CentOS7如何将Docker升级到最新版

1.查找主机上关于Docker的软件包

# rpm -qa | grep docker – – 列出包含docker字段的软件的信息
docker-ce-18.09.2-3.el7.x86_64
docker-ce-cli-18.09.2-3.el7.x86_64

2.使用yum remove卸载软件

# yum remove docker-ce-18.09.2-3.el7.x86_64
# yum removedocker-ce-cli-18.09.2-3.el7.x86_64

注：在使用docker命令会提示docker不存在

3.使用curl升级到最新版

# curl -fsSL https://get.docker.com/ | sh

4.重启Docker

# systemctl restart docker 

5.设置Docker开机自启

# systemctl enable docker

6.查看Docker版本信息

# docker -v
Docker version 19.03.5, build 633a0ea

7.查看Docker系统信息，包括镜像和容器数…

# docker info
Client:
 Debug Mode: false

Server:
 Containers: 4
  Running: 0
  Paused: 0
  Stopped: 4
 Images: 8
 Server Version: 19.03.5
 Storage Driver: overlay2
  Backing Filesystem: xfs
  Supports d_type: true
  Native Overlay Diff: true
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 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: runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 9754871865f7fe2f4e74d43e2fc7ccd237edcbce
 runc version: 09c8266bf2fcf9519a651b04ae54c967b9ab86ec
 init version: fec3683
 Security Options:
  seccomp
   Profile: default
 Kernel Version: 3.10.0-957.el7.x86_64
 Operating System: CentOS Linux 7 (Core)
 OSType: linux
 Architecture: x86_64
 CPUs: 2
 Total Memory: 1.777GiB
 Name: centos7.5
 ID: MN2D:UKMO:X2CB:FSQ3:FZYS:QB27:TEHX:QLUZ:GKZH:ALJB:GZK6:YRKF
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

WARNING: bridge-nf-call-iptables is disabled
WARNING: bridge-nf-call-ip6tables is disabled

8.使用docker images命令查看自己之前的镜像是否存在

# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
keycloak            20190709            e9c4622f7a4a        4 months ago        859MB
zentao              22                  0f79e9c210cb        5 months ago        682MB
elasticsearch       6.5.4               93109ce1d590        11 months ago       774MB
mysql               5.7                 563a026a1511        15 months ago       372MB