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In systemd-resolved hosts with no DNS customizations, the docker driver DNS setting should be compared to /run/systemd/resolve/resolv.conf while exec/java drivers should be compared to /etc/resolv.conf. When system-resolved is enabled, /etc/resolv.conf is a stub that points to 127.0.0.53. Docker avoids this stub because this address isn't accessible from the container. The exec/java drivers that don't create network isolations use the stub though in the default configuration.