![]() Sudo nano /boot/config.txtAdd and display_lcd_rotate=3 so that the end of config.txt looks like this: ĭpi_timings=480 0 10 16 59 800 0 15 113 15 0 0 0 60 0 32000000 6 Hyperpixel-rotate leftIgnore the error message. Install the HyperPixel 4 drivers: curl | bashĬhoose option 1, Pi 4 with rectangular screen Note, I'm using a wired Ethernet connection.Īdd an empty ssh file under /boot to enable ssh Here are a couple of commands that come in handy though when working with startup scripts.After 3 days and 1 broken screen, I finally got the HyperPixel working on a Pi 4 with Repetier-Server. There are lots of commands that you can use to manage your application’s lifecycle, which are described in the PM2 documentation. We’ve just scratched the surface of what PM2 can do. You can repeat the steps above for each Node.js application that you’d like to automatically start when the Raspberry Pi boots. After saving the process, PM2 will be able to run it using the pm2 resurrect command that was setup in the previous step.Īnd that’s it - you’re done! Your application will now start running whenever your Pi boots up. In your terminal, run the command pm2 save in order to save the currently running process for the application. Save Application Process to Run it With PM2 ResurrectĪfter completing the steps above, there’s just one more thing that you need to do in order to use PM2 to automatically start your application when the Pi boots up. When this command runs, it will load any PM2 processes (such as your application thread) that you have saved, which is what starts the application on boot. The command will look similar to the following: ExecStart=/home/pi/.nvm/versions/node/v14.15.1/lib/node_modules/pm2/bin/pm2 resurrect On a Raspberry Pi, it will be located at /etc/systemd/system/rvice and it contains an ExecStart command that tells the Pi to run the pm2 resurrect command on boot. Make sure that you run this command in your terminal.Īs part of completing this step, PM2 will generate a file that’s executed when the system starts. It adds a script to the $PATH that will start PM2 as the current user for the detected init system. The second piece of data in the output is a command that needs to be copy/pasted into the terminal and run. PM2 abstracts away the need to know the differences between init systems it handles that for you. The way that these two init systems are implemented differs, but they both handle the same two tasks: booting the system and loading and maintaining services. On a Raspberry Pi, the init system found by PM2 will be systemd. The first piece of data in the output is the init system that PM2 found, which is launchd in my case. The example above is the output from running the pm2 startup command on my Mac. You should see something like this in your terminal: The commands above will start your application using PM2, which allows you to then control them with PM2. For example, if you’ve defined a custom script in your package.json file called readSensors, you would run pm2 start npm - run readSensors. To start a script defined in the package.json file for your application, you can use this command, pm2 start npm - run.To start a file, you can use this command, pm2 start index.js, where index.js is the path to the file that you want to run.Then, choose the appropriate command from the two options below: To do this, navigate to the application folder in the terminal. The first step is to start the application using PM2. Using PM2 to Start a Node.js Application on Boot Running the Application with PM2 The -g means that the package will be installed globally on the Pi. The PM2 CLI can be installed using npm by running the following in your terminal: npm install pm2 -g It has great documentation and is quick to get started with, which is why I’ve chosen to use it for a number of my applications. PM2 is a popular process manager that offers all of the features above and then some. ![]() This includes things like startup scripts, deployment management, logging, monitoring, hot reloading, and more. Process managers let you control the lifecycle of your application by providing a means to manage common tasks needed to keep your application running. PM2, which stands for Process Manager 2, is a process manager for Node.js applications. While doable, this step can be automated by configuring the application to run when the Pi boots by using a process manager called PM2. What happens when you need to reboot the Pi or if it temporarily loses power though? You have to manually go through the steps above again to get your application running.
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