Commit Graph

7 Commits

Author SHA1 Message Date
Jakob Borg
916ec63af6 cmd/stdiscosrv: New discovery server (fixes #4618)
This is a new revision of the discovery server. Relevant changes and
non-changes:

- Protocol towards clients is unchanged.

- Recommended large scale design is still to be deployed nehind nginx (I
  tested, and it's still a lot faster at terminating TLS).

- Database backend is leveldb again, only. It scales enough, is easy to
  setup, and we don't need any backend to take care of.

- Server supports replication. This is a simple TCP channel - protect it
  with a firewall when deploying over the internet. (We deploy this within
  the same datacenter, and with firewall.) Any incoming client announces
  are sent over the replication channel(s) to other peer discosrvs.
  Incoming replication changes are applied to the database as if they came
  from clients, but without the TLS/certificate overhead.

- Metrics are exposed using the prometheus library, when enabled.

- The database values and replication protocol is protobuf, because JSON
  was quite CPU intensive when I tried that and benchmarked it.

- The "Retry-After" value for failed lookups gets slowly increased from
  a default of 120 seconds, by 5 seconds for each failed lookup,
  independently by each discosrv. This lowers the query load over time for
  clients that are never seen. The Retry-After maxes out at 3600 after a
  couple of weeks of this increase. The number of failed lookups is
  stored in the database, now and then (avoiding making each lookup a
  database put).

All in all this means clients can be pointed towards a cluster using
just multiple A / AAAA records to gain both load sharing and redundancy
(if one is down, clients will talk to the remaining ones).

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4648
2018-01-14 08:52:31 +00:00
Jakob Borg
24c721cb5d vendor: Update github.com/minio/sha256-simd (fixes #4585)
GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4592
2017-12-12 10:31:27 +00:00
Jakob Borg
a1bcc15458 vendor: Mega update all dependencies
GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4080
2017-04-05 14:34:41 +00:00
Jakob Borg
b84c4e1417 vendor: Update github.com/minio/sha256-simd 2017-03-05 10:12:54 +01:00
Jakob Borg
73cbd17e17 vendor: Update github.com/minio/sha256-simd with patch for mips 2017-03-04 07:48:16 +01:00
Jakob Borg
21eb098dd2 vendor: Update github.com/minio/sha256-simd, CPU detection (Linux) 2016-12-20 09:20:28 +01:00
Jakob Borg
5e99d38412 all: Use github.com/minio/sha256-simd
GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3581
2016-09-09 09:57:51 +00:00