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Top 50 traefik Interview Questions & Answer

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Traefik interview questions and answers

1) What is Traefik software?

Traefik (pronounced traffic) is a modern HTTP reverse proxy and load balancer that makes deploying microservices easy. Traefik integrates with your existing infrastructure components (Docker, Swarm mode, Kubernetes, Marathon, Consul, Etcd, Rancher, Amazon ECS, …) and configures itself automatically and dynamically.

2) What are use cases of Traefik?

The main use case for Traefik in this scenario is to distribute incoming HTTP(S) and TCP requests from the Internet to front-end services that can handle these requests.

3) Is Traefik a web server?

nginx and Traefik are primarily classified as “Web Servers” and “Load Balancer / Reverse Proxy” tools respectively.

4) What is Traefik Linux?

Traefik is one of the modern methods which is used to set up reverse proxy for docker containers. When you want to run multiple applications in docker containers exposing port 80 and 443, traefik can be the best option for reverse proxy. Traefik provides its own monitoring dashboard.

5) Is Traefik a proxy?

Traefik is a modern HTTP reverse proxy and load balancer that makes deploying microservices easy. Traefik integrates with your existing infrastructure components (Docker, Swarm mode, Kubernetes, Marathon, Consul, Etcd, Rancher, Amazon ECS, …) and configures itself automatically and dynamically.

6) Is Traefik an API gateway?

As an API Gateway, Traefik Enterprise provides key capabilities such as API security, traffic management, and observability. Traefik Enterprise enables security policies, adding user authentication and authorization, while also accelerating client requests through caching and traffic shaping.

7) Is Traefik a reverse proxy?

Traefik is a leading modern reverse proxy and load balancer that makes deploying microservices easy. Traefik integrates with your existing infrastructure components and configures itself automatically and dynamically.

8) Is Traefik open source?

Traefik is an open-source Edge Router that makes publishing your services a fun and easy experience. It receives requests on behalf of your system and finds out which components are responsible for handling them.

9) Is Traefik pilot free?

It is now possible for free! The new service was launched in conjunction with the Traefik 2.3 release candidate. Traefik Pilot is a new concept, delivering an entirely new approach to network management in the cloud.

10) Is Traefik a service mesh?

Traefik Mesh is a straight-forward, easy to configure, and non-invasive service mesh that allows visibility and management of the traffic flows inside any Kubernetes cluster.

11) What is AWS Traefik?

From their website; Traefik is a modern HTTP reverse proxy and load balancer made to deploy micro-services with ease. It supports several backends (Docker, Swarm, Kubernetes, Marathon, Mesos, Consul, Etcd, Zookeeper, BoltDB, Rest API, file…) to manage its configuration automatically and dynamically.

12) What is a Traefik provider?

The providers are infrastructure components, whether orchestrators, container engines, cloud providers, or key-value stores. The idea is that Traefik queries the provider APIs in order to find relevant information about routing, and when Traefik detects a change, it dynamically updates the routes.

13) How do I know if my Traefik is running?

Go back to your browser ( http://localhost:8080/api/rawdata ) and see that Traefik has automatically detected the new instance of the container. The output will show alternatively one of the followings: Hostname: a656c8ddca6c IP: 172.27. 0.

14) What is ingress controller in Kubernetes?

An Ingress controller is a specialized load balancer for Kubernetes (and other containerized) environments. Kubernetes is the de facto standard for managing containerized applications.

15) What is Kubernetes service?

A Kubernetes service is a logical abstraction for a deployed group of pods in a cluster (which all perform the same function). Since pods are ephemeral, a service enables a group of pods, which provide specific functions (web services, image processing, etc.) to be assigned a name and unique IP address (clusterIP).

16) What is k8 ingress?

Kubernetes Ingress is an API object that provides routing rules to manage external users’ access to the services in a Kubernetes cluster, typically via HTTPS/HTTP. With Ingress, you can easily set up rules for routing traffic without creating a bunch of Load Balancers or exposing each service on the node.

17) Is Traefik written in Go?

Traefik is written in Golang, which is technically a (depending on your viewpoint) memory-safe language. It has a pretty decent adoption rate, has a reasonable story for being built on battle-tested libraries, and has a pretty good reputation.

18) How do I access my Traefik dashboard?

You can now access the dashboard on the port 8080 of the Traefik instance, at the following URL: http://:8080/dashboard/ (trailing slash is mandatory).

19) What does service mesh do?

A service mesh is a dedicated infrastructure layer that controls service-to-service communication over a network. This method enables separate parts of an application to communicate with each other. Service meshes appear commonly in concert with cloud-based applications, containers and microservices.

20) Does Traefik support gRPC?

Conclusion. We don’t need specific configuration to use gRPC in Traefik, we just need to use h2c protocol, or use HTTPS communications to have HTTP2 with the backend.

21) Is Traefik better than nginx?

Activating simple features with Traefik does not require multiple complex settings as it does with nginx, and the configuration itself tends to be a lot quicker and more concise as well. While nginx settings end up in huge config maps that are hard to read and manage, it’s not an issue with Traefik.

22) Is Traefik faster than nginx?

Traefik is obviously slower than Nginx, but not so much: Traefik can serve 28392 requests/sec and Nginx 33591 requests/sec which gives a ratio of 85%.

23) Which rule has the highest priority in Traefik?

longest length
Priority. To avoid path overlap, routes are sorted, by default, in descending order using rules length. The priority is directly equal to the length of the rule, and so the longest length has the highest priority.

24) What is traefik port?

If a container exposes a single port, then Traefik uses this port for private communication. If a container exposes multiple ports, or does not expose any port, then you must manually specify which port Traefik should use for communication by using the label traefik.

25) How do I setup my traefik Docker?

Step 1 – Install Docker on Ubuntu 18.04. For this guide, we will be using the latest docker version that can be installed from the official docker repository. …
Step 2 – Install Docker Compose. …
Step 3 – Create Custom Docker Network. …
Step 4 – Install and Configure Traefik Reverse Proxy. …
Step 5 – Testing. …
5 Comment(s)

26) What version of Traefik do I have?

Use traefik [command] –help for help on any command. Commands: healthcheck Calls Traefik /ping to check the health of Traefik (the API must be enabled). version Shows the current Traefik version.

27) What is Traefik used for?

Traefik is a Docker-aware reverse proxy that includes its own monitoring dashboard. In this tutorial, you’ll use Traefik to route requests to two different web application containers: a WordPress container and an Adminer container, each talking to a MySQL database.

28) What is Traefik Linux?

Traefik is one of the modern methods which is used to set up reverse proxy for docker containers. When you want to run multiple applications in docker containers exposing port 80 and 443, traefik can be the best option for reverse proxy. Traefik provides its own monitoring dashboard.

29) Can Traefik serve static files?

Traefik doesn’t serve static files (it’s a not a web server it’s a reverse proxy/load balancer). You must use a container, which contains a web server with your files.

30) Is Traefik an API gateway?

As an API Gateway, Traefik Enterprise provides key capabilities such as API security, traffic management, and observability. Traefik Enterprise enables security policies, adding user authentication and authorization, while also accelerating client requests through caching and traffic shaping.

31) What is a Traefik provider?

The providers are infrastructure components, whether orchestrators, container engines, cloud providers, or key-value stores. The idea is that Traefik queries the provider APIs in order to find relevant information about routing, and when Traefik detects a change, it dynamically updates the routes.

32) Can Traefik serve static files?

Traefik doesn’t serve static files (it’s a not a web server it’s a reverse proxy/load balancer). You must use a container, which contains a web server with your files.

33) What is Traefik ingress controller?

Traefik & Kubernetes. … The Traefik Kubernetes Ingress provider is a Kubernetes Ingress controller; that is to say, it manages access to cluster services by supporting the Ingress specification.

34) What is Ingressroute?

IngressRoutes are custom resources that are defined by the Traefik team, and expose more complex functionality that Traefik can provide. If you are happy with your ingress objects, you can continue to use them, and use annotations and secrets to manage the certificates: (Kubernetes Ingress – Traefik).

35) What is load balancer?

A load balancer is a device that acts as a reverse proxy and distributes network or application traffic across a number of servers. Load balancers are used to increase capacity (concurrent users) and reliability of applications.

36) What is KUBE-proxy?

kube-proxy is a network proxy that runs on each node in your cluster, implementing part of the Kubernetes Service concept. kube-proxy maintains network rules on nodes. These network rules allow network communication to your Pods from network sessions inside or outside of your cluster.

37) What is bare metal Kubernetes?

Bare metal Kubernetes is a powerful set of technologies that builds on the best ideas behind the public and private cloud, yet abstracts away some toilsome aspects related to virtualisation management and networking.

38) What are F5 devices?

F5 BIG-IP Software. A blend of software and hardware that’s a load balancer and a full proxy. It gives you the ability to control the traffic that passes through your network.

39) What is F5 LTM?

F5® BIG-IP® Local Traffic Manager™ (LTM) helps you deliver applications to your users in a reliable, secure, and optimized way. You get the extensibility and flexibility of application services with the programmability you need to manage your physical, virtual, and cloud infrastructure.

40) Why is it called F5?

Kara explains that F5’s name is a reference to a famous movie. “It came from the movie Twister. A category five was the most stormy of the twisters in the movie and then it gave birth to F5.

41) What is GTM and LTM?

The Local Traffic Managers (LTM) and Enterprise Load Balancers (ELB) provide load balancing services between two or more servers/applications in the event of a local system failure. Global Traffic Managers (GTM) provide load balancing services between two or more sites or geographic locations.

42) What is key difference between LTM and GTM in F5?

The biggest difference between the GTM and LTM is traffic doesn’t actually flow through the GTM to your servers. The GTM is an intelligent name resolver, intelligently resolving names to IP addresses.

43) How F5 GTM works DNS?

F5® BIG-IP® Global Traffic Manager™ (GTM) distributes DNS and user application requests based on business policies, data center and cloud service conditions, user location, and application performance.

44) What is pool and node in F5?

The difference between a node and a pool member is that a node is designated by the device’s IP address only (10.10. 10.10), while designation of a pool member includes an IP address and a service (such as 192.168. 1.1:80). A primary feature of nodes is their association with health monitors.

45) What is TMM and its functionality in F5?

The Traffic Management Microkernel (TMM) processes all load-balanced traffic on the BIG-IP system. TMM runs as a real-time user process within the BIG-IP operating system (TMOS). CPU and memory resources are explicitly provisioned in the BIG-IP configuration.

46) What is a node in F5?

A node is a logical object that provides the IP address of a single, physical backend device like a web server. Nodes are the base configuration object when creating a virtual server. In an F5 BIG-IP load balancer, a node is added automatically when you add a member to a pool.

47) What are the tasks handled by OS of big-IP?

The BIG-IP system processes tasks in both the data plane, Traffic Management Microkernel (TMM) tasks, and control plane, non-TMM tasks; however, the Linux base host operating system is not involved in processing TMM tasks and all data plane traffic is processed by TMM.

48) What is Traefik written?

Golang
Developed by the cloud infrastructure software provider Containous, Traefik is an open source reverse proxy and load balancer written in Golang.

49) How do I turn off Traefik?

To disable it, start each server with the –disable traefik option. If Traefik is not disabled K3s versions 1.20 and earlier will install Traefik v1, while K3s versions 1.21 and later will install Traefik v2 if v1 is not already present.

50) What is Svclb Traefik?

Klipper then creates a DaemonSet called svclb-traefik , which creates a pod on each node to act as a proxy to the service. Each of these pods is accessible from the node’s external IP address, and exposes ports 80 and 443 , which map to the respective ports on the service.

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Rajesh Kumar
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