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For each VM, the last instruction in the Heat template is to run <component_name>_install.sh, which install software dependencies such as docker, Java, make, gcc, git, etc. This script also downloads and runs another script, called <component_name>_vm_init.sh, which is in charge of downloading and running docker containers.
For detailed information about Heat templates and their installation, please refer to ONAP Installation in Vanilla OpenStack.
What should ONAP teams to onboard a new component? Just provide the VM specs that they want, we will create the VM accordingly. We will also create <component_name>_install.sh