# Who to use oneflow to request custom vms vars

**URL:** <https://forum.opennebula.io/t/who-to-use-oneflow-to-request-custom-vms-vars/3193>\
**Category:** Integration Support\
**Created:** [October 27, 2016, 3:47pm UTC](https://forum.opennebula.io/t/who-to-use-oneflow-to-request-custom-vms-vars/3193 "2016-10-27T15:47:47Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![panterrap](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.opennebula.io/panterrap/32/6409_2.png) [@panterrap](https://forum.opennebula.io/u/panterrap)\
**Post date:** [October 27, 2016, 3:47pm UTC](https://forum.opennebula.io/t/who-to-use-oneflow-to-request-custom-vms-vars/3193/1 "2016-10-27T15:47:47Z")

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Someone as a solution to integrate easy customs mutex(on/off) services!

Can request OneFlow vm custom variables?  
Which are default defined variables to use in oneflow?  
Are these variables autosended with onegate through onecontext?

Can OneFlow differentiate values of each vm var for each role?  
Who to access to these values? Example: role.template[instance].var ?

The value used by OneFlow is the sum(var) of all instantiated machines?