Eu implementei um cluster simples de dois nós com o DRBD e alguns recursos Mestre / Escravo baseados em rede.
Usando o ethmonitor RA, configuro o failover sempre que o nó Principal / Principal perder o link no dispositivo físico Ethernet especificado, restringindo a função do Mestre apenas nos nós nos quais a variável ethmon é "1".
Algo está dando errado com minha restrição de colocation, no entanto - se eu configurar o recurso DRBDFS para monitorar o link em eth1, desconectar eth1 no nó Primário causará um failover como esperado - todos os recursos Master serão rebaixados para "escravo" e promovidos no nó oposto, e o DRBDFS "normal" se move para o outro nó como esperado.
No entanto, se eu colocar a mesma restrição ethmonitor no recurso Mestre / Escravo baseado em rede, somente esse recurso específico falhará - o DRBDFS permanece no mesmo local (embora ele pare) como os outros recursos Mestre / Escravo. / p>
Isso cheira como um problema de restrição para mim - alguém sabe o que eu estou fazendo errado?
PCS antes:
Cluster name: node1.hostname.com_node2.hostname.com
Stack: corosync
Current DC: node2.hostname.com_0 (version 1.1.16-12.el7_4.4-94ff4df) - partition with quorum
Last updated: Tue Mar 20 16:25:47 2018
Last change: Tue Mar 20 16:00:33 2018 by hacluster via crmd on node2.hostname.com_0
2 nodes configured
11 resources configured
Online: [ node1.hostname.com_0 node2.hostname.com_0 ]
Full list of resources:
Master/Slave Set: drbd.master [drbd.slave]
Masters: [ node1.hostname.com_0 ]
Slaves: [ node2.hostname.com_0 ]
drbdfs (ocf::heartbeat:Filesystem): Started node1.hostname.com_0
Master/Slave Set: inside-interface-sameip.master [inside-interface-sameip.slave]
Masters: [ node1.hostname.com_0 ]
Slaves: [ node2.hostname.com_0 ]
Master/Slave Set: outside-interface-sameip.master [outside-interface-sameip.slave]
Masters: [ node1.hostname.com_0 ]
Slaves: [ node2.hostname.com_0 ]
Clone Set: monitor-eth1-clone [monitor-eth1]
Started: [ node1.hostname.com_0 node2.hostname.com_0 ]
Clone Set: monitor-eth2-clone [monitor-eth2]
Started: [ node1.hostname.com_0 node2.hostname.com_0 ]
Daemon Status:
corosync: active/enabled
pacemaker: active/enabled
pcsd: inactive/disabled
PCS após:
Cluster name: node1.hostname.com_node2.hostname.com
Stack: corosync
Current DC: node2.hostname.com_0 (version 1.1.16-12.el7_4.4-94ff4df) - partition with quorum
Last updated: Tue Mar 20 16:29:40 2018
Last change: Tue Mar 20 16:00:33 2018 by hacluster via crmd on node2.hostname.com_0
2 nodes configured
11 resources configured
Online: [ node1.hostname.com_0 node2.hostname.com_0 ]
Full list of resources:
Master/Slave Set: drbd.master [drbd.slave]
Masters: [ node1.hostname.com_0 ]
Slaves: [ node2.hostname.com_0 ]
drbdfs (ocf::heartbeat:Filesystem): Stopped
Master/Slave Set: inside-interface-sameip.master [inside-interface-sameip.slave]
Masters: [ node2.hostname.com_0 ]
Stopped: [ node1.hostname.com_0 ]
Master/Slave Set: outside-interface-sameip.master [outside-interface-sameip.slave]
Masters: [ node1.hostname.com_0 ]
Slaves: [ node2.hostname.com_0 ]
Clone Set: monitor-eth1-clone [monitor-eth1]
Started: [ node1.hostname.com_0 node2.hostname.com_0 ]
Clone Set: monitor-eth2-clone [monitor-eth2]
Started: [ node1.hostname.com_0 node2.hostname.com_0 ]
Daemon Status:
corosync: active/enabled
pacemaker: active/enabled
pcsd: inactive/disabled
Esta é a seção "restrições" do meu CIB:
<constraints>
<rsc_colocation id="pcs_rsc_colocation_set_drbdfs_set_drbd.master_inside-interface-sameip.master_outside-interface-sameip.master" score="INFINITY">
<resource_set id="pcs_rsc_set_drbdfs" sequential="false">
<resource_ref id="drbdfs"/>
</resource_set>
<resource_set id="pcs_rsc_set_drbd.master_inside-interface-sameip.master_outside-interface-sameip.master" role="Master" sequential="false">
<resource_ref id="drbd.master"/>
<resource_ref id="inside-interface-sameip.master"/>
<resource_ref id="outside-interface-sameip.master"/>
</resource_set>
</rsc_colocation>
<rsc_order id="pcs_rsc_order_set_drbd.master_inside-interface-sameip.master_outside-interface-sameip.master_set_drbdfs" kind="Serialize" symmetrical="false">
<resource_set action="promote" id="pcs_rsc_set_drbd.master_inside-interface-sameip.master_outside-interface-sameip.master-1" role="Master">
<resource_ref id="drbd.master"/>
<resource_ref id="inside-interface-sameip.master"/>
<resource_ref id="outside-interface-sameip.master"/>
</resource_set>
<resource_set id="pcs_rsc_set_drbdfs-1">
<resource_ref id="drbdfs"/>
</resource_set>
</rsc_order>
<rsc_location id="location-inside-interface-sameip.master" rsc="inside-interface-sameip.master">
<rule id="location-inside-interface-sameip.master-rule" score="-INFINITY">
<expression attribute="ethmon_result-eth1" id="location-inside-interface-sameip.master-rule-expr" operation="ne" value="1"/>
</rule>
</rsc_location>
<rsc_location id="location-outside-interface-sameip.master" rsc="outside-interface-sameip.master">
<rule id="location-outside-interface-sameip.master-rule" score="-INFINITY">
<expression attribute="ethmon_result-eth2" id="location-outside-interface-sameip.master-rule-expr" operation="ne" value="1"/>
</rule>
</rsc_location>
</constraints>