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Choose Discourse for the most mature, feature-rich community and give it at least a 4 GB VPS for comfortable production use. On a 1–2 GB VPS, Flarum, NodeBB, or MyBB are safer starting points, although Flarum and NodeBB have conflicting third-party sizing claims that you should validate under your own workload. Every option leaves you responsible for Linux administration, updates, backups, security, and SMTP email.
Quick verdict: which forum should you install?
There is no universal winner because the software with the deepest moderation, trust-and-safety, search, notification, and extension features also has the largest operational footprint. Match the platform to your VPS memory, technical comfort, and community goals rather than choosing from a generic top-ten list.
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| Platform | Best fit | Official installation and stack | Published sizing evidence | Main trade-off |
|---|---|---|---|---|
| Discourse | A serious, feature-heavy community where mature workflows matter more than a tiny idle footprint | Docker-only officially; PostgreSQL, Redis 7, Ruby 3.2 or newer inside the stack | Official minimum 1 GB RAM with swap; cloud guidance 2 GB or more, 2 or more cores, and 20 GB or more disk; independent production guidance commonly starts at 4 GB RAM | Most complete and proven, but heaviest and most demanding during asset builds |
| Flarum | A clean, modern forum on a small PHP-friendly VPS | PHP 8.3 or newer, Apache with mod_rewrite or Nginx, Composer, and MySQL, MariaDB, SQLite, or PostgreSQL | No official RAM number; community reports and guides mention about 1 GB, while comparison pages range from 512 MB to 4–8 GB | Light interface and conventional PHP hosting, but extension and capacity planning require testing |
| NodeBB | Real-time interaction, chat-like notifications, and a JavaScript stack | Node.js 22 or newer; MongoDB 5 or newer or Redis 7.2 or newer; Docker optional | No official RAM number; one vendor lists 1,024 MB, and an older guide warns dependency installation can exceed 512 MB | Flexible and responsive, but Node/database operations and version compatibility add administration work |
| MyBB | A cost-conscious traditional forum with modest expectations | Hardware requirements were not stated in the available material | No verified RAM or CPU figure | Established and open source, but you must verify current server and PHP requirements before deployment |
| phpBB | A conventional, mature bulletin board with a long operating history | Hardware requirements were not stated in the available material | No verified RAM or CPU figure | Stable and functional according to community commentary, but capacity still depends on your extensions and traffic |
For a larger feature-heavy community, Discourse is the safest proven choice when you can supply a 4 GB VPS and maintain its containerized stack. For a small VPS, begin with Flarum, NodeBB, or MyBB, monitor memory and response time, and leave room for database growth. phpBB remains a reasonable traditional choice, but its requirements were not documented well enough here to promise a particular VPS size.
What self-hosting a forum actually requires
Self-hosted means the application, database, uploads, logs, and backups run on infrastructure you control, such as a rented virtual private server. You receive control over the domain, data retention, extensions, and upgrade schedule. You also inherit every task a hosted service would normally perform: operating-system patching, firewalling, TLS certificates, database maintenance, storage expansion, monitoring, abuse handling, and recovery after a failed update.
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Baseline VPS checklist
- A 64-bit Linux distribution supported by the chosen software and a non-root administrative account with SSH access.
- Enough memory for the application, database, web server, background jobs, and temporary build processes. Leave headroom instead of treating the vendor minimum as a production target.
- Fast persistent storage. Forum uploads, search indexes, database write-ahead logs, and backups grow continuously, so a small boot disk can become the first failure point.
- A domain name with DNS pointed to the VPS, HTTPS configured, and a firewall allowing only the services you actually expose.
- An SMTP service that accepts authenticated outbound mail. Account activation, password resets, notifications, and moderation alerts are unusable when mail silently fails.
- Automated off-server backups with a tested restore procedure. A second copy on the same VPS does not protect you from disk loss, account suspension, or operator error.
Why minimum specifications are not targets
Minimums usually describe whether an installer can complete or whether a nearly empty site can start. Real communities add image processing, search indexing, notification queues, scheduled jobs, moderation logs, extensions, and concurrent readers. A forum can appear healthy at idle and still fail when an update compiles assets or when a popular thread produces a burst of requests. Measure peak memory, swap activity, database latency, and disk usage during a trial rather than trusting a single number from an aggregator.
Discourse: the strongest all-rounder, with the largest footprint
Discourse is generally regarded as the most mature and feature-dense platform in this shortlist. It is designed for communities that need polished discussion flows, robust moderation, trust and participation controls, notifications, search, and a broad extension ecosystem. That completeness is why it is also the heaviest option to run on a small VPS.
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Official requirements and architecture
Discourse’s official installation guide supports Docker-based installations only. You need SSH access to a 64-bit Linux server with Docker support. The same guide lists a minimum of 1 GB RAM with swap, recommends a dual-core CPU, and lists 10 GB of disk as a minimum. Its application stack includes PostgreSQL, Redis 7, and Ruby 3.2 or newer inside the managed container environment.
The official cloud installation guidance recommends a more comfortable tier: at least 2 GB RAM, two or more CPU cores, and 20 GB or more of disk. Those figures are a practical baseline for a new site, not a guarantee for a busy community with large uploads or many plugins. Independent production guidance commonly suggests 4 GB RAM, 2–4 virtual CPUs, and a 40 GB SSD, with an idle stack around 1.4–1.8 GB RAM. Those latter figures are third-party observations rather than Discourse requirements.
Where Discourse uses memory
The asset-build step is often the highest-memory operation. Third-party guidance describes 2 GB as a comfortable build environment and 4 GB as a safer choice for a busy forum with plugins. A 1 GB machine may boot with swap yet become painfully slow or fail when compiling assets, restoring a backup, or running concurrent jobs. Swap prevents an immediate out-of-memory kill, but it does not turn slow disk into RAM; sustained swapping is a performance warning.
When Discourse is the right choice
- You expect many concurrent readers, a growing archive, or complex moderation workflows.
- You prefer an integrated product over assembling many PHP or Node extensions.
- You can allocate at least the official cloud tier and preferably a 4 GB production VPS.
- You are comfortable operating Docker containers and following Discourse’s upgrade and backup procedures.
Choose another platform when your budget is fixed at 1 GB, when your host does not support Docker, or when you want a conventional shared-PHP deployment.
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Flarum: a lean PHP forum with flexible database choices
Flarum is a modern, uncluttered forum built for a conventional PHP deployment. Its interface can feel substantially lighter than a full Discourse installation, and its extension model lets you add capabilities as your community needs them. The cost is that you must evaluate extension compatibility, PHP modules, and real memory use yourself.
Official software prerequisites
Flarum’s installation documentation requires PHP 8.3 or newer and these extensions: curl, dom, fileinfo, gd, json, mbstring, openssl, pdo_mysql, tokenizer, zip, and session. The web server can be Apache with mod_rewrite or Nginx. You need SSH access and Composer for command-line extension management.
Supported database minimums are MySQL 5.7 or 8.0.30 and newer, MariaDB 10.3 or newer, SQLite 3.35.0 or newer, and PostgreSQL 10.0 or newer. For new installations, the documentation recommends MySQL 8.4 LTS, MariaDB 11.8 LTS, or PostgreSQL 15–17. Select one database deliberately and keep it on a supported release; changing databases later is more work than choosing correctly at the start.
How much RAM does Flarum need?
Flarum publishes no official RAM requirement in the cited documentation. A community forum report describes smooth operation on 1 GB for a small team, and one third-party guide says 1 GB or more. Other comparison pages claim anything from 512 MB to 4–8 GB and 2–4 virtual CPUs. Because those figures conflict and may describe different traffic levels or extension sets, treat 1 GB as an experiment for a small site, not a promise. A 2 GB VPS gives PHP workers, the database, and the operating system more breathing room.
Flarum deployment considerations
- Confirm every required PHP extension before running Composer; a missing module commonly appears as an installer error rather than a clear capacity problem.
- Use Nginx or Apache rewrite rules exactly as the current Flarum documentation specifies so discussion URLs resolve correctly.
- Limit PHP worker counts to the memory available. Too many workers can exhaust a small VPS even when average CPU use is low.
- Test your chosen extensions together on a staging copy. An extension that is harmless alone can increase query volume, background work, or upgrade risk when combined with others.
NodeBB: a real-time Node.js option with two database paths
NodeBB suits communities that value live-feeling updates, notification streams, and a JavaScript-based server. Its official README requires Node.js 22 or newer and either MongoDB 5 or newer or Redis 7.2 or newer. Redis is required when clustering. Docker is optional, so you can run a native Node.js process under your preferred service manager or use containers.
Version accuracy matters
Cached copies of the README disagree: one shows Node.js 20 or newer while the current requirement states Node.js 22 or newer. Treat the current release documentation and package metadata as authoritative when you install. Do not pin an old tutorial’s Node or database versions simply because its commands still appear in search results. The same warning applies to archived documentation pages that describe NodeBB 1.x and obsolete dependencies.
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Installation flow
The documented setup flow is intentionally short:
- Clone the NodeBB repository on your VPS and install the current supported Node.js release.
- Run
./nodebb setup. The wizard asks for the database connection, creates an administrator account, and sets the listening port; the default port is 4567. - Start the application, then place a reverse proxy in front of it for HTTPS, compression, and a public domain.
- Configure a process supervisor so NodeBB restarts after a reboot and inspect logs after every upgrade.
Keep the database on the same private network or host unless you have a reason to separate it. Restrict MongoDB or Redis from public internet access, create credentials with only the required permissions, and verify that your backup job captures both the database and uploaded assets.
NodeBB memory expectations
NodeBB has no official RAM figure in the cited README. One VPS vendor lists 1,024 MB as a requirement, while an older tutorial warns that dependency installation can need more than 512 MB and recommends enabling swap. These are starting points, not production guarantees. A 1 GB VPS may work for a small, lightly extended forum after installation, but 2 GB is a safer starting point when the database, Node process, reverse proxy, and build tools share the machine.
MyBB and phpBB: traditional choices when simplicity is the priority
MyBB is described as open-source, self-hosted, and cost-effective for business forums. phpBB is a mature, free bulletin-board platform; community commentary characterizes phpBB and SMF as stable and functional. The available material does not provide verified hardware requirements for either project, so do not infer that either will fit a particular 512 MB or 1 GB plan without checking the current release documentation and testing your extensions.
These platforms can be attractive when your users expect a classic forum layout, when you need a familiar PHP hosting model, or when you are migrating an older community whose moderation and theme workflows already match a traditional bulletin board. Their lower apparent complexity does not remove the need for updates, database backups, spam controls, HTTPS, and SMTP testing.
Requirements compared side by side
| Decision point | Discourse | Flarum | NodeBB | MyBB / phpBB |
|---|---|---|---|---|
| Official install model | Docker only | PHP application with Composer; Apache or Nginx | Native Node.js or optional Docker | Not established in the supplied specifications |
| Application runtime | Ruby 3.2 or newer inside the stack | PHP 8.3 or newer | Node.js 22 or newer | Check the current project release |
| Database | PostgreSQL in the stack | MySQL, MariaDB, SQLite, or PostgreSQL | MongoDB 5 or newer or Redis 7.2 or newer | Check the current project release |
| Cache / queue | Redis 7 in the stack | Not specified as a separate requirement | Redis is required for clustering | Not stated |
| Official RAM minimum | 1 GB with swap | Not stated | Not stated | Not stated |
| More conservative production starting point | 4 GB RAM, 2–4 vCPU, 40 GB SSD from third-party guidance | At least 1 GB is reported for a small site; verify and consider 2 GB | 1,024 MB is listed by one vendor; consider 2 GB for headroom | Measure on a trial VPS |
| SMTP | Operationally required for activation, resets, and notifications | Operationally required for account mail | Operationally required for account mail | Operationally required for account mail |
The table separates official requirements from third-party guidance because mixing them creates false precision. A number without its source and conditions is not a capacity plan.
Choose by VPS size and community profile
About 1 GB RAM
Start with Flarum, NodeBB, or MyBB on paper, but keep the installation small. Disable unnecessary extensions, enable swap, and avoid compiling or restoring large datasets during peak traffic. Flarum’s 1 GB report concerns a small team, and NodeBB’s 1,024 MB figure comes from a vendor listing, so both need measurement. Discourse’s 1 GB minimum includes swap and is not a comfortable production recommendation.
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About 2 GB RAM
Flarum or NodeBB have more practical headroom for a modest community, a database, and a reverse proxy. Discourse’s official cloud guidance starts here, but asset builds and plugins can still make 2 GB tight. Keep backups and build jobs scheduled for quiet periods and watch swap-in activity.
4 GB or more
Discourse becomes the most proven choice for a feature-heavy community. Reserve disk for uploads, PostgreSQL growth, logs, and backup staging. Flarum and NodeBB also benefit from this size when you expect indexing, extensions, chat-like activity, or migration work.
High traffic or uncertain growth
Separate the database and application only after monitoring shows a bottleneck; splitting too early increases networking and backup complexity. First establish metrics for RAM, CPU, disk I/O, database connections, request latency, error rate, and email queue failures. Scale vertically before introducing clustering unless a measured workload requires horizontal capacity.
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- Confirm compatibility. Read the current release documentation for runtime, database, operating system, and extension versions. NodeBB’s current README, for example, requires Node.js 22 or newer even though cached copies show older requirements.
- Create a disposable staging VPS. Use the same memory size and operating-system image as production. A trial reveals whether installation, asset compilation, and database restoration fit your limits.
- Harden the host. Update the operating system, use SSH keys, disable password login where appropriate, enable a firewall, and expose only SSH, HTTP, and HTTPS.
- Install the platform using its supported path. Use Discourse’s Docker-based installer, Flarum’s PHP and Composer process, or NodeBB’s repository and
./nodebb setupwizard. Avoid copying commands from archived tutorials that target obsolete versions. - Configure the public edge. Put HTTPS and a reverse proxy in front of the application, set the canonical hostname, and verify uploaded files and large requests.
- Configure SMTP before inviting users. Send activation, password-reset, notification, and moderation test messages to multiple mail providers. Check SPF, DKIM, DMARC, bounce handling, and the provider’s sending limits.
- Load realistic data. Import a representative backup or generate test users, images, and threads. Observe peak memory during indexing, asset builds, and backup restoration.
- Automate operations. Schedule database and upload backups, retain multiple generations off-server, monitor certificate expiry and disk space, and document a restore drill.
- Open registration gradually. Start with trusted testers, review logs and moderation tools, and raise VPS resources before a public launch if swap or queue latency rises.
Email, backups, and maintenance are part of the product
Every platform in this shortlist needs working SMTP in practical use. The claim is based on third-party guidance for Discourse; the cited official documentation does not present SMTP as a formal hardware prerequisite. Nevertheless, without reliable mail, new users cannot activate accounts, users cannot reset passwords, and notification workflows break. Treat email delivery as a launch blocker, not an optional enhancement.
Backups must include the database and user-uploaded assets, and they must be stored away from the VPS. Test restoring to a clean staging machine at a scheduled interval. Record the software versions, environment variables, SMTP credentials location, DNS settings, and any extension list needed to rebuild the site.
Apply operating-system and forum security updates promptly, but stage major upgrades first. Read release notes for database migrations, runtime changes, and extension compatibility. Keep a rollback or restore path; a snapshot taken immediately before an upgrade is useful only if you know how to boot it and recover mail and DNS.
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Troubleshooting common VPS failures
The installer is killed or the server freezes
Check memory graphs and kernel logs for an out-of-memory event. Add temporary swap, stop unrelated services, and retry during a quiet period. If asset compilation or dependency installation repeatedly exhausts memory, move to a larger VPS rather than relying on swap indefinitely.
Pages are slow while CPU is low
Inspect disk I/O, swap activity, database locks, and PHP or Node worker limits. Low CPU does not rule out storage contention or too few application workers. Reduce oversized logs, rotate them, and verify that the database is on fast persistent storage.
Users do not receive activation or reset mail
Send a test message from the forum, inspect application and SMTP logs, and verify credentials, sender authorization, DNS records, and provider limits. Check spam and bounce reports before changing forum code. Do not open registration until password recovery works.
Updates break the forum
Restore the staging backup, identify the changed runtime, database migration, or extension, and follow the project’s supported upgrade order. Disable incompatible extensions only after confirming that doing so will not remove data. Keep the previous backup until users have exercised login, posting, search, uploads, and moderation.
Bottom line
Pick Discourse when maturity and integrated community features justify a Docker-based stack and a production VPS around 4 GB RAM. Pick Flarum for a clean PHP deployment when you can validate extensions and database performance. Pick NodeBB when its real-time Node.js model fits your team and you will track current runtime requirements. Consider MyBB or phpBB for a traditional forum, but verify their present server requirements yourself because no dependable figures were established here. Whichever you choose, prove the sizing on a trial VPS, configure SMTP, and rehearse backup restoration before launch.
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