[ClusterLabs] <EXT>Re: Fencing questions

Thu May 9 07:29:20 EDT 2019

Thx Klaus, appreciate your feedback.

Regards
Javier

Francisco Javier               Lopez

IT System Engineer       |      Global IT

O: +34 619 728 249<tel:+34%20619%20728%20249>    |      M: +34 619 728 249<tel:+34%20619%20728%20249>    |
        franciscojavier.lopez at solera.com<mailto:franciscojavier.lopez at solera.com>        |      Solera.com<https://www.solera.com/>

Audatex Datos, S.A.      |      Avda. de Bruselas, 36, Salida 16, A‑1 (Diversia)        ,       Alcobendas      ,       Madrid  ,       28108   ,       Spain

[cid:image339311.png at D1525B14.71452121]

On 5/9/2019 1:14 PM, Klaus Wenninger wrote:

On 5/9/19 1:03 PM, Lopez, Francisco Javier [Global IT] wrote:

Good day guys !

I'm implementing fencing in my two node cluster with this detail:

- fence_vmware_soap
- PostgreSql release 10.X
- CentOS 7.X

As far as I know, to create the resources, I can use two different ways:

- Create only one resource for both nodes, following this way:

  # pcs -f stonith_cfg stonith create fence_nodes \
  fence_vmware_soap \
  ipaddr=<VM_IP> \
  ssl_insecure=1 \
  login="<VM_user>" \
  passwd="<VM_passwd>" \
  action=reboot \
  pcmk_host_list="node_01,node_02" \
  power_wait=3 op monitor interval=60s

- Create two different resources, one for each node, following this way:

  # pcs -f stonith_cfg stonith create fence_node_01 \
  fence_vmware_soap  \
  ipaddr=<VM_IP> \
  ssl_insecure=1 \
  login="<VM_user>" \
  passwd="<VM_passwd>" \
  action=reboot \
  pcmk_host_list="node_01" \
  power_wait=3 op monitor interval=60s

  # pcs -f stonith_cfg stonith create fence_node_02 \
  fence_vmware_soap  \
  ipaddr=<VM_IP> \
  ssl_insecure=1 \
  login="<VM_user>" \
  passwd="<VM_passwd>" \
  action=reboot \
  pcmk_host_list="node_02" \
  power_wait=3 op monitor interval=60s

  With this method I understand I will have to add some constraints, etc.

Said this, my questions are:

- Which are the differences among them ? (if any).
- Is there any recommended option and why ?

For your 2-node-cluster there might be a definite reason why you'd
like to have 2 fence-resources as to prevent fence-races when both
are still alive but just don't see each other. If you make one
wait a little longer to fence you can determine which one would
rather win.
If the aim is just to prevent that they fence each other at the same
time introduction of a random delay should be fine as well.
(That is pcmk_delay_max and if you want to further tailor the delay
with astatic delay component you can use pcmk_delay_base on top.)

Klaus

Regards
Javier
Francisco Javier               Lopez

IT System Engineer       |      Global IT

O: *+34 619 728 249* <tel:+34%20619%20728%20249><tel:+34%20619%20728%20249>      |
M: *+34 619 728 249* <tel:+34%20619%20728%20249><tel:+34%20619%20728%20249>      |
        *franciscojavier.lopez at solera.com*
<mailto:franciscojavier.lopez at solera.com><mailto:franciscojavier.lopez at solera.com>       |      *Solera.com*
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Audatex Datos, S.A.      |
Avda. de Bruselas, 36, Salida 16, A‑1 (Diversia)        ,       Alcobendas      ,
Madrid  ,       28108   ,       Spain

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