centos7에서 docker 설치

1. yum 리포지터리 추가

   $> wget https://download.docker.com/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker.repo
   $> yum install docker-ce -y

2. docker서비스 활성화 후 시작

   $> systemctl enable docker --now

3. Docker 정보 확인

   $> docker info
   docker info
   Client:
   Context: default
   Debug Mode: false
   Plugins:
   app: Docker App (Docker Inc., v0.9.1-beta3)
   buildx: Build with BuildKit (Docker Inc., v0.5.0-docker)
   Server:
   Containers: 10
   Running: 10
   Paused: 0
   Stopped: 0
   Images: 17
   Server Version: 20.10.1
   Storage Driver: overlay2
   Backing Filesystem: xfs
   Supports d_type: true
   Native Overlay Diff: true
   Logging Driver: json-file
   Cgroup Driver: cgroupfs
   Cgroup Version: 1
   Plugins:
   Volume: local
   Network: bridge host ipvlan macvlan null overlay
   Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
   Swarm: inactive
   Runtimes: io.containerd.runc.v2 io.containerd.runtime.v1.linux runc
   Default Runtime: runc
   Init Binary: docker-init
   containerd version: 269548fa27e0089a8b8278fc4fc781d7f65a939b
   runc version: ff819c7e9184c13b7c2607fe6c30ae19403a7aff
   init version: de40ad0
   Security Options:
   seccomp
   Profile: default
   Kernel Version: 3.10.0-1160.6.1.el7.x86_64
   Operating System: CentOS Linux 7 (Core)
   OSType: linux
   Architecture: x86_64
   CPUs: 8
   Total Memory: 15.42GiB
   Name: test.co.kr
   ID: YDW3:HAGH:ZX2W:WBP4:US75:UK3H:A55N:M2CG:D7A7:5Q5Q:45JS:GUWV
   Docker Root Dir: /home/docker
   Debug Mode: false
   Registry: https://index.docker.io/v1/
   Labels:
   Experimental: false
   Insecure Registries:
   127.0.0.0/8
   Live Restore Enabled: false