[ClusterLabs] 答复: How to change the "pcs constraint colocation set"

[范国腾]

Thank you, Tomas. I know how to remove a constraint " pcs constraint colocation remove <source resource id> <target resource id> ". Is there a command to delete a constraint colocation set?

-----邮件原件-----
发件人: Users [mailto:users-bounces at clusterlabs.org] 代表 Tomas Jelinek
发送时间: 2018年5月15日 15:42
收件人: users at clusterlabs.org
主题: Re: [ClusterLabs] How to change the "pcs constraint colocation set"

Dne 15.5.2018 v 05:25 范国腾 napsal(a):
> Hi,
> 
> We have two VIP resources and we use the following command to make them in different node.
> 
> pcs constraint colocation set pgsql-slave-ip1 pgsql-slave-ip2 
> setoptions score=-1000
> 
> Now we add a new node into the cluster and we add a new VIP too. We want the constraint colocation set to change to be:
> pcs constraint colocation set pgsql-slave-ip1 pgsql-slave-ip2 
> pgsql-slave-ip3 setoptions score=-1000
>   
> How should we change the constraint set?
> 
> Thanks

Hi,

pcs provides no commands for editing existing constraints. You can create a new constraint and remove the old one. If you want to do it as a single change from pacemaker's point of view, follow this procedure:

[root at node1:~]# pcs cluster cib cib1.xml [root at node1:~]# cp cib1.xml cib2.xml [root at node1:~]# pcs -f cib2.xml constraint list --full Location Constraints:
Ordering Constraints:
Colocation Constraints:
   Resource Sets:
     set pgsql-slave-ip1 pgsql-slave-ip2
(id:pcs_rsc_set_pgsql-slave-ip1_pgsql-slave-ip2) setoptions score=-1000
(id:pcs_rsc_colocation_set_pgsql-slave-ip1_pgsql-slave-ip2)
Ticket Constraints:
[root at node1:~]# pcs -f cib2.xml constraint remove
pcs_rsc_colocation_set_pgsql-slave-ip1_pgsql-slave-ip2
[root at node1:~]# pcs -f cib2.xml constraint colocation set
pgsql-slave-ip1 pgsql-slave-ip2 pgsql-slave-ip3 setoptions score=-1000 [root at node1:~]# pcs cluster cib-push cib2.xml diff-against=cib1.xml CIB updated


Pcs older than 0.9.156 does not support the diff-against option, you can do it like this:

[root at node1:~]# pcs cluster cib cib.xml
[root at node1:~]# pcs -f cib.xml constraint list --full Location Constraints:
Ordering Constraints:
Colocation Constraints:
   Resource Sets:
     set pgsql-slave-ip1 pgsql-slave-ip2
(id:pcs_rsc_set_pgsql-slave-ip1_pgsql-slave-ip2) setoptions score=-1000
(id:pcs_rsc_colocation_set_pgsql-slave-ip1_pgsql-slave-ip2)
Ticket Constraints:
[root at node1:~]# pcs -f cib.xml constraint remove
pcs_rsc_colocation_set_pgsql-slave-ip1_pgsql-slave-ip2
[root at node1:~]# pcs -f cib.xml constraint colocation set pgsql-slave-ip1
pgsql-slave-ip2 pgsql-slave-ip3 setoptions score=-1000 [root at node1:~]# pcs cluster cib-push cib.xml CIB updated


Regards,
Tomas
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