Comments - MaxScale, "No Master can be determined"
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Trying with fresh installation. It seems that ports to containers are closed. port 3306, mysql, checked with nmap -p 3306 127.17.0.2 --> "closed".
All are now in containers: maxscale and three mariadb servers.
Three mariadb servers are in "Running" state again.
So, maxscale seems to see those servers. Next: how to connect to DB through the maxscale docker container?