* plugin/health: add 'overloaded metrics'
Query our on health endpoint and record (and export as a metric) the
time it takes. The Get has a 5s timeout, that, when reached, will set
the metric duration to 5s. The actually call "I'm I overloaded" is left
to an external entity.
* README
* golint and govet
* and the tests
* Align plugin/template usage and syntax with other plugins
* Use new fallthrough logic in plugin/template
* Use zone name normalization for plugin/template
* Test fallthrough parsing in plugin/template
* Rework scoping of match checks
Most matches are not plugin global but per template. The plugin does only a
very rough check while detailed checks are done per-template.
Per template checks include:
- Zones
- Class/Type
- Regex
- Fallthrough
* Remove trailing `.` from fully qualified domain names
* Register template metrics with zone/class/type instead of regex
* Remove trailing fqdn dot from multiple testcases
* Add a template plugin
The template plugin matches the incoming query by class, type and regex
and templates a response with go templates.
* Fix go style errors
* Fix template README example
* Fix corefile example in plugin/template
* Clarify plugin/template/README.md
Add more details and external links where needed.
* Fix code issues in plugin/template
* Add template metrics
* Add section and template to template plugin metrics
* Fix style / remove extra newline on go imports
* Fix typo in plugin/template/README.md
* Update README.md
I've change the format a bit in a PR that I merged yesterday.
* Add authority section to plugin/template
* Fix naming of incoming query name in plugin/template/README.md
* Fix doc syntax in plugin/template/README.md
* Add authority section to plugin/template/README.md config overview
* Add metric labels to plugin/template/README.md metrics section
* Use request.Request to pass state to the template matcher
* Add pkg/fall for Fallthrough
Move this into it's own package to facilitate tests. Important bug
was fixed: make the names fully qualified.
Add fall package to hosts, reverse, etcd, and fix kubernetes and any
tests. The k8s tests are still as-is, might need a future cleanup.
This is probably the first in a series to fix "crazy" pod queries.
If the namespace doesn't exist return NXDOMAIN.
It might be worth extending this 1:1 to findServices as well.
* Add manual pages
Generate manual pages from the README and extend README with Name and
Description sections.
The generation requires 'ronn' which may not be available. Just check in
all generated manual pages.
* plugin/dnssec: implement shotgun from CloudFlare
Put a whole bunch of types in the NSEC bitmap and remove the one that's
being asked for.
Add more records for queries to the apex, SOA, DNSKEY, MX.
* Update k8s client-go to v6.0.0
This fix updates k8s client-go to v6.0.0 as CoreDNS is supported
in 1.9 and v6.0.0 is the recommended version.
There are quite some massive changes that need to be made:
1. k8s.io/client-go/pkg/api/v1 has been changed to k8s.io/api/v1 (repo changed from `client-go` to `api`)
2. kubernetes.Clientset adds one extra layer, so that `kubernetes.Clientset.Services()` and like has been changed to `kubernetes.Clientset.CoreV1().Services()`
Also, we have to stick with specific commits of `k8s.io/apimachinery` and the newly introduced `k8s.io/api`
because go dep still could not figure out the right version to fetch.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
* Update vendor with `dep ensure --update` and `dep prune`
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
After initial startup, see if prometheus is loaded and if so, register
our metrics with it.
Stop doing the init() func and just use the sync.Once so we don't double
registrer our metrics.
This leave most of the code intact, but we need to stop vendoring
prometheus, because, again, plugins what want to use it. Not vendoring
prometheus makes my forward metrics show up again. Code looks bit
convoluted, but works:
~~~
c.OnStartup(func() error {
once.Do(func() {
m := dnsserver.GetConfig(c).Handler("prometheus")
if m == nil {
return
}
if x, ok := m.(*metrics.Metrics); ok {
x.MustRegister(RequestCount)
x.MustRegister(RcodeCount)
x.MustRegister(RequestDuration)
x.MustRegister(HealthcheckFailureCount)
x.MustRegister(SocketGauge)
}
})
})
~~~
* dnstest: add multirecorder
This adds a new recorder that captures all messages written to it. This
can be useful when, for instance, testing AXFR which can write muliple
messages back to the client.
* docs
prometheus.Handler is deprecated according to the godoc for the package so
instead we're using promhttp.
Additionally, we are exposing the Registry that metrics is using so other
plugins that are not inside of coredns can read the registry. Otherwise, if
we kept using the Default one, there's no way to access that from outside
of the coredns repo since it is vendored.
If external plugins wanted to extend metrics there was no way since
zoneNames couldn't be initialized. Now plugins can call New to get an
instance of Metrics that they can extend.
Switched health and autopath plugin to allow any plugins to be used instead
of a hardcoded list. I did not switch federation over since it wasn't
obvious that anything other than kubernetes could be used with it.
Fixes#1291
When z.Tree.Prev returns zero we should break out of this loop, not
use elem as if nothing has happened.
Can be triggered by sending edns0 to unsigned zone.
DS is peculiar and needs some special cases to do the right things.
For a direct query return the DS, but if we're hitting below the
delegation return the NS+DS in a delegation response.
Don't put NS records in the answer section; if we see it is delegated
we should put the records in the AUTHORITY section.
This removes a special case, which is good.
If protocol is https_google we do the health checks wrong, i.e. we're healthchecking the wrong
endpoint, hence the health check code below should not be executed. See issue #1202.
This is an ugly hack and the thing requires a rethink. Possibly in conjunction with moving
to the *forward* plugin.
- added dnstapEncoder object which incapsulates marshalling of dnstap
messages to protobuf and writing data to connection
- dnstapEncoder writes data directly to connection object. It doesn't
use the framestream's "write" method, because it writes data to
intermediate buffer (bufio.Writer) which leads to unnecessary
data copying and drops the performance
- dnstapEncoder reuses a preallocated buffer for marshalling dnstap
messages. Many messages are added to the same buffer. They are
separated with a "frame length" 4-byte values, so the buffer content
is writen to connection object in the format compatible with
framestream library
- added test which guarantees that dnstapEncoder output is the same
as framestream Encoder output
- the performance increase is about 50% in (dio *dnstapIO) serve() method
of dnstap plugin. The overall coredns performance increase is about 10%
in the following configuration:
.:1053 {
erratic {
drop 0
truncate 0
delay 0
}
dnstap tcp://127.0.0.1:6000 full
errors stdout
}
tested with dnsperf tool
This fix tries to address the issue raised in 1275 to clarify
the syntax for multiple endpoints specification.
This fix also adds additional test cases to demo the usage.
This fix fixes 1275.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
* Add NSID plugin support for CoreDNS
This fix adds NSID plugin support for CoreDNS, as was proposed
in 1256.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
* Add test cases for NSID plugin
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
* Generate code for NSID plugin
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
* Use hostname as the default (as with bind), and remove unneeded copy
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
* Add README.md
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
When we failing the healthcheck we should increate the fails for this
host; which is the *bleeping* point of doing the HC in the first place.
Add the missing atomic.Adds.
Fixes#1247
HC for google_https does not work because it does not HC the correct
set of IPs. Hard to solve in the current code - rather use forward as
the new impl. and leave this as legacy.
Remove superfluous println that we are refreshing the dns.google.com IP
address.
* plugin/rewrite: don't set or use ecs.DraftOption
Don't know why we are accessing this and explicitally setting it to
False (the default).
Any kill with fire - makes the build, build again.
* remove this
