Commit Graph

120 Commits (d0ebb2b774220b4194463edf95a28c9f290a081b)

Author SHA1 Message Date
Kit Patella 15af5ead0b trim help strings to save a few bytes 2020-11-16 11:02:11 -08:00
Kit Patella 5da2f1efa8 finish adding static server metrics 2020-11-13 16:26:08 -08:00
Kit Patella 24a2471029 first pass on agent-configured prometheusDefs and adding defs for every consul metric 2020-11-12 18:12:12 -08:00
Daniel Nephin 9b1944dae0 dns: remove goto INVALID and a naked return
This commit is one small step toward modernizing and making the DNSServer readable.
2020-10-21 15:16:03 -04:00
Daniel Nephin 529f252d5c rpcclient: Add health.Client and use it in http and dns
This new package provides a client agent implementation of an interface
for fetching the health of services.

This approach has a number of benefits:

1. It provides a much more explicit interface. Instead of everything
   dependency on `RPC()` and `Cache.Get()` for many unrelated things
   they can depend on a type that are named according to the behaviour
   it provides.

2. It gives us a single place to vary the behaviour and migrate to
   a new form of RPC (gRPC). The current implementation has two options
   (cache, or direct RPC), and in the future we will have more.
   It is also a great opporunity to start adding `context.Context` args
   to these operations, which in the future will allow us to cancel
   the operations.

3. As a concequence of the first, in the Server agent where we make
   these calls we can replace the current in-memory RPC calls with
   a thin adapter for the real method. This removes the `net/rpc`
   machinery from the call in places where it is not needed.

This new package is quite small right now, but I think we can expect it
to grow to a more reasonable size as other RPC calls are replaced.

This change also happens to replace two very similar implementations with
a single implementation.
2020-10-04 18:55:02 -04:00
Daniel Nephin 27b36bfc4e config: move NodeName validation to config validation
Previsouly it was done in Agent.Start, which is much later then it needs to be.

The new 'dns' package was required, because otherwise there would be an
import cycle. In the future we should move more of the dns server into
the dns package.
2020-08-17 17:25:02 -04:00
Yury Evtikhov 10361dd210 DNS: add IsErrQueryNotFound function for easier error evaluation 2020-07-01 03:41:44 +01:00
Yury Evtikhov 8d18422f19 DNS: fix agent returning SERVFAIL where NXDOMAIN should be returned 2020-07-01 01:51:21 +01:00
Daniel Nephin a891ee8428
Merge pull request #8176 from hashicorp/dnephin/add-linter-unparam-1
lint: add unparam linter and fix some of the issues
2020-06-25 15:34:48 -04:00
Chris Piraino b3db907bdf Update gateway-services-nodes API endpoint to allow multiple addresses
Previously, we were only returning a single ListenerPort for a single
service. However, we actually allow a single service to be serviced over
multiple ports, as well as allow users to define what hostnames they
expect their services to be contacted over. When no hosts are defined,
we return the default ingress domain for any configured DNS domain.

To show this in the UI, we modify the gateway-services-nodes API to
return a GatewayConfig.Addresses field, which is a list of addresses
over which the specific service can be contacted.
2020-06-24 16:35:23 -05:00
Daniel Nephin f65e21e6dc Remove unused return values 2020-06-24 13:00:15 -04:00
Daniel Nephin 010a609912 Fix a bunch of unparam lint issues 2020-06-24 13:00:14 -04:00
Pierre Souchay 35d852fd9a
Returns DNS Error NSDOMAIN when DC does not exists (#8103)
This will allow to increase cache value when DC is not valid (aka
return SOA to avoid too many consecutive requests) and will
distinguish DC being temporarily not available from DC not existing.

Implements https://github.com/hashicorp/consul/issues/8102
2020-06-22 09:01:48 -04:00
Matt Keeler 8837907de4
Make the Agent Cache more Context aware (#8092)
Blocking queries issues will still be uncancellable (that cannot be helped until we get rid of net/rpc). However this makes it so that if calling getWithIndex (like during a cache Notify go routine) we can cancell the outer routine. Previously it would keep issuing more blocking queries until the result state actually changed.
2020-06-15 11:01:25 -04:00
Kyle Havlovitz e9e8c0e730
Ingress Gateways for TCP services (#7509)
* Implements a simple, tcp ingress gateway workflow

This adds a new type of gateway for allowing Ingress traffic into Connect from external services.

Co-authored-by: Chris Piraino <cpiraino@hashicorp.com>
2020-04-16 14:00:48 -07:00
Pierre Souchay c9e01ed0a3 Pre-allocations of DNS meta to avoid several allocations 2020-04-05 11:12:41 +02:00
Daniel Nephin 326453eaa1 dns: Remove a few unused params 2020-03-24 15:56:41 -04:00
Matt Keeler 861f754dad
Properly detect no alt domain set (#7323) 2020-02-19 14:41:43 -05:00
Wim 3a2c865ff6
Fix high cpu usage with IPv6 recursor address. Closes #6120 (#6128) 2020-02-18 11:09:11 -05:00
Chris Piraino 401221de58
Allow users to configure either unstructured or JSON logging (#7130)
* hclog Allow users to choose between unstructured and JSON logging
2020-01-28 17:50:41 -06:00
Aestek ba8fd8296f Add support for dual stack IPv4/IPv6 network (#6640)
* Use consts for well known tagged adress keys

* Add ipv4 and ipv6 tagged addresses for node lan and wan

* Add ipv4 and ipv6 tagged addresses for service lan and wan

* Use IPv4 and IPv6 address in DNS
2020-01-17 09:54:17 -05:00
Wim 4f5d5020b8 dns: fix memoryleak by upgrading outdated miekg/dns (#6748)
* Add updated github.com/miekg/dns to go modules
* Add updated github.com/miekg/dns to vendor
* Fix github.com/miekg/dns api breakage
* Decrease size when trimming UDP packets
Need more room for the header(?), if we don't decrease the size we get an
"overflow unpacking uint32" from the dns library
* Fix dns truncate tests with api changes
* Make windows build working again. Upgrade x/sys and x/crypto and vendor
This upgrade is needed because of API breakage in x/sys introduced
by the minimal x/sys dependency of miekg/dns

This API breakage has been fixed in commit
855e68c859
2019-12-16 22:31:27 +01:00
Matt Keeler 5934f803bf
Sync of OSS changes to support namespaces (#6909) 2019-12-09 21:26:41 -05:00
Nicolas Benoit 0e9a2e5bd0 Fix dns service SRV lookup when service address is a fqdn
Refactor dns to have same behavior between A and SRV.
Current implementation returns the node name instead of the service
address.
With this fix when querying for SRV record service address is return in
the SRV record.
And when performing a simple dns lookup it returns a CNAME to the
service address.
2019-11-14 16:50:05 +01:00
hashicorp-ci 43bda6fb76 Merge Consul OSS branch 'master' at commit e91f73f592 2019-06-30 02:00:31 +00:00
Akshay Ganeshen 98a35fbe69 dns: support alt domains for dns resolution (#5940)
this adds an option for an alt domain to be used with dns while migrating to a new consul domain.
2019-06-27 12:00:37 +02:00
Matt Keeler f3d9b999ee
Add tagged addresses for services (#5965)
This allows addresses to be tagged at the service level similar to what we allow for nodes already. The address translation that can be enabled with the `translate_wan_addrs` config was updated to take these new addresses into account as well.
2019-06-17 10:51:50 -04:00
Pierre Souchay 4a4c63bda0 Ensure Consul is IPv6 compliant (#5468) 2019-06-04 10:02:38 -04:00
Aestek f669bb7b0f Add support for DNS config hot-reload (#4875)
The DNS config parameters `recursors` and `dns_config.*` are now hot
reloaded on SIGHUP or `consul reload` and do not need an agent restart
to be modified.
Config is stored in an atomic.Value and loaded at the beginning of each
request. Reloading only affects requests that start _after_ the
reload. Ongoing requests are not affected. To match the current
behavior the recursor handler is loaded and unloaded as needed on config
reload.
2019-04-24 14:11:54 -04:00
R.B. Boyer f4a3b9d518
fix typos reported by golangci-lint:misspell (#5434) 2019-03-06 11:13:28 -06:00
Aestek 02f991843f Fix race condition in DNS when using cache (#5398)
* Fix race condition in DNS when using cache

The healty node filtering was modifying the result from the cache, which
caused a crash when multiple queries were made to the same service
simultaneously.
We now copy the node slice before filtering to ensure we do not modify
the data stored in the cache.

* Fix wording in dns cache config doc

s/dns_max_age/cache_max_age/
2019-03-04 09:22:01 -05:00
Aestek f1cdfbe40e Allow DNS interface to use agent cache (#5300)
Adds two new configuration parameters "dns_config.use_cache" and
"dns_config.cache_max_age" controlling how DNS requests use the agent
cache when querying servers.
2019-02-25 14:06:01 -05:00
Matt Keeler 1736e24fb3
Don't generate TXT records just to discard them (#5272)
* Don't generate TXT records just to discard them

* Add unit test for formatNodeRecord to ensure it prevents returning TXT records
2019-01-28 14:59:58 -05:00
Pierre Souchay ae7f88f995 Avoid to have infinite recursion in DNS lookups when resolving CNAMEs (#4918)
* Avoid to have infinite recursion in DNS lookups when resolving CNAMEs

This will avoid killing Consul when a Service.Address is using CNAME
to a Consul CNAME that creates an infinite recursion.

This will fix https://github.com/hashicorp/consul/issues/4907

* Use maxRecursionLevel = 3 to allow several recursions
2019-01-07 16:53:54 -05:00
Paul Banks b29bc906ee
bugfix: use ServiceTags to generate cache key hash (#4987)
* bugfix: use ServiceTags to generate cahce key hash

* update unit test

* update

* remote print log

* Update .gitignore

* Completely deprecate ServiceTag field internally for clarity

* Add explicit test for CacheInfo cases
2019-01-07 21:30:47 +00:00
Pierre Souchay fab55bee2b dns: implements prefix lookups for DNS TTL (#4605)
This will fix https://github.com/hashicorp/consul/issues/4509 and allow forinstance lb-* to match services lb-001 or lb-service-007.
2018-10-19 08:41:04 -07:00
Pierre Souchay 251156eb68 Added SOA configuration for DNS settings. (#4714)
This will allow to fine TUNE SOA settings sent by Consul in DNS responses,
for instance to be able to control negative ttl.

Will fix: https://github.com/hashicorp/consul/issues/4713

# Example

Override all settings:

* min_ttl: 0 => 60s
* retry: 600 (10m) => 300s (5 minutes),
* expire: 86400 (24h) => 43200 (12h)
* refresh: 3600 (1h) => 1800 (30 minutes)

```
consul agent -dev -hcl 'dns_config={soa={min_ttl=60,retry=300,expire=43200,refresh=1800}}'
```

Result:
```
dig +multiline @localhost -p 8600 service.consul

; <<>> DiG 9.12.1 <<>> +multiline @localhost -p 8600 service.consul
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 36557
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;service.consul.		IN A

;; AUTHORITY SECTION:
consul.			0 IN SOA ns.consul. hostmaster.consul. (
				1537959133 ; serial
				1800       ; refresh (30 minutes)
				300        ; retry (5 minutes)
				43200      ; expire (12 hours)
				60         ; minimum (1 minute)
				)

;; Query time: 4 msec
;; SERVER: 127.0.0.1#8600(127.0.0.1)
;; WHEN: Wed Sep 26 12:52:13 CEST 2018
;; MSG SIZE  rcvd: 93
```
2018-10-10 15:50:56 -04:00
Matt Keeler d3ee66eed4
Add ECS option to EDNS responses where appropriate (#4647)
This implements parts of RFC 7871 where Consul is acting as an authoritative name server (or forwarding resolver when recursors are configured)

If ECS opt is present in the request we will mirror it back and return a response with a scope of 0 (global) or with the same prefix length as the request (indicating its valid specifically for that subnet).

We only mirror the prefix-length (non-global) for prepared queries as those could potentially use nearness checks that could be affected by the subnet. In the future we could get more sophisticated with determining the scope bits and allow for better caching of prepared queries that don’t rely on nearness checks.

The other thing this does not do is implement the part of the ECS RFC related to originating ECS headers when acting as a intermediate DNS server (forwarding resolver). That would take a quite a bit more effort and in general provide very little value. Consul will currently forward the ECS headers between recursors and the clients transparently, we just don't originate them for non-ECS clients to get potentially more accurate "location aware" results.
2018-09-11 09:37:46 -04:00
Pierre Souchay eddcf228ea Implementation of Weights Data structures (#4468)
* Implementation of Weights Data structures

Adding this datastructure will allow us to resolve the
issues #1088 and #4198

This new structure defaults to values:
```
   { Passing: 1, Warning: 0 }
```

Which means, use weight of 0 for a Service in Warning State
while use Weight 1 for a Healthy Service.
Thus it remains compatible with previous Consul versions.

* Implemented weights for DNS SRV Records

* DNS properly support agents with weight support while server does not (backwards compatibility)

* Use Warning value of Weights of 1 by default

When using DNS interface with only_passing = false, all nodes
with non-Critical healthcheck used to have a weight value of 1.
While having weight.Warning = 0 as default value, this is probably
a bad idea as it breaks ascending compatibility.

Thus, we put a default value of 1 to be consistent with existing behaviour.

* Added documentation for new weight field in service description

* Better documentation about weights as suggested by @banks

* Return weight = 1 for unknown Check states as suggested by @banks

* Fixed typo (of -> or) in error message as requested by @mkeeler

* Fixed unstable unit test TestRetryJoin

* Fixed unstable tests

* Fixed wrong Fatalf format in `testrpc/wait.go`

* Added notes regarding DNS SRV lookup limitations regarding number of instances

* Documentation fixes and clarification regarding SRV records with weights as requested by @banks

* Rephrase docs
2018-09-07 15:30:47 +01:00
Siva Prasad 865068a358
DNS : Fixes recursors answering the DNS query to properly return the correct response. (#4461)
* Fixes the DNS recursor properly resolving the requests

* Added a test case for the recursor bug

* Refactored code && added a test case for all failing recursors

* Inner indentation moved into else if check
2018-08-02 10:12:52 -04:00
Matt Keeler 0fd7e97c2d Merge remote-tracking branch 'origin/master' into bugfix/prevent-multi-cname 2018-07-10 10:26:45 -04:00
Matt Keeler cbf8f14451 Ensure TXT RRs always end up in the Additional section except for ANY or TXT queries
This also changes where the enforcement of the enable_additional_node_meta_txt configuration gets applied.

formatNodeRecord returns the main RRs and the meta/TXT RRs in separate slices. Its then up to the caller to add to the appropriate sections or not.
2018-07-09 12:30:11 -04:00
Matt Keeler e3783a75e7 Refactor to make this much less confusing 2018-07-03 11:04:19 -04:00
Matt Keeler 554035974e Add a bunch of comments about preventing multi-cname
Hopefully this a bit clearer as to the reasoning
2018-07-03 10:32:52 -04:00
Matt Keeler 22c2be5bf1 Fix some edge cases and add some tests. 2018-07-02 16:58:52 -04:00
Matt Keeler 9a8500412b Only allow 1 CNAME when querying for a service.
This just makes sure that if multiple services are registered with unique service addresses that we don’t blast back multiple CNAMEs for the same service DNS name and keeps us within the DNS specs.
2018-07-02 16:12:06 -04:00
mkeeler 6813a99081 Merge remote-tracking branch 'connect/f-connect' 2018-06-25 19:42:51 +00:00
Kyle Havlovitz 050da22473 connect/ca: undo the interface changes and use sign-self-issued in Vault 2018-06-25 12:25:42 -07:00
Matt Keeler 8216816e3f Make filtering out TXT RRs only apply when they would end up in Additional section
ANY queries are no longer affected.
2018-06-19 10:08:16 -04:00
Mitchell Hashimoto 406366c45b
agent: working DNS for Connect queries, I think, but have to
implement Health endpoints to be sure
2018-06-14 09:41:47 -07:00