Overview

This section outlines the process of installing Docker on CentOS 7, covering both online and offline installation methods. Only CentOS 7 and later versions with kernel 3.10 or higher are supported.

Online Installation of Docker

1. Check the system version:

   cat /etc/redhat-release
   

2. Install required dependencies:

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

3. Add the Docker repository:

   yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
   

4. Update package cache:

   yum makecache fast
   

5. Install Docker Community Edition:

   yum -y install docker-ce
   

6. Start the Docker service:

   systemctl start docker
   

7. Verify the installation:

   docker version
   

8. Download and install Docker Compose:

   curl -L https://github.com/docker/compose/releases/download/1.21.2/docker-compose-$(uname -s)-$(uname -m) -o /usr/local/bin/docker-compose
   

9. Set execute permissions:

   chmod +x /usr/local/bin/docker-compose
   

10. Confirm Docker Compose installation:

    docker-compose version
    

11. Enable Docker to start at boot:

    systemctl enable docker
    

Offline Instalaltion of Docker

1. Obtain the offline installation package, typically named centos-local.tgz (contact for access).

2. Upload the package to the root directory of the server.

3. Extract the archive:

   cd /root
   tar -xvzf centos-local.tgz
   

4. Install createrepo:

   cd /root/docker-ce-local
   rpm -ivh createrepo-0.9.9-28.el7.noarch.rpm
   

5. Create a local repository configuration file:

   vi /etc/yum.repos.d/docker-ce-local.repo
   

   With the following content:

   [docker-ce-local]
   name=Local Yum
   baseurl=file:///root/docker-ce-local/
   gpgcheck=1
   gpgkey=file:///root/docker-ce-local/gpg
   enabled=1
   

6. Generate repository metadata:

   createrepo /root/docker-ce-local
   yum makecache
   

7. Install Docker CE without GPG verification:

   yum install docker-ce --nogpgcheck
   

8. Start and verify Docker:

   systemctl start docker
   docker version
   

9. Enable auto-start on boot:

   systemctl enable docker
   

10. Copy Docker Compose binary:

    cp /root/docker-ce-local/docker-compose /usr/bin/
    

11. Set execution rights:

    chmod +x /usr/bin/docker-compose
    

12. Validate Docker Compose:

    docker-compose version