Connections

Connections are an easy way to authenticate against sources. It can be created via a CRD or by adding it in the settings page

A sample connection CRD looks like:

apiVersion: mission-control.flanksource.com/v1
kind: Connection
metadata:
  name: payments-database
spec:
  type: postgres
  url:
    value: 'postgres://$(username):$(password)@postgres.host.com/payments'
  username:
    valueFrom:
      secretKeyRef:
        name: payments-database-credentials
        key: POSTGRES_USER
  password:
    valueFrom:
      secretKeyRef:
        name: payments-database-credentials
        key: POSTGRES_PASSWORD

Eventually, the URL that gets templated is used for establishing connections. This can be used for any datasource that authenticates via URL (PostgreSQL, MySQL, MSSQL, Redis, Opensearch, Elasticsearch etc.)

A connection string can be represented in the form of type/connection_name or type/namespace/connection_name

It can then be used in Health Checks via connection attribute or during Topology creation in component.lookup


apiVersion: canaries.flanksource.com/v1
kind: Canary
metadata:
  name: postgres-check
spec:
  postgres:
    - name: postgres schemas check
      connection: connection://postgres/payments-database
      query: SELECT COUNT(*) FROM payments where state = 'pending'

This allows us a safe and reusable way to handle authentication

tip

If the entire URL is in the secrets and cannot be constructed like scheme://$(username):$(password)@<host>:<port> you can fetch that directly like

kind: Connection
metadata:
  name: opensearch-global
spec:
  type: opensearch
  url:
    value: $(password)
  password:
    valueFrom:
      secretKeyRef:
        name: opensearch-credentials
        key: OPENSEARCH_URL

Schema

Field	Description	Scheme	Required
url	URL in templatable form	EnvVar	yes
port	Port number	EnvVar
type	Type of datasource (postgres,mysql,elasticsearch ...)	string
username	Username	EnvVar
password	Password	EnvVar
certificate	Certificate for verification	EnvVar
properties	Property fields	map[string]string
insecure_tls	Allow insecure tls	bool

Schema​

Schema