Creating a second server and connecting via a cohort¶
Metadata servers can exchange metadata via open metadata repository cohorts. In this session you will learn how to connect two servers via a cohort. But first you need to create a second server.
The docker image that you have been using is isolated in a container. This is good as far as it goes
but is no help when you want to connect it to other servers.
For this next exercise, we are going to use
docker-compose to run a set of docker containers with different
Watch video showing docker compose and the open metadata labs: https://youtu.be/nuRKPfRDKEc
Before you move forward, shut down your egeria docker container using the docker desktop to save cycles on your machine. You can delete it if you do not want it any more.
Set up environment¶
Now download the latest version of Egeria from GitHub in a new directory on your machine. This is a direct copy of the latest content from GitHub.
From within the
egeria/open-metadata-resources/open-metadata-deployment/compose/tutorialsdirectory, run the command:
$ docker-compose -f ./egeria-tutorial.yaml up
You may need to wait while some containers are downloaded . They will then be started, which will likely take less than a minute. Once you see the following lines:
core_1 | Thu Sep 26 19:33:54 GMT 2019 OMAG server platform ready for configuration datalake_1 | Thu Sep 26 19:33:55 GMT 2019 OMAG server platform ready for configuration dev_1 | Thu Sep 26 19:33:56 GMT 2019 OMAG server platform ready for configuration factory_1 | Thu Sep 26 19:33:57 GMT 2019 OMAG server platform ready for configuration
or activity has subsided (as there are many log entries output), your self-contained environment should be ready.
Repeat the previous server configuration exercise twice - once to create a server called
server1 and again to create a server called
Connect the Servers via a Cohort¶
Once you have 2 servers configured, add configuration to each of them to connect them via a cohort.
First read about Open Metadata Repository Cohorts.
Start both servers and view their logs via the Docker Desktop - you should see that they are communicating.
Now use the commands in the
Egeria-repository-services-metadata-highway to query information about
the cohort from each server's perspective.