Install postmarketOS on Android phone and use Docker as a home server

Original Article ↗ Hacker News Discussion ↗

Scope of the Article / Title Confusion

  • Many note the article is really about flashing postmarketOS (Alpine/musl) and then installing Docker, not “Docker on Android.”
  • Some find that less exciting (“just Linux on a small computer”), others like it as a way to reuse old phones.

Android vs. Linux for Phone-as-Server

  • Android is seen as problematic for servers due to:
    • Aggressive background OOM killing that can terminate services like sshd or containers.
    • Lack of swap and difficulty marking critical services as non-killable.
  • Several argue you can “play by Android rules” (foreground services, root workarounds, system flags) or use Termux to run long-lived services, including Docker.
  • Others counter that a proper Linux distro (postmarketOS, Mobian, etc.) gives more predictable server behavior and mainline kernels.

Battery Life, Degradation, and Safety

  • Strong concern about leaving phone batteries on charge 24/7:
    • Repeated anecdotes of swollen batteries over years of continuous power.
    • Comparison to UPS batteries: lead-acid tolerates float charge; phone Li-ion does not.
  • Suggestions: remove battery entirely, fake the battery electrically, or use phones with configurable charge limits (e.g., 60–80%).
  • Coulomb counting and BMS behavior are discussed; partial charge + occasional full cycles may help, but long-term accuracy is tricky.
  • Some describe hardware “chargers/limiters” and timers; others call crude timer-based cycling unsafe and destructive.

Security and Firmware Concerns

  • Avoiding Android is also framed as a kernel-security and firmware issue:
    • Old Android devices often have outdated kernels.
    • Many proprietary firmware blobs (baseband, Wi-Fi, BT, etc.) stop receiving updates; this is seen as a risk if exposed to the internet.
  • Using mainline Linux (postmarketOS, Mobian) can improve kernel support, but firmware blobs largely remain closed and unmaintained.

Linux Phone OSes and Practicality

  • Status of Linux phones (PinePhone, Librem 5, SailfishOS) is mixed:
    • They can work as daily drivers for some, but hardware (battery life, modem reliability, performance) is often the bottleneck.
    • Android remains far more power-efficient and has better app availability.
  • Many conclude phone-as-server is appealing mainly for hardware reuse and ultra-low power, not as a general replacement for SBCs or mini PCs.