Rundeck can be use to run the same bash command, shell script, serverspec scripts,….etc….on multiple VMs at the same time.
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There is a bit of an overlap on which tool to use, e.g. do a “passwd {username}” using Rundeck to change someones password, or use puppet.
https://github.com/rundeck-plugins/rundeck-logstash-plugin
Also checkout:
http://logstash.net/
https://www.elastic.co/products/kibana