Centos7 installation installation deployment docker

Installing and deploying Docker on CentOS 7 is very simple and only requires a few simple steps to complete. Here are the detailed steps and instructions:

1. Update system

Before installing Docker, you first need to update the CentOS 7 operating system. Use the following command to update your system:

sudo yum update

1. Install necessary software packages

Installing Docker on CentOS 7 requires installing some necessary software packages, including yum-utils, device-mapper-persistent-data and lvm2. Install these packages using the following command:

sudo yum install -y yum-utils device-mapper-persistent-data lvm2

1. Add Docker repository

After installing the necessary software packages, you need to add the Docker repository to install Docker. Add the Docker repository using the following command:

sudo yum-config-manager --add-repo 

1. Install Docker

After adding the Docker repository, you can use the following command to install Docker:

sudo yum install docker-ce

1. Start Docker

After installing Docker, you can use the following command to start Docker:

sudo systemctl start docker

1. Set Docker to start automatically at boot

In order to ensure that Docker starts automatically when the system starts, you need to use the following command to add Docker to the system startup items:

sudo systemctl enable docker

1. Test Docker

After installing and starting Docker, you can use the following command to test whether Docker is installed correctly:

sudo docker run hello-world

If Docker is installed correctly, the words Hello from Docker! will be output.

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