[ClusterLabs] What do Parenthesis Mean in a Colocation or Order?

Eric Robinson eric.robinson at psmnv.com
Thu Nov 10 03:18:06 EST 2016

I can't believe I'm still unclear in this, but the behavior seems to be different with different versions of Pacemaker.

What do the parenthesis accomplish in a statement like this?

colocation c_clust15 inf: ( p_mysql_029  p_mysql_484 p_mysql_734 ) p_vip_clust15 p_fs_clust15 p_lv_drbd0 ms_drbd0:Master 
order o_clust15 inf: ms_drbd0:promote p_lv_drbd0 p_fs_clust15 p_vip_clust15 ( p_mysql_029  p_mysql_484 p_mysql_734 )

I've noticed that on one this cluster, if any of the mysql instances fail, the whole cluster fails (vip, fs, lvm, etc.). It does not do that on other clusters.


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