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Kubernetes operator for executing synthetic tests

- Introduction - Features - Comparisons - Quick Start - Check Types - DNS - Query a DNS server - Containerd Pull - Pull an image using containerd - Docker Pull - Pull an image using docker - Docker Push - Create and push a docker image - HTTP - Query an HTTP endpoint or namespace - displayTemplate - Helm - Build and push a helm chart - ICMP - Ping a destination and check for packet loss - LDAP - Query a ldap(s) server - Namespace - Create a new kubernetes namespace and pod - Pod - Create a new pod and verify reachability - Postgres - Query a Postgresql DB using SQL - displayTemplate - Mssql - Query a Mssql DB using SQL - displayTemplate - Elasticsearch - Query an Elasticsearch DB - Redis - Execute ping against redis instance - S3 - Verify reachability and correctness of an S3 compatible store - Folder Check - S3 Bucket - Query the contents of an S3 bucket for freshness - GCS Bucket - Query the contents of an GCS bucket for freshness - Smb - Verify Folder Freshness - server - Restic - Query the contents of a Restic repository for backup freshness and integrity - Jmeter - Run the supplied JMX test plan against the specified host - SSL - Verify the expiry date of a SSL cert - Exec - Execute commands or script on the host - TCP - Junit - displayTemplate - displayTemplate - Display Types - displayTemplate - Guide for Developers

Introduction

Canary Checker is a Kubernetes native multi-tenant synthetic monitoring system. To learn more, please see the official documentation.

Features

Built-in UI/Dashboard with multi-cluster aggregation
CRD based configuration and status reporting
Prometheus Integration
Runnable as a CLI for once-off checks or as a standalone server outside kubernetes
Many built-in check types

dashboard

Comparisons

App	Comparison
Prometheus	canary-checker is not a replacement for prometheus, rather a companion. While prometheus provides persistent time series storage, canary-checker only has a small in-memory cache of recent checks. Canary-checker also exposes metrics via `/metrics` that are scraped by prometheus.
Grafana	The built-in UI provides a mechanism to display check results across 1 or more instances without a dependency on grafana/prometheus running. The UI will also display long-term graphs of check results by quering prometheus.
Kuberhealthy	Very similar goals, but Kuberhealthy relies on external containers to implement checks and does not provide a UI or multi-cluster/instance aggregation.
Cloudprober	Very similar goals, but Cloudprober is designed for very high scale, not multi-tenancy. Only has ICMP,DNS,HTTP,UDP built-in checks.

Quick Start

Before installing the Canary Checker, please ensure you have the prerequisites installed on your Kubernetes cluster.

# install the operator
kubectl apply -f https://github.com/flanksource/canary-checker/releases/download/v0.38.154/release.yaml
# deploy a sample canary
kubectl apply -f https://raw.githubusercontent.com/flanksource/canary-checker/master/fixtures-crd/http_pass.yaml
# check the results of the canary
kubectl get canary

sample output

NAMESPACE         NAME   INTERVAL   STATUS   MESSAGE   UPTIME 1H      LATENCY 1H   LAST TRANSITIONED   LAST CHECK
platform-system   dns    30         Passed             0/2 (0%)                                        6s
platform-system   lan    30         Passed             12/12 (100%)   1033         139m                6s
platform-system   ldap   30         Passed             5/5 (100%)     323                              1s
platform-system   pod    120        Passed             1/2 (50%)      10904        45m                 24s
platform-system   s3     30         Passed             5/5 (100%)     1091         5m35s               5s

http_pass.yaml

apiVersion: canaries.flanksource.com/v1
kind: Canary
metadata:
  name: http-pass
spec:
  interval: 30
  http:
    - endpoint: https://httpstat.us/200
      thresholdMillis: 3000
      responseCodes: [201, 200, 301]
      responseContent: ""
      maxSSLExpiry: 7

Check Types

DNS - Query a DNS server

dns:
  - server: 8.8.8.8
    port: 53
    query: "flanksource.com"
    querytype: "A"
    minrecords: 1
    exactreply: ["34.65.228.161"]
    timeout: 10

Field	Description	Scheme	Required
description	Description of check	string	Yes
server	Address of DNS server to query	string	Yes
port	Port to query DNS server on	int	Yes
query	Domain name to lookup	string
querytype	Record type to query	string	Yes
minrecords	Minimum records	int
exactreply	Expected exact match result(s)	[]string
timeout	Maximum timeout for DNS query	int	Yes
thresholdMillis	Threshold response time from DNS server	int	Yes

Containerd Pull - Pull an image using containerd

This check will try to pull a Docker image from specified registry using containerd and then verify its checksum and size.

containerdPull:
  - image: docker.io/library/busybox:1.31.1
    username:
    password:
    expectedDigest: 6915be4043561d64e0ab0f8f098dc2ac48e077fe23f488ac24b665166898115a
    expectedSize: 1219782

Field	Description	Scheme	Required
description	Description of check	string	Yes
image	Full path to image, including registry	string	Yes
auth	Username and password value, configMapKeyRef or SecretKeyRef for registry	Object	No
expectedDigest	Expected digest of the pulled image	string	Yes
expectedSize	Expected size of the pulled image	int64	Yes

Docker Pull - Pull an image using docker

This check will try to pull a Docker image from specified registry, verify it's checksum and size.

docker:
  - image: docker.io/library/busybox:1.31.1
    auth:
      username:
        value: some-user
      password:
        value: some-password
    expectedDigest: 6915be4043561d64e0ab0f8f098dc2ac48e077fe23f488ac24b665166898115a
    expectedSize: 1219782

Field	Description	Scheme	Required
description	Description of check	string	Yes
image	Full path to image, including registry	string	Yes
auth	Username and password value, configMapKeyRef or SecretKeyRef for registry	Object	No
expectedDigest	Expected digest of the pulled image	string	Yes
expectedSize	Expected size of the pulled image	int64	Yes

HTTP - Query an HTTP endpoint or namespace

http:
  - endpoint: https://httpstat.us/200
    thresholdMillis: 3000
    responseCodes: [201,200,301]
    responseContent: ""
    maxSSLExpiry: 60
    displayTemplate: 'Response Code: [[.code]] Content: [[.content]]; Headers: [[.headers]]'
  - endpoint: https://httpstat.us/500
    thresholdMillis: 3000
    responseCodes: [500]
    responseContent: ""
    maxSSLExpiry: 60
  - endpoint: https://httpstat.us/500
    thresholdMillis: 3000
    responseCodes: [302]
    responseContent: ""
    maxSSLExpiry: 60
  - namespace: k8s-https-namespace
    thresholdMillis: 3000
    responseCodes: [200]
    responseContent: ""
    maxSSLExpiry: 60
    displayTemplate: 'Response Code: [[.code]]'
  - headers:
    - name: headerkey1
      value: headervalue1
    - name: headerkey2
      valueFrom:
        configMapRef:
          key: headervalue2
          name: header-configmap
    responseJSONContent:
      path: "$.headerkey1[0]"
      value: headervalue1
    endpoint: http://podinfo.127.0.0.1.nip.io/headers
    responseCodes:
      - 200
  - method: POST
    body: bodycontent
    responseContent: bodycontent
    endpoint: http://podinfo.127.0.0.1.nip.io/echo
    displayTemplate: 'Response Code: [[.code]] Content: [[.content]]; Headers: [[.headers]]'
    responseCodes:
      - 202
  - authentication:
      username:
        value: user
      password:
        valueFrom:
          secretKeyRef:
            name: authentication-secret
            key: password
    responsecodes:
      - 202
    endpoint: https://testloginserver.127.0.0.1.nip.io/login

Field	Description	Scheme	Required
description		string	Yes
endpoint	HTTP endpoint to monitor	string	Yes ^*
namespace	kubernetes namespace to monitor	string	Yes ^*
thresholdMillis	maximum duration in milliseconds for the HTTP request. It will fail the check if it takes longer.	int	Yes
responseCodes	expected response codes for the HTTP Request.	[]int	Yes
responseContent	exact response content expected to be returned by the endpoint.	string	Yes
responseJSONContent	`path` and `value` to parse json responses. `path` is a jsonpath string, `value` is the expected content at that path	JSONCheck
maxSSLExpiry	maximum number of days until the SSL Certificate expires.	int	Yes
method	specify GET (default) or POST method for HTTP call	string
body	body of HTTP method	string
headers	array of key-value pairs to be passed as headers to the HTTP method. Specified in the same manner as pod environment variables but without the support for pod spec references	[]kommons.EnvVar
authentication	`username` and `password` value, both of which are specified as []kommons.EnvVar, to be passed as authentication headers	*Authentication
ntlm	if true, will change authentication protocol	bool
displayTemplate	template to display server response in text (overrides default bar format for UI)	string	No

^* One of either endpoint or namespace must be specified, but not both. Specify a namespace of "*" to crawl all namespaces.

displayTemplate

The fields for displayTemplate (see Display Types) are :

.code: response code from the http server
.headers: response headers
.content: content from the http request

ICMP - Ping a destination and check for packet loss

This test will check ICMP packet loss and duration.

icmp:
  - endpoints:
      - https://google.com
      - https://yahoo.com
    thresholdMillis: 400
    packetLossThreshold: 50
    packetCount: 2

Field	Description	Scheme	Required
description	Description of check	string	Yes
endpoint	Address to query using ICMP	string	Yes
thresholdMillis	Expected response time threshold in ms	int64	Yes
packetLossThreshold	Percent of total packets that are allowed to be lost	int64	Yes
packetCount	Total number of packets to send per check	int	Yes

LDAP - Query a ldap(s) server

The LDAP check will:

bind using provided user/password to the ldap host. Supports ldap/ldaps protocols.
search an object type in the provided bind DN.s

ldap:
  - host: ldap://127.0.0.1:10389
    auth:
      username:
        value: uid=admin,ou=system
      password:
        value: secret
    bindDN: ou=users,dc=example,dc=com
    userSearch: "(&(objectClass=organizationalPerson))"
  - host: ldap://127.0.0.1:10389
    auth:
      username:
        value: uid=admin,ou=system
      password:
        value: secret
    bindDN: ou=groups,dc=example,dc=com
    userSearch: "(&(objectClass=groupOfNames))"

Field	Description	Scheme	Required
description	Description of check	string	Yes
host	URL of LDAP server to be qeuried	string	Yes
auth	username and password value, configMapKeyRef or SecretKeyRef for LDAP server	Object	Yes
bindDN	BindDN to use in query	string	Yes
userSearch	UserSearch to use in query	string	Yes
skipTLSVerify	Skip check of LDAP server TLS certificates	bool	Yes

Namespace - Create a new kubernetes namespace and pod

The namespace check will:

Create a new namespace using the labels/annotations provided
Create a new pod in the namespace using the provided PodSpec
Expose the pod using the provided ingress URL
Test an HTTP connection to the pod

namespace:
  - namePrefix: "test-name-prefix-"
    labels:
      team: test
    annotations:
      "foo.baz.com/foo": "bar"

Field	Description	Scheme	Required
description	Description of check	string	Yes
namespaceNamePrefix	Prefix string to identity namespace	string	Yes
namespaceLabels	Metadata labels to apply to created namespace	map[string]string	Yes
namespaceAnnotations	Metadata annotations to apply to created namespace	map[string]string	Yes
podSpec	Spec of pod to be created in check namespace	string	Yes
scheduleTimeout	Maximum time between pod created and pod running	int64	Yes
readyTimeout		int64	Yes
httpTimeout	Maximum time to wait for an HTTP connection to the created pod	int64	Yes
deleteTimeout		int64	Yes
ingressTimeout	Maximum time to create an ingress connected to the pod	int64	Yes
httpRetryInterval	Interval in ms to retry HTTP connections to the created pod	int64	Yes
deadline	Overall time before which an HTTP connection to the pod must be established	int64	Yes
port	Port on which the created pod will serve traffic	int64	Yes
path	Path on whcih the created pod will respond to requests	string	Yes
ingressName	Name to use for the ingress object that will expose the created pod	string	Yes
ingressHost	URL to be used by the ingress to expose the created pod	string	Yes
expectedContent	Expected content of an HTTP response from the created pod	string	Yes
expectedHttpStatuses	Expected HTTP status code of the response from the created pod	[]int64	Yes
priorityClass	Pod priority class	string	Yes

Pod - Create a new pod and verify reachability

pod:
  - name: golang
    namespace: default
    spec: |
      apiVersion: v1
      kind: Pod
      metadata:
        name: hello-world-golang
        namespace: default
        labels:
          app: hello-world-golang
      spec:
        containers:
          - name: hello
            image: quay.io/toni0/hello-webserver-golang:latest
    port: 8080
    path: /foo/bar
    ingressName: hello-world-golang
    ingressHost: "hello-world-golang.127.0.0.1.nip.io"
    scheduleTimeout: 2000
    readyTimeout: 5000
    httpTimeout: 2000
    deleteTimeout: 12000
    ingressTimeout: 5000
    deadline: 29000
    httpRetryInterval: 200
    expectedContent: bar
    expectedHttpStatuses: [200, 201, 202]

Field	Description	Scheme	Required
description	Description of the check	string	Yes
name	Name of the pod to be created	string	Yes
namespace	Namespace to create the pod in	string	Yes
spec	Spec of pod to be created	string	Yes
scheduleTimeout	Maximum time between pod created and pod running	int64	Yes
readyTimeout		int64	Yes
httpTimeout	Maximum time to wait for an HTTP connection to the created pod	int64	Yes
deleteTimeout		int64	Yes
ingressTimeout	Maximum time to create an ingress connected to the pod	int64	Yes
httpRetryInterval	Interval in ms to retry HTTP connections to the created pod	int64	Yes
deadline	Overall time before which an HTTP connection to the pod must be established	int64	Yes
port	Port on which the created pod will serve traffic	int64	Yes
path	Path on whcih the created pod will respond to requests	string	Yes
ingressName	Name to use for the ingress object that will expose the created pod	string	Yes
ingressHost	URL to be used by the ingress to expose the created pod	string	Yes
expectedContent	Expected content of an HTTP response from the created pod	string	Yes
expectedHttpStatuses	Expected HTTP status code of the response from the created pod	[]int64	Yes
priorityClass	Pod priority class	string	Yes

Postgres - Query a Postgresql DB using SQL

This check will try to connect to a specified Postgresql database, run a query against it and verify the results.

postgres:
  - connection: "user=postgres password=mysecretpassword host=192.168.0.103 port=15432 dbname=postgres sslmode=disable"
    query: "SELECT * from names"
    resultsFunction: '[[ if index .results 0 "surname" | eq "khandelwal" ]]true[[else]]false[[end]]'
    displayTemplate: '[[ index .results 0 ]]'

Field	Description	Scheme	Required
description	description for the test	string	No
connection	connection string to connect to the server	string	Yes
query	query that needs to be executed on the server	string	Yes
resultsFunction	function that tests query output for pass/fail (must return boolean)	string	No
displayTemplate	template to display query results in text (overrides default bar format for UI)	string	No

displayTemplate

The fields for displayTemplate are:

.results: rows returned by the query

Mssql - Query a Mssql DB using SQL

This check will try to connect to a specified Mssql database, run a query against it and verify the results.

mssql:
  - connection: 'server=localhost;user id=sa;password=S0m3S3curep@sswd;port=1433;database=master'
    description: 'The mssql test'
    query: "SELECT * from names"
    resultsFunction: '[[ if index .results 0 "surname" | eq "khandelwal" ]]true[[else]]false[[end]]'
    displayTemplate: '[[ index .results 0 ]]'

Field	Description	Scheme	Required
description	description for the test	string	No
connection	connection string to connect to the server	string	Yes
query	query that needs to be executed on the server	string	Yes
resultsFunction	function that tests query output for pass/fail (must return boolean)	string	No
displayTemplate	template to display query results in text (overrides default bar format for UI)	string	No

displayTemplate

The fields for displayTemplate (see Display Types) are:

.results: rows returned by the query

Redis - Execute ping against redis instance

This check will execute ping against the specified redis instance and check its availability

redis:
  - addr: 'localhost:6379'
    description: 'The redis test'
    db: 0

Field	Description	Scheme	Required
addr	host:port address.	string	Yes
db	database to be selected after connecting to the server.	int	Yes
description	description for canary	string	No
auth	username and password value, configMapKeyRef or SecretKeyRef for redis server	Object	No

Elasticsearch - Query an Elasticsearch DB

This check will try to connect to a specified Elasticsearch database, run a query against it and verify the results.

elasticsearch:
  - url: http://elasticsearch-host.example.com:9200
    description: elasticsearch checker
    index: index_name
    query: |
      {
        "query": {
          "term": {
            "system.role": "api"
          }
        }
      }
    results: 3

Field	Description	Scheme	Required
url	host:port address.	string	Yes
description	description for the test	string	No
index	index against which query should be ran	string	Yes
query	query that needs to be executed on the server	string	Yes
results	number of expected hits	int	Yes
auth	username and password value, configMapKeyRef or SecretKeyRef for elasticsearch server	Object	No

S3 - Verify reachability and correctness of an S3 compatible store

This check will:

list objects in the bucket to check for Read permissions
PUT an object into the bucket for Write permissions
download previous uploaded object to check for Get permissions

s3:
  - buckets:
      - name: "test-bucket"
        region: "us-east-1"
        endpoint: "https://test-bucket.s3.us-east-1.amazonaws.com"
    secretKey: "<access-key>"
    accessKey: "<secret-key>"
    objectPath: "path/to/object"

Field	Description	Scheme	Required
description	Description for the check	string	Yes
bucket	Array of Bucket objects to be checked	Bucket	Yes
accessKey	AWS access Key to access Bucket	string	Yes
secretKey	AWS secret Key to access Bucket	string	Yes
objectPath	Path of object in bucket to	string	Yes
skipTLSVerify	skip TLS verify when connecting to s3	bool	Yes

Folder Check

Folder Check provides an abstraction over checker related to folder. Currently, used to perform the following checks:

Field	Description	Scheme	Required
description	Description of check	string	No
name	name for the check	string	No
Icon	custom icon to display on the UI	string	No
Test	Template to test the result against	Object	No
Display	Template to display the result in	Object	No
Path	Path to the object, needs to be prefixed with the protocol. See example below	string	Yes
SMBConnection		Object	No
AWSConnection		Object	No
GCPConnection		Object	No
Filter	Used to filter the objects	Object	No
FolderTest	Parameters to test the folder against	Object	No

S3 Bucket - Query the contents of an S3 bucket for freshness

This check will:

search objects matching the provided object path pattern
check that latest object is no older than provided maxAge value in seconds
check that latest object size is not smaller than provided minSize value in bytes

For working with folder check, the bucket name needs to be prefixed with s3://

folder:
    # Check for any backup not older than 7 days and min size 25 bytes
    - path: s3://refactoringtest-tarun
      awsConnection:
        accessKey:
          valueFrom:
            secretKeyRef:
              key: access-key
              name: aws
        secretKey:
          valueFrom:
            secretKeyRef:
              key: secret-key
              name: aws
        region: "ap-south-1"
      maxAge: 7d
      maxSize: 25b

GCS Bucket - Query the contents of an GCS bucket for freshness

This check will:

search objects matching the provided object path pattern
check that latest object is no older than provided maxAge value in seconds
check that latest object size is not smaller than provided minSize value in bytes

For working with folder check, the bucket name needs to be prefixed with gcs://

folder:
   - description: gcs auth test
     path: gcs://somegcsbucket
     gcpConnection:
       credentials:
        valueFrom:
         configMapKeyRef:
           key: canary-checker-df017acc453c.json
           name: sa
     minAge: 1m
     maxAge: 5h
     minSize: 2M
     maxCount: 2
     minCount: 5

Smb - Verify Folder Freshness

This check connects to a samba server to check folder freshness. This check will:

verify most recently modified file fulfills the minAge and maxAge constraints (each an optional bound)
verify files present in the mount is more than minCount

folder:
  - server: smb://192.168.1.9
    smbConnection:
      auth:
        username: 
          value: samba
        password:
          valueFrom:
            secretKeyRef:
              key: smb-password
              name: smb
      sharename: "Some Public Folder"
      searchPath: a/b/c
    minAge: 10h
    maxAge: 20h
    description: "Success SMB server"

Or with server in path format:

folder:
   - server: '\\192.168.1.5\Some Public Folder\somedir'
     smbConnection:
       auth:
         username: 
          value: samba
         password: 
          value: password
       sharename: "sharename" #will be overwritten by 'Some Public Folder'
       searchPath: a/b/c #will be overwritten by 'somedir'
     minAge: 10h
     maxAge: 100h
     description: "Success SMB server"

server

The user can define server in two formats:

host: 192.168.1.9, www.server.com
path: \\www.server.com\e$\a\b\c

For path format:

www.server.com is the host
e$ is the sharename (overrides sharename field)
a/b/c the sub-dir relative to mount representing the test root (overrides searchPath field)

Restic - Query the contents of a Restic repository for backup freshness and integrity

This check will:

query a Restic Repository for contents
check the integrity and consistency of repo and data-blobs
check bakup freshness

restic:
    - repository: s3:http://minio.infra/restic-repo
      password: 
        value: S0M3p@sswd
      maxAge: 5h30m
      checkIntegrity: true
      accessKey: 
        value: some-access-key
      secretKey: 
        value: some-secret-key
      description: The restic test

Field	Description	Scheme	Required
reposiory	the location of your restic repository	string	Yes
password	password value or valueFrom configMapKeyRef or SecretKeyRef to access your restic repository	string	Yes
maxAge	the max age for backup allowed..eg: 5h30m	string	Yes
accessKey	access key value or valueFrom configMapKeyRef or SecretKeyRef to access your s3/minio bucket	string	No
secretkey	secret key value or valueFrom configMapKeyRef or SecretKeyRef to access your s3/minio bucket	string	No
description	the description about the canary	string	Yes
checkIntegrity	whether to check integrity for the specified repo	bool	No
caCert	path to ca-root crt in case of self-signed certificates is used	string	No

Jmeter - Run the supplied JMX test plan against the specified host

This check will execute the jmeter cli to execute the JMX test plan on the specified host.

Note: JMeter is a memory hungry Java application and you will likely need to increase the default memory limit from 512Mi to 1-2Gi or higher depending on the complexity, count, and frequency of jmeter tests

jmeter:
    - jmx:
        name: jmx-test-plan
        valueFrom:
          configMapKeyRef:
             key: jmeter-test.xml
             name: jmeter
      host: "some-host"
      port: 8080
      properties:
        - remote_hosts=127.0.0.1
      systemProperties:
        - user.dir=/home/mstover/jmeter_stuff
      description: "The Jmeter test"

Field	Description	Scheme	Required
jmx	configmap or Secret reference to get the JMX test plan	Object	Yes
host	the server against which test plan needs to be executed	String	No
port	the port on which the server is running	Int	No
properties	defines the local Jmeter properties	[]String	No
systemProperties	defines the java system property	[]String	No
description	the description of the canary	String	Yes
responseDuration	the duration under which all the test should pass	String	No

SSL - Verify the expiry date of a SSL cert

Field	Description	Scheme	Required
description	Description of check	string	Yes
endpoint	HTTP endpoint to crawl	string	Yes
maxSSLExpiry	maximum number of days until the SSL Certificate expires.	int	Yes

Exec - Execute commands or script on the host

Field	Description	Scheme	Required
script	Inline commands or Absolute path to the script that needs to be executed	Yes
description	description for the check	string	No
display	format on how the result is going to be displayed on the console	Template	No
test	test against which result needs to be verified	Template	No

TCP

Field	Description	Scheme	Required
description	Description of cGit heck	string	Yes
endpoint	Endpoint to establish a TCP connection with	string	Yes
thresholdMillis	Maximum time in ms to wait for connection to be established	int64	Yes

Junit

The check occurs on the specified container's completion and parses any junit test reports in the container (at the testResults path):

junit:
  - testResults: "/tmp/junit-results/"
    description: "junit demo test"
    displayTemplate: 'Passed: [[.passed]]; Failed: [[.failed]]; Skipped: [[.skipped]]; Error: [[.error]]'
    spec:
      containers:
        - name: jes
          image: docker.io/tarun18/junit-test-pass
          command: ["/start.sh"]

Field	Description	Scheme	Required
testResults	directory where the results will be published	string	Yes
description	description about the test	string	No
spec	pod specification	corev1.PodSpec	Yes
displayTemplate	template to display testResults results in text (default: `Passed: [[.passed]], Failed: [[.failed]]`)	string	No

Note: For this corev1.PodSpec implementation, only containers field is required.

displayTemplate

The fields for displayTemplate (see Display Types) are:

.passed: number of tests passed
.failed: number of tests failed
.skipped: number of tests skipped
.error: number of tests errored

displayTemplate

The fields for displayTemplate (see Display Types) are:

.age: age of most recently modified file
.count: number of files present in the mount