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selecting a builder
A builder is a machine running monitor periphery and docker. Any server connected to monitor can be chosen as the builder for a build.
Building on a machine running production software is usually not a great idea, as this process can use a lot of system resources. It is better to start up a temporary cloud machine dedicated for the build, then shut it down when the build is finished. Right now monitor supports AWS ec2 for this task.
AWS builder
You can choose to build on AWS on the "builder" tab on the build's page. From here you can select preconfigured AMIs to use as a base to build the image. These must be configured in the monitor core configuration along with other information like defaults to use, AWS credentials, etc. This is explained on the core setup page.