To host multiple domains on one VPS with Virtualmin, install Virtualmin on a supported Linux server, give the server a fully qualified hostname, point each domain’s DNS records to the VPS, and create a Virtualmin virtual server for every independently managed site. Use a sub-server for a related domain under the same owner, or an alias when several domains must display the same website and use the same email addresses.
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Virtualmin keeps the domains on one machine while separating their web configurations, Unix ownership, DNS zones, mail settings, databases, SSL certificates, logs, and quotas. The number of domains your VPS can handle is determined by traffic, applications, mail volume, database work, storage, and memory—not by a fixed domain-count rule.
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How Virtualmin hosts several domains on one VPS
A VPS has one operating system, one network identity, and a finite pool of CPU, memory, storage, and bandwidth. Virtualmin layers account management on top of that host. Each virtual server gets its own domain configuration and can have a Unix account, home directory, website, DNS zone, mail services, SSL settings, databases, logs, and quota limits.
The web server uses the hostname requested by a browser to select the matching virtual-host configuration. That lets one IP address answer for many domains. The sites are not separate VPS instances, so they still share the host kernel and hardware, but Virtualmin gives each account a separate administrative boundary and file ownership.
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Choose the account type before you create anything
| Virtualmin type | Use it when | Ownership and isolation | What is shared |
|---|---|---|---|
| Top-level virtual server | The domain needs independent administration. | It receives its own virtual-server owner and Unix account. | It can have its own website, DNS, mail, SSL, databases, and quotas. |
| Sub-server | A related domain belongs under an existing owner. | It remains associated with the parent virtual-server owner and group. | The domain has its own identity, but administration and ownership follow the parent. |
| Alias | Several names should reach one site. | It is not a separate standalone site account. | It acts like the target domain, sharing the same website and email addresses. |
An alias is appropriate when example.net should be another name for example.com, not when it needs different files, users, mailboxes, or databases. Virtualmin describes an alias as allowing one domain to act exactly like another, including sharing the same website and email addresses.
Prepare the VPS before installing Virtualmin
Start with a clean, supported operating system
Use a fresh installation of a supported distribution such as Rocky Linux, Debian, or an Ubuntu Server LTS release. Virtualmin’s installation guidance expects reasonably modern components with current security patches. A clean server avoids conflicts with an existing control panel, web server, mail stack, firewall rules, or database installation.
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- Choose a VPS size based on the sites you will actually run, not merely on the number of domains.
- Reserve enough disk for website files, uploads, databases, mailboxes, temporary files, and logs.
- Decide whether IPv6 will be used. Add AAAA records only when the VPS has working IPv6 connectivity and the services are configured to listen on it.
- Keep a recovery or console path available in case a firewall, hostname, or network change prevents SSH access.
Set a dedicated fully qualified hostname
Give the machine a fully qualified hostname such as vps1.hosting.example. It should be different from every customer or project domain that you plan to host. A distinct hostname prevents confusion between the server identity and an individual virtual server and gives system services a stable name.
Set the hostname in the operating system before running the Virtualmin installer, and make sure local name resolution is consistent with it. If your provider supplies reverse DNS (PTR) configuration, use the same hostname there where possible; this is especially important for mail reputation.
Choose Apache or Nginx deliberately
Virtualmin supports Apache and Nginx. Choose the web server that matches your applications, deployment knowledge, and support requirements during installation. Do not install a second control panel or manually replace the selected web server afterward without following Virtualmin’s migration and configuration procedures.
Point every domain’s DNS to the VPS
DNS should be prepared before you provision sites and request certificates. For each domain, edit the authoritative DNS zone at the provider that controls it and direct the name to the VPS address.
| Record | Typical purpose | Important condition |
|---|---|---|
| A | Maps a name to the VPS IPv4 address. | Use the VPS’s current public IPv4 address. |
| AAAA | Maps a name to the VPS IPv6 address. | Add it only if IPv6 works end to end. |
| www | Provides the familiar web subdomain. | Point it to the same site, commonly with a CNAME or an additional address record. |
| MX | Directs mail for the domain. | Set it only when you intend to receive mail on this server, and point it to a mail hostname that also resolves correctly. |
Repeat the address records for every independent domain. DNS changes may be cached according to the zone’s TTL, so a newly changed record will not necessarily appear everywhere immediately.
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Check resolution before continuing
From a system with DNS tools installed, verify the public answers:
dig +short example.com A
dig +short example.com AAAA
dig +short www.example.com AReplace the names with each domain you plan to host. The results should show the intended VPS address. If an AAAA query returns an address but the VPS is not reachable over IPv6, visitors may fail intermittently even when IPv4 works; remove the unusable AAAA record or fix IPv6 before enabling production traffic.
Install Virtualmin and create the first domain
Follow the current Virtualmin installation procedure for the operating system you selected. The installer configures Webmin and the service components you choose. Installation options commonly include Apache or Nginx, DNS, mail, databases, SSL support, quotas, and logging. Select only services you will maintain, because every enabled service consumes resources and increases the security surface.
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Create a top-level virtual server
- Sign in to Virtualmin and open Create Virtual Server.
- Enter the complete domain name, such as
example.com. Do not enter a URL with a scheme or path. - Choose the administrative owner and set a strong password or the account’s authentication method.
- Enable the features this domain requires: Unix account and home directory, website, DNS zone, mail, SSL, databases, log rotation, and any plan-based limits.
- Review the generated username, home directory, IP settings, and resource limits before confirming creation.
- After provisioning, open the domain’s management page and record the document root, login details, DNS status, and enabled services.
A top-level server is the normal choice for a separately managed site. It prevents an administrator of one domain from accidentally treating another domain’s files, mail, or databases as part of the same account.
Add the next independent domain
- Return to Create Virtual Server rather than adding files inside the first domain’s directory.
- Enter the second domain and select its own owner, Unix account, DNS zone, mail options, SSL support, database options, and limits.
- Confirm that its A and, if applicable, AAAA records already point to the VPS.
- Create the server, then place the site’s files in the new account’s document root and test the domain by name.
Repeat this process for each domain that needs a separate site identity. Each account can use a different application, PHP configuration supported by your Virtualmin setup, database, mailbox set, and quota without sharing the other site’s Unix ownership.
When to use a sub-server or alias
Sub-server: a related domain under one owner
Create a sub-server when one person, team, or organization should administer several related domains from one parent account. It is useful for a project with a main domain and a separate campaign, regional, or product domain that needs its own domain identity but does not need a completely separate top-level owner.
In the parent virtual server’s management interface, choose the option to create a sub-server, enter the new domain, and review which services and limits it inherits. Check the resulting file paths and permissions before deploying an application. Because the sub-server remains tied to its parent owner and group, deleting or changing the parent can affect the child.
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Alias: another name for the same site
Create an alias when two or more domains should display identical content and use the same email addresses. An alias does not create an independent document root or separate mailbox set. The target site’s web configuration and mail identity are shared.
- Open the target virtual server.
- Choose the alias-domain option.
- Enter the additional domain name and confirm that its DNS points to the same VPS.
- Decide whether the alias should redirect visitors to the primary domain or remain an alternate hostname, based on your application’s canonical-URL and cookie behavior.
- Request or assign SSL coverage for the alias as well as the primary name.
Do not use an alias for a site that needs different branding, content, administrators, databases, or mailboxes. Make it a top-level server or sub-server instead.
Enable HTTPS for every domain
Virtualmin can request a Let’s Encrypt certificate during virtual-server creation or from the domain’s SSL controls. Certificate issuance depends on the domain resolving to the VPS and the web server being reachable for the validation method selected.
Request the certificate
- Open the virtual server’s management page.
- Go to the SSL certificate controls and select the option to obtain a certificate from Let’s Encrypt.
- Include the names visitors will use, such as the apex domain and
www, when those names resolve to this site. - Run the request and confirm that the certificate is installed in the web-server configuration.
- Repeat the process for each top-level server, sub-server, and alias that needs HTTPS coverage.
The Virtualmin API exposes an option to request a certificate while skipping connectivity checks when that is appropriate for a controlled setup. Skipping a check does not make an unreachable domain valid; it only changes when validation is performed. For a public site, correct DNS and reachability are the safer prerequisites.
Verify the result
- Open the HTTPS URL for the apex domain and every configured alternate hostname.
- Confirm that the certificate’s names include the hostname in the browser address bar.
- Check that HTTP-to-HTTPS behavior matches your application’s needs.
- Test renewal before the first certificate expires and investigate failed renewal notices immediately.
Deploy website files without breaking isolation
Each Virtualmin domain has a document root inside its account’s home area. Upload files as that domain’s Unix user or through a deployment method that preserves the account’s ownership. Avoid copying application files as root and leaving them unreadable to the web service.
Use the correct ownership and permissions
- Keep the document root owned by the domain’s Unix account unless the application specifically requires a controlled writable directory.
- Make upload, cache, and temporary directories writable only where required.
- Never make an entire home directory world-writable to solve a permissions error.
- Store secrets outside public document roots and restrict their read permissions.
- Review generated configuration files after changing a domain’s web-server or runtime settings.
Logs, website data, CGI scripts, and mail data are primarily stored under /home. Monitor that filesystem separately from database storage so a full log or mailbox partition does not unexpectedly take down unrelated sites.
Add databases and mail only where they are needed
Databases
Virtualmin can provision MySQL or MariaDB and PostgreSQL features for a virtual server. Enable the database engine and create a database only for applications that require it. For each site, record the database name, database user, host, port, and backup schedule in your deployment documentation.
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Give each application its own database credentials and the minimum privileges it needs. Do not reuse a global database administrator password across domains. Database files consume storage and memory independently of website files, so include them in capacity and backup planning.
Virtualmin supports mail components including Postfix and Dovecot. Enable mail for a domain only when you intend to operate mailboxes on the VPS. Set the domain’s MX record, create the required mailboxes, and test inbound and outbound delivery before announcing the address.
Mail requires more than a mailbox toggle. Check MX resolution, the server hostname, reverse DNS where available, authentication settings, mailbox quotas, spam controls, and backup retention. A domain that uses an external mail provider should keep its MX records there instead of enabling local delivery accidentally.
Set plans, quotas, and per-domain limits
Virtualmin plans let you apply repeatable defaults when creating accounts. Depending on the plan and edition, limits can cover aliases, sub-servers, mailboxes, databases, disk space, and related services. You can also set explicit limits for an individual virtual server.
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- Disk quota for website files, uploads, mail, and logs.
- Maximum number of mailboxes and mailbox storage.
- Maximum databases and database users.
- Allowed aliases and sub-servers.
- Traffic or other provider-specific resource controls.
Set a warning threshold below the hard limit so you have time to respond. A quota is not a substitute for monitoring: a site can remain below its disk quota while exhausting memory or CPU with a runaway process.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How many domains can one VPS handle?
There is no authoritative universal domain count. Official Virtualmin guidance describes configurable limits rather than promising a number of domains per VPS. A small static site may consume very little capacity, while a single busy application, database, or mail workload can dominate the server.
| Capacity factor | What to measure | Why it changes the domain count |
|---|---|---|
| CPU | Average and peak utilization, request bursts, scheduled jobs. | Dynamic applications and background workers compete for processor time. |
| Memory | Used memory, swap activity, database and mail caches. | Insufficient RAM causes slow responses or process termination even when storage is available. |
| Storage | Website files, uploads, databases, mailboxes, and logs. | Large media libraries and retained mail can fill the filesystem. |
| Disk performance | Latency and I/O wait during backups, database work, and log rotation. | Many domains can be technically online but unusably slow when storage is saturated. |
| Network | Bandwidth, transfer limits, and concurrent connections. | Traffic spikes affect every account sharing the VPS. |
| Operations | Backup duration, update windows, monitoring coverage, and administrator time. | More domains create more certificates, logs, mail queues, and failure points to maintain. |
Measure the workloads you have, set quotas, and leave headroom for bursts, updates, backups, and recovery. Move a demanding application to its own VPS when it repeatedly consumes shared resources or requires a different security and maintenance policy.
Test each domain after provisioning
Run these checks for every top-level server, sub-server, and alias before handing it to a user:
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- DNS: Query the A and applicable AAAA records and confirm they return the VPS addresses.
- Web routing: Request the domain by hostname over HTTP and verify that the correct document root responds rather than another site’s default page.
- HTTPS: Test the apex and alternate names, inspect certificate coverage, and verify the intended redirect behavior.
- Ownership: Create and remove a test file through the intended deployment method, then confirm its Unix owner and permissions.
- Application: Check configuration, uploads, scheduled jobs, and database connectivity using the domain’s own credentials.
- Mail: If enabled, confirm MX resolution, inbound delivery, authenticated outbound delivery, mailbox quotas, and the correct domain identity.
- Quotas: Verify that the account’s disk, mailbox, database, alias, and sub-server limits are applied.
- Backups: Confirm that website files, databases, mail, and Virtualmin configuration are included and that a restore path exists.
- Logs: Locate access and error logs for the domain and make sure rotation is working.
Troubleshoot common failures
| Symptom | Likely cause | What to check |
|---|---|---|
| The domain shows an old site or no site. | DNS still points elsewhere, a cached record is being used, or the domain was created as the wrong account type. | Query A and AAAA records, verify the Virtualmin domain name, and confirm the request reaches the expected VPS address. |
| HTTPS certificate issuance fails. | The name does not resolve to the VPS, an unusable AAAA record takes precedence, or the web service cannot be reached. | Fix DNS and IPv6, test the hostname publicly, then request the certificate again. |
| A correct URL returns 403 Forbidden. | File ownership, directory traversal permissions, or an application rule is wrong. | Inspect the document root owner, parent-directory permissions, web-server error log, and application access rules. |
| Files from one domain appear in another. | The site was uploaded to the wrong document root or domains were incorrectly configured as aliases. | Compare each virtual server’s document root and account type; move the files into the intended account. |
| Mail is not arriving. | MX records point elsewhere, local delivery is disabled, or the mailbox is over quota. | Query MX records, review the domain’s mail settings and queue, and check mailbox and disk quotas. |
| Several sites become slow together. | The VPS is out of CPU, memory, disk space, or I/O capacity. | Inspect resource graphs, process usage, database activity, logs, and free space; apply limits or resize the VPS. |
| A sub-server cannot be managed as an independent customer. | It was intentionally created under a parent owner. | Use a top-level virtual server if it needs separate administration and ownership. |
Secure and maintain the shared VPS
Patch the host and services
Keep the operating system, Virtualmin components, web server, runtime packages, databases, and mail services current. Apply updates during a planned window and test representative domains afterward. A vulnerable application in one account can threaten the shared host, so patching each site’s software matters as much as patching Virtualmin.
Reduce cross-account risk
- Use separate Unix users and database credentials for separate domains.
- Give administrators only the Virtualmin privileges they need.
- Disable unused mail, database, DNS, and scripting features.
- Keep secrets out of public directories and rotate credentials after staff changes.
- Review aliases and sub-servers periodically so abandoned names do not continue serving content.
Back up for restoration, not just compliance
Back up website files, databases, mailboxes, DNS and virtual-server configuration, and the host’s critical settings. Keep at least one copy outside the VPS. Test restoring a complete domain, including its database and SSL configuration, because a backup that cannot be restored is not a recovery plan.
Monitor growth and certificate health
Watch CPU, memory, disk space, disk I/O, network use, mail queues, database errors, HTTP status codes, and certificate expiration. Set alerts before quotas or storage reach 100 percent. Review logs after every major configuration change and after adding a new domain.
When to split domains across more than one VPS
One VPS is convenient when the domains have similar trust, maintenance, and performance requirements. Consider separate VPS instances when one project needs privileged software, a different operating-system lifecycle, strict tenant isolation, high availability, unusually heavy databases, or independent maintenance windows.
Keep related low-traffic sites together only when you can accept a shared failure domain: a kernel issue, exhausted disk, network outage, or misconfiguration can affect every account on that machine. Virtualmin’s account boundaries improve organization and administration, but they do not turn one VPS into physically independent servers.
Quick Recap
Practical provisioning checklist
- Fresh supported Rocky Linux, Debian, or Ubuntu Server LTS installation.
- Distinct fully qualified hostname configured before Virtualmin installation.
- Apache or Nginx selected intentionally.
- A and, when valid, AAAA records prepared for every domain.
- Top-level server chosen for independent ownership; sub-server for a child under one owner; alias for the same site and mail.
- Only required DNS, web, mail, database, SSL, and scripting services enabled.
- Let’s Encrypt certificate requested after DNS and reachability are correct.
- Document roots, Unix ownership, databases, mailboxes, quotas, and logs verified.
- Backups, restores, updates, monitoring, and renewal checks documented.
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