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With 8GB of RAM I don't think you can install it.

Any how check the following. Login to undercloud and check the status of nova and other services.

$ssh heat-admin@ ( BTW that is your undercloud ip from the logs you posted) $ sudo su - $ source stacrc $ nova list // if it nova is started , most probably it won't be $ ps -fe | grep -i python //-- check whether there any service started. alteast keystone should be up $ /var/log/upstrart -- look for service logs and os-collect-config log

See whether you see any error