GitHub to GitLab Migration
Migrating a repository from GitHub to GitLab is a common task when switching platforms, consolidating projects, or moving to a self-hosted environment. Git makes this process flexible by allowing you to copy repositories along with their full history, branches, and tags.
In this guide, we will cover multiple methods to migrate a repository safely and efficiently, ensuring no data loss during the process.
When you need to migrate a repository
You may need to migrate a Git repository in the following scenarios:
- Moving from GitHub to GitLab for better DevOps integration
- Migrating to a self-hosted GitLab instance for security or compliance
- Consolidating repositories across platforms
- Switching to GitLab CI/CD pipelines
- Transferring ownership of a project
What is preserved during migration (commits, branches, tags)
When done correctly, Git migration preserves all important repository data:
- Commit history: All previous commits with author and timestamps
- Branches: All local and remote branches
- Tags: Release tags and version references
- File structure: Complete directory and file hierarchy
This ensures that the migrated repository behaves exactly like the original one.
Prerequisites
Before starting the migration, make sure the following requirements are met:
Git installed and configured
Ensure Git is installed and configured with your username and email:
git --version
git config --global user.name
git config --global user.emailAccess to GitHub repository
- You must have access to the source GitHub repository
- Ensure you can clone the repository using SSH or HTTPS
GitLab account with SSH configured
- Create a GitLab account
- Generate and add SSH keys
- Verify SSH access:
ssh -T git@gitlab.comBest Ways to Migrate a Git Repository
There are multiple ways to migrate a Git repository depending on your requirements.
Standard migration (manual push method)
This method involves:
- Cloning the repository
- Removing the old remote
- Adding a new GitLab remote
- Pushing branches and tags manually
Best for:
- Small repositories
- Learning Git migration steps
- Controlled migration process
Mirror migration (recommended method)
This is the most efficient and recommended method.
It uses:
git clone --mirror
git push --mirrorAdvantages:
- Copies all branches automatically
- Includes all tags and references
- Preserves complete history
- Faster and more reliable
Best for:
- Large repositories
- Production migration
- Full backup scenarios
GitLab import tool (UI-based method)
GitLab provides a built-in import feature:
- Import directly from GitHub
- Requires GitHub access token
- No manual Git commands required
Best for:
- Beginners
- Quick migrations
- Non-CLI users
Each method has its use case, but mirror migration is generally the safest and most complete approach.
Method 1: Standard Migration (Step-by-Step)
This method manually migrates your repository by updating the remote and pushing data to GitLab. It gives you more control but requires multiple steps.
Clone the GitHub repository
Clone your existing repository from GitHub:
git clone https://github.com/username/repository.git
cd repositoryVerify branches and tags
Check all available branches and tags before migration:
git branch -a
git tagThis ensures everything is available locally before pushing to GitLab.
Remove existing remote
Remove the current GitHub remote:
git remote -v
git remote rm originAdd GitLab as new remote
Create a new empty repository in GitLab and add it as a remote:
git remote add origin git@gitlab.com:username/repository.gitPush branches to GitLab
Push all branches to the new GitLab repository:
git push origin --allPush tags to GitLab
Push all tags to preserve version history:
git push origin --tagsMethod 2: Mirror Migration (Recommended)
Mirror migration is the fastest and most reliable way to migrate a repository while preserving everything automatically.
Clone repository as mirror
Clone the repository with all references:
git clone --mirror https://github.com/username/repository.git
cd repository.gitPush mirror to GitLab
Push everything (branches, tags, refs) to GitLab:
git push --mirror git@gitlab.com:username/repository.gitVerify all branches and tags
After migration, verify the repository:
git branch -a
git tagAlso check the GitLab UI to confirm that all branches and tags are present.
Standard vs Mirror Migration
Key differences explained
| Feature | Standard Migration | Mirror Migration |
|---|---|---|
| Branches | Manual push | Automatic |
| Tags | Manual push | Automatic |
| Commit history | Preserved | Preserved |
| Complexity | Medium | Simple |
| Speed | Slower | Faster |
| Recommended | ❌ | ✅ |
Which method should you choose
- Use standard migration if you want more control over what gets pushed
- Use mirror migration if you want a complete and accurate copy of the repository
- For most real-world scenarios, mirror migration is the preferred approach because it ensures nothing is missed
If your goal is a full migration with minimal effort and zero data loss, always choose the mirror method.
Verify Migration Success
After completing the migration, it is important to verify that all data has been transferred correctly to GitLab.
Check commit history
Verify that the full commit history is preserved:
git log --onelineCompare the commit history with your GitHub repository to ensure all commits are present.
Verify branches and tags
Check that all branches and tags are available:
git branch -a
git tagMake sure both local and remote branches are listed and match the original repository.
Compare GitHub and GitLab repositories
- Open both repositories in the browser
- Compare file structure and directories
- Verify latest commits and timestamps
- Ensure branches and tags are identical
Common Migration Issues
Permission denied (SSH error)
If you see an error like:
Permission denied (publickey)Solution:
- Ensure SSH key is added to GitLab
- Verify SSH connection:
ssh -T git@gitlab.comAuthentication issues (HTTPS vs SSH)
If authentication fails:
- Use SSH instead of HTTPS
- Or configure a Personal Access Token (PAT) for HTTPS
Missing branches or tags
If some branches or tags are missing:
- Ensure you used:
git push origin --all
git push origin --tags- For mirror migration:
git push --mirrorRemote already exists error
If you get:
remote origin already existsSolution:
git remote rm origin
git remote add origin <new-url>Frequently Asked Questions
1. How do I migrate a Git repository from GitHub to GitLab?
You can migrate by cloning the repository, removing the old remote, adding GitLab as a new remote, and pushing all branches and tags.2. Does git migration preserve history?
Yes, using git push --all and git push --tags ensures full commit history, branches, and tags are preserved.3. What is git mirror migration?
Git mirror migration copies all references including branches, tags, and history using git clone --mirror and git push --mirror.4. Can I migrate private repositories?
Yes, private repositories can be migrated using SSH or personal access tokens for authentication.5. What is the easiest way to migrate GitHub to GitLab?
The easiest way is using git mirror commands or GitLab import feature for automated migration.Summary
In this guide, you learned how to migrate a Git repository from GitHub to GitLab using different methods.
- Standard migration gives you manual control over branches and tags
- Mirror migration provides a complete and faster migration
- GitLab import tool offers a UI-based approach
You also learned how to verify migration success and troubleshoot common issues.
For most use cases, mirror migration is the recommended approach because it ensures full data transfer with minimal effort.
