If all is working as expected, the container will download and the following will be displayed: Unable to find image 'hello-world:latest' locally
We can test this by running the ‘hello-world’ container, which is used for testing Docker: docker run hello-world Now ‘user1’ will be able to run Docker commands, as a member of the Docker group. The last step I want to cover here is adding a non-root user to the docker group, in order to enable the user to run docker without having to use sudo: sudo usermod -a -G docker user1 └─2273 /usr/bin/dockerd -H fd:// -containerd=/run/containerd/containerd.sock Loaded: loaded (/usr/lib/systemd/system/rvice enabled vendor preset: disabled)Īctive: active (running) since Mon 14:21:27 UTC 11s ago
We can check that it’s now running by using the systemctl status command: ]$ sudo systemctl status docker To do so, run the following systemctl commands: sudo systemctl start docker With Docker CE installed, we now need to start the service, and enable it to start next time the system reboots. To perform the install, run the following: sudo yum install -y docker-ce-18.09.5 docker-ce-cli-18.09.5 containerd.io This article () covers what containerd.io is and what it does. Note that containerd.io is a package that is used by Docker, so we are installing it along with Docker CE. We can now go ahead and install the Docker CE and containerd.io. You should get some feedback to show that the repo has downloaded: adding repo from: To add the repo, run the following: sudo yum-config-manager -add-repo The next step is to add the Docker CE repository, so that yum will be able to download and install the Docker CE application. Package 7:lvm2-2.02.180-10.el7_6.8.x86_64 already installed and latest versionīut this may not always be the case, so it’s worth confirming. On my Centos 7 build, the packages were already installed: Package device-mapper-persistent-data-0.7.86_64 already installed and latest version To do so run: sudo yum install -y device-mapper-persistent-data lvm2 The first step is to install the packages that Docker is dependent on. Installing Docker Community Edition on Centos 7
I’ll be referring to this document through out this series of posts, whilst focusing on giving practical examples, whilst providing links to supporting documentation.Īs a starter, I’m going to run through how to install Docker on Centos 7. If you’re new to Docker certification, you can find out more about it here, whilst the study guide, which lists the required knowledge areas, can be found here. Over the coming weeks/months I’ll be putting some posts together here to cover the study objectives required for taking the certification exam. I’ve recently started to study for the Docker Certified Associate certification as a way to help cement the knowledge I’ve picked up whilst using containers over the past 18 months or so.
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