Docker: GUI 应用，Ubuntu 上如何运行呢？

操作系统: Ubuntu 18.04
运行镜像: continuumio/anaconda3, based on debian

内容目录

Step 1) 安装 DockerStep 2) 准备镜像Step 3) xhost 添加 localStep 4) OpenCV 预览图片Step 5) OpenCV 预览相机结语

Step 1) 安装 Docker

代码语言：javascript复制

# update the apt package index
sudo apt-get update
# install packages to allow apt to use a repository over HTTPS
sudo apt-get install apt-transport-https ca-certificates curl gnupg2 software-properties-common

# add Docker’s official GPG key
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

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

# update the apt package index
sudo apt-get update
# install the latest version of Docker Engine and containerd
sudo apt-get install docker-ce docker-ce-cli containerd.io

允许当前非 root 用户管理 Docker：

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sudo groupadd docker
sudo usermod -aG docker $USER

参考：

Install Docker Engine on Ubuntu: https://docs.docker.com/engine/install/ubuntu/
Docker CE 清华源: https://mirrors.tuna.tsinghua.edu.cn/help/docker-ce/
Post-installation steps for Linux: https://docs.docker.com/engine/install/linux-postinstall/

Step 2) 准备镜像

拉取 OpenCV 镜像，用其显示 GUI：

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docker pull joinaero/anaconda3-opencv3:1.0.0

Step 3) xhost 添加 local

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$ xhost  local:docker
non-network local connections being added to access control list

Step 4) OpenCV 预览图片

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# 运行镜像，指明 DISPLAY
docker run -it --rm 
  --name myenv 
  -e DISPLAY 
  -e QT_X11_NO_MITSHM=1 
  -v /tmp/.X11-unix:/tmp/.X11-unix 
  -v $HOME/.Xauthority:/root/.Xauthority 
  joinaero/anaconda3-opencv3:1.0.0

# 激活 myenv 环境
conda activate myenv

# 预览 GoCoding.png
python - <<EOF
import cv2
while True:
  im = cv2.imread("/tmp/GoCoding.png")
  im = cv2.resize(im, (256, 256))
  cv2.imshow("GoCoding", im)
  key = cv2.waitKey(10) & 0xFF
  if key == 27 or key == ord('q'):
    break
EOF

Step 5) OpenCV 预览相机

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# docker --device 指明 video 设备
docker run -it --rm 
  --name myenv 
  -e DISPLAY 
  -e QT_X11_NO_MITSHM=1 
  -v /tmp/.X11-unix:/tmp/.X11-unix 
  -v $HOME/.Xauthority:/root/.Xauthority 
  --device /dev/video0 
  --device /dev/video1 
  joinaero/anaconda3-opencv3:1.0.0

# 激活 myenv 环境
conda activate myenv

# 预览相机图像
python - <<EOF
import sys
import cv2
cap = cv2.VideoCapture(0)
while True:
  ret, frame = cap.read()
  if not ret:
    sys.exit("Read the next frame failed")
  cv2.imshow("GoCoding", frame)
  key = cv2.waitKey(10) & 0xFF
  if key == 27 or key == ord('q'):
    break
cap.release()
EOF

结语

Go coding!

opencv 容器镜像服务 https 容器

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