Forward DNS requests into --internal networks #47821
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robmry
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May 10, 2024
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cpuguy83
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May 10, 2024
| Source: fname, | ||
| Target: "/etc/dnsd.conf", | ||
| }), | ||
| container.WithCmd("dnsd"), |
A recent change to prevent containers only connected to --internal networks from communicating with external DNS servers inadvertently prevented the daemon's internal DNS server from forwarding requests within an internal network to a containerised DNS server. Relax the check, so that only requests that need to be forwarded from the host's network namespace are dropped. External DNS servers remain unreachable from the internal network. Signed-off-by: Rob Murray <rob.murray@docker.com>
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akerouanton
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May 13, 2024
vvoland
approved these changes
May 14, 2024
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I went ahead and created a backport to have this attached to the 26.1.3 milestone. |
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- What I did
Fixes #47822
#47538 prevents containers only connected to
--internalnetworks from communicating with external DNS servers - it also inadvertently prevents the daemon's internal DNS server from forwarding requests within an internal network to a containerised DNS server.- How I did it
Relax the check, so that only requests that need to be forwarded from the host's network namespace are dropped.
External DNS servers remain unreachable from the internal network.
- How to verify it
New integration test.
- Description for the changelog