<p>Modify the deployment spec of a version of the <em>ratings</em> microservice that uses a MySQL database, to use your
database instance. The spec is in <a href=https://github.com/istio/istio/blob/release-1.7/samples/bookinfo/platform/kube/bookinfo-ratings-v2-mysql.yaml><code>samples/bookinfo/platform/kube/bookinfo-ratings-v2-mysql.yaml</code></a>
of an Istio release archive. Edit the following lines:</p><pre><code class=language-yaml data-expandlinks=true data-repo=istio>- name: MYSQL_DB_HOST
  value: mys