span>|</span> By Vadim Eisenberg</p><div><p>In the <a href=/v1.15/blog/2018/egress-tcp/>Consuming External TCP Services</a> blog post, I described how external services
can be consumed by in-mesh Istio applications via TCP. In this post, I demonstrate consuming external MongoDB services.
You use the <a href=/v1.15/docs/examples/bookinfo/>Istio Bookinfo sample application</a>, the version in which the book
ratings data is persisted in a MongoDB database. You deploy this database outside the cluster and confi