collabnix / dockerlabs

Docker - Beginners | Intermediate | Advanced

🏗️ Getting Started with Docker

• A $0 Learning Platform for All Levels - from the ground Up
• Over 500+ Highly Interactive Docker Tutorials and Guides
• Well tested on Docker Desktop and can be run on Browser (no Infrastructure required)

📝 Join our Community

• Join 9000+ DevOps Engineers today via Community Slack
• Join 2300+ Discord members
• Fork, Contribute & Share via DockerLabs GITHUB Repository
• Click and Follow us over Twitter

Featured Blog Posts and Articles

• Docker GenAI Stack on Windows using Docker Desktop
• A First Look at Docker Scout – A Software Supply Chain Security for Developers
• Getting Started with GenAI Stack powered with Docker, LangChain, Neo4j and Ollama
• Docker Init for Go Developers
• What is Docker Compose Include and What problem does it solve?
• Leveraging Compose Profiles for Dev, Prod, Test, and Staging Environments
• What is Docker Compose Watch and what problem does it solve?
• What is Resource Saver Mode in Docker Desktop and what problem does it solve?
• 🐳 Boost Your Docker Workflow: Introducing Docker Init for Python Developers 🚀
• How to Integrate Docker Scout with GitHub Actions

📌 Workshop/Labs (Hands-On Practical Labs)

Title	Topics Covered	Labs
Getting Started	Why, What & How about Docker?(slides)	-
Docker Core Concepts	Concepts of Docker Image, Containers, Multi-container apps	-
Docker for Beginner	Docker Image, Container, Dockerfile, Volumes, Networking	40
Docker for Intermediate	Docker Compose, Swarm, Advanced Networking	50
Docker for Advanced	Docker Security, Content Trust, Image Scanning, Swarm Mode Security	31
Docker Desktop	Docker Dashboard, Dev Environments, Extensions	5

Latest Docker Desktop Features and Demos

Title	Topics Covered	Category	Labs
Docker Scout	Scout CLI, Scout Sample Demo	Security	2
Docker Extensions	Docker Extensions	Development Tools	1
Docker init	Dockerfile, Compose, Python, Go, Rust, Node	Developer Tools	5
Docker init for Python	Dockerfile, Compose, Python	Developer Tools	1
Docker init for Go	Dockerfile, Compose, Go	Developer Tools	1
Docker init for Rust	Dockerfile, Compose, Rust	Developer Tools	1
Docker init for ASP.NET	Dockerfile, Compose, .NET	Developer Tools	1
Docker init for PHP	Dockerfile, Compose, PHP	Developer Tools	1
Compose Watch	Compose, Sync, Rebuild	Developer Tools	1
Compose Include	Compose, Include	Developer Tools	1
Compose Profile	Compose, Profile, Staging, Prod	Developer Tools	1

Industry Use cases

Title	Topics Covered	Labs
Docker for AI	Docker for Data Scientist	1
Docker for Leading IDEs	Developer IDEs	Not Started
Docker for Financial Service	-	Not Started
Docker for Healthcare	-	Not Started

Containerd Blogs & Resources

Title	Topics Covered	Labs
What is Containerd and what problems does it solve	-	Not Started
Containerd and Kubernetes	-	Not Started
How To Run Containerd On Docker Desktop	-	Not Started
Getting Started With Containerd 2.0	-	Not Started
Containerd Vs Docker: What’s the difference?	-	Not Started

Docker WorkShop for Beginners

Pre-requisite:

• Creating Your DockerHub Account

Getting Started with Docker Image

• Running Hello World Example
• Working with Docker Image
• Saving Images and Containers as Tar Files for Sharing
• Building Your First Alpine Docker Image and Push it to DockerHub

Accessing & Managing Docker Container

• Accessing the Container Shell
  
• Running a Command inside running Container
  
• Managing Docker Containers
  

Getting Started with Dockerfile

• What is Dockerfile
  
• Understanding Layering Concept with Dockerfile
• Creating Docker Image with
  • Lab #1: Installing GIT
    
  • Lab #2: ADD instruction
    
  • Lab #3: COPY instruction
    
  • Lab #4: CMD instruction
    
  • Lab #5: ENTRYPOINT instruction
    
  • Lab #6: WORKDIR instruction
    
  • Lab #7: RUN instruction
    
  • Lab #8: ARG instruction
    
  • Lab #9: ENV instruction
    
  • Lab #10: VOLUME instruction
    
  • Lab #11: EXPOSE instruction
    
  • Lab #12: LABEL instruction
    
  • Lab #13: ONBUILD instruction
    
  • Lab #14: HEALTHCHECK instruction
    
  • Lab #15: SHELL instruction
    
  • Lab #16: Entrypoint Vs RUN
    
  • Lab #17: USER instruction
• Writing Dockerfile with Hello Python Script Added
  

Creating Private Docker Registry

• Building a Private Docker Registry
• Building a Private Docker Registry with UI

Docker Volumes

• Managing volumes through Docker CLI
  
• Creating Volume Mount from docker run command & sharing same Volume Mounts among multiple containers
  

Docker Networking

• The docker network Command
  
• Lab #1: Listing the Networks
• Lab #2: Inspecting a Network
• Lab #3: List network driver plugins
• Lab #4: Docker Bridge Networking
  • Lab #5: Basics of Docker Bridge Networking
  • Lab #6: Connect a Docker container to bridge network
  • Lab #7: Test Network Connectivity
  • Lab #8: Configure NAT for external connectivity

Docker Workshop for Intermediate Users

Docker Compose

• Compose101 Slides

• Introduction to Docker Compose

• Dockerfile Vs Docker compose

• How to Install Docker Compose?

  • Lab #1: version Command
    
  • Lab #2: help Command
    
  • Lab #3: Config Command
    
  • Lab #4: Build Command
    
  • Lab #5: Pull Command
    
  • Lab #6: Push Command
    
  • Lab #7: up Command
    
  • Lab #8: Images Command
    
  • Lab #9: ps Command
    
  • Lab #10: Stop Command
    
  • Lab #11: Start Command
    
  • Lab #12: Restart Command
    
  • Lab #13: pause Command
    
  • Lab #14: Unpause Command
    
  • Lab #15: Logs Command
    
  • Lab #16: Port Command
    
  • Lab #17: Run Command
    
  • Lab #18: Scale Command
    
  • Lab #19: Exec Command
    
  • Lab #20: Kill Command
    
  • Lab #21: Rm Command
    
  • Lab #22: Down Command
    

• Create first docker compose file with ngnix and mysql
  

• Use JSON instead of YAML compose file in Docker?
  

• A Simple Wordpress Application running on Single Node using Docker Compose

Docker Swarm

Introduction to Docker Swarm

• What is Docker Swarm
  
• Docker Swarm : Terminology

Docker Services | Scaling | Draining Node | Rescheduling Containers

• Creating 5-Node Docker Swarm Cluster
  
• Lab #1: Creating Overlay Network
  
• Lab #2: Deploy Services
  
• Lab #3: Inspecting Docker Swarm Service States
  
• Lab #4: Scaling Docker Swarm Services
  
• Lab #5: Deploy the application components as Docker services
  
• Lab #6: Drain a node and reschedule the containers
  
• Lab #7: Cleaning Up
  

Docker Networking - II

Overlay Networking

• Lab #1: Docker Overlay Networking
  
• Lab #2: Create an overlay network
  
• Lab #3: Create a service
  
• Lab #4: Test Service Discovery
• Lab #5: Test Routing Mesh
  
• Lab #6: Test standalone containersinOverlayNetwork

Implementing MacVLAN

• Lab #7: Getting Started with MacVLAN
  

Docker Workshop for Advance Users

Docker Security101

Docker Content Trust

• Lab01 - Pulling images by tag
• Lab02 - Pulling images by digest
• Lab03 - Docker Content Trust
• Lab04 - Official Images
• Lab05 - Extra for experts
• Lab06 - Enable Docker Content Trust
• Lab07 - Push & Sign an Image
• Lab08 - Cleaning Up

Docker Secrets Management

• Lab01- Create a Secret
• Lab02 - Manage Secrets
• Lab03 - Access the secret within an app
• Lab04 - Clean-up

Docker Secret Management with UCP

• Lab01 - Create a Secret
• Lab02 - Deploy an App
• Lab03 - Test the App
• Lab04 - View the Secret

Docker Network Security

• Lab01 - Create an encrypted overlay network
• Lab02 - List networks
• Lab03 - Deploy a service
• Lab04 - Clean-up

Security Scanning

• Lab01 - Create a private Hub repo
• Lab02 - Pull an image
• Lab03 - Tag and push an image
• Lab04 - View scan results
• Lab05 - Clean-up

Swarm Mode Security

• Lab01- Create a new Swarm
• Lab02 - Add a new Manager
• Lab03 - Add a new Worker
• Lab04 - Rotate Join Keys
• Lab05 - View certificates
• Lab06 - Rotate certificates

🔥 Concepts and Terminologies (Beginners to Advance)

• Docker for Beginners
• Docker for Intermediate
• Docker for Advanced
• Docker Cheatsheet
• Docker Certificate Associate Exam Preparation
• Docker Interview Questions

🗃️ Sample App

We recommend you to visit Docker Awesome Compose Repository in order to find the Compose files for running sample apps

Web Framework

Python/Django
Docker + Django + PostgreSQL
Python + Flask + Redis

Reactjs
React + Spring + MySQL
React + Express + MySQL
React + Express + MongoDB
React + Rust + PostgreSQL
React + Nginx

Golang
Go + NGINX + MySQL
Go + NGINX + PostgreSQL
Docker + Gomodule

Java / Spring Boot
Spring + PostgreSQL
Java Spark + MySQL

Database

PostgreSQL
Docker + Django + PostgreSQL

MongoDB
NGINX + Flask + MongoDB
NodeJS + MongoDB

MySQL
NGINX + ASP.NET + MySQL`

Monitoring

Prometheus
Docker + Prometheus Stack + Docker Swarm

Logging

Elastic
Docker + Elasticsearch + Logstash + Kibana + Docker Swarm
Elasticsearch + Logstash + Kibana

Testing Tools

Apache JMeter
Docker + Apache Jmeter + Docker Swarm Mode

Networking

MacVLAN
Docker + MacVLAN
Docker + Docker Compose & IPv6

Security

Docker Security
Introduction to Docker Security
Running Containers as ROOT

Docker Scout Resources and Links

This is a curated list of Docker Scout related resources. It is not an official list, but a community effort to help people find the best stuff for Docker Scout in 2023 and beyond.

Download Docker Scout Cheatsheet Now!!

Scout Blogs

• Skout - Docker Scout for Your Kubernetes
• Enhancing Your GitHub Workflow with Docker Scout
• Achieve Security and Compliance Goals with Policy Guardrails in Docker Scout
• A First Look at Docker Scout – A Software Supply Chain Security for Developers
• Docker Scout vs Scan
• How to scan container images with Docker Scout
• Mastering Docker Scout through Docker Desktop GUI and CLI
• Vulnerability and Dependency Scanning with Docker Scout
• Docker 4.18 Extends Scout, Adds Container File Explorer, Docker Init, and More
• Using Docker Scout to Scan Container Images
• Understanding Docker: part 42 – Docker Scout
• How to Integrate Docker Scout with GitHub Actions
• Scan Container Images for Vulnerabilities with Docker Scout
• Docker Scout by Fsegredo
• How to Integrate Docker Scout with GitLab
• Docker Scout Unveils Advanced Features to Bolster Software Supply Chain Integrity
• How to integrate Docker Scout with Azure Container Registry
• CI pipeline with Docker Scout and SAST scanning for an OWASP-based Python app

Scout Tutorials

• Docker Scout quickstart
• Docker Scout Advanced image analysis
• Integrate Docker Scout with GitHub Actions
• Integrate Docker Scout with GitLab CI
• Integrate Docker Scout with Microsoft Azure DevOps Pipelines
• Integrate Docker Scout with Circle CI
• Integrate Docker Scout with Jenkins
• Advisory Database sources and matching service
• Docker Scout Integration with SonarQube

GitHub Sample projects for Scout

• Scout Action
• Scout CLI

Scout Case Studies

• How JW Player Secured 300 Repos in an Hour with Docker Scout
• Sysdig and Docker Forge Alliance to Accelerate Cloud-Native Security

Scout Featured Videos

Docker Scout: Securing The Complete Software Supply Chain (DockerCon 2023)	Cut Through Vulnerability Noise with Runtime Insights (DockerCon 2023)

Docker Scout: Live Demo, Insights, and Q&A	Vulnerability Scanning and Reporting

Find Vulnerabilities Fast! New Docker CLI Command	Adding the docker scout feature to the Docker CLI

How to scan Container image using Docker Scout	Docker Scout Tutorial: Docker scanning

TECHarlas #3 - Supply chain, Docker Scout y seguridad en contenedores con Felipe Cruz de @DockerIo

👥 Governance

Dockerlabs is an independent community project founded by Ajeet Singh Raina, a Docker Captain from India & Docker Community Leader which is now being built & shaped by a growing community of contributors across the globe.

Core Contributors

Ajeet Singh Raina	Sangam Biradar	Savio Mathew	Saiyam Pathak	Apurva Bhandari	Sarkar Tathagata	Prashansa K
Wikitops	Akshit Grover	Ameya Agashe	Bala

🚀 How to Contribute

Thank you so much for showing your interest in contributing to Dockerlabs tutorials.

Guide to submitting your own tutorial
Template for writing Tutorial Page

License

Apache License 2.0

Proceed to Beginners Track >>

dockerlabs's Issues

Improve Sample Apps section - Add a showcase page

Right now, the Sample app section looks a bit old https://github.com/collabnix/dockerlabs#%EF%B8%8F-sample-app
It would be great if we can create a showcase page with tables highlighting thumbnails for each of these projects.

Slack join link is expired

Describe the bug
It seems that the Slack join link is expired. I cannot find a way to join the slack.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://dockerlabs.collabnix.com/kubernetes/kubetools/
2. Click on the "Join Slack" button
3. See the error message: "The link is no longer active" (see the below screenshot)

Expected behavior
I can see the webpage to register the account.

Screenshots

Additional context

• The link on https://github.com/collabnix/dockerlabs is also expired.
• This is the same as #64

Docker Compose with Secrets

@Prashansa-K Are you planning to contribute towards this tutorial?

Docker templt

Building a Private Docker Registry Failing Due to Permissions Error and Requires `REGISTRY_HTTP_HOST` flag

Local host registry permissions failing as per documentation instructions

To Reproduce
Steps to reproduce the behavior:

1. Start the container as per instructions
2. Below error is produced when attempting to push to local registry and continuously loops until HTTP 500 server failure

$ docker run -d \
  -p 5000:5000 \
  --name registry \
  -v /registry/data:/var/lib/registry \
  --restart always \
  registry:2

$ docker push  localhost:5000/alpine:3.6
The push refers to repository [localhost:5000/alpine]
<CONTAINER-ID>: Retrying in 1 second **<---- Continuous loop**

Expected behavior
Push of container to local repo should be successful first time

Screenshots
NA. see code snippets

Desktop (please complete the following information):

• MAC OS Ventura 13.1
• Docker version 20.10.22, build 3a2c30b

Additional context
Issue is resolved by adding REGISTRY_HTTP_HOST flag which sets correct working permissions and is successful

$ docker run -e REGISTRY_HTTP_HOST=localhost:50001 -d -p 5001:5000 --name registry registry:2

The push refers to repository [localhost:5001/alpine]
721384ec99e5: Pushed

Helm for beginners

I would like to add new section, Helm for beginners

Trying to get in touch regarding a security issue

Hey there!

I'd like to report a security issue but cannot find contact instructions on your repository.

If not a hassle, might you kindly add a SECURITY.md file with an email, or another contact method? GitHub recommends this best practice to ensure security issues are responsibly disclosed, and it would serve as a simple instruction for security researchers in the future.

Thank you for your consideration, and I look forward to hearing from you!

(cc @huntr-helper)

SHELL page doesn't show how to use SHELL

Describe the bug
SHELL page doesn't show how to use the SHELL instruction

To Reproduce
Steps to reproduce the behavior:

1. Go to SHELL page
2. Look at the code blocks (Dockerfile contents)

Expected behavior
SHELL instruction should've been used somewhere

[docker] Upgrade labs for cross-platform compatibility

Describe the bug
When running examples/labs for the docker workshop locally people will find that some Dockerfiles won't build because they are targeting a specific arch different than the one the user is running the docker daemon.

I have seen a lot of Dockerfiles targetting, for eg, alpine:3.5 as the base image which is amd64 specific
If you run the build in an arm64v8 arch like myself which I have a Mac you might encounter this compatibility error.

To Reproduce
Steps to reproduce the behavior:

1. Check that your running architecture differs from amd64

uname -m // arm64

2. Try to build this testing Dockerfile

FROM alpine:3.5
CMD ["/bin/echo", "Works!"]

docker build -t try .

4. See error

[+] Building 1.1s (3/3) FINISHED                                                                                  docker:desktop-linux
 => [internal] load build definition from Dockerfile                                                                              0.0s
 => => transferring dockerfile: 79B                                                                                               0.0s
 => [internal] load .dockerignore                                                                                                 0.0s
 => => transferring context: 2B                                                                                                   0.0s
 => ERROR [internal] load metadata for docker.io/library/alpine:3.5                                                               1.0s
------
 > [internal] load metadata for docker.io/library/alpine:3.5:
------
Dockerfile:1
--------------------
   1 | >>> FROM alpine:3.5
   2 |     CMD ["/bin/echo","Works!"]
--------------------
ERROR: failed to solve: alpine:3.5: no match for platform in manifest sha256:66952b313e51c3bd1987d7c4ddf5dba9bc0fb6e524eed2448fa660246b3e76ec: not found

Expected behavior
Build should be possible with more archs different than amd64.
There are some images that are multi-arch in the alpine official repo for the case and for the many other OS base-image repos that are used in the workshop.

Proposed solution

For alpine references please use instead apline:3 that targets to alpine:latest which is compatible with 386, amd64 and arm architectures. Proves to work well in my arm64v8 Mac.

Desktop (please complete the following information):

• OS: uname -a
  Darwin Demians-MacBook-Pro.local 22.5.0 Darwin Kernel Version 22.5.0: Thu Jun 8 22:22:20 PDT 2023; root:xnu-8796.121.3~7/RELEASE_ARM64_T6000 arm64

Kudos to the creator and contributors of this wonderful workshop!

Etcd config mistake

Describe the bug
Recently, I has read your post at
http://dockerlabs.collabnix.com/kubernetes/beginners/Install-and-configure-a-multi-master-Kubernetes-cluster-with-kubeadm.html

I'm aware of having a mistake at etcd systemd config.

To Reproduce
Only need change

--listen-peer-urls https://10.10.40.10:2380

to

--listen-peer-urls https://10.10.10.90:2380

A good day to you!

Screenshots

ONBUILD page doesn't show how to use ONBUILD

Describe the bug
ONBUILD page doesn't show how to use the ONBUILD command?

To Reproduce
Steps to reproduce the behavior:

1. Go to ONBUILD page
2. Look at the code blocks (Dockerfile contents)

Expected behavior
ONBUILD command should've been used somewhere

[DockerLab] no matches for kind "Deployment" in version "apps/v1beta2"

Describe the bug
In DockerLab excercice Deployment 101, creating a deployment returns following error :
error: unable to recognize "nginx-dep.yaml": no matches for kind "Deployment" in version "apps/v1beta2"

To Reproduce
Steps to reproduce the behavior:

1. go to dockerlabs/kubernetes/workshop/Deployment101
2. run "kubectl create -f nginx-dep.yaml"
3. See error

Expected behavior
deployment.apps/nginx-deployment should be created

docs: Capabilities page - Images can store file-based capabilities

https://dockerlabs.collabnix.com/advanced/security/capabilities/

dockerlabs/advanced/security/capabilities/README.md

Line 37 in 962fab8

Docker imposes certain limitations that make working with capabilities much simpler. For example, file capabilities are stored within a file's extended attributes, and extended attributes are stripped out when Docker images are built. This means you will not normally have to concern yourself too much with file capabilities in containers.

dockerlabs/advanced/security/capabilities/README.md

Line 281 in 962fab8

Docker images cannot have files with capability bits set. This reduces the risk of Docker containers using capabilities to escalate privileges. However, it is possible to mount volumes that contain files with capability bits set into containers. Therefore you should use caution if doing this.

These are inaccurate. The limitation was removed with BuildKit / buildx IIRC which has been the default image builder since Docker 23 (released Feb 2023), which can preserve extended file attributes.

I believe the main issue prior was that you'd lose the extended attributes via a COPY but they would otherwise remain intact so long as the image layer was on a file system that supported the file attributes? (I recall an issue with AUFS, which may still be problematic for some NAS systems)

[Bug reporting] XSS vulnerabilty in wp_kses_bad_protocol in wp-includes/kses.php (CVE-2019-20041)

Hi

Our research team in KAIST WSP Lab found a known XSS vulnerability in the recent version of dockerlabs.
In particular, the bug we report is a known bug by CVE-2019-20041.

wp_kses_bad_protocol in wp-includes/kses.php in WordPress before 5.3.1 mishandles the HTML5 colon named entity, allowing attackers to bypass input sanitization, as demonstrated by the javascript: substring.

Please check this line.

Thanks!

update error

On my Jetson Nano

after enter
curl -sSL https://get.docker.com/ | sh

and it shows the error like

E: The repository 'https://nvidia.github.io/libnvidia-container/ubuntu18.04/arm64 Release' does not have a Release file.
E: The repository 'https://nvidia.github.io/nvidia-container-runtime/ubuntu18.04/arm64 Release' does not have a Release file.
E: The repository 'https://nvidia.github.io/nvidia-docker/ubuntu18.04/arm64 Release' does not have a Release file.

How to solve it? Thanks so much

Readme

sir, dockerlabs Needs it's Readme Revamped @ajeetraina

slack invite link is not working

Hi,

This issue is not related with project itself. I want to contribute but not able to join slack channel through provided link. It is showing this error message https://screenshots.firefox.com/tq6fBpPVGFen0ajc/collabnix.slack.com .

incorrect link attachment

Link given for docker compose with secrets is the readme page -> https://github.com/collabnix/dockerlabs/blob/master/intermediate/README.md

update bot

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.

Add Discord Channel

As Collabnix has discord channel, it would be great to have the following entry in _layouts/index.html:

<h3> Join Collabnix Discord Channel </h3>
        
       <iframe src="https://discordapp.com/widget?id=1020180904129335379&theme=dark" width="350" height="500" allowtransparency="true" frameborder="0"></iframe>

Source file for the cheat sheet image?

Hi, is there a source file for the cheat sheet image?
https://raw.githubusercontent.com/sangam14/dockercheatsheets/master/dockercheatsheet8.png

It's a very useful one, I print it out, but since it's a PNG it looks blurry on paper. Also, I would like to make text darker to increase contrast, so it's easier to read. Thanks!

Add section Docker Multi-Stage Build

I would like to add a new section, talking about multi-stage-build

my repo: https://github.com/thiagolsfortunato/docker-mult-stage-build

Could I create a new PR on this repo? 😅

Define journey for Azure, AWS and Google Cloud Engineers

The idea is to define journey for new beginners who are coming from Cloud background
Example: Say, Alex is an AWS Admin. He is planning to get into Docker. What would the journey for him look like?

Dockerfile EXPOSE LAB 11: --format empty on the website

Describe the bug
on this lab: https://dockerlabs.collabnix.com/beginners/dockerfile/Lab%2311:EXPOSE_instruction.html
Looking at the inspect section

the website show:
docker image inspect --format expose:v1
rather than
$ docker image inspect --format {{.ContainerConfig.ExposedPorts}} expose:v1

This might be some kind of the bug regarding the static website generator engine

Error: context deadline exceeded

While executing command : ETCDCTL_API=3 etcdctl member list --endpoints=https://192.168.1.11:2379 --cacert=ca.pem --cert=kubernetes.pem --key=kubernetes-key.pem

getting error : Error: context deadline exceeded

---

My etcd.service file:

[Unit]
Description=etcd
Documentation=https://github.com/coreos

[Service]
ExecStart=/usr/local/bin/etcd
--name 192.168.1.11
--cert-file=/etc/etcd/kubernetes.pem
--key-file=/etc/etcd/kubernetes-key.pem
--peer-cert-file=/etc/etcd/kubernetes.pem
--peer-key-file=/etc/etcd/kubernetes-key.pem
--trusted-ca-file=/etc/etcd/ca.pem
--peer-trusted-ca-file=/etc/etcd/ca.pem
--peer-client-cert-auth
--client-cert-auth
--initial-advertise-peer-urls https://192.168.1.11:2380
--listen-peer-urls https://192.168.1.11:2380
--listen-client-urls https://192.168.1.11:2379,https://127.0.0.1:2379
--advertise-client-urls https://192.168.1.11:2379
--initial-cluster-token etcd-cluster-0
--initial-cluster 192.168.1.11=https://192.168.1.11:2380,192.168.1.12=https://192.168.1.12:2380,192.168.1.13=https://192.168.1.13:2380
--initial-cluster-state new
--data-dir=/var/lib/etcd
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target

sudo systemctl status etcd

● etcd.service - etcd
Loaded: loaded (/etc/systemd/system/etcd.service; enabled; vendor preset: disabled)
Active: active (running) since Thu 2021-07-15 18:22:59 IST; 22min ago
Docs: https://github.com/coreos
Main PID: 2248 (etcd)
Tasks: 12
Memory: 31.2M
CGroup: /system.slice/etcd.service
└─2248 /usr/local/bin/etcd --name 192.168.1.11 --cert-file=/etc/etcd/kubernetes.pem --key-fi...

Jul 15 18:45:48 vm11 etcd[2248]: 91bdf612a6839630 [logterm: 1, index: 3] sent MsgVote request to b... 4207
Jul 15 18:45:49 vm11 etcd[2248]: health check for peer bb39bdb8c49d4b1b could not connect: dial tc...HOT")
Jul 15 18:45:49 vm11 etcd[2248]: health check for peer bb39bdb8c49d4b1b could not connect: dial tc...AGE")
Jul 15 18:45:49 vm11 etcd[2248]: health check for peer dc0336cac5c58d30 could not connect: dial tc...AGE")
Jul 15 18:45:49 vm11 etcd[2248]: health check for peer dc0336cac5c58d30 could not connect: dial tc...HOT")
Jul 15 18:45:50 vm11 etcd[2248]: 91bdf612a6839630 is starting a new election at term 4207
Jul 15 18:45:50 vm11 etcd[2248]: 91bdf612a6839630 became candidate at term 4208
Jul 15 18:45:50 vm11 etcd[2248]: 91bdf612a6839630 received MsgVoteResp from 91bdf612a6839630 at term 4208
Jul 15 18:45:50 vm11 etcd[2248]: 91bdf612a6839630 [logterm: 1, index: 3] sent MsgVote request to b... 4208
Jul 15 18:45:50 vm11 etcd[2248]: 91bdf612a6839630 [logterm: 1, index: 3] sent MsgVote request to d... 4208
Hint: Some lines were ellipsized, use -l to show in full.

broken link

link is broken for Diving Deeper into the Docker Network Namespaces Configuration in https://github.com/collabnix/dockerlabs/blob/master/intermediate/README.md

broken link

link is for Verifying host-level settings that impact Docker networking in https://github.com/collabnix/dockerlabs/blob/master/intermediate/README.md

Docker Manifest Inspect

When i try use the docker manifest inspect in lab return this message

$docker manifest inspect jenkins-docker/jenkins:lts-jdk11
errors:
denied: requested access to the resource is denied
unauthorized: authentication required

after i use docker login

But on my machine it works , sorry about the joke, checking the local and remote version I identified a difference with respect to the versions, I'm sending the diff I made between the versions of the environments.

DiffDockerVersion.txt

Tks about this issue!

Portus Images are not displayed

https://dockerlabs.collabnix.com/beginners/portus/ doesnt show up images. Please fix it Cc @sangam14

A weird IP in this HA K8S deployment doc 10.10.40.10 ?

I am following this doc to setup a HA K8S cluster with 3 master and 5 worker nodes.

Question 1
In the section of [7- Create an etcd systemd unit file] under [Installing and configuring Etcd] , suddenly there was an IP address which never mentioned anywhere showed up -- 10.10.40.10 The setup in this doc has no subnet of 10.10.40.x defined.

--listen-peer-urls https://10.10.40.10:2380 \

wondering if it was a typo or this IP means something?. This IP here does not make any sense in this config file. There is another 10.10.40.x IP address in this doc which was also suddenly just showed up from no where.

listen-peer-urls should be set to other 2 master machines or just itself?

Question 2
Then, at the beginning of the doc, it was mentioned that an IP range for the pods will be 10.30.0.0/16 --- /16
But in the later section Initializing the master nodes it set to networking: podSubnet: 10.30.0.0/24 ??

Thanks

Tagging section title is wrong written in lab 2 of docker lab for beginners

Describe the bug

In lab 2 of docker lab for beginners, the tittle for tagging is "Tagging image as labs-git" but I suppose it should be "Tagging image as labs-add"

Docker Multi Stage Build

Hi All,

I am understanding the Docker Multi Stage Build which says:

1. We pull an image and execute few command which create few binaries (executable)
2. We extract that binaries from container
3. We run those extracted binaries on new container using a small size image (which support Binaries)

Why DO NOT we keep the binaries and delete remaining stuff there it self in Step 2. It will reduce our image size
If we are able to delete, we DO NOT need to perform Step 3.

Wrong link

My students who observed this issue.

When you access https://dockerlabs.collabnix.com/workshop/docker/ in Getting Started with Dockerfile the URL #Lab7 send you to https://dockerlabs.collabnix.com/beginners/dockerfile/Lab-7-Create-an-image-with-EXPOSE-instruction.html but when you practicing Lab#6 in end the URL send you to https://dockerlabs.collabnix.com/beginners/dockerfile/Lab%237:RUN_instruction.html

And congratulation for this material

Broken link Intermediate Track

Describe the bug
Links are broken for Intermediate Track --> Introduction to Docker Networking
To Reproduce
Steps to reproduce the behavior:

1. Go to 'Intermediate Track'
2. Click on 'Understanding Docker Container Networking'
3. See error

Links
https://dockerlabs.collabnix.com/intermediate/beginners/dockercontainernetworking.md
https://dockerlabs.collabnix.com/intermediate/beginners/DiffBridgeVsOverlay.md