KubeMQ Sources

KubeMQ Sources connects external systems and cloud services with KubeMQ message queue broker.

KubeMQ Sources allows us to build a message-based microservices architecture on Kubernetes with minimal efforts and without developing connectivity interfaces between external system such as messaging components (RabbitMQ, Kafka, MQTT) ,REST APIs and KubeMQ message queue broker. In addition, KubeMQ Sources allows migrating legacy systems (together with KubeMQ Targets) to KubeMQ based messaging architecture.

Key Features:

• Runs anywhere - Kubernetes, Cloud, on-prem, anywhere

• Stand-alone - small docker container / binary

• Single Interface - One interface all the services

• API Gateway - Act as an REST Api gateway

• Plug-in Architecture Easy to extend, easy to connect

• Middleware Supports - Logs, Metrics, Retries, and Rate Limiters

• Easy Configuration - simple yaml file builds your topology

Concepts

KubeMQ Sources building blocks are:

• Binding

• Source

• Target

Binding

Binding is a 1:1 connection between Source and Target. Every Binding runs independently.

binding

Source

Source is an external service that provide ingress data to KubeMQ's channels which then later consumed by services connected to KubeMQ server.

Source can be services such HTTP REST Api, Messaging systems (RabbitMQ, Kafka, MQTT etc).

KubeMQ Sources integrate each one of the supported sources and ingest data into KubeMQ via Targets.

Target

The target is a KubeMQ connection which send the data from the sources and route them to the appropriate KubeMQ channel for action, and return back a response if needed.

Middlewares

In bindings configuration, KubeMQ Bridges supports middleware setting for each pair of source and target bindings.

These properties contain middleware information settings as follows:

Logs Middleware

KubeMQ Bridges supports level based logging to console according to as follows:

Property	Description	Possible Values
log_level	log level setting	"debug","info","error"
		"" - indicate no logging on this bindings

An example for only error level log to console:

bindings:
  - name: sample-binding 
    properties: 
      log_level: error
    sources:
    ......

Retry Middleware

KubeMQ Bridges supports Retries' target execution before reporting of error back to the source on failed execution.

Retry middleware settings values:

Property	Description	Possible Values
retry_attempts	how many retries before giving up on target execution	default - 1, or any int number
retry_delay_milliseconds	how long to wait between retries in milliseconds	default - 100ms or any int number
retry_max_jitter_milliseconds	max delay jitter between retries	default - 100ms or any int number
retry_delay_type	type of retry delay	"back-off" - delay increase on each attempt
		"fixed" - fixed time delay
		"random" - random time delay

An example for 3 retries with back-off strategy:

bindings:
  - name: sample-binding 
    properties: 
      retry_attempts: 3
      retry_delay_milliseconds: 1000
      retry_max_jitter_milliseconds: 100
      retry_delay_type: "back-off"
    sources:
    ......

Rate Limiter Middleware

KubeMQ Sources support a Rate Limiting of target executions.

Rate Limiter middleware settings values:

Property	Description	Possible Values
rate_per_second	how many executions per second will be allowed	0 - no limitation
		1 - n integer times per second

An example for 100 executions per second:

bindings:
  - name: sample-binding 
    properties: 
      rate_per_second: 100
    source:
    ......