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SSL gen-key

  • method 1

    openssl req -x509 -sha256 -nodes -days 10000 -newkey rsa:2048 -keyout app.key -out face.crt

  • method 2

    # generate key
openssl genrsa -des3 -out app.key 1024
openssl req -new -key app.key -out app.csr
# remove pass
mv app.key temp.key
openssl rsa -in temp.key -out app.key
# generate certificate
opessl x509 -req -days 365 -in app.csr -signkey app.key -out app.crt

    2017-1-17

FFMPEG record screen

ffmpeg -f x11grab -framerate 25 -r 25 -s 1920x1080 -i :0.0 output.mp4

2017-1-18

Allow camera access without https

mkdir -p /etc/opt/chrome/policies/managed
touch /etc/opt/chrome/policies/managed/test_policy.json

  • test_policy.json

    {
  "VideoCaptureAllowedUrls": ["http://www.example.com/", "http://[*.]example.edu/"]
}

  • or use cmd to start chrome

    google-chrome --use-fake-ui-for-media-stream

    2017-1-20

========

Nginx Web server and Flask

  • installation

    sudo add-apt-repository ppa:nginx/stable
sudo apt-get update
sudo apt-get install nginx
sudo /etc/init.d/nginx start

  • configure

    edit the configuration file and restart

    sudo vim /etc/nginx/sites-enabled/default
sudo /etc/init.d/nginx restart

    2017-2-4

gdb ui mode

  • command

    gdb --tui

    or toggle using Ctrl-X Ctrl-A

  • python script for gdb

    import gdb

while True:
  print('-' * 40)
  gdb.execute('run')
  e = gdb.parse_and_eval('$_exitcode')
  print('$_exitcode: %s' % e)
  if e != 0:
    break

    2017-3-1

Strace

  • find system trace system call and signals

    strace ./executable

    2017-3-1

Valgrind

  • command

    valgrind ./executable

    2017-3-1

LLDB

  • neovim plugin

    https://github.com/critiqjo/lldb.nvim

    2017-3-1

ROS (Robot Operating System)

  • setup source:

    sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu $(lsb_release -sc) main" > /etc/apt/sources.list.d/ros-latest.list'

  • setup keys:

    sudo apt-key adv --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-key 421C365BD9FF1F717815A3895523BAEEB01FA116

  • install from repository:

    sudo apt-get install ros-kinetic-desktop-full

  • install from source:

    • install bootstrap:

      sudo apt-get install python-rosdep python-rosinstall-generator python-wstool python-rosinstall build-essential

    • update bootstrap tools:

      sudo pip install -U rosdep rosinstall_generator wstool rosinstall

    • initialize rosdep

      sudo rosdep init
rosdep update

    • create source workspace

      mkdir ros_source/src -p
cd ros_source

    • pull repository

      rosinstall_generator desktop_full --rosdistro indigo --deps --wet-only --tar > indigo-desktop-full-wet.rosinstall
wstool init -j8 src indigo-desktop-full-wet.rosinstall

    • update the repository

      wstool update -j 4 -t src

    • resolve dependencies

      rosdep install --from-paths src --ignore-src --rosdistro kinetic -y

    • build

      sudo ./src/catkin/bin/catkin_make_isolated --install -DCMAKE_BUILD_TYPE=Release --install-space /opt/ros/indigo

    • add more packages

      rosinstall_generator turtlebot_navigation turtlebot_rviz_launchers --rosdistro indigo --deps --wet-only --tar > indigo-extra.rosinstall
wstool merge -t src indigo-extra.rosinstall

    2017-3-26

Heroku

  • install python3.6

    sudo add-apt-repository ppa:fkrull/deadsnakes
sudo apt-get update
sudo apt-get install python3.6

  • install virtualenv

    sudo pip install virtualenv

  • install heroku cli

    sudo add-apt-repository "deb https://cli-assets.heroku.com/branches/stable/apt ./"
curl -L https://cli-assets.heroku.com/apt/release.key | sudo apt-key add -
sudo apt-get update
sudo apt-get install heroku

  • check installation by typing credentials

    heroku login

  • create an app

    heroku create app-name

  • Procfile

    web: gunicorn gettingstarted.wsgi --log-file -
web: python manage.py runserver 0.0.0.0:5000

  • scale the app

    heroku ps:scale web=1

  • app dependencies in requirements.txt

    Django==1.9.7
gunicorn==19.6.0

  • run app locally

    heroku local web

  • push

    heroku git:remote -a app-name
git push heroku master

    2017-4-8