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Enhance install_packages with Docker installation and validation. Add checks for Docker binary, service status, and functionality. Include DNS check for download.docker.com and update repository URL to https://download.docker.com/.
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Update manage_install to include checks for required packages and Docker before installing panel, node, or panel+node. Ensure install_packages is called if checks fail, with proper error handling and translations.
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Introduced a check in the open_panel_access function to verify if port 8443 is already in use before attempting to open it with ufw. Uses ss or netstat to detect listening processes, exiting with an error if the port is occupied to prevent conflicts.
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Resolved an issue in the update_current_certificates function where the script incorrectly reported successful certificate updates despite Let's Encrypt rate limit errors (5 attempts exceeded). Added exit code checking for certbot renew and updated status logic to accurately reflect failures, including rate limit errors