SQL

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

apiVersion: canaries.flanksource.com/v1
kind: Canary
metadata:
  name: postgres-check
spec:
  interval: 30
  postgres: # or mysql, mssql
    - name: postgres schemas check
      url: "postgres://$(username):$(password)@postgres.default.svc:5432/postgres?sslmode=disable"
      username:
        valueFrom:
          secretKeyRef:
            name: postgres-credentials
            key: USERNAME
      password:
        valueFrom:
          secretKeyRef:
            name: postgres-credentials
            key: PASSWORD
      query: SELECT current_schemas(true)
      display:
        template: |
          {{- range $r := .results.rows }}
          {{- $r.current_schemas}}
          {{- end}}
      results: 1

Field	Description	Scheme
name*	Name of the check, must be unique within the canary	string
query*	Query to execute against the Postgres database	SQL
results	Number of expected rows in results	int
description	Description for the check	string
display	Expression to change the formatting of the display	Expression
icon	Icon for overwriting default icon on the dashboard	Icon
labels	Labels for check	map[string]string
metrics	Metrics to export from	[]Metrics
test	Evaluate whether a check is healthy	Expression
transform	Transform data from a check into multiple individual checks	Expression
connection	The connection to use, mutually exclusive with username and password	Connection
url	If connection is specified and it also includes a url, this field will take precedence	string
username		EnvVar
password		EnvVar

Result Variables

Name	Description	Scheme
rows		[]map[string]interface
count	Number of rows returned	int

SQL Server

# ...
kind: Canary
spec:
  mssql:
   - url: "server=mssql.default.svc;user id=$(username);password=$(password);port=1433;database=master"
      # ...

MySQL

# ...
kind: Canary
spec:
  mysql:
    - url: "$(username):$(password)@tcp(mysql.default.svc:3306)/mysqldb"
    # ...

Postgres

# ...
kind: Canary
spec:
   mysql:
    - url: "postgres://$(username):$(password)@postgres.default.svc:5432/postgres?sslmode=disable"
        # ...