Commit Graph

10 Commits

Author SHA1 Message Date
David Jimenez d7c4a89106
Add max upstream connections dns-proxy option (#290)
* Add max upstream connections dns-proxy option

Allows defining a limit to the number of connections that can be
established with the upstream DNS host.

If left unset, there may be situations where connections fail to
establish, which causes the Transport to create an influx of connections
causing upstream to throttle our requests and triggering a runaway
effect resulting in high CPU usage. See https://github.com/cloudflare/cloudflared/issues/91

* Code review with proposed changes

* Add max upstream connections flag to tunnel flags

* Reduce DNS proxy max upstream connections default value

Reduce the default value of maximum upstream connections on the DNS
proxy to guarantee it works on single-core and other low-end hardware.
Further testing could allow for a safe increase of this value.

* Update dns-proxy flag name

Also remove `MaxUpstreamConnsFlag` const as it's no longer referenced in more than one place and to make things more consistent with how the other flags are referenced.

Co-authored-by: Adam Chalmers <achalmers@cloudflare.com>
2021-02-12 21:32:29 +04:00
Areg Harutyunyan 55bf904689 TUN-3471: Add structured log context to logs 2021-01-05 20:21:16 +00:00
Areg Harutyunyan 870f5fa907 TUN-3470: Replace in-house logger calls with zerolog 2020-12-23 14:15:17 -06:00
Dalton 046be63253 AUTH-2596 added new logger package and replaced logrus 2020-05-27 17:07:19 -05:00
Austin Cherry f18209af7d ARES-899: Fixes DoH client as system resolver. Fixes #91 2020-04-14 12:37:59 -05:00
Cameron Steel a5f67091bf
Tweak HTTP host header. Fixes #107 (#168) 2020-02-24 17:08:14 +00:00
Frank Denis 9cd0b7048a DoH: change the media type to application/dns-message
The media type for DoH was changed from `application/dns-udpwireformat` to `application/dns-message` in May 2018.

Ref: RFC8484 section 6.
2019-07-03 14:13:28 -05:00
Kane Dou 15d68a0eed make http transport aware of proxy from envvar 2019-02-15 11:26:34 -06:00
Nick Vollmar 62b1ab8c98 TUN-1350: Enhance error messages with cloudflarestatus.com link, if relevant 2019-01-18 13:37:05 -06:00
Areg Harutyunyan d06fc520c7 TUN-528: Move cloudflared into a separate repo 2018-07-19 15:02:24 -05:00