The following files need to be defined on the build machine

${BUILD_HOME}/providerscripts/server/cloud-init/${CLOUDHOST}/authenticator.yaml
${BUILD_HOME}/providerscripts/server/cloud-init/${CLOUDHOST}/autoscaler.yaml
${BUILD_HOME}/providerscripts/server/cloud-init/${CLOUDHOST}/webserver.yaml
${BUILD_HOME}/providerscripts/server/cloud-init/${CLOUDHOST}/database.yaml

Within these files the initialisation process for the server type is defined.

Various placeholder tokens are held within these defining files such as

XXXXSERVER_USERXXXX
XXXXSERVER_USER_PASSWORDXXXX
XXXXSSH_PUBLIC_KEYXXXX
XXXXALGORITHMXXXX
XXXXSSH_PRIVATE_KEYXXXX

And each of these unique tokens is replaced with live data by the script

${BUILD_HOME}/initscripts/InitialiseCloudInit.sh

Once these placeholder tokens have been replaced as part of the build intialisation, the updated copy of the file is available as

${BUILD_HOME}/runtimedata/${CLOUDHOST}/${BUILD_IDENTIFIER}/autoscaler_configuration_settings.dat
${BUILD_HOME}/runtimedata/${CLOUDHOST}/${BUILD_IDENTIFIER}/webserver_configuration_settings.dat
${BUILD_HOME}/runtimedata/${CLOUDHOST}/${BUILD_IDENTIFIER}/database_configuration_settings.dat

These files containing live data are then passed and used when the cli call is made to provision the machine from the script:

${BUILD_HOME}/providerscripts/server/CreateServer.sh

The newly provisioned server machine will then provision itself and run the live cloud-init script that you have provided

If you want to see the log output the log files are kept under

/var/log/cloud-init*

On the respective machines

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The same process needs to happen on the autoscaler machines when they provision new webservers.

The original file with placeholder tokens in it is kept at:

${HOME}/providerscripts/server/cloud-init/${CLOUDHOST}/webserver.yaml

When a scaling event happens, the script

${HOME}/autoscaler/InitialiseCloudInit.sh

is called which replaces the placeholders and makes the live script available at:

${HOME}/runtime/cloud-init/webserver.yaml

When the script

${HOME}/providerscripts/server/CreateServer.sh

is called, the live cloud-init script is passed to the cli call