How to update the package cache only once per playbook run?

[David Reagan]

Every time I install a package, I want to make sure I have the latest version. That means I need to run apt-get update, or it's equivalent, before I install the package. Currently I have an 'apt update_cache=yes" task running before every package install. That results in multiple 'apt-get update' calls. Is there a good way to make that only happen once per ```ansible-playbook --sudo /etc/ansible/webservices.yml``` ? 

Would ```state=latest``` update the cache only once per run? 

Would that work with other package management modules, like yum?

[Michael DeHaan]

I would just put in a common role, but see also the 'cache_valid_time' option on the apt module.

http://ansibleworks.com/docs/modules.html#apt

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[David Reagan]

Thanks, 'cache_valid_time' helps.

Though, sticking it in the common role is probably the better idea... :)