You can try increasing process_limit for dns-client. Also installing nscd often
helps (or a local resolver).
Aki
On 15/07/2024 16:51 EEST m--- via dovecot <dovecot@dovecot.org>
wrote:
When using DNS names for backends in a proxied setup, the async
dns_client process after a short time of high load (burst scenario)
seems to get overwhelmed:
auth: Debug: conn unix:dns-client: dns(backend.local): Lookup failed
after 0 msecs: Failed to connect to dns-client: Resource temporarily
unavailable
auth: Error: DNS lookup for backend.local failed: Failed to connect
to dns-client: Resource temporarily unavailable
The whole thing itself runs for a few thousand requests until this
happens. ulimit nofile is set to 65000.
When changing the backend from DNS name to IP, there is no problem.
What are the possibilities to use dns names but without these
problems? Any way to either increase dns resolving capacity OR cache
the results for some time (or forever?)?
Best regards
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