Refactor the upgrading from source docsdocs/refactor-update-guides

Instead of requiring one separate document for every version (which is
created by release managers), we now use a single document for both
Community Edition and Enterprise Edition. This allows developers to add
guidelines right away, instead of release managers having to determine
what to add.

Version specific upgrading instructions are placed in a separate
section. This prevents instructions from lingering around for many
versions should a developer forget to remove them. This also ensures
that all instructions are kept in a single place, instead of being
spread across different documents.

A minor downside is that CE and EE guidelines now live in the same
document, which could cause merge conflicts. Since we are working
towards a single codebase, this should only be an issue until we merge
the codebases together; something we expect to do in the coming months.

This commit also removes all old upgrading instructions, but these can
still be accessed using Git branch specific URLs (included in the
updating README).

1 files changed, 390 insertions, 0 deletions

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+comments: false
+---
+
+# Upgrading Community Edition and Enterprise Edition from source
+
+Make sure you view this update guide from the branch (version) of GitLab you
+would like to install (e.g., `11.8`. You can select the version in the version
+dropdown at the top left corner of GitLab (below the menu bar).
+
+In all examples, replace `BRANCH` with the branch for the version you uprading
+to (e.g. `11-8-stable` for `11.8`), and replace `PREVIOUS_BRANCH` with the
+branch for the version you are upgrading from (e.g. `11-7-stable` for `11.7`).
+
+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.
+
+## Guidelines for all versions
+
+This section contains all the steps necessary to upgrade Community Edition or
+Enterprise Edition, regardless of the version you are upgrading to. Version
+specific guidelines (should there be any) are covered separately.
+
+### 1. Stop server
+
+```bash
+sudo service gitlab stop
+```
+
+### 2. Backup
+
+NOTE: If you installed GitLab from source, make sure `rsync` is installed.
+
+```bash
+cd /home/git/gitlab
+
+sudo -u git -H bundle exec rake gitlab:backup:create RAILS_ENV=production
+```
+
+### 3. Update Ruby
+
+NOTE: Beginning in GitLab 11.0, we only support Ruby 2.4 or higher, and dropped
+support for Ruby 2.3. Be sure to upgrade if necessary.
+
+You can check which version you are running with `ruby -v`.
+
+Download Ruby and compile it:
+
+```bash
+mkdir /tmp/ruby && cd /tmp/ruby
+curl --remote-name --progress https://cache.ruby-lang.org/pub/ruby/2.5/ruby-2.5.3.tar.gz
+echo 'f919a9fbcdb7abecd887157b49833663c5c15fda  ruby-2.5.3.tar.gz' | shasum -c - && tar xzf ruby-2.5.3.tar.gz
+cd ruby-2.5.3
+
+./configure --disable-install-rdoc
+make
+sudo make install
+```
+
+Install Bundler:
+
+```bash
+sudo gem install bundler --no-document --version '< 2'
+```
+
+### 4. Update Node
+
+NOTE: Beginning in GitLab 11.8, we only support node 8 or higher, and dropped
+support for node 6. Be sure to upgrade if necessary.
+
+GitLab utilizes [webpack](http://webpack.js.org) to compile frontend assets.
+This requires a minimum version of node v8.10.0.
+
+You can check which version you are running with `node -v`. If you are running
+a version older than `v8.10.0` you will need to update to a newer version. You
+can find instructions to install from community maintained packages or compile
+from source at the nodejs.org website.
+
+<https://nodejs.org/en/download/>
+
+GitLab also requires the use of yarn `>= v1.10.0` to manage JavaScript
+dependencies.
+
+```bash
+curl --silent --show-error https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
+echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
+sudo apt-get update
+sudo apt-get install yarn
+```
+
+More information can be found on the [yarn website](https://yarnpkg.com/en/docs/install).
+
+### 5. Update Go
+
+NOTE: GitLab 11.4 and higher only supports Go 1.10.x and newer, and dropped support for Go
+1.9.x. Be sure to upgrade your installation if necessary.
+
+You can check which version you are running with `go version`.
+
+Download and install Go:
+
+```bash
+# Remove former Go installation folder
+sudo rm -rf /usr/local/go
+
+curl --remote-name --progress https://dl.google.com/go/go1.10.5.linux-amd64.tar.gz
+echo 'a035d9beda8341b645d3f45a1b620cf2d8fb0c5eb409be36b389c0fd384ecc3a  go1.10.5.linux-amd64.tar.gz' | shasum -a256 -c - && \
+  sudo tar -C /usr/local -xzf go1.10.5.linux-amd64.tar.gz
+sudo ln -sf /usr/local/go/bin/{go,godoc,gofmt} /usr/local/bin/
+rm go1.10.5.linux-amd64.tar.gz
+```
+
+### 6. Get latest code
+
+```bash
+cd /home/git/gitlab
+
+sudo -u git -H git fetch --all --prune
+sudo -u git -H git checkout -- db/schema.rb # local changes will be restored automatically
+sudo -u git -H git checkout -- locale
+```
+
+For GitLab Community Edition:
+
+```bash
+cd /home/git/gitlab
+
+sudo -u git -H git checkout BRANCH
+```
+
+OR
+
+For GitLab Enterprise Edition:
+
+```bash
+cd /home/git/gitlab
+
+sudo -u git -H git checkout BRANCH-ee
+```
+
+### 7. Update gitlab-shell
+
+```bash
+cd /home/git/gitlab-shell
+
+sudo -u git -H git fetch --all --tags --prune
+sudo -u git -H git checkout v$(</home/git/gitlab/GITLAB_SHELL_VERSION)
+sudo -u git -H bin/compile
+```
+
+### 8. Update gitlab-workhorse
+
+Install and compile gitlab-workhorse. GitLab-Workhorse uses
+[GNU Make](https://www.gnu.org/software/make/).
+If you are not using Linux you may have to run `gmake` instead of
+`make` below.
+
+```bash
+cd /home/git/gitlab-workhorse
+
+sudo -u git -H git fetch --all --tags --prune
+sudo -u git -H git checkout v$(</home/git/gitlab/GITLAB_WORKHORSE_VERSION)
+sudo -u git -H make
+```
+
+### 9. Update Gitaly
+
+#### Compile Gitaly
+
+```shell
+cd /home/git/gitaly
+sudo -u git -H git fetch --all --tags --prune
+sudo -u git -H git checkout v$(</home/git/gitlab/GITALY_SERVER_VERSION)
+sudo -u git -H make
+```
+
+### 10. Update gitlab-pages
+
+#### Only needed if you use GitLab Pages
+
+Install and compile gitlab-pages. GitLab-Pages uses
+[GNU Make](https://www.gnu.org/software/make/).
+If you are not using Linux you may have to run `gmake` instead of
+`make` below.
+
+```bash
+cd /home/git/gitlab-pages
+
+sudo -u git -H git fetch --all --tags --prune
+sudo -u git -H git checkout v$(</home/git/gitlab/GITLAB_PAGES_VERSION)
+sudo -u git -H make
+```
+
+### 11. Update MySQL permissions
+
+If you are using MySQL you need to grant the GitLab user the necessary
+permissions on the database:
+
+```bash
+mysql -u root -p -e "GRANT TRIGGER ON \`gitlabhq_production\`.* TO 'git'@'localhost';"
+```
+
+If you use MySQL with replication, or just have MySQL configured with binary logging,
+you will need to also run the following on all of your MySQL servers:
+
+```bash
+mysql -u root -p -e "SET GLOBAL log_bin_trust_function_creators = 1;"
+```
+
+You can make this setting permanent by adding it to your `my.cnf`:
+
+```
+log_bin_trust_function_creators=1
+```
+
+### 12. Update configuration files
+
+#### New configuration options for `gitlab.yml`
+
+There might be configuration options available for [`gitlab.yml`][yaml]. View
+them with the command below and apply them manually to your current
+`gitlab.yml`:
+
+```sh
+cd /home/git/gitlab
+
+git diff origin/PREVIOUS_BRANCH:config/gitlab.yml.example origin/BRANCH:config/gitlab.yml.example
+```
+
+#### Nginx configuration
+
+Ensure you're still up-to-date with the latest NGINX configuration changes:
+
+```sh
+cd /home/git/gitlab
+
+# For HTTPS configurations
+git diff origin/PREVIOUS_BRANCH:lib/support/nginx/gitlab-ssl origin/BRANCH:lib/support/nginx/gitlab-ssl
+
+# For HTTP configurations
+git diff origin/PREVIOUS_BRANCH:lib/support/nginx/gitlab origin/BRANCH:lib/support/nginx/gitlab
+```
+
+If you are using Strict-Transport-Security in your installation to continue
+using it you must enable it in your Nginx configuration as GitLab application no
+longer handles setting it.
+
+If you are using Apache instead of NGINX please see the updated [Apache templates].
+Also note that because Apache does not support upstreams behind Unix sockets you
+will need to let gitlab-workhorse listen on a TCP port. You can do this
+via [/etc/default/gitlab].
+
+#### SMTP configuration
+
+If you're installing from source and use SMTP to deliver mail, you will need to
+add the following line to `config/initializers/smtp_settings.rb`:
+
+```ruby
+ActionMailer::Base.delivery_method = :smtp
+```
+
+See [smtp_settings.rb.sample] as an example.
+
+#### Init script
+
+There might be new configuration options available for
+[`gitlab.default.example`][gl-example]. View them with the command below and
+apply them manually to your current `/etc/default/gitlab`:
+
+```sh
+cd /home/git/gitlab
+
+git diff origin/PREVIOUS_BRANCH:lib/support/init.d/gitlab.default.example origin/BRANCH:lib/support/init.d/gitlab.default.example
+```
+
+Ensure you're still up-to-date with the latest init script changes:
+
+```bash
+cd /home/git/gitlab
+
+sudo cp lib/support/init.d/gitlab /etc/init.d/gitlab
+```
+
+For Ubuntu 16.04.1 LTS:
+
+```bash
+sudo systemctl daemon-reload
+```
+
+### 13. Install libs, migrations, etc.
+
+```bash
+cd /home/git/gitlab
+
+# PostgreSQL installations (note: the line below states '--without mysql')
+sudo -u git -H bundle install --deployment --without development test mysql aws kerberos
+
+# MySQL installations (note: the line below states '--without postgres')
+sudo -u git -H bundle install --deployment --without development test postgres aws kerberos
+
+
+# Optional: clean up old gems
+sudo -u git -H bundle clean
+
+# Run database migrations
+sudo -u git -H bundle exec rake db:migrate RAILS_ENV=production
+
+# Compile GetText PO files
+
+sudo -u git -H bundle exec rake gettext:compile RAILS_ENV=production
+
+# Update node dependencies and recompile assets
+sudo -u git -H bundle exec rake yarn:install gitlab:assets:clean gitlab:assets:compile RAILS_ENV=production NODE_ENV=production
+
+# Clean up cache
+sudo -u git -H bundle exec rake cache:clear RAILS_ENV=production
+```
+
+**MySQL installations**: Run through the `MySQL strings limits` and `Tables and
+data conversion to utf8mb4` [tasks](../install/database_mysql.md).
+
+### 14. Start application
+
+```bash
+sudo service gitlab start
+sudo service nginx restart
+```
+
+### 15. Check application status
+
+Check if GitLab and its environment are configured correctly:
+
+```bash
+cd /home/git/gitlab
+
+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:
+
+```bash
+cd /home/git/gitlab
+
+sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production
+```
+
+If all items are green, then congratulations, the upgrade is complete!
+
+## Version specific upgrading instructions
+
+This section contains upgrading instructions for specific versions. When
+present, first follow the upgrading guidelines for all versions. If the version
+you are upgrading to is not listed here, then no additional steps are required.
+
+<!--
+Example:
+
+### 11.8.0
+
+Additional instructions here.
+-->
+
+## Things went south? Revert to previous version
+
+### 1. Revert the code to the previous version
+
+To revert to a previous version, you'll need to following the upgrading guides
+for the previous version. If you upgraded to 11.8 and want to revert back to
+11.7, you'll need to follow the guides for upgrading from 11.6 to 11.7. You can
+use the version dropdown at the top of the page to select the right version.
+
+When reverting, you should _not_ follow the database migration guides, as 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.
+
+[yaml]: https://gitlab.com/gitlab-org/gitlab-ce/blob/master/config/gitlab.yml.example
+[gl-example]: https://gitlab.com/gitlab-org/gitlab-ce/blob/master/lib/support/init.d/gitlab.default.example
+[smtp_settings.rb.sample]: https://gitlab.com/gitlab-org/gitlab-ce/blob/master/config/initializers/smtp_settings.rb.sample#L13
+[Apache templates]: https://gitlab.com/gitlab-org/gitlab-recipes/tree/master/web-server/apache
+[/etc/default/gitlab]: https://gitlab.com/gitlab-org/gitlab-ce/blob/master/lib/support/init.d/gitlab.default.example#L38