Merge branch 'rs-8-1-update-guide-changes' into '8-1-stable'

Update 8.0-to-8.1 update guide

- User needs to update gitlab-git-http-server
- User needs to update Nginx configuration

[ci skip]

See merge request !1625

doc/update/8.0-to-8.1.md

@@ -70,7 +70,16 @@ sudo -u git -H git fetch
 sudo -u git -H git checkout v2.6.5
 ```
 
-### 5. Install libs, migrations, etc.
+### 5. Update gitlab-git-http-server
+
+```bash
+cd /home/git/gitlab-git-http-server
+sudo -u git -H git fetch origin
+sudo -u git -H git checkout 0.3.0
+sudo -u git -H make
+```
+
+### 6. Install libs, migrations, etc.
 
 ```bash
 cd /home/git/gitlab
@@ -91,7 +100,7 @@ sudo -u git -H bundle exec rake assets:clean assets:precompile cache:clear RAILS
 sudo cp lib/support/init.d/gitlab /etc/init.d/gitlab
 ```
 
-### 6. Update configuration files
+### 7. Update configuration files
 
 #### New configuration options for `gitlab.yml`
 
@@ -101,12 +110,33 @@ There are new configuration options available for [`gitlab.yml`](config/gitlab.y
 git diff origin/8-0-stable:config/gitlab.yml.example origin/8-1-stable:config/gitlab.yml.example
 ```
 
-### 7. Start application
+#### Nginx configuration
+
+View changes between the previous recommended Nginx configuration and the
+current one:
+
+```sh
+# For HTTPS configurations
+git diff origin/8-0-stable:lib/support/nginx/gitlab-ssl origin/8-1-stable:lib/support/nginx/gitlab-ssl
+
+# For HTTP configurations
+git diff origin/8-0-stable:lib/support/nginx/gitlab origin/8-1-stable:lib/support/nginx/gitlab
+```
+
+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-git-http-server listen on a TCP port. You can do this
+via [/etc/default/gitlab].
+
+[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/8-1-stable/lib/support/init.d/gitlab.default.example#L34
+
+### 8. Start application
 
     sudo service gitlab start
     sudo service nginx restart
 
-### 8. Check application status
+### 9. Check application status
 
 Check if GitLab and its environment are configured correctly: