prometheus

Commit Graph

Author	SHA1	Message	Date
Erik Hollensbe	be3c082539	discovery/dns/dns.go: fix handling of truncated dns records https://github.com/miekg/dns/pull/815 goes into the detail, but more or less the existing solution was no longer supported and needed to be rewritten to support the new versions of the library. miekg additionally claims this is more correct in the ticket. Signed-off-by: Erik Hollensbe <github@hollensbe.org>	6 years ago
tariqibrahim	b173de0c26	fix ineffectual assignment in dns.go Signed-off-by: tariqibrahim <tariq181290@gmail.com>	6 years ago
Ben Kochie	c6399296dc	Fix spelling/typos (#4921 ) * Fix spelling/typos Fix spelling/typos reported by codespell/misspell. * UK -> US spelling changes. Signed-off-by: Ben Kochie <superq@gmail.com>	6 years ago
Goutham Veeramachaneni	f988af7235	Revert #4586 (#4766 ) This breaks people if they are depending on the contents of __address__ label. Signed-off-by: Goutham Veeramachaneni <gouthamve@gmail.com>	6 years ago
Bryan Boreham	968f657eaa	Stop removing the final dot from rooted DNS names (#4586 ) Removing a final dot changes the meaning of the name and can cause extra DNS lookups as the resolver traverses its search path. Signed-off-by: Bryan Boreham <bjboreham@gmail.com>	6 years ago
Manos Fokas	25f929b772	Yaml UnmarshalStrict implementation. (#4033 ) * Updated yaml vendor package. * remove checkOverflow duplicate in rulefmt * remove duplicated HTTPClientConfig.Validate() * Added yaml static check.	7 years ago
Matt Palmer	042090a6d3	[dns_sd] Send an EDNS0 query by default (#3586 ) Based on https://groups.google.com/d/topic/prometheus-users/02kezHbuea4/discussion Does not attempt to handle a situation where the server does not understand EDNS0, however that is an unlikely case, and the behaviour of such ancient systems is hard to predict in advance, so if it does come up, it will need to be handled on a case-by-case basis.	7 years ago
Callum Styan	97464236c7	comments with TargetProvider should read Discoverer instead (#3667 )	7 years ago
Shubheksha Jalan	ec94df49d4	Refactor SD configuration to remove `config` dependency (#3629 ) * refactor: move targetGroup struct and CheckOverflow() to their own package * refactor: move auth and security related structs to a utility package, fix import error in utility package * refactor: Azure SD, remove SD struct from config * refactor: DNS SD, remove SD struct from config into dns package * refactor: ec2 SD, move SD struct from config into the ec2 package * refactor: file SD, move SD struct from config to file discovery package * refactor: gce, move SD struct from config to gce discovery package * refactor: move HTTPClientConfig and URL into util/config, fix import error in httputil * refactor: consul, move SD struct from config into consul discovery package * refactor: marathon, move SD struct from config into marathon discovery package * refactor: triton, move SD struct from config to triton discovery package, fix test * refactor: zookeeper, move SD structs from config to zookeeper discovery package * refactor: openstack, remove SD struct from config, move into openstack discovery package * refactor: kubernetes, move SD struct from config into kubernetes discovery package * refactor: notifier, use targetgroup package instead of config * refactor: tests for file, marathon, triton SD - use targetgroup package instead of config.TargetGroup * refactor: retrieval, use targetgroup package instead of config.TargetGroup * refactor: storage, use config util package * refactor: discovery manager, use targetgroup package instead of config.TargetGroup * refactor: use HTTPClient and TLS config from configUtil instead of config * refactor: tests, use targetgroup package instead of config.TargetGroup * refactor: fix tagetgroup.Group pointers that were removed by mistake * refactor: openstack, kubernetes: drop prefixes * refactor: remove import aliases forced due to vscode bug * refactor: move main SD struct out of config into discovery/config * refactor: rename configUtil to config_util * refactor: rename yamlUtil to yaml_config * refactor: kubernetes, remove prefixes * refactor: move the TargetGroup package to discovery/ * refactor: fix order of imports	7 years ago
Julius Volz	099df0c5f0	Migrate "golang.org/x/net/context" -> "context" (#3333 ) In some places, where ctxhttp or gRPC are concerned, we still need to use the old contexts.	7 years ago
Fabian Reinartz	2d0b8e8b94	Merge branch 'master' into dev-2.0	7 years ago
Matt Palmer	3369422327	Improve DNS response handling to prevent "stuck" records [Fixes #2799 ] (#3138 ) The problem reported in #2799 was that in the event that all records for a name were removed, the target group was never updated to be the "empty" set. Essentially, whatever Prometheus last saw as a non-empty list of targets would stay that way forever (or at least until Prometheus restarted...). This came about because of a fairly naive interpretation of what a valid-looking DNS response actually looked like -- essentially, the only valid DNS responses were ones that had a non-empty record list. That's fine as long as your config always lists only target names which have non-empty record sets; if your environment happens to legitimately have empty record sets sometimes, all hell breaks loose (otherwise-cleanly shutdown systems trigger up==0 alerts, for instance). This patch is a refactoring of the DNS lookup behaviour that maintains existing behaviour with regard to search paths, but correctly handles empty and non-existent record sets. RFC1034 s4.3.1 says there's three ways a recursive DNS server can respond: 1. Here is your answer (possibly an empty answer, because of the way DNS considers all records for a name, regardless of type, when deciding whether the name exists). 2. There is no spoon (the name you asked for definitely does not exist). 3. I am a teapot (something has gone terribly wrong). Situations 1 and 2 are fine and dandy; whatever the answer is (empty or otherwise) is the list of targets. If something has gone wrong, then we shouldn't go updating the target list because we don't really know what the target list should be. Multiple DNS servers to query is a straightforward augmentation; if you get an error, then try the next server in the list, until you get an answer or run out servers to ask. Only if all the servers return errors should you return an error to the calling code. Where things get complicated is the search path. In order to be able to confidently say, "this name does not exist anywhere, you can remove all the targets for this name because it's definitely GORN", at least one server for all the possible names need to return either successful-but-empty responses, or NXDOMAIN. If any name errors out, then -- since that one might have been the one where the records came from -- you need to say "maintain the status quo until we get a known-good response". It is possible, though unlikely, that a poorly-configured DNS setup (say, one which had a domain in its search path for which all configured recursive resolvers respond with REFUSED) could result in the same "stuck" records problem we're solving here, but the DNS configuration should be fixed in that case, and there's nothing we can do in Prometheus itself to fix the problem. I've tested this patch on a local scratch instance in all the various ways I can think of: 1. Adding records (targets get scraped) 2. Adding records of a different type 3. Remove records of the requested type, leaving other type records intact (targets don't get scraped) 4. Remove all records for the name (targets don't get scraped) 5. Shutdown the resolver (targets still get scraped) There's no automated test suite additions, because there isn't a test suite for DNS discovery, and I was stretching my Go skills to the limit to make this happen; mock objects are beyond me.	7 years ago
Fabian Reinartz	d21f149745	*: migrate to go-kit/log	7 years ago
Chris Goller	42de0ae013	Use log.Logger interface for all discovery services	8 years ago
Tobias Schmidt	58cd39aacd	Follow golang naming conventions in discovery packages	8 years ago
James Hartig	865f28bb15	discovery: Instead of looping over conf.Search, use NameList()	8 years ago
Fabian Reinartz	d19d1bcad3	discovery: move into top-level package	8 years ago

17 Commits (a5c20642b3694f3674a607d48d70cc4272acc3f6)