d. Then Corosync service starts and spawns corresponding Pacemaker processes. Fuel configures the cluster properties of Pacemaker and then injects resource configurations for virtual IPs, HAProxy, MySQL and Neutron agent resources:

primitive p_haproxy ocf:pacemaker:haproxy \
  op monitor interval="20" timeout="30" \
  op start interval="0" timeout="30" \
  op stop interval="0" timeout="30"
primitive p_mysql ocf:mirantis:mysql \
  op monitor interval="60" timeout="30" \
  op start interval="0" timeout="450" \
  op stop interval="0" timeout="150"
primitive p_neutron-dhcp-agent ocf:mirantis:neutron-agent-dhcp \
  op monitor interval="20" timeout="30" \
  op start interval="0" timeout="360" \
  op stop interval="0" timeout="360" \
  params tenant="services" password="neutron" username="neutron" \
  os_auth_url="http://10.107.2.254:35357/v2.0" \
  meta is-managed="true"
primitive p_neutron-l3-agent ocf:mirantis:neutron-agent-l3 \
  op monitor interval="20" timeout="30" \
  op start interval="0" timeout="360" \
  op stop interval="0" timeout="360" \
  params tenant="services" password="neutron" syslog="true" username="neutron" \
  debug="true" os_auth_url="http://10.107.2.254:35357/v2.0" \
  meta is-managed="true" target-role="Started"
primitive p_neutron-metadata-agent ocf:mirantis:neutron-agent-metadata \
  op monitor interval="60" timeout="30" \
  op start interval="0" timeout="30" \
  op stop interval="0" timeout="30"
primitive p_neutron-openvswitch-agent ocf:pacemaker:neutron-agent-ovs \
  op monitor interval="20" timeout="30" \
  op start interval="0" timeout="480" \
  op stop interval="0" timeout="480"
primitive vip__management ocf:heartbeat:IPaddr2 \
  op monitor interval="2" timeout="30" \
  op start interval="0" timeout="30" \
  op stop interval="0" timeout="30" \
  params nic="br-mgmt" iflabel="ka" ip="10.107.2.254"
primitive vip__public ocf:heartbeat:IPaddr2 \
  op monitor interval="2" timeout="30" \
  op start interval="0" timeout="30" \
  op stop interval="0" timeout="30" \
  params nic="br-ex" iflabel="ka" ip="172.18.94.46"
clone clone_p_haproxy p_haproxy \
  meta interleave="true"
clone clone_p_mysql p_mysql \
  meta interleave="true" is-managed="true"
clone clone_p_neutron-metadata-agent p_neutron-metadata-agent \
  meta interleave="true" is-managed="true"
clone clone_p_neutron-openvswitch-agent p_neutron-openvswitch-agent \
  meta interleave="true"

And ties them with Pacemaker colocation resource:

colocation dhcp-with-metadata inf: p_neutron-dhcp-agent \
  clone_p_neutron-metadata-agent
colocation dhcp-with-ovs inf: p_neutron-dhcp-agent \
  clone_p_neutron-openvswitch-agent
colocation dhcp-without-l3 -100: p_neutron-dhcp-agent p_neutron-l3-agent
colocation l3-with-metadata inf: p_neutron-l3-agent clone_p_neutron-metadata-agent
colocation l3-with-ovs inf: p_neutron-l3-agent clone_p_neutron-openvswitch-agent
order dhcp-after-metadata inf: clone_p_neutron-metadata-agent p_neutron-dhcp-agent
order dhcp-after-ovs inf: clone_p_neutron-openvswitch-agent p_neutron-dhcp-agent
order l3-after-metadata inf: clone_p_neutron-metadata-agent p_neutron-l3-agent
order l3-after-ovs inf: clone_p_neutron-openvswitch-agent p_neutron-l3-agent