This repository was archived by the owner on Apr 26, 2024. It is now read-only.
This repository was archived by the owner on Apr 26, 2024. It is now read-only.
DNS failures connecting to IP address (!) for replication #9865
Description
We had a slew of this sort of error:
2021-04-22 10:12:31,676 - synapse.http.client - 453 - INFO - PUT-1883814-- - Error sending request to POST http://10.103.0.1:8135/_synapse/replication/fed_send_edu/m.direct_to_device/cYKChokZoY: DNSLookupError Couldn't find the hostname '10.103.0.1'
There are two things of concern here:
- we are doing DNS lookups for IP addresses. This is somewhat known, though highly unsatisfactory. It happens within
HostnameEndpointin twisted, which is used fairly widely, including the HTTP Agent. (Raised as https://twistedmatrix.com/trac/ticket/10181) - the fact the DNS lookup failed.