Alpine Linux is a community developed operating system designed for routers, firewalls, VPNs, VoIP boxes and servers. It was designed with security in mind; it has proactive security features like PaX and SSP that prevent security holes in the software to be exploited. The C library used is musl and the base tools are all in BusyBox. Those are normally found in embedded systems and are smaller than the tools found in GNU/Linux systems.
VIRTUAL
Similar to standard. Slimmed down kernel. Optimized for virtual systems.
XEN
Built-in support for Xen Hypervisor. Includes packages targeted at Xen usage. Use for Xen Dom0.
https://alpinelinux.org/
https://distrowatch.com/table.php?distribution=alpine
Spiral Model Applications
The project manager can be confident in the advisability of using the spiral model if there is at least one of the following list of reasons for this:
when developing a new function or a new series of products, discover more here (https://www.mindk.com/industries/adtech/);
when significant changes are expected, for example, in research or research work;