Merge pull request #23 from SovereignCloudStack/feat/warn-wrong-mtu

Feat/warn wrong mtu

Author: garloff

01-kind-cluster.sh

@@ -5,8 +5,9 @@ DEV=$(ip route show default | head -n1 | sed 's/^.*dev \([^ ]*\).*$/\1/')
 CLOUDMTU=$(ip link show $DEV | head -n1 | sed 's/^.*mtu \([0-9]*\) .*$/\1/')
 DOCKERMTU=$(ip link show docker0 | head -n1 | sed 's/^.*mtu \([0-9]*\) .*$/\1/')
 if test $DOCKERMTU -gt $CLOUDMTU; then
-	echo "WARNING: Consider setting mtu to $((8*($CLOUDMTU/8))) in /etc/docker/daemon.json"
+	echo "WARNING: Consider setting { \"mtu\": $((8*($CLOUDMTU/8))) } in /etc/docker/daemon.json"
 	echo "  and restart docker and do docker network rm kind ..."
+	echo "If you see ImagePullBackOff and ImagePullErrors, you now know why."
 	sudo ip link set dev docker0 mtu $((8*($CLOUDMTU/8)))
 	# Just in case ...
 	sudo sysctl net.ipv4.tcp_mtu_probing=1