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# From 5.1 to 5.2
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## Warning
GitLab 5.2 is affected by critical security vulnerabilities CVE-2013-4490 and CVE-2013-4489. Please update to GitLab 5.4 immediately.
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### 0. Backup
It's useful to make a backup just in case things go south:
(With MySQL, this may require granting "LOCK TABLES" privileges to the GitLab user on the database version)
```bash
cd /home/git/gitlab
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sudo -u git -H bundle exec rake gitlab:backup:create RAILS_ENV=production
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```
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### 1. Stop server
sudo service gitlab stop
### 2. Get latest code
```bash
cd /home/git/gitlab
sudo -u git -H git fetch
sudo -u git -H git checkout 5-2-stable
```
### 3. Update gitlab-shell
```bash
cd /home/git/gitlab-shell
sudo -u git -H git fetch
sudo -u git -H git checkout v1.4.0
```
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### 4. Install libs, migrations, etc.
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```bash
cd /home/git/gitlab
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# MySQL
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sudo -u git -H bundle install --without development test postgres --deployment
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#PostgreSQL
sudo -u git -H bundle install --without development test mysql --deployment
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sudo -u git -H bundle exec rake db:migrate RAILS_ENV=production
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sudo -u git -H bundle exec rake assets:precompile RAILS_ENV=production
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```
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### 5. Update config files
* Make `/home/git/gitlab/config/gitlab.yml` same as https://github.com/gitlabhq/gitlabhq/blob/5-2-stable/config/gitlab.yml.example but with your settings.
* Make `/home/git/gitlab/config/puma.rb` same as https://github.com/gitlabhq/gitlabhq/blob/5-2-stable/config/puma.rb.example but with your settings.
### 6. Update Init script
```bash
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cd /home/git/gitlab
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sudo rm /etc/init.d/gitlab
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sudo cp lib/support/init.d/gitlab /etc/init.d/gitlab
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sudo chmod +x /etc/init.d/gitlab
```
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### 7. Create uploads directory
```bash
cd /home/git/gitlab
sudo -u git -H mkdir public/uploads
sudo chmod -R u+rwX public/uploads
```
### 8. Start application
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sudo service gitlab start
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sudo service nginx restart
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### 9. Check application status
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Check if GitLab and its environment are configured correctly:
sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production
To make sure you didn't miss anything run a more thorough check with:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production
If all items are green, then congratulations upgrade complete!
## Things went south? Revert to previous version (5.1)
### 1. Revert the code to the previous version
Follow the [`upgrade guide from 5.0 to 5.1` ](5.0-to-5.1.md ), except for the database migration
(The backup is already migrated to the previous version)
### 2. Restore from the backup:
```bash
cd /home/git/gitlab
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sudo -u git -H bundle exec rake gitlab:backup:restore RAILS_ENV=production
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```