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fix(dns): retry DNS verification and extend proxy readiness wait for Jetson #2038

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Merged
ericksoa merged 3 commits into from
Apr 17, 2026
Merged

fix(dns): retry DNS verification and extend proxy readiness wait for Jetson #2038

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8eb88c4
fix(dns): retry DNS verification and extend proxy readiness wait for …
ericksoa Apr 17, 2026
193546f
Merge branch 'main' into fix/2017-jetson-dns-proxy-timing
ericksoa Apr 17, 2026
e54f995
fix(dns): use printf instead of echo -ne for POSIX portability
ericksoa Apr 17, 2026
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28 changes: 25 additions & 3 deletions scripts/setup-dns-proxy.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -158,7 +158,22 @@ kctl exec -n openshell "$POD" -- \
sh -c "nohup python3 -u /tmp/dns-proxy.py '${DNS_UPSTREAM}' '${VETH_GW}' \
> /tmp/dns-proxy.log 2>&1 &"

sleep 2
# Wait for forwarder to actually be serving (up to 10s).
# The PID file is written before the socket is bound, so we probe
# with a real DNS query instead of just checking the file. See #2017.
_dns_ready=0
for _i in $(seq 1 10); do
if kctl exec -n openshell "$POD" -- \
sh -c "printf '%b' '\x00\x1e\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x06google\x03com\x00\x00\x01\x00\x01' \
| timeout 1 socat - UDP:${VETH_GW}:53 2>/dev/null" | grep -q .; then
_dns_ready=1
break
fi
sleep 1
done
if [ "$_dns_ready" -eq 0 ]; then
echo "WARNING: DNS forwarder not responding after 10s — verification may fail"
fi

# ── Step 4: Allow UDP DNS in sandbox iptables ───────────────────────
#
Expand Down Expand Up @@ -272,12 +287,19 @@ if [ -n "$SANDBOX_NS" ]; then
fi

# 6d. Actual DNS resolution from sandbox (getent hosts)
DNS_RESULT="$(sb_exec getent hosts github.com 2>/dev/null || true)"
# Retry up to 3 times — on slower hardware (Jetson ARM64) the forwarder
# may need a few extra seconds after binding. See #2017.
DNS_RESULT=""
for _dns_try in 1 2 3; do
DNS_RESULT="$(sb_exec getent hosts github.com 2>/dev/null || true)"
[ -n "$DNS_RESULT" ] && break
[ "$_dns_try" -lt 3 ] && sleep 2
done
if [ -n "$DNS_RESULT" ]; then
echo " [PASS] getent hosts github.com -> ${DNS_RESULT}"
VERIFY_PASS=$((VERIFY_PASS + 1))
else
echo " [FAIL] getent hosts github.com returned empty (DNS not resolving)"
echo " [FAIL] getent hosts github.com returned empty after 3 attempts (DNS not resolving)"
VERIFY_FAIL=$((VERIFY_FAIL + 1))
fi
else
Expand Down
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