Commit Graph

67 Commits

Author SHA1 Message Date
David Taylor e1fcbf4aef DEV: Remove new_version_emails global setting reference
All site settings are now shadowed by global settings, so there is no need to lookup the global setting explicitly
2019-11-20 15:54:09 +00:00
Sam Saffron b4bfc27b19 FEATURE: introduce default application level rate limiting by IP
We have tested rate limiting with admin accounts with block rate limiting for
close to 12 months now on meta.discourse.org.

This has resulted in no degradation of services even to admin accounts that
request a lot of info from the site.

The default of 200 requests a minute and 50 per 10 seconds is very generous.
It simply protects against very aggressive clients.

This setting can be disabled or tweaked using:

DISCOURSE_MAX_REQS_PER_IP_MODE and family.

The only big downside here is in cases when a very large number of users tend
to all come from a single IP.

This can be the case on sites accessing Discourse from an internal network
all sharing the same IP via NAT. Or a misconfigured Discourse that is unable
to resolve IP addresses of users due to proxy mis-configuration.
2019-11-18 15:54:50 +11:00
Sam Saffron ed00f35306 FEATURE: improve performance of anonymous cache
This commit introduces 2 features:

1. DISCOURSE_COMPRESS_ANON_CACHE (true|false, default false): this allows
you to optionally compress the anon cache body entries in Redis, can be
useful for high load sites with Redis that lives on a separate server to
to webs

2. DISCOURSE_ANON_CACHE_STORE_THRESHOLD (default 2), only pop entries into
redis if we observe them more than N times. This avoids situations where
a crawler can walk a big pile of topics and store them all in Redis never
to be used. Our default anon cache time for topics is only 60 seconds. Anon
cache is in place to avoid the "slashdot" effect where a single topic is
hit by 100s of people in one minute.
2019-09-04 17:18:32 +10:00
Régis Hanol 8ef831a1f3 fix the build 2019-08-29 14:17:41 +02:00
Sam Saffron 098f9e8b5b PERF: Run multiple threads for regular job schedules
Under extreme load on large databases certain regular jobs can take quite
a while to run. We need to ensure we never starve a sidekiq from running
mini scheduler, cause without it we are unable to queue stuff such as
heartbeat jobs.
2019-08-29 15:34:36 +10:00
Sam Saffron 8db38de9d7 SECURITY: add rate limiting to anon JS error reporting
This adds a 1 minute rate limit to all JS error reporting per IP. Previously
we would only use the global rate limit.

This also introduces DISCOURSE_ENABLE_JS_ERROR_REPORTING, if it is set to
false then no JS error reporting will be allowed on the site.
2019-08-20 11:29:11 +10:00
Sam Saffron 1f47ed1ea3 PERF: message_bus will be deferred by server when flooded
The message_bus performs a fair amount of work prior to hijacking requests
this change ensures that if there is a situation where the server is flooded
message_bus will inform client to back off for 30 seconds + random(120 secs)

This back-off is ultra cheap and happens very early in the middleware.

It corrects a situation where a flood to message bus could cause the app
to become unresponsive

MessageBus update is here to ensure message_bus gem properly respects
Retry-After header and status 429.

Under normal state this code should never trigger, to disable raise the
value of DISCOURSE_REJECT_MESSAGE_BUS_QUEUE_SECONDS, default is to tell
message bus to go away if we are queueing for 100ms or longer
2019-08-09 17:48:01 +10:00
Sam Saffron 4dcc5f16f1 FEATURE: when under extreme load disable search
The global setting disable_search_queue_threshold
(DISCOURSE_DISABLE_SEARCH_QUEUE_THRESHOLD) which default to 1 second was
added.

This protection ensures that when the application is unable to keep up with
requests it will simply turn off search till it is not backed up.

To disable this protection set this to 0.
2019-07-02 11:22:01 +10:00
Sam Saffron 62141b6316 FEATURE: enable_performance_http_headers for performance diagnostics
This adds support for DISCOURSE_ENABLE_PERFORMANCE_HTTP_HEADERS
when set to `true` this will turn on performance related headers

```text
X-Redis-Calls: 10     # number of redis calls
X-Redis-Time: 1.02    # redis time in seconds
X-Sql-Commands: 102   # number of SQL commands
X-Sql-Time: 1.02      # duration in SQL in seconds
X-Queue-Time: 1.01    # time the request sat in queue (depends on NGINX)
```

To get queue time NGINX must provide: HTTP_X_REQUEST_START

We do not recommend you enable this without thinking, it exposes information
about what your page is doing, usually you would only enable this if you
intend to strip off the headers further down the stream in a proxy
2019-06-05 16:08:11 +10:00
Rafael dos Santos Silva 315a38e0e3 FEATURE: Allow running message_bus in a different redis instance (#7616)
Adds `DISCOURSE_MESSAGE_BUS_REDIS_ENABLED` env var, that when set
to true, will allow Discourse to connect to a different redis
instance for MessageBus needs.

When enabled you can configure the same env vars user for redis,
but prefixed by `MESSAGE_BUS`, eg:

`DISCOURSE_MESSAGE_BUS_REDIS_HOST`
2019-05-28 15:52:43 +10:00
Sam Saffron 6580025af9 FEATURE: add backup directory for mmdb files
This new `DISCOURSE_MAXMIND_BACKUP_PATH` can be used a secondary location
for maxmind db. That way a build machine, for example can cache it on the
host and reuse between builds.

Also per 5bfeef77 added proper error raising for download fails from
dedicated rake task

This also moves "refresh_maxmind_db_during_precompile_days" to a global
setting, it did not make sense in a site setting
2019-05-27 16:51:24 +10:00
Sam Saffron b418857830 DEV: document max_logster_logs in discourse_defaults.conf
This cleans up logster configuration a bit cause we no longer have to
check if we respond_to anything and keeps the logster limit properly
documented

Followup on da578e92
2019-03-22 14:11:40 +11:00
Rishabh ad6ad3f679 DEV: Remove SiteSetting.s3_force_path_style (#7210)
- s3_force_path_style was added as a Minio specific url scheme but it has never been well supported in our code base.
- Our new migrate_to_s3 rake task does not work reliably with path style urls too
- Minio has also added support for virtual style requests i.e the same scheme as AWS S3/DO Spaces so we can rely on that instead of using path style requests.
- Add migration to drop s3_force_path_style from the site_settings table
2019-03-20 14:58:20 +01:00
Sam 8b7a2d1cb7 FEATURE: add setting to bypass sending redis CLIENT commands
Some cloud providers (Google Memorystore) do not support any CLIENT commands

By setting :id to nil in the redis config hash we can avoid these commands.

This adds a special global setting GCE users can enable:
`DISCOURSE_REDIS_SKIP_CLIENT_COMMANDS = true`
2019-01-04 15:08:33 +11:00
Sam 8f35fd4595 FEATURE: remove global settings for redis sentinels
This global setting is never used, configuring Discourse with sentinel is
unsupported.
2019-01-04 15:08:33 +11:00
Sam 70269c7c97 FEATURE: tighter limits on per cluster post rebakes
We have the periodical job that regularly will rebake old posts. This is
used to trickle in update to cooked markdown. The problem is that each rebake
can issue multiple background jobs (post process and pull hotlinked images)

Previously we had no per-cluster limit so cluster running 100s of sites could
flood the sidekiq queue with rebake related jobs.

New system introduces a hard limit of 300 rebakes per 15 minutes across a
cluster to ensure the sidekiq job is not dominated by this.

We also reduced `rebake_old_posts_count` to 80, which is a safer default.
2019-01-04 09:24:46 +11:00
Rishabh a6c589d882 FEATURE: Add custom S3 Endpoint and DigitalOcean Spaces/Minio support for Backups (#6045)
- Add custom S3 Endpoints and DigitalOcean Spaces support
- Add Minio support using 'force_path_style' option and fix uploads to custom endpoint
2018-07-16 14:44:55 +10:00
Sam 87fabdc2f3 FIX: correct pool reaper
This removes a freedom patch and replaces with a custom reaper thread
it also captures an issue where reaper would fail when connections where
empty
2018-06-14 18:22:02 +10:00
Sam ded84a4b58 PERF: improve performance once logged in rate limiter hits
If "logged in" is being forced anonymous on certain routes, trigger
the protection for any requests that spend 50ms queueing

This means that ...

1. You need to trip it by having 3 requests take longer than 1 second in 10 second interval
2. Once tripped, if your route is still spending 50m queueuing it will continue to be protected

This means that site will continue to function with almost no delays while it is scaling up to handle the new load
2018-04-23 11:55:25 +10:00
Sam 59cd7894d9 FEATURE: if site is under extreme load show anon view
If a particular path is being hit extremely hard by logged on users,
revert to anonymous cached view.

This will only come into effect if 3 requests queue for longer than 2 seconds
on a *single* path.

This can happen if a URL is shared with the entire forum base and everyone
is logged on
2018-04-18 16:58:57 +10:00
Blake Erickson 720dd2432e remove change from descourse_defaults.conf 2018-04-10 14:27:03 -06:00
Blake Erickson 0337a8f6d5 ensure correct '/'s for relative_url_root in route file 2018-04-10 14:24:29 -06:00
Guo Xiang Tan a89f3160a5 Add new config to ensure backup/restore connects to PG directly.
* In `pg_dump` 10.3+ and 9.5.12+, in
  it does a `SELECT pg_catalog.set_config('search_path', '', false)`
  which changes the state of the current connection. This is known
  to be problematic with Pgbouncer which reuses connections. As such,
  we'll always try to connect directly to PG directly during
  the backup/restore process.
2018-03-09 10:28:03 +08:00
Sam f0d5f83424 FEATURE: limit assets less that non asset paths
By default assets can be requested up to 200 times per 10 seconds
from the app, this includes CSS and avatars
2018-03-06 15:20:39 +11:00
Sam f26ff290c3 FEATURE: Shorten setting name to max_reqs
So it is consistent with other settings
2018-01-22 13:18:30 +11:00
Sam cecd7d0d07 FEATURE: global rate limiter can bypass local IPs 2018-01-08 08:39:17 +11:00
Sam 4986ebcf24 FEATURE: optional default off global per ip rate limiter 2017-12-11 17:52:57 +11:00
Sam 68d3c2c74f FEATURE: add global rate limiter for admin api 60 per minute
Also move configuration of admin and user api rate limiting into global
settings. This is not intended to be configurable per site
2017-12-11 11:07:22 +11:00
Guo Xiang Tan 6c04eb911d Fix typo. 2017-10-17 12:34:49 +08:00
Guo Xiang Tan b54eb8f53c FIX: Set PG `connect_timeout` to 5 seconds.
* 30 seconds is alittle too long.
2017-10-17 12:32:41 +08:00
Sam 70bb2aa426 FEATURE: allow specifying s3 config via globals
This refactors handling of s3 so it can be specified via GlobalSetting

This means that in a multisite environment you can configure s3 uploads
without actual sites knowing credentials in s3

It is a critical setting for situations where assets are mirrored to s3.
2017-10-06 16:20:01 +11:00
Sam c106ca6778 FEATURE: fallback asset path for multi host setups 2017-03-20 15:59:17 -04:00
Sam ff49f72ad9 FEATURE: per client user tokens
Revamped system for managing authentication tokens.

- Every user has 1 token per client (web browser)
- Tokens are rotated every 10 minutes

New system migrates the old tokens to "legacy" tokens,
so users still remain logged on.

Also introduces weekly job to expire old auth tokens.
2017-02-07 09:22:16 -05:00
Guo Xiang Tan 89b1998174 Add default port for redis_slave. 2016-03-11 15:07:07 +08:00
Guo Xiang Tan c07c474575 FEATURE: Master-Slave Redis configuration with fallback and switch over. 2016-03-11 12:18:58 +08:00
Guo Xiang Tan 46589a1a0c FEATURE: AR adapter to failover to a replica DB server. 2016-02-05 08:51:10 +08:00
Sam Saffron 209b022385 PERF: cut down on memory usage allowed to redis
This limits the amount of backlog message bus channels can have.
2016-02-04 13:58:38 +11:00
Sam dfe3ecb914 PERF: disable prepared statements
see: https://github.com/rails/rails/issues/21992
2015-10-19 14:02:22 +11:00
Sam 805120fc95 FEATURE: add connnection reaping based on maximum age
This feature ensures connections to the db are always attempted to be closed
after 600 seconds of idle time.
2015-10-17 11:29:16 +11:00
Sam 786cf6e61f format does not allow numbers 2015-07-23 15:33:38 +10:00
Sam c056c3ba7e FEATURE: allow users to specify a second hostname if needed
(very rarely needed feature, mostly for multisite and origin pull cdns)
2015-07-23 15:22:54 +10:00
Sam 8252f4e110 FEATURE: allow use of redis sentinel via redis_sentinels
Use: DISCOURSE_REDIS_SENTINELS and DISCOURSE_REDIS_HOST to configure redis
sentinel
2015-06-25 16:51:48 +10:00
Sam f3188ab8f2 remove unused setting 2015-04-30 12:06:32 +10:00
Sam f5af4768eb FEATURE: add clean support for running Discourse in a subfolder
To setup set DISCOURSE_RELATIVE_URL_ROOT to the folder you wish
2015-03-09 13:14:29 +11:00
Sam fff55e0ee3 FEATURE: allow users to specify if prepared statements are allowed
(they need to be disabled for pgpool based setups)
2015-02-18 11:16:53 +11:00
Sam d56b71851b FEATURE: configurable connection reaping settings 2015-02-17 09:58:43 +11:00
Neil Lalonde f88075cbba FEATURE: CORS settings per-site in a multisite env 2014-10-15 15:20:39 -04:00
Sam 2be03371ae FEATURE: allow a central redis cache for assets 2014-09-23 16:50:17 +10:00
Sam f493eb5d12 FEATURE: allow version emails to be disabled globally 2014-08-23 10:02:32 +10:00
Zohar Arad 557af8b8bd Add RTL support to Discourse CSS pre-processing using the RTLit gem and configurable via discourse.conf 2014-08-08 09:31:31 +03:00