84ec780ffc
* New plugin: loop Add a plugin that detects loops. It does this by sending an unique query to our selves. If we see the query more than twice we stop the process. If there isn't a loop, the plugin disables it self and becomes a noop plugin. Signed-off-by: Miek Gieben <miek@miek.nl> |
||
|---|---|---|
| .. | ||
| log_test.go | ||
| loop.go | ||
| loop_test.go | ||
| OWNERS | ||
| README.md | ||
| setup.go | ||
| setup_test.go | ||
loop
Name
loop - detect forwarding loops and halt the server.
Description
The loop plugin will send a random query to ourselves and will then keep track of how many times we see it. If we see it more than twice, we assume CoreDNS is looping and we halt the process.
The plugin will try to send the query for up to 30 seconds. This is done to give CoreDNS enough time to start up. Once a query has been successfully sent loop disables itself to prevent a query of death.
The query send is <random number>.<random number>.zone with type set to HINFO.
Syntax
loop
Examples
Start a server on the default port and load the loop and forward plugins. The forward plugin forwards to it self.
. {
loop
forward . 127.0.0.1
}
After CoreDNS has started it stops the process while logging:
plugin/loop: Seen "HINFO IN 5577006791947779410.8674665223082153551." more than twice, loop detected