开启IP转发

查看是否开启

• docker通讯需要开启ipforward
  sysctl -a | grep ipv4forward
net.ipv4.ip_forward = 1表示开启

开启ipforward

• 没开启的话修改参数把他开启

echo 'net.ipv4.ip_forward = 1' >> /etc/sysctl.conf

安装一些工具和依赖包

apt-get install apt-transport-https ca-certificates curl gnupg2 software-properties-common

下载密钥

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

添加软件仓库

sudo add-apt-repository \
   "deb [arch=amd64] https://mirrors.tuna.tsinghua.edu.cn/docker-ce/linux/ubuntu \
   $(lsb_release -cs) \
   stable"

更新仓库

sudo apt-get update

安装docker-ce

sudo apt-get install docker-ce

启动doceker服务

systemctl enable --now

验证是否安装成功

docker info

root@u20-58:/home/u20# docker info
Client:
 Context:    default
 Debug Mode: false
 Plugins:
  app: Docker App (Docker Inc., v0.9.1-beta3)
  buildx: Build with BuildKit (Docker Inc., v0.5.1-docker)
  scan: Docker Scan (Docker Inc., v0.8.0)

Server:
 Containers: 3
  Running: 2
  Paused: 0
  Stopped: 1
 Images: 1
 Server Version: 20.10.7
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Native Overlay Diff: true
  userxattr: false
 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: d71fcd7d8303cbf684402823e425e9dd2e99285d
 runc version: b9ee9c6314599f1b4a7f497e1f1f856fe433d3b7
 init version: de40ad0
 Security Options:
  apparmor
  seccomp
   Profile: default
 Kernel Version: 5.8.0-48-generic
 Operating System: Ubuntu 20.10
 OSType: linux
 Architecture: x86_64
 CPUs: 2
 Total Memory: 1.909GiB
 Name: u20-58
 ID: 5XG5:337F:AKD5:POKR:KOMK:UUFO:7BPM:TZ7O:E6IS:OXQ7:I5RV:NBBQ
 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