DOCKER CONCEPT FOR DBA– PART 10 : How to secure docker private repository using openssl certificate key

This document explains how to secure private repository using openssl key Before we can use a private repository, we will need to secure it and offer user authentication. Let’s create a self-signed certificate, use the ‘registry’ container by Docker to create basic user authentication, and then copy the files where they need to go onContinue reading DOCKER CONCEPT FOR DBA– PART 10 : How to secure docker private repository using openssl certificate key

DOCKER CONCEPT FOR DBA– PART 9 : How to use docker tar command in docker to re-instantiate new docker

1.Creating docker tar file from docker image.We can transfer that tar file and import to another docker instance. root@deb-VirtualBox:~# docker image save mywebserver:v1>mywebserver.tar root@deb-VirtualBox:~# ls -ltr mywebserver.tar -rw-r–r– 1 root root 330399232 May 2 19:53 mywebserver.tar 2.Remove the existing docker image  root@deb-VirtualBox:~# docker rmi -f mywebserver:v1 Untagged: mywebserver:v1 3.Please note the image is deleted root@deb-VirtualBox:~#Continue reading DOCKER CONCEPT FOR DBA– PART 9 : How to use docker tar command in docker to re-instantiate new docker

DOCKER CONCEPT FOR DBA – PART 8 How to build docker image from docker file

1.You need to create docker file first.Below is example of small test docker file. root@deb-VirtualBox:~# cat test_docker.file FROM centos:latest RUN yum update -y Here please note that FROM clause denotes first we need to pull centos image and RUN clause will run yum update on top of it. 2.Now I will build the docker imageContinue reading DOCKER CONCEPT FOR DBA – PART 8 How to build docker image from docker file

DOCKER CONCEPT FOR DBA – PART 7 Pull docker image from repository

Docker hub is repository of images for Community Edition. 1.Checking docker images available in server [root@debasiseric3 ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE 2.Let me try to pull a demo project [root@debasiseric3 ~]# docker pull hello-world Using default tag: latest latest: Pulling from library/hello-world 9bb5a5d4561a: Pull complete Digest: sha256:f5233545e43561214ca4891fd1157e1c3c563316ed8e237750d59bde73361e77 Status: Downloaded newer imageContinue reading DOCKER CONCEPT FOR DBA – PART 7 Pull docker image from repository

DOCKER CONCEPT FOR DBA – PART 6 Installation of docker UCP

This document will explain docker UCP for Enterprise grade cluster management What is Docker UCP Docker Universal Control Plane (UCP) is the enterprise-grade cluster management solution from Docker. You install it on-premises or in your virtual private cloud, and it helps you manage your Docker swarm and applications through a single interface. Universal Control PlaneContinue reading DOCKER CONCEPT FOR DBA – PART 6 Installation of docker UCP

DOCKER CONCEPT FOR DBA– PART 5 Installation of Docker Swarm

What is a docker swarm? A swarm consists of multiple Docker hosts which run in swarm mode and act as managers (to manage membership and delegation) and workers (which run swarm services). A given Docker host can be a manager, a worker, or perform both roles. When you create a service, you define its optimal state (number ofContinue reading DOCKER CONCEPT FOR DBA– PART 5 Installation of Docker Swarm

Docker concept for DBA- part 4 Install demo docker and test

Docker concept – part 4 Install demo docker and test [user@debasiseric1 ~]$ sudo su – [sudo] password for user: Last login: Mon Apr 9 12:20:36 UTC 2018 on pts/0 [root@debasiseric1 ~]# cd /etc/docker [root@debasiseric1 docker]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE centos 6 70b5d81549ec 3 days ago 195MB We need to pull theContinue reading Docker concept for DBA- part 4 Install demo docker and test

DOCKER CONCEPT FOR DBA -PART 3 device mapper for Dcoker

DOCKER Use the Device Mapper storage driver Device Mapper is a kernel-based framework that underpins many advanced volume management technologies on Linux. Docker’s devicemapper storage driver leverages the thin provisioning and snapshot capabilities of this framework for image and container management. This article refers to the Device Mapper storage driver as devicemapper, and the kernel framework as Device Mapper.Continue reading DOCKER CONCEPT FOR DBA -PART 3 device mapper for Dcoker

docker concept for DBA-part-2 Run docker for non-privileged user (Other than root)

You need to change group to docker for user (non-privileged user) otherwise you get following error:- [user@debasiseric1 ~]$ docker images Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.37/images/json: dial unix /var/run/docker.sock: connect: permission denied Now I will login to root sudo su – cd /var/run [root@debasiseric1 run]#Continue reading docker concept for DBA-part-2 Run docker for non-privileged user (Other than root)

Docker concept -part 1-Concept and Installation of docker in CentOS

A. Basic Concept of docker   Docker is a platform for developers and sysadmins to develop, deploy, and run applications with containers. The use of Linux containers to deploy applications is called containerization. Containers are not new, but their use for easily deploying applications is. Containerization is increasingly popular because containers are: Flexible: Even the most complex applicationsContinue reading Docker concept -part 1-Concept and Installation of docker in CentOS