This is a collection of code snippets
sudo apt-get install zsh
sh -c "$(curl -fsSL https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh)"
chsh -s /bin/zsh
sudo dpkg -i path/to/the/file
sudo apt-get install nodejs-legacy
sudo apt-get install npm
sudo apt-get remove <package-name>
sudo apt-get purge <package-name>
<script src="https://cdn.jsdelivr.net/npm/vue@2.5.13/dist/vue.js"></script>
npm install create-react-app
create-react-app app-name
cd app-name
npm start
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv EA312927
echo "deb http://repo.mongodb.org/apt/ubuntu "$(lsb_release -sc)"/mongodb-org/3.2 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.2.list
sudo apt-get update
sudo apt-get install -y mongodb-org
We have to create a new mongodb systemd service file in the /lib/systemd/system directory. Go to that directory and create the new mongodb service file mongod.service with nano.
sudo nano /etc/systemd/system/mongodb.service
Paste the script below
[Unit]
Description=High-performance, schema-free document-oriented database
After=network.target
[Service]
User=mongodb
ExecStart=/usr/bin/mongod --quiet --config /etc/mongod.conf
[Install]
WantedBy=multi-user.target
Now update the systemd service and start mongodb:
systemctl daemon-reload
systemctl start mongod
systemctl enable mongod
sudo apt-get install nginx nginx-full nginx-common
then reboot system Check the firewall and allow nginx HTTP
sudo ufw app list
sudo ufw allow 'Nginx HTTP'
sudo ufw status
If ufw is inactive enable it
sudo ufw enable
Whenever you create a new server, just add them into the conf.d directory /etc/nginx/conf.d/
sudo nano /etc/nginx/conf.d/myWebsite.d
Put a specific server config in that file
server {
listen 8080;
server_name localhost;
location / {
root /path/to/the/folder/;
index index.html index.htm;
}
#redirect server error pages to the static pages /50x.html
error_page 500 502 503 504 /50x.html;
location = /50x.html{
root html;
}
}
sudo apt-get install software-properties-common
sudo apt-add-repository -y ppa:rael-gc/rvm
sudo apt-get update
sudo apt-get install rvm
rvm install ruby
gem install rails
rails new <app-name>
https://hackernoon.com/how-to-create-and-deploy-a-telegram-bot-2addd8aec6b4
this is a very nice article about deployment
navigate to the project folder
pip freeze > requirements.txt
now create a Procfile ( but for windows it is Procfile.windows)
it should contain
web: python my_bot_name.py
Also add an init.py to the project folder. It can be empty Push the project to a git repository Install Heroku CLI
npm install heroku -g
To verify the installation, try heroku --version
Create an account in heroku.com
Now follow these steps
heroku login
heroku create
git push heroku master
heroku ps:scale web=1
heroku open
Now your project runs on heroku server To check the logs
heroku logs --trail
Create a new config file inside /etc/nginx/sites-available/
if the name of th config file is app
Then the config file will be
/etc/nginx/sites-available/app
server{
listen 80;
server_name domain.com
location / {
proxy_pass "http://0.0.0.0:8080"
}
}
Also create a soft link to /etc/nginx/sites-enabled/ like:
sudo ln /etc/nginx/sites-available/app /etc/nginx/sites-enabled/app
Delete any unwanted files inside the sites-available and sites-enabled folders
If you want to use the forwarded hostname as the proxy header
Add this inside the location / { .... }
proxy_redirect http://kutt.com/ http://0.0.0.0:8090;
proxy_set_header Host $host;
pg_dump <db-name> > output-file.bak
If it is from docker container
sudo docker container ls // to get container id
sudo docker exec -it <container-id> pg_dump -U <db-user> <db-name> > bkup.bak
Drop the database if it exists and create a new one
psql <db-name> < output-file.bak
Try this
psql mydatabase -c "GRANT ALL ON ALL TABLES IN SCHEMA public to dbuser;"
psql mydatabase -c "GRANT ALL ON ALL SEQUENCES IN SCHEMA public to dbuser;"
psql mydatabase -c "GRANT ALL ON ALL FUNCTIONS IN SCHEMA public to dbuser;"
One of the best documentation for opencv installation goes here: ( It takes several minutes to make and install ).
While installing, keep in mind that, you have to install it globally instead of installing it in any particular folder
https://docs.opencv.org/2.4/doc/tutorials/introduction/linux_install/linux_install.html
After installing that you will be able to include the header file opencv2/opencv.hpp
If you are facing any issues in importing them,
try finding the path in which opencv is installed
if it is in /usr/local/include/opencv4/
Then export the CPATH
export CPATH=/usr/local/include/opencv4/
Now the issue will be solved
sudo apt-get install build-essential
sudo apt-get install libsdl-image1.2 libsdl-image1.2-dev guile-2.0 \
guile-2.0-dev libsdl1.2debian libart-2.0-dev libaudiofile-dev \
libesd0-dev libdirectfb-dev libdirectfb-extra libfreetype6-dev \
libxext-dev x11proto-xext-dev libfreetype6 libaa1 libaa1-dev \
libslang2-dev libasound2 libasound2-dev
Download libgraph file from this link http://download.savannah.gnu.org/releases/libgraph/libgraph-1.0.2.tar.gz
Extract it and cd into it
./configure
make
sudo make install
sudo cp /usr/local/lib/libgraph.* /usr/lib
Now you will be able to use graphics.h library
But still might be getting error while using methods like initgraph(), etc. For that you have to include the header file while compiling also Like:
g++ filename.cpp -lgraph
Now you will be able to Use all those methods. There is a chance for unexpected abortion of the process, while running some programs. If you find any, raise an issue, along with the code and the obtained output :)
sudo apt-get install supervisor
sudo service supervisor restart
Now check where the configuration file is to be added
Open the config file of supervisor at /etc/supervisor/supervisord.conf
Look for a line like:
[include]
files = /etc/supervisor/conf.d/*.conf
It means all the .conf files inside that folder will be considered by supervisor.
Now add a new config file in that, for the new server
sudo nano /etc/supervisor/conf.d/project-name.conf
And in that file
[program:projectname]
command=/home/ubuntu/myprojenv/bin/gunicorn --workers 3 --bind 0.0.0.0:8001 myproject.wsgi
directory=/home/ubuntu/myproject
autostart=true
autorestart=true
stderr_logfile=/var/log/projectname.err.log
stdout_logfile=/var/log/projectname.out.log
This will create a new gunicorn process which runs the wsgi on 80001 port
Check the specified log files if required
The projectname specified will be used for further usages like starting, stopping or restarting the process.
After creating this file,bring these changes into effect:
sudo supervisorctl reread
sudo supervisorctl update
For verifying whether everything is fine:
ps ax | grep gunicorn
There might be several processes running, or go to 0.0.0.0:8001
You can also try
sudo supervisorctl status myproject
All set!!!
Now you can use
sudo supervisorctl start projectname
sudo supervisorctl stop projectname
sudo supervisorctl restart projectname
for managing the process
sudo apt-get update
sudo apt-get install wget software-properties-common
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key|sudo apt-key add -
sudo apt-add-repository "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-7 main"
sudo apt-get update
sudo apt-get install build-essential clang-7 lld-7 g++-7 cmake ninja-build libvulkan1 python python-pip python-dev python3-dev python3-pip libpng16-dev libtiff5-dev libjpeg-dev tzdata sed curl unzip autoconf libtool rsync
pip2 install --user setuptools
pip3 install --user setuptools
For Ubuntu 18.04, change libpng16-dev to libpng-dev from the previous example.
sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/lib/llvm-7/bin/clang++ 170
sudo update-alternatives --install /usr/bin/clang clang /usr/lib/llvm-7/bin/clang 170
Unreal Engine repositories are set to private. In order to gain access you need to add your GitHub username when you sign up at www.unrealengine.com. Download and compile Unreal Engine 4.22. Here we will assume you install it at ~/UnrealEngine_4.22, but you can install it anywhere, just replace the path where necessary.
git clone --depth=1 -b 4.22 https://github.com/EpicGames/UnrealEngine.git ~/UnrealEngine_4.22
cd ~/UnrealEngine_4.22
./Setup.sh && ./GenerateProjectFiles.sh && make
git clone https://github.com/carla-simulator/carla
Now you need to download the assets package,(note that this package is >3GB)
Optionally you can download aria2 (with sudo apt-get install aria2) so the following command will take advantage of it and will run quite faster.
./Update.sh
For CARLA to find your Unreal Engine's installation folder you need to set the following environment variable
export UE4_ROOT=~/UnrealEngine_4.22
Now that the environment is set up, you can use make to run different commands and build the different modules
make launch # Compiles the simulator and launches Unreal Engine's Editor.
make PythonAPI # Compiles the PythonAPI module necessary for running the Python examples.
make package # Compiles everything and creates a packaged version able to run without UE4 editor.
make help # Print all available commands.
For more info: https://carla.readthedocs.io/en/latest/how_to_build_on_linux/
Create a systemd service file
sudo nano /lib/systemd/system/hello_env.service
It should contain the following lines:
[Unit]
Description=hello_env.js - making your environment variables rad
Documentation=https://example.com
After=network.target
[Service]
Environment=NODE_PORT=3001
Type=simple
User=ubuntu
ExecStart=/usr/bin/node /home/ubuntu/server.js
Restart=on-failure
[Install]
WantedBy=multi-user.target
For more information about what these lines really mean, follow https://nodesource.com/blog/running-your-node-js-app-with-systemd-part-1/
Since we have changed the service files of systemd, we have to reload the daemon.
sudo systemctl daemon-reload
Now, for starting the service we added,
sudo systemctl start hello_env
Just like any other services,
sudo systemctl status hello_env # for getting the status
sudo systemctl stop hello_env # stop the service
sudo systemctl restart hello_env # restart the service
sudo systemctl enable hello_env # wont start immediately but will start once the system boots
sudo systemctl disable hell_env # similar to enable