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# From 8.3 to 8.4
Make sure you view this update guide from the tag (version) of GitLab you would
like to install. In most cases this should be the highest numbered production
tag (without rc in it). You can select the tag in the version dropdown at the
top left corner of GitLab (below the menu bar).
If the highest number stable branch is unclear please check the
[GitLab Blog](https://about.gitlab.com/blog/archives.html) for installation
guide links by version.
### 1. Stop server
sudo service gitlab stop
### 2. Backup
```bash
cd /home/git/gitlab
sudo -u git -H bundle exec rake gitlab:backup:create RAILS_ENV=production
```
### 3. Get latest code
```bash
sudo -u git -H git fetch --all
sudo -u git -H git checkout -- db/schema.rb # local changes will be restored automatically
```
For GitLab Community Edition:
```bash
sudo -u git -H git checkout 8-4-stable
```
OR
For GitLab Enterprise Edition:
```bash
sudo -u git -H git checkout 8-4-stable-ee
```
### 4. Update gitlab-shell
```bash
cd /home/git/gitlab-shell
sudo -u git -H git fetch --all
sudo -u git -H git checkout v2.6.10
```
### 5. Update gitlab-workhorse
Install and compile gitlab-workhorse. This requires [Go 1.5](https://golang.org/dl)
which should already be on your system from GitLab 8.1.
```bash
cd /home/git/gitlab-workhorse
sudo -u git -H git fetch --all
sudo -u git -H git checkout 0.6.2
sudo -u git -H make
```
### 6. Install libs, migrations, etc.
```bash
cd /home/git/gitlab
# MySQL installations (note: the line below states '--without postgres')
sudo -u git -H bundle install --without postgres development test --deployment
# PostgreSQL installations (note: the line below states '--without mysql')
sudo -u git -H bundle install --without mysql development test --deployment
# Run database migrations
sudo -u git -H bundle exec rake db:migrate RAILS_ENV=production
# Clean up assets and cache
sudo -u git -H bundle exec rake assets:clean assets:precompile cache:clear RAILS_ENV=production
```
### 7. Update configuration files
#### New configuration options for `gitlab.yml`
There are new configuration options available for [`gitlab.yml`](config/gitlab.yml.example). View them with the command below and apply them manually to your current `gitlab.yml`:
```sh
git diff origin/8-3-stable:config/gitlab.yml.example origin/8-4-stable:config/gitlab.yml.example
```
#### Init script
We updated the init script for GitLab in order to set a specific PATH for gitlab-workhorse.
```
cd /home/git/gitlab
sudo cp lib/support/init.d/gitlab /etc/init.d/gitlab
```
### 8. Start application
sudo service gitlab start
sudo service nginx restart
### 9. Check application status
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:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production
If all items are green, then congratulations, the upgrade is complete!
## Things went south? Revert to previous version (8.3)
### 1. Revert the code to the previous version
Follow the [upgrade guide from 8.2 to 8.3](8.2-to-8.3.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
sudo -u git -H bundle exec rake gitlab:backup:restore RAILS_ENV=production
```
If you have more than one backup `*.tar` file(s) please add `BACKUP=timestamp_of_backup` to the command above.
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