# Customize the VM

With [Core](/dynamic-apps/docs/core), use the `vm` option to configure the
agentOS VM that serves each app:

```ts
const dynamicApps = createDynamicApps({
  // Release hooks omitted.
  vm: {
    software: [firstPackage, secondPackage],
    onAgentStderr: (event) => logger.error(event),
    onLimitWarning: (warning) => logger.warn(warning),
  },
});
```

Dynamic Apps itself controls where the app's code is placed in the VM and the
V8 heap limit. `vm` options cannot override them.
Use the separate `logger` option for application output and build events.

The VM itself is configured through agentOS:

- [Software](/agentos/docs/software): packages available inside the VM
- [Resource Limits](/agentos/docs/resource-limits): CPU, memory, and disk caps
- [Permissions](/agentos/docs/permissions): filesystem, process, and network boundaries