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# From 5.2 to 5.3
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## Warning
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GitLab 5.3 is affected by critical security vulnerabilities CVE-2013-4490 and CVE-2013-4489.
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## 0. Backup
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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):
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```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
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sudo service gitlab stop
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## 2. Get latest code
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```bash
cd /home/git/gitlab
sudo -u git -H git fetch
sudo -u git -H git checkout 5-3-stable
```
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## 3. Install libs, migrations, etc.
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```bash
cd /home/git/gitlab
# MySQL
sudo -u git -H bundle install --without development test postgres --deployment
#PostgreSQL
sudo -u git -H bundle install --without development test mysql --deployment
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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## 4. Update config files
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- Make `/home/git/gitlab/config/gitlab.yml` same as https://gitlab.com/gitlab-org/gitlab-ce/blob/5-3-stable/config/gitlab.yml.example but with your settings.
- Make `/home/git/gitlab/config/puma.rb` same as https://gitlab.com/gitlab-org/gitlab-ce/blob/5-3-stable/config/puma.rb.example but with your settings.
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## 5. Update Init script
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```bash
sudo rm /etc/init.d/gitlab
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sudo curl -L --output /etc/init.d/gitlab https://raw.github.com/gitlabhq/gitlabhq/5-3-stable/lib/support/init.d/gitlab
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sudo chmod +x /etc/init.d/gitlab
```
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## 6. Start application
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sudo service gitlab start
sudo service nginx restart
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## 7. 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 (5.2)
### 1. Revert the code to the previous version
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Follow the [`upgrade guide from 5.1 to 5.2` ](5.1-to-5.2.md ), except for the database migration (the backup is already migrated to the previous version).
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### 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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```