Geo: Fix GeoNode name in geo:update_primary_node_url rake task

changelogs/unreleased/mk-fix-node-name-vs-url.yml

+---
+title: 'Geo: Fix GeoNode name in geo:update_primary_node_url rake task'
+merge_request: 24649
+author:
+type: fixed

doc/administration/geo/disaster_recovery/index.md

@@ -205,6 +205,25 @@ secondary domain, like changing Git remotes and API URLs.
    This command will use the changed `external_url` configuration defined
    in `/etc/gitlab/gitlab.rb`.
 
+1. For GitLab 11.11 through 12.7 only, you may need to update the primary
+   node's name in the database. This bug has been fixed in GitLab 12.8.
+
+   To determine if you need to do this, search for the
+   `gitlab_rails["geo_node_name"]` setting in your `/etc/gitlab/gitlab.rb`
+   file. If it is commented out with `#` or not found at all, then you will
+   need to update the primary node's name in the database. You can search for it
+   like so:
+
+   ```shell
+   grep "geo_node_name" /etc/gitlab/gitlab.rb
+   ```
+
+   To update the primary node's name in the database:
+
+   ```shell
+   gitlab-rails runner 'Gitlab::Geo.primary_node.update!(name: GeoNode.current_node_name)'
+   ```
+
 1. Verify you can connect to the newly promoted **primary** using its URL.
    If you updated the DNS records for the primary domain, these changes may
    not have yet propagated depending on the previous DNS records TTL.

ee/lib/gitlab/geo/geo_tasks.rb

@@ -27,7 +27,7 @@ module Gitlab
 
         $stdout.puts "Updating primary Geo node with URL #{node.url} ..."
 
-        if node.update(url: GeoNode.current_node_url)
+        if node.update(name: GeoNode.current_node_name, url: GeoNode.current_node_url)
           $stdout.puts "#{node.url} is now the primary Geo node URL".color(:green)
         else
           $stdout.puts "Error saving Geo node:\n#{node.errors.full_messages.join("\n")}".color(:red)

ee/spec/tasks/geo_rake_spec.rb

@@ -283,17 +283,41 @@ describe 'geo rake tasks', :geo do
   end
 
   describe 'geo:update_primary_node_url' do
-    let(:primary_node) { create(:geo_node, :primary, url: 'https://secondary.geo.example.com') }
-
     before do
       allow(GeoNode).to receive(:current_node_url).and_return('https://primary.geo.example.com')
       stub_current_geo_node(primary_node)
     end
 
-    it 'updates Geo primary node URL' do
+    context 'when the machine Geo node name is not explicitly configured' do
+      let(:primary_node) { create(:geo_node, :primary, url: 'https://secondary.geo.example.com', name: 'https://secondary.geo.example.com') }
+
+      before do
+        # As if Gitlab.config.geo.node_name is defaulting to external_url (this happens in an initializer)
+        allow(GeoNode).to receive(:current_node_name).and_return('https://primary.geo.example.com')
+      end
+
+      it 'updates Geo primary node URL and name' do
+        run_rake_task('geo:update_primary_node_url')
+
+        expect(primary_node.reload.url).to eq 'https://primary.geo.example.com/'
+        expect(primary_node.name).to eq 'https://primary.geo.example.com/'
+      end
+    end
+
+    context 'when the machine Geo node name is explicitly configured' do
+      let(:node_name) { 'Brazil DC' }
+      let(:primary_node) { create(:geo_node, :primary, url: 'https://secondary.geo.example.com', name: node_name) }
+
+      before do
+        allow(GeoNode).to receive(:current_node_name).and_return(node_name)
+      end
+
+      it 'updates Geo primary node URL only' do
         run_rake_task('geo:update_primary_node_url')
 
         expect(primary_node.reload.url).to eq 'https://primary.geo.example.com/'
+        expect(primary_node.name).to eq node_name
+      end
     end
   end