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34 lines
1.4 KiB
34 lines
1.4 KiB
#!/bin/sh
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# DISCLAIMER
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# Heavily inspired by / copied from https://github.com/kubernetes-sigs/kind/pull/1414/files#diff-3c55751d83af635109cece495ee2ff38206764a8b95f4cb8f11fc08a5c0ea8dc
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# Apache 2.0 License (Kubernetes Authors): https://github.com/kubernetes-sigs/kind/blob/9222508298c50ce8c5ba1f364f37307e81ba915e/LICENSE
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set -o errexit
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set -o nounset
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docker_dns="127.0.0.11"
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gateway="GATEWAY_IP" # replaced within k3d Go code
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echo "[$(date -Iseconds)] [DNS Fix] Use the detected Gateway IP $gateway instead of Docker's embedded DNS ($docker_dns)"
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# Change iptables rules added by Docker to route traffic to out Gateway IP instead of Docker's embedded DNS
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echo "[$(date -Iseconds)] [DNS Fix] > Changing iptables rules ..."
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iptables-save \
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| sed \
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-e "s/-d ${docker_dns}/-d ${gateway}/g" \
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-e 's/-A OUTPUT \(.*\) -j DOCKER_OUTPUT/\0\n-A PREROUTING \1 -j DOCKER_OUTPUT/' \
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-e "s/--to-source :53/--to-source ${gateway}:53/g"\
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| iptables-restore
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# Update resolv.conf to use the Gateway IP if needed: this will also make CoreDNS use it via k3s' default `forward . /etc/resolv.conf` rule in the CoreDNS config
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grep -q "${docker_dns}" /etc/resolv.conf
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grepstatus=$?
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if test $grepstatus -eq 0; then
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echo "[$(date -Iseconds)] [DNS Fix] > Replacing IP in /etc/resolv.conf ..."
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cp /etc/resolv.conf /etc/resolv.conf.original
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sed -e "s/${docker_dns}/${gateway}/g" /etc/resolv.conf.original >/etc/resolv.conf
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fi
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echo "[$(date -Iseconds)] [DNS Fix] Done"
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