update migration docs for 8.17 to include minimum node version and yarn installation

doc/update/8.16-to-8.17.md

@@ -49,7 +49,31 @@ Install Bundler:
 sudo gem install bundler --no-ri --no-rdoc
 ```
 
-### 4. Get latest code
+### 4. Update Node and Install Yarn
+
+GitLab now runs [webpack](http://webpack.js.org) to compile frontend assets and
+it has a minimum requirement of node v4.3.0.  We are also replacing the use of
+`npm` with `yarn` to install node modules going forward as it is faster and
+less error prone.
+
+You can check which version you are running with `node -v`.
+
+If you are running a version older than `v4.3.0` you will should 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/>
+<https://nodejs.org/en/download/package-manager/>
+
+Install Yarn:
+
+If you do not have yarn installed, you will need to install this as well.
+Instructions to compile from source or install from a package repository can be
+found on yarnpkg.com:
+
+<https://yarnpkg.com/en/docs/install>
+
+### 5. Get latest code
 
 ```bash
 cd /home/git/gitlab
@@ -76,7 +100,7 @@ cd /home/git/gitlab
 sudo -u git -H git checkout 8-17-stable-ee
 ```
 
-### 5. Install libs, migrations, etc.
+### 6. Install libs, migrations, etc.
 
 ```bash
 cd /home/git/gitlab
@@ -93,13 +117,16 @@ sudo -u git -H bundle clean
 # Run database migrations
 sudo -u git -H bundle exec rake db:migrate RAILS_ENV=production
 
+# Install/update frontend asset dependencies
+sudo -u git -H yarn install
+
 # Clean up assets and cache
-sudo -u git -H bundle exec rake assets:clean assets:precompile cache:clear RAILS_ENV=production
+sudo -u git -H bundle exec rake gitlab:assets:clean gitlab:assets:compile 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).
 
-### 6. Update gitlab-workhorse
+### 7. 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
@@ -111,7 +138,7 @@ cd /home/git/gitlab
 sudo -u git -H bundle exec rake "gitlab:workhorse:install[/home/git/gitlab-workhorse]" RAILS_ENV=production
 ```
 
-### 7. Update gitlab-shell
+### 8. Update gitlab-shell
 
 ```bash
 cd /home/git/gitlab-shell
@@ -120,7 +147,7 @@ sudo -u git -H git fetch --all --tags
 sudo -u git -H git checkout v4.1.1
 ```
 
-### 8. Update configuration files
+### 9. Update configuration files
 
 #### New configuration options for `gitlab.yml`
 
@@ -194,14 +221,14 @@ For Ubuntu 16.04.1 LTS:
 sudo systemctl daemon-reload
 ```
 
-### 9. Start application
+### 10. Start application
 
 ```bash
 sudo service gitlab start
 sudo service nginx restart
 ```
 
-### 10. Check application status
+### 11. Check application status
 
 Check if GitLab and its environment are configured correctly: