A Spotlight on Podman

Containerization is more than just the way forward. It is now the norm rather than the exception; all new apps are designed to leverage cloud-native features, with microservices running in containers. Containerization has enabled applications to run with immense efficiency and scalability, but the use of containers is not without its challenges.

Until very recently, the most prominent container engine was Docker. Even those running Kubernetes still rely on Docker containers as a way to orchestrate their applications. Today, however, Docker has a serious contender: Podman. Unlike Docker, which relies on daemons, Podman runs directly using runC runtime containers.

Is Podman better than Docker as a containerization engine? What are the features and advantages offered by this new solution? Let’s take a closer look and answer these questions, shall we?

#docker

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A Spotlight on Podman
Mireille  Von

Mireille Von

1625789100

Podman | Daemonless Docker | Getting Started with Podman | Tech Primers

This video covers the following topics related to Podman

⏱ Chapter timestamps

0:00 - Agenda
0:38 - What is Podman? How is it different from Docker?
2:38 - Install Podman in Linux
7:35 - How to run containers using Podman?
9:51 - Running Docker images using Podman?
15:18 - Summary

📌 Links

🔗 Podman: https://podman.io/
🔗 Podman Installation: https://podman.io/getting-started/installation.html
🔗 Podman Getting started: https://podman.io/getting-started/
🔗 Demo Spring Boot Image: https://github.com/TechPrimers/container-images/packages/39986

📌 Related Videos

🔗 Github Package Registry: https://www.youtube.com/watch?v=Nm7m92sZZJA
🔗 Containers Primer: https://www.youtube.com/watch?v=yo2g_CZZWL4&list=PLTyWtrsGknYf_Oee7YOvom5Ev0F3-E2zB
🔗 Kubernetes Primer: https://www.youtube.com/playlist?list=PLTyWtrsGknYfanKF33E12LdJvl5q5PZGp

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💥TechPrimer HindSight (Blog): https://medium.com/TechPrimers
💥Website: http://techprimers.com
💥Slack Community: https://techprimers.slack.com
💥Twitter: https://twitter.com/TechPrimers
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💥GitHub: https://github.com/TechPrimers or https://techprimers.github.io/

🎬Video Editing: FCP


🔥 Disclaimer/Policy:
The content/views/opinions posted here are solely mine and the code samples created by me are open sourced.
You are free to use the code samples in Github after forking and you can modify it for your own use.
All the videos posted here are copyrighted. You cannot re-distribute videos on this channel in other channels or platforms.
#Podman #Docker #TechPrimers

#daemonless docker #podman

Grace  Lesch

Grace Lesch

1622555415

Spotlight on CockroachDB

CockroachDB is implemented as a distributed key-value store over a monolithic sorted map, to make it easy for large tables and indexes to function. While CockroachDB is a distributed SQL database, developers treat it as a relational database because it uses the same SQL syntax. But on an architecture level, CockroachDB’s architecture is different from a relational database architecture. In CockroachDB, every table is ordered lexicographically by key. So, when we store the data on the database, we are leveraging the key value store.

#database #spotlight #cockroachdb

Podman for Docker Users

Podman is the command-line interface tool that lets you interact with Libpod, a library for running and managing OCI-based containers. It is important to note that Podman doesn’t depend on a daemon, and it doesn’t require root privileges.

The first part of this tutorial focuses on similarities between Podman and Docker, and we’ll show how you can do the following:

  • Move a Docker image to Podman.
  • Create a bare-bones Nuxt.JS project and build a container image for it
  • Push your container image to Quay.io
  • Pull the image from Quay.io and run it with Docker.

In the second part of this tutorial, we’ll walk you through two of the most important features that differentiate Podman from Docker. In this section, you will do the following:

  • Create a Pod with Podman
  • Generate a Kubernetes Pod spec with Podman, and deploy it to a Kubernetes cluster.

Prerequisites

  1. This tutorial is intended for readers who have prior exposure to Docker. In the next sections, you will use commands such as runbuildpushcommit, and tag. It is beyond the scope of this tutorial to explain how these commands work.
  2. A running Linux system with Podman and Docker installed.

You can enter the following command to check that Podman is installed on your system:

Shell

Refer Podman Installation Instructions for details on how to install Podman.

Use the following command to verify if Docker is installed:

Shell

You can refer Getting Started - Installing Git on details of installing Git.

  1. Node.js 10 or higher. To check if Node.js is installed on your computer, type the following command:
node --version
v10.16.3

If Node.js is not installed, you can download the installer from the Downloads page.

  • A Kubernetes Cluster. If you don’t have a running Kubernetes cluster, refer the “Create a Kubernetes Cluster with Kind” section.
  • Additionally, you will need a Quay.io account.

Moving Images from Docker to Podman

If you’ve just installed Podman on a system on which you’ve already used Docker to pull one or more images, you’ll notice that running the podman images command doesn’t show your Docker images:

#docker #kubernetes #cloud native #podman #cloud

Podman: Getting Started

What is Podman? How is it different from Docker?

Podman is a Daemonless Container Engine which can run OCI compatible images. It can run only on Linux machines (for now). If you have either Windows or OSX, you will have to use a Virtual Linux VM in VM Box or Hyperkit.

The major differences between Docker and podman (Pod Manager Tool) are —

  • Daemoneless — This feature differentiates itself from Docker, which runs a docker daemon to execute tasks. Podman is light-weight and doesn’t require an always running instance for running containers.
  • Rootless — Podman can be run as either root or non-root. We can run podman containers as non-root user and still be compliant with running containers.
  • Pods — The term Pods originated from Kubernetes. Pods are a collections of containers which are run as close as possible. Podman provides this feature out of the box for running multiple containers together.

Install Podman in Linux

Based on your runtime, you can choose the steps for Podman installation from the official documentation here. I will be using an Amazon EC2 with Linux, hence i will be using the following commands:

sudo curl -L -o /etc/yum.repos.d/devel:kubic:libcontainers:stable.repo https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/CentOS_7/devel:kubic:libcontainers:stable.repo
sudo yum -y install yum-plugin-copr
sudo yum -y copr enable lsm5/container-selinux
sudo yum -y install podman

To verify if podman is installed successfully, we can check the version of the podman cli. In this case, I’m using 1.9.3 version of podman cli.

podman version

Version:            1.9.3
RemoteAPI Version:  1
Go Version:         go1.13.4
OS/Arch:            linux/amd64

If you are familiar with docker, all the commands work on the same format with podman. There is a getting-started page in the podman site as well.

Some of the most commonly used commands are listed below

podman ps
CONTAINER ID  IMAGE  COMMAND  CREATED  STATUS  PORTS  NAMES

podman images
REPOSITORY   TAG   IMAGE ID   CREATED   SIZE

#open-container-initiative #docker #containers #podman #pods

Haylie  Conn

Haylie Conn

1633405101

Differences Between Docker and Podman

Docker is a container management technology. Podman is also a container technology. You can use either for building container images and storing those images in a repository. You can also use either Docker or Podman to pull container images from a registry and then run them in a target environment.

#docker #Podman