Instale o Docker no sistema operacional Ubuntu 20.04

1. Adicione o repositório do Docker

curl -fsSL https://mirrors.ustc.edu.cn/docker-ce/linux/ubuntu/gpg | sudo apt-key add -

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

2. Instale o Docker

sudo apt-get install docker-ce docker-ce-cli containerd.io -y

3. Adicione a imagem do Docker de configuração

cat <<EOF | tee /etc/docker/daemon.json
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "registry-mirrors": ["https://aoewjvel.mirror.aliyuncs.com"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2"
}
EOF

4. Inicie o Docker && junte-se à inicialização automática

mkdir -p /etc/systemd/system/docker.service.d
systemctl daemon-reload
systemctl restart docker
systemctl enable --now docker
systemctl status docker