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Before choosing, make a restorable backup, export application data and configuration, confirm that your provider offers the target image, and make sure you can use a web console or rescue environment if SSH stops working.
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The phrase “change the OS” can mean a destructive replacement, a major-version upgrade, or a migration to another machine. These are operationally different tasks. Select the method based on whether the current server must remain intact and how much testing you need before the change.
| Method | What happens | Best for | Main risk |
|---|---|---|---|
| Provider-panel reinstall | The provider formats the system disk and provisions a selected image. The existing operating-system files, packages, users and application data on that disk are removed. | A disposable server, a clean rebuild, or a fully backed-up workload. | Data loss if anything was not copied and no restore is available. |
| In-place release upgrade | The same VPS keeps its disks, network identity and installed services while packages and distribution files are changed to a newer supported release. | A supported Ubuntu, Debian, AlmaLinux, Rocky Linux or CentOS Stream upgrade where preserving the machine matters. | Dependency conflicts, failed boots, and incompatibility with control panels or kernel modules. |
| Side-by-side migration | A second VPS is built with the target OS. Data and services are copied, tested, and then traffic is redirected. | Production systems that need a testable cutover and an easy rollback path. | More setup work and temporary charges for two servers. |
OVHcloud describes the in-place approach as “the fastest and most economical method,” while calling side-by-side migration ideal for testing a new environment in parallel without affecting production. Those descriptions are useful decision rules, but the exact controls, images and recovery options depend on your provider.
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Prepare before changing anything
Make a backup you can actually restore
Create a provider snapshot and an independent backup before touching the operating system. A snapshot can capture application data, files, configurations, the kernel, packages and dependencies, but it is not automatically a complete system backup. Test that you can download or restore the files you need from off-server storage.
- Export every database to a separate location. Use
mysqldumpfor MySQL-compatible databases andpg_dumpfor PostgreSQL, then verify that the dump can be read. - Copy application directories such as
/var/www, user data under/home, uploads, queues and any other non-reproducible files. - Save TLS certificates and renewal configuration, environment files, deployment keys, systemd unit files, cron jobs, firewall rules and reverse-proxy configuration.
- Record installed packages and enabled services. On Debian-family systems, package inventories and files under
/etcare particularly useful when rebuilding. - Keep credentials and encryption keys in a secure location separate from the VPS. A backup that lives only on the disk being erased is not a backup.
Check application and image compatibility
Read the documentation for your application, database, runtime, kernel modules and management panel before selecting a release. Providers expose different image catalogs by plan and region; an image listed for one VPS may not be available for another. Windows Server images may require a specific plan or license. Confirm that your target release supports required CPU features, storage drivers, control-panel versions and third-party repositories.
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Make sure you can open the provider’s web console or rescue mode. It is your fallback if the new system does not start SSH. Record the current IPv4 and IPv6 addresses, DNS time-to-live values, reverse-DNS/PTR settings, additional IP assignments, private-network settings and any provider-specific firewall or routing rules.
Lower DNS TTL before a planned migration if your DNS provider allows it, but do not assume a low TTL makes propagation instantaneous. Keep the old server online until the new one has served real requests successfully.
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Reinstall the OS from a VPS control panel
A panel reinstall is the normal way to replace Ubuntu with Debian, change to another Linux family, or move between Linux and a provider-supported Windows image. It is destructive. OVHcloud’s VPS guidance states: “A reinstallation will delete all data currently hosted on the VPS (except for additional disks).” Treat that as the rule unless your own provider explicitly documents different behavior.
- Sign in to the provider’s VPS management panel and open the specific server.
- Find the action labelled Reinstall, Rebuild or OS template. Do not confuse it with a routine reboot or a rescue-mode boot.
- Review the offered distributions and releases. Select only an image supported for that VPS plan and location. Typical catalogs may include Ubuntu, Debian, AlmaLinux, Rocky Linux, CentOS Stream, Fedora, openSUSE, Alpine, Arch or Windows Server, but the actual list changes by provider.
- Choose the initial authentication method. Preinstall an SSH public key where possible; otherwise set a new root password or Windows Administrator password. Do not reuse a password from the old installation.
- Read the destructive confirmation, including any statement about additional disks, snapshots, IP addresses and licensing. Submit the reinstall only after confirming that your backups are restorable.
- Wait for provisioning to finish. Provider documentation commonly describes this as taking a few minutes, but the duration varies with image, storage and platform load.
- Retrieve the one-time credentials or key instructions shown by the panel. Some providers display a temporary password only once.
- Reconnect using the new system’s address. Because the SSH host key normally changes, remove the old fingerprint from your workstation with
ssh-keygen -R YOUR_VPS_IP, then accept the new fingerprint only after checking it in the provider console. - Apply security updates, create a non-root administrator with sudo rights, install and enable a firewall, and restore services and data. Test every public endpoint before declaring the rebuild complete.
What to do immediately after the first login
Do not expose an unpatched image while rebuilding. Update package metadata and installed packages using the target distribution’s documented procedure, set the correct time zone and hostname, and create a least-privilege administrative account. Restrict SSH to the keys and source networks you need, disable password authentication after confirming key login, and enable only required ports. Recreate monitoring and backups before restoring public traffic.
Upgrade the existing distribution in place
Use an in-place upgrade only when the distribution vendor supports the exact source-to-target path and all installed software is compatible. Take a snapshot and a separate backup first. An interrupted upgrade can leave a machine that boots into an emergency shell or has a mixture of old and new packages.
Ubuntu and Debian workflow
The safe sequence is to bring the current release fully up to date, remove obsolete packages after reviewing the proposed changes, reboot when a new kernel was installed, and then start the major-version procedure.
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- Log in through a tested SSH session or console and start a persistent terminal session such as
tmux. - Refresh package metadata:
sudo apt update. - Install normal updates:
sudo apt upgrade. - Complete dependency changes:
sudo apt full-upgrade. Read the removal and replacement list rather than accepting it blindly. - Remove no-longer-needed packages only after checking that they are not required by your application.
- Reboot if the kernel or core libraries changed, then verify that services and remote access return.
- For Ubuntu, run the supported release tool, typically
sudo do-release-upgrade, and follow its prompts. Do not launch it from an unstable network connection without a console fallback. - For Debian, change repositories according to the Debian release-upgrade instructions, update package metadata, perform the staged upgrade, and resolve configuration prompts deliberately. Do not copy a repository recipe intended for a different release.
- Reboot into the new system and verify the result with
cat /etc/os-release. Check kernel version, enabled services, storage mounts, firewall policy and application health.
Third-party repositories, pinned packages, custom kernels and locally compiled modules are common causes of failed upgrades. Disable or replace repositories that do not publish packages for the target release, and keep a record of every configuration choice so you can reproduce the result.
AlmaLinux, Rocky Linux and CentOS Stream
Use the supported ELevate or Leapp workflow for the specific source and target releases. Run every pre-check, fix its reported blockers, and review the transaction before proceeding. Do not treat a generic package “dist-upgrade” command as an equivalent. Kernel modules, bootloader configuration and repository availability must match the documented path.
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Control panels require their own migration path
Generic distribution-upgrade commands can corrupt hosting panels. OVHcloud specifically warns that generic dist-upgrade or Leapp procedures may damage Plesk or cPanel installations. Use the panel vendor’s supported migration utility, such as a documented CentOS-to-AlmaLinux tool or cPanel’s Elevate workflow, and retain a full backup. If the panel vendor does not support the desired source-to-target path, build a new VPS and migrate instead of forcing an in-place conversion.
Migrate side by side to a second VPS
This method separates preparation from cutover. The original server continues serving users while the target is built and tested. It is usually the safest choice for a business-critical website, mail system or database when a short, reversible cutover is more important than minimizing setup work.
- Order a second VPS with the target OS, compatible CPU and storage, and enough capacity to run the workload during testing.
- Recreate users, groups, SSH keys, firewall policy, web and database packages, language runtimes, scheduled jobs and monitoring. Do not copy unknown system files wholesale from the old OS.
- Transfer application files with
rsync. Preserve ownership, permissions, symbolic links and timestamps, for example with archive and numeric-ID options suited to your user layout. - Dump databases on the source with
mysqldumporpg_dump, transfer the dump over an encrypted channel, and import it into the target. For a large or busy database, plan a final synchronized dump or replication step so writes are not lost. - Install certificates and environment files from your secured backup. Recreate secrets with the target system’s permissions rather than leaving them world-readable.
- Test using a temporary hostname, a staging domain or a local hosts-file override. Exercise login, file uploads, background jobs, payment callbacks, email delivery, API integrations and database writes.
- Schedule the cutover. Freeze application writes or place the service in maintenance mode, run a final data synchronization, and verify that the target is current.
- Move an additional IP if your provider supports assigning it to the new VPS. Otherwise update the relevant A and AAAA records and any reverse-DNS settings.
- Monitor access logs, error logs, resource use and external checks throughout DNS propagation. Keep the old VPS powered on and unchanged until the new server is stable.
- Only after validation and the applicable DNS TTL period should you cancel the old server. Take one final backup first.
What survives a change and what does not
| Item | Panel reinstall | In-place upgrade | Side-by-side migration |
|---|---|---|---|
| System disk contents | Destroyed and recreated. | Retained, but files and packages are modified. | Old disk remains; selected data is copied to the new disk. |
| Primary service IP | May remain assigned, but verify in the provider panel. | Normally remains with the VPS. | New VPS normally has a different address unless an additional IP is moved. |
| Plan and location | Often unchanged; provider-specific. | Unchanged. | Chosen independently for the new VPS. |
| Reverse DNS/PTR | Can remain or require reconfiguration; check the provider. | Usually remains, subject to provider networking. | Must be configured for the new address if the IP changes. |
| SSH host key | Changes with the new installation. | Usually remains unless SSH is reconfigured. | Different on the new machine. |
| Users, passwords and firewall rules | Must be recreated. | Existing settings are carried forward but need verification. | Must be deliberately recreated or migrated. |
| Additional disks | May be excluded from the wipe; follow the provider’s warning. | Remain attached unless separately changed. | Need to be attached or copied to the new VPS. |
| Licenses | May need reactivation, especially for proprietary software or Windows. | Usually retained, but confirm compatibility. | May require a second license during overlap. |
Statements about unchanged IP addresses, locations and reverse DNS are not universal guarantees. Treat the control panel’s confirmation screen and provider documentation for your exact service as authoritative.
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Databases
Stop or quiesce writes before the final export. Import into a database version supported by the application, then check character sets, collations, extensions, roles and permissions. Test a real application transaction, not just whether the database process starts. Keep the original dump until the new system has passed validation.
Files and ownership
Copy files with metadata preservation, but audit numeric user and group IDs on the target. A matching username can have a different numeric ID, causing uploads or private keys to become inaccessible. Check setuid files, symlinks that point outside the copied tree, mounted volumes and generated caches that should be rebuilt rather than copied.
TLS, secrets and scheduled work
Restore certificates, private keys and renewal jobs with restrictive permissions. Recreate environment variables and secret-store integrations, then run a renewal dry run where supported. Copy cron and systemd timers only after reviewing paths, service users and working directories; a job that was safe on the old OS can fail or run with excessive privileges on the new one.
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Validate the server before declaring success
- Log in with the intended non-root account and confirm sudo access.
- Verify
/etc/os-release, kernel version, hostname, time synchronization and mounted storage. - Confirm that SSH keys, the firewall, fail2ban or equivalent controls, and provider-level network rules behave as expected.
- Check web, API, database, queue, worker, mail and monitoring services individually.
- Test IPv4 and IPv6, TLS certificate chains, redirects, large uploads, scheduled jobs and outbound email.
- Review system and application logs for permission errors, missing libraries, failed migrations and repeated restarts.
- Run a backup from the new system and verify that its output is readable from off-server storage.
- Measure resource use under representative traffic before removing the old environment.
Recover from predictable problems
SSH reports a host-key mismatch
A reinstall or new VPS legitimately has a new host key. Confirm the server identity through the provider console, remove the old local entry with ssh-keygen -R YOUR_VPS_IP, and reconnect. Do not bypass the warning by accepting an unverified key.
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Open the provider’s web console or rescue mode, inspect the bootloader and kernel selection, and review package-manager logs. Restore the snapshot only when you understand what data it contains and what writes occurred after it was created. If the distribution’s supported rollback path is unclear, build a clean target VPS and restore application data from the independent backup.
Packages or a control panel are broken
Stop adding repositories and commands at random. Capture package-manager errors, identify the unsupported component, and use the panel vendor’s recovery or migration procedure. A clean side-by-side rebuild is often safer than trying to repair a mixed-release installation.
Users see the old site after cutover
Check A and AAAA records, authoritative nameservers, local resolver caches, and any CDN or reverse proxy. Keep the old VPS serving a clear maintenance or redirect response only after the new endpoint is confirmed; shutting it down immediately can turn a DNS-cache delay into an outage.
Practical decision rules
- Choose a panel reinstall when the server can be rebuilt from documented steps and verified backups, and you want a genuinely clean OS.
- Choose an in-place upgrade when the vendor supports the exact path, preserving the existing machine is valuable, and you have console access plus a tested rollback plan.
- Choose side by side when production risk, testing, or rollback matters more than minimizing the number of VPS instances during the transition.
There is no universal success rate, downtime average or price for an OS change. Duration and cost depend on image provisioning, data volume, database size, DNS behavior, provider capacity and the amount of validation your application requires.
Security tasks after the OS change
Changing the image is not the same as securing the server. Rotate any credentials that may have been present on the old system, replace temporary passwords, review authorized SSH keys, and remove accounts that are no longer needed. Apply security updates, enable automatic security updates where appropriate, restrict management ports, and confirm that backups are encrypted and retained independently. Recheck licenses and telemetry settings for every restored component, then document the final OS release, kernel, IP addresses, recovery access and backup location.
Final recommendation
For a simple, disposable VPS, a provider-panel reinstall is the shortest route to another supported OS—but only after a verified backup because the system disk is wiped. For a supported major-version change on a carefully managed machine, an in-place upgrade can preserve the environment while demanding strict compatibility checks. For important production workloads, build the target VPS beside the old one, test it with real application flows, and move traffic only after a final synchronization. Whichever route you choose, plan for new credentials, changed SSH fingerprints, recreated security controls and explicit application validation.
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