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# Elevate to a superuser shell
sudo su

# Create a systemd drop-in to set the Docker MTU
mkdir -p /etc/systemd/system/docker.service.d/
bash -c "echo '[Service]
Environment=\"DOCKER_OPT_MTU=--mtu=1454\"' > /etc/systemd/system/docker.service.d/10-docker0.conf"

# Then reload / restart your Docker daemon
systemctl stop docker
systemctl daemon-reload
systemctl start docker