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Document updated on Feb 16, 2021
Commands - check
The krakend check command validates the passed configuration. Since KrakenD does not implement a strict parsing, typos
in the config file could be shadowed. In order to validate your config completely, it is recommended to use the --debug flag.
Usage of KrakenD check
$./krakend check -h
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_______________________________________________________________________
Version: 1.4.1
Validates that the active configuration file has a valid syntax to run the service.
Change the configuration file by using the --config flag
Usage:
krakend check [flags]
Aliases:
check, validate
Examples:
krakend check -d -c config.json
Flags:
-h, --help help for check
-t, --test-gin-routes Test the endpoint patterns against a real gin router on selected port
Global Flags:
-c, --config string Path to the configuration filename
-d, --debug Enable the debugPassing a path to the config file is required
$krakend check
Please, provide the path to your config fileExample
We will use this configuration for the demo
{
"version": 2,
"name": "My lovely gateway",
"port": 8080,
"cache_ttl": "3600s",
"timeout": "3s",
"extra_config": {
"github_com/devopsfaith/krakend-gologging": {
"level": "ERROR",
"prefix": "[KRAKEND]",
"syslog": false,
"stdout": true
}
},
"endpoints": [
{
"endpoint": "/supu",
"method": "GET",
"backend": [
{
"host": [
"http://127.0.0.1:8080"
],
"url_pattern": "/__debug/supu",
"extra_config": {
"github.com/devopsfaith/krakend-martian": {
"fifo.Group": {
"scope": ["request", "response"],
"aggregateErrors": true,
"modifiers": [
{
"header.Modifier": {
"scope": ["request", "response"],
"name" : "X-Martian",
"value" : "ouh yeah!"
}
},
{
"body.Modifier": {
"scope": ["request"],
"contentType" : "application/json",
"body" : "eyJtc2ciOiJ5b3Ugcm9jayEifQ=="
}
},
{
"header.RegexFilter": {
"scope": ["request"],
"header" : "X-Neptunian",
"regex" : "no!",
"modifier": {
"header.Modifier": {
"scope": ["request"],
"name" : "X-Martian-New",
"value" : "some value"
}
}
}
}
]
}
},
"github.com/devopsfaith/krakend-circuitbreaker/gobreaker": {
"interval": 60,
"timeout": 10,
"maxErrors": 1
}
}
}
]
},
{
"endpoint": "/github/{user}",
"method": "GET",
"backend": [
{
"host": [
"https://api.github.com"
],
"url_pattern": "/",
"allow": [
"authorizations_url",
"code_search_url"
],
"disable_host_sanitize": true,
"extra_config": {
"github.com/devopsfaith/krakend-martian": {
"fifo.Group": {
"scope": ["request", "response"],
"aggregateErrors": true,
"modifiers": [
{
"header.Modifier": {
"scope": ["request", "response"],
"name" : "X-Martian",
"value" : "ouh yeah!"
}
},
{
"body.Modifier": {
"scope": ["request"],
"contentType" : "application/json",
"body" : "eyJtc2ciOiJ5b3Ugcm9jayEifQ=="
}
},
{
"header.RegexFilter": {
"scope": ["request"],
"header" : "X-Neptunian",
"regex" : "no!",
"modifier": {
"header.Modifier": {
"scope": ["request"],
"name" : "X-Martian-New",
"value" : "some value"
}
}
}
}
]
}
},
"github.com/devopsfaith/krakend-ratelimit/juju/proxy": {
"maxRate": 2,
"capacity": 2
},
"github.com/devopsfaith/krakend-circuitbreaker/gobreaker": {
"interval": 60,
"timeout": 10,
"maxErrors": 1
}
}
}
]
},
{
"endpoint": "/show/{id}",
"backend": [
{
"host": [
"http://showrss.info/"
],
"url_pattern": "/user/schedule/{id}.rss",
"encoding": "rss",
"group": "schedule",
"allow": ["items", "title"],
"extra_config": {
"github.com/devopsfaith/krakend-ratelimit/juju/proxy": {
"maxRate": 1,
"capacity": 1
},
"github.com/devopsfaith/krakend-circuitbreaker/gobreaker": {
"interval": 60,
"timeout": 10,
"maxErrors": 1
}
}
},
{
"host": [
"http://showrss.info/"
],
"url_pattern": "/user/{id}.rss",
"encoding": "rss",
"group": "available",
"allow": ["items", "title"],
"extra_config": {
"github.com/devopsfaith/krakend-ratelimit/juju/proxy": {
"maxRate": 2,
"capacity": 2
},
"github.com/devopsfaith/krakend-circuitbreaker/gobreaker": {
"interval": 60,
"timeout": 10,
"maxErrors": 1
}
}
}
],
"extra_config": {
"github.com/devopsfaith/krakend-ratelimit/juju/router": {
"maxRate": 50,
"clientMaxRate": 5,
"strategy": "ip"
}
}
}
]
}
Debug disabled
Checking the configuration without the debug flag
$krakend check --config krakend.json
Parsing configuration file: krakend.json
Syntax OK!Debug enabled
Checking the configuration with the debug flag
$krakend check -c krakend.json -d
Parsing configuration file: krakend.json
Parsed configuration: CacheTTL: 1h0m0s, Port: 8080
Hosts: []
Extra (1):
github_com/devopsfaith/krakend-gologging: map[level:ERROR syslog:false stdout:true prefix:[KRAKEND]]
Endpoints (3):
Endpoint: /supu, Method: GET, CacheTTL: 1h0m0s, Concurrent: 1, QueryString: []
Extra (0):
Backends (1):
URL: /__debug/supu, Method: GET
Timeout: 3s, Target: , Mapping: map[], BL: [], WL: [], Group:
Hosts: [http://127.0.0.1:8080]
Extra (2):
github.com/devopsfaith/krakend-martian: map[fifo.Group:map[scope:[request response] aggregateErrors:true modifiers:[map[header.Modifier:map[value:ouh yeah! scope:[request response] name:X-Martian]] map[body.Modifier:map[scope:[request] contentType:application/json body:eyJtc2ciOiJ5b3Ugcm9jayEifQ==]] map[header.RegexFilter:map[header:X-Neptunian regex:no! modifier:map[header.Modifier:map[scope:[request] name:X-Martian-New value:some value]] scope:[request]]]]]]
github.com/devopsfaith/krakend-circuitbreaker/gobreaker: map[timeout:10 maxErrors:1 interval:60]
Endpoint: /github/:user, Method: GET, CacheTTL: 1h0m0s, Concurrent: 1, QueryString: []
Extra (0):
Backends (1):
URL: /, Method: GET
Timeout: 3s, Target: , Mapping: map[], BL: [], WL: [authorizations_url code_search_url], Group:
Hosts: [https://api.github.com]
Extra (3):
github.com/devopsfaith/krakend-martian: map[fifo.Group:map[modifiers:[map[header.Modifier:map[name:X-Martian value:ouh yeah! scope:[request response]]] map[body.Modifier:map[scope:[request] contentType:application/json body:eyJtc2ciOiJ5b3Ugcm9jayEifQ==]] map[header.RegexFilter:map[scope:[request] header:X-Neptunian regex:no! modifier:map[header.Modifier:map[scope:[request] name:X-Martian-New value:some value]]]]] scope:[request response] aggregateErrors:true]]
github.com/devopsfaith/krakend-ratelimit/juju/proxy: map[maxRate:2 capacity:2]
github.com/devopsfaith/krakend-circuitbreaker/gobreaker: map[interval:60 timeout:10 maxErrors:1]
Endpoint: /show/:id, Method: GET, CacheTTL: 1h0m0s, Concurrent: 1, QueryString: []
Extra (1):
github.com/devopsfaith/krakend-ratelimit/juju/router: map[maxRate:50 clientMaxRate:5 strategy:ip]
Backends (2):
URL: /user/schedule/{{.Id}}.rss, Method: GET
Timeout: 3s, Target: , Mapping: map[], BL: [], WL: [items title], Group: schedule
Hosts: [http://showrss.info]
Extra (2):
github.com/devopsfaith/krakend-circuitbreaker/gobreaker: map[interval:60 timeout:10 maxErrors:1]
github.com/devopsfaith/krakend-ratelimit/juju/proxy: map[maxRate:1 capacity:1]
URL: /user/{{.Id}}.rss, Method: GET
Timeout: 3s, Target: , Mapping: map[], BL: [], WL: [items title], Group: available
Hosts: [http://showrss.info]
Extra (2):
github.com/devopsfaith/krakend-ratelimit/juju/proxy: map[maxRate:2 capacity:2]
github.com/devopsfaith/krakend-circuitbreaker/gobreaker: map[interval:60 timeout:10 maxErrors:1]
Syntax OK!Check conflicting routes
Even the configuration is valid from a syntax perspective, you can have a failing KrakenD once the service starts. To avoid this situation, the -t flag will actually start a KrakenD instance and test the routes.
When automating the checks of the configuration, make sure to add the -t flag:
krakend check -t -d -c config.json
Make sure that the port of KrakenD is not allocated in your pipeline. You can always change it with environment vars.
