说明

在 docker 18.09.0-3.el7 以上版本中，会自动安装 docker-ce-cli、containerd.io

作用

1. containerd.io - daemon to interface with the OS API (in this case, LXC - Linux Containers), essentially decouples Docker from the OS, also provides container services for non-Docker container managers

2. docker-ce - Docker daemon, this is the part that does all the management work, requires the other two on Linux

3. docker-ce-cli - CLI tools to control the daemon, you can install them on their own if you want to control a remote Docker daemon

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