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An XDA Developers author reports running Pi-hole and Unbound on a Raspberry Pi Zero 2 W with 512MB of memory, using DietPi and Docker. The setup routes home DNS requests through the Pi for ad and tracker blocking, but it can interrupt new website access if the device or services fail.
An XDA Developers author says a Raspberry Pi Zero 2 W with 512MB of memory can run Pi-hole and Unbound as a home DNS server, filtering many ads and tracking domains while avoiding a public DNS provider for routine resolution. The account describes one personal setup, not a benchmark or independently verified test, and notes that a failure could disrupt access to new websites.
The author runs the services in Docker containers on DietPi, a lightweight operating system. According to the account, DietPi uses about 70MB of memory on the board. The Zero 2 W reserves some of its memory for graphics, leaving about 410MB available to the setup; Docker uses about 50MB, the author says. After deployment, the author reports that roughly 40% of memory remained idle.
Pi-hole acts as a DNS sinkhole: it checks device requests against blocklists and can block requests associated with ads and tracking. Unbound handles DNS resolution by querying authoritative DNS servers, instead of sending routine requests through a public resolver such as Google or Cloudflare. The author says combining the two services is intended to add privacy, although it does not by itself describe or guarantee privacy across all internet activity.
To direct household traffic to the Pi, the author changed the router’s DNS setting to the Raspberry Pi’s address. The article also describes adding a self-healing script that checks whether Pi-hole is running, whether Unbound can resolve queries and whether the internet connection is available. It is configured to reboot the board only after multiple checks fail, rather than treating a reboot as the first response.
Too Slow for Everything? Give the Pi Zero One Perfect Job.
An XDA Developers author describes using a Raspberry Pi Zero 2 W as an always-on home DNS server. With Pi-hole and Unbound, the small board can filter domain requests and resolve them without relying on a public DNS provider for routine lookups.
From home device to DNS answer
The router sends household DNS requests to the Pi. Each part has a distinct role, from the lightweight operating system through filtering and recursive resolution.
Router points to Pi
DHCP settings direct the home network’s DNS requests to the Raspberry Pi address.
Pi-hole checks lists
Requests are checked against blocklists; listed ad and tracking domains can be blocked.
Unbound resolves
It queries authoritative DNS servers for routine resolution instead of a public resolver.
Devices receive answers
Filtering can cover multiple home devices without configuring a separate blocker on each one.
Enough room for a focused service
The author reports using DietPi, Docker, Pi-hole and Unbound on the 512 MB board. Some memory is reserved for graphics, leaving about 410 MB available to the setup. The figures describe one configuration and may vary with software, settings and network demands.
Four layers, one narrow purpose
The author prefers containers for maintenance, dependency isolation and troubleshooting. The described setup runs locally on DietPi; remote access through Tailscale is mentioned as an option but was not enabled.
DietPi
A lightweight operating system. The author reports roughly 70 MB of memory use on this board.
Docker
Runs the services in containers, which the author chose to help manage dependencies and maintenance.
Pi-hole
Acts as a DNS sinkhole, checking requests against blocklists and blocking listed domains.
Unbound
Performs recursive DNS resolution by querying authoritative servers for routine requests.
Practical promise, bounded evidence
“It runs Pi-hole and saves me from tracking, ads, and public DNS logging.”
XDA Developers author Abhishek
These are the author’s descriptions of a personal setup. The article provides no independent measurements of filtering rates, speed, uptime or privacy outcomes. Unbound changes DNS resolution; it does not establish privacy across all internet activity or guarantee that all tracking is blocked.
Plan for the day the Pi is unavailable
The Pi becomes part of the household’s internet infrastructure when the router relies on it for DNS. The author describes checks for Pi-hole, Unbound resolution and internet connectivity, with a reboot only after multiple checks fail.
DNS outage
If the Pi or its services fail, devices may be unable to look up new domain names. A second Pi-hole and Unbound server is one possible backup.
Fallback trade-off
A public DNS fallback may restore resolution, but requests sent to it can bypass the filtering and privacy aims of this setup.
Recovery is not proven
The article gives no uptime figures or measurement period, and does not say how the script handles failures such as corrupted storage or a failed board.
Key questions
What is the Zero 2 W doing?
Serving as a home DNS server with Pi-hole and Unbound, rather than as a general-purpose computer.
Can it run on 512 MB?
The author reports that it does, with about 40% of memory idle after deployment. This is one personal setup, not an independent test.
What if the Pi stops working?
DNS lookups may fail until service returns. A second server can add redundancy; a public fallback can bypass filtering for some requests.
Can it be reached remotely?
The article mentions Tailscale for Tailnet access and DNS use, but says this option was not enabled in the reported setup.
A Low-Cost Board for Home DNS
The account offers a practical use for a small board that may feel limited beside more powerful Raspberry Pi models: handling a narrow, always-on network task rather than general computing. DNS filtering at the router can apply to multiple devices on a home network, without installing a separate ad-blocking tool on each one.
The trade-off is that the Pi becomes part of the household’s internet infrastructure. If it stops responding and the router relies on it for DNS, devices may be unable to look up new domain names. The author points to a second Pi-hole and Unbound server as one possible backup, while warning that including a public DNS fallback could bypass the filtering and privacy aims for requests sent to that resolver.
Raspberry Pi Zero 2 W starter kit case power supply
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How the DNS Setup Fits Together
The author says the Raspberry Pi Zero 2 W was a first single-board computer and that a second unit was later bought for a separate purpose. The article contrasts its modest capabilities with boards such as the Raspberry Pi 4 Model B and Raspberry Pi 5, while presenting DNS service as a task where low memory use matters more than raw computing power.
The setup uses DietPi, Docker, Pi-hole and Unbound. DietPi provides the operating system; Docker runs the applications in containers; Pi-hole applies blocklists to DNS requests; and Unbound performs recursive resolution. The author prefers containers to direct package installation, citing maintenance, dependency isolation and troubleshooting as reasons. The described router uses DHCP and was configured to send DNS requests to the Pi.
The article also mentions Tailscale as an option for reaching the server remotely or directing devices in a Tailnet to use Pi-hole. The author says that remote-use feature was not implemented in this setup. The report is based on the author’s experience and does not provide independent measurements of filtering rates, speed, reliability or privacy outcomes.
“it runs Pi-hole and saves me from tracking, ads, and public DNS logging.”
— XDA Developers author Abhishek
Raspberry Pi Zero 2 W micro USB power supply
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Reliability and Privacy Limits
The article does not give a measurement period, uptime figures, DNS response benchmarks or a comparison with other hardware. Its memory figures and reliability description are the author’s reported experience, and results may vary with software versions, configuration and network demands.
It is also unclear how often the self-healing script detects problems or whether it has been tested against failures such as corrupted storage or a failed board. A single Pi remains a single point of failure for DNS if the router has no working alternative. Unbound changes how DNS queries are resolved, but the source does not establish that the full connection is private or that all tracking is blocked.
Raspberry Pi Zero 2 W case with heatsink
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Keeping the DNS Server Available
The account’s next operational concern is maintaining service: monitoring Pi-hole, Unbound and internet connectivity, then using a reboot only when several checks indicate a persistent problem. Users following this approach would also need to check that their router continues to use the intended DNS address and decide how to handle outages.
The author does not announce a new product, release or scheduled follow-up. The setup remains a personal configuration described in the Oct. 23 article; no independent test or wider deployment is reported.
microSD card for Raspberry Pi Zero 2 W
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Key Questions
What is the Raspberry Pi Zero 2 W being used for?
The XDA author uses it as a home DNS server running Pi-hole and Unbound, rather than as a general-purpose computer.
What do Pi-hole and Unbound each do?
Pi-hole checks DNS requests against blocklists and can block requests for listed domains. Unbound handles DNS resolution by querying authoritative DNS servers instead of relying on a public DNS resolver for routine requests.
Does the setup work on 512MB of memory?
The author reports running the services on a 512MB Raspberry Pi Zero 2 W with DietPi and Docker, with about 40% of memory idle after deployment. Those figures describe one personal setup, not an independent test.
What happens if the Raspberry Pi stops working?
If the router depends on the Pi for DNS, devices may have trouble accessing new websites until DNS service returns. A second DNS server could provide redundancy, but using a public resolver as a fallback may mean some requests bypass Pi-hole filtering.
Can the setup be accessed remotely?
The article says Tailscale can be installed to make the server reachable within a Tailnet and can be used to direct Tailnet devices to Pi-hole. The author says this option was not enabled in the setup described.
Source: XDA Developers
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