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 From the output of the ps aux | grep node command, it looks like the Node.js process is running as the root user. This means you need to ensure that the root user has the appropriate permissions to write to the directory where you want to save files.

Steps to Set Up Directory Permissions

1. Create the Directory for Images

   If you haven’t already created the directory for images, you can do so with the following command:

   bash
   sudo mkdir -p /var/www/images
   

2. Set Ownership to Root

   Since your Node.js process runs as the root user, you can set the ownership of the directory to root:

   bash
   sudo chown -R root:root /var/www/images
   

3. Set Permissions

   Set the permissions to allow reading, writing, and executing for the owner (root) and reading and executing for others:

   bash
   sudo chmod -R 755 /var/www/images
   

Summary of Commands

1. Create the Directory

   bash
   sudo mkdir -p /var/www/images
   

2. Change Ownership

   bash
   sudo chown -R root:root /var/www/images
   

3. Set Permissions

   bash
   sudo chmod -R 755 /var/www/images
   

Considerations for Production

Running Node.js processes as the root user is not recommended for production environments due to security risks. It’s better to run your Node.js application under a dedicated user account with limited permissions. If you plan to move to a more secure setup, consider creating a separate user for your application.

To create a new user and run your Node.js process under that user:

1. Create a New User

   bash
   sudo adduser nodeapp
   

2. Change Ownership of the Directory

   bash
   sudo chown -R nodeapp:nodeapp /var/www/images
   

3. Update Your Application to Run as the New User

   You would need to update the startup scripts or process manager configuration to run the application under the nodeapp user. For example, if using pm2, you can set the user in the ecosystem.config.js file or the pm2 start command.

Example Using pm2

If you are using pm2 to manage your application, you can start the application under a different user:

1. Install pm2 (if not already installed)

   bash
   sudo npm install -g pm2
   

2. Start Your Application with pm2

   bash
   pm2 start index.js --name "my-app" --user nodeapp
   

This way, the nodeapp user will run your Node.js process, and you can manage permissions and security more effectively.