Install Docker and Learn Basic Container Manipulation in Cent.OS and RHEL 76. In this 3 article series, we will discuss about Docker, is an open source lightweight virtualization tool which runs at top of Operating System level, allowing users to create, run and deploy applications, encapsulated into small containers.Install Docker and Learn Basic Container Manipulation Part 1.This type of Linux containers are proven to be fast, portable and secure.The processes that run in a Docker container are always isolated from the main host, preventing outside tampering.Part 1 Install Docker and Learn Basic Container Manipulation in Cent.OS and RHEL 76. This tutorial provides a starting point on how to install Docker, create and run Docker containers on Cent.OSRHEL 76, but barley scratches the surface of Docker.Virtual/KVM/doc/%D0%A3%D1%81%D1%82%D0%B0%D0%BD%D0%BE%D0%B2%D0%BA%D0%B0%20KVM%20%D0%BD%D0%B0%20CentOS%206.5%20x64_files/26440231' alt='Centos 6 Create Software Raid 1 Windows 10' title='Centos 6 Create Software Raid 1 Windows 10' />Step 1 Install and Configure Docker.Docker binaries are incorporated into RHELCent.OS 7 extras repositories, the installation process being pretty simple.Install Docker package by issuing the following command with root privileges Install Docker on RHEL and Cent.OS 7 yum install docker.Install Docker on Cent.OS and RHEL 7. Install Docker on RHEL and Cent.OS 6. To install Docker, the Epel repositories must be enabled on your system by issuing the following command yum install epel release. Best Practices Software Development Processes Forrester . Install Docker on RHEL and Cent.OS 6. 2. After, Docker package has been installed, start the daemon, check its status and enable it system wide using the below commands On RHELCent.OS 7 systemctl start docker.Enable Docker on RHEL and Cent.OS 7. On RHELCent.OS 6 service docker start.Enable Docker on RHEL and Cent.This tutorial provides a starting point on how to install Docker, create and run Docker containers on CentOSRHEL 76, but barley scratches the surface of.This part of the Fedora 20 home server setup howtos will show you how to create a gaming KVM virtual machine by passing through real hardware using the new VFIO PCI.Introduction. The main goals of using redundant arrays of inexpensive disks RAID are to improve disk data performance and provide data redundancy.Centos 6 Create Software Raid 1 Windows' title='Centos 6 Create Software Raid 1 Windows' />OS 6.Finally, run a container test image to verify if Docker works properly, by issuing the following command docker run hello world.If you can see the below message, then everything is in the right place.Hello from Docker.This message shows that your installation appears to be working correctly.Docker Hello World.Now, you can run a few basic Docker commands to get some info about Docker For system wide information on Docker docker info.Check Docker Info.For Docker version docker version.Check Docker Version.To get a list of all available Docker commands type docker on your console.List Docker Commands.Step 2 Download a Docker Image.In order to start and run a Docker container, first an image must be downloaded from Docker Hub on your host.Docker Hub offers a great deal of free images from its repositories.To search for a Docker image, Ubuntu for instance, issue the following command docker search ubuntu.Search Docker Images.After you decided on what image you want to run based on your needs, download it locally by running the below command in this case an Ubuntu image is downloaded and used docker pull ubuntu.Download Docker Images.To list all the available Docker images on your host issue the following command docker images.List Docker Images.If you dont need a Docker image anymore and you want to remove it from the host issue the following command docker rmi ubuntu.Remove Docker Image.Step 3 Run a Docker Container.When you execute a command against an image you basically obtain a container.After the command that is executing into container ends, the container stops you get a non running or exited container.If you run another command into the same image again a new container is created and so on.All the containers created will remain on the host filesystem until you choose to delete them by using the docker rm command.In order to create and run a container, you need to run a command into a downloaded image, in this case Ubuntu, so a basic command would be to display the distribution version file inside the container using cat command, as in the following example docker run ubuntu cat etcissue.Run Docker Containers.The above command is divided as follows docker run local image command to run into container.To run one of the containers again with the command that was executed to create it, first you must get the container ID or the name automatically generated by Docker by issuing the below command, which displays a list of the running and stopped non running containers docker ps l.List Running Docker Containers.Once the container ID has been obtained, you can start the container again with the command that was used to create it, by issuing the following command docker start c.Here, the string c.ID. Start Docker Containers.In case the container is running state, you can get its ID by issuing docker ps command.To stop the running container issue docker stop command by specifying the container ID or auto generated name.Start Stop Docker Containers.A more elegant alternative so you dont have to remember the container ID would be to allocate a unique name for every container you create by using the name option on command line, as in the following example docker run name myname ubuntu cat etcdebianversion.Add Name to Docker Container.Then, using the name that you allocated for the container, you can manipulate container start, stop, remove, top, stats further just by addressing its name, as in the below examples docker start myname.Be aware that some of the above commands might display no output if the process of command that was used to create the container finishes.When the process that runs inside the container finishes, the container stops.Step 4 Run an Interactive Session into a Container.In order to interactively connect into a container shell session, and run commands as you do on any other Linux session, issue the following command docker run it ubuntu bash.Start Docker Container Interactive Shell.The above command is divided as follows i is used to start an interactive session.Ubuntu container.To quit and return to host from the running container session you must type exit command.The exit command terminates all the container processes and stops it.If youre interactively logged on container terminal prompt and you need to keep the container in running state but exit from the interactive session, you can quit the console and return to host terminal by pressing Ctrlp and Ctrlq keys.Keep Docker Shell Session Active.To reconnect to the running container you need the container ID or name.Issue docker ps command to get the ID or name and, then, run docker attach command by specifying container ID or name, as illustrated in the image above docker attach lt container id.To stop a running container from the host session issue the following command docker kill lt container id.Thats all for basic container manipulation.In the next tutorial we will discuss how to save, delete and run a web server into a Docker container.
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