{"id":47096,"date":"2023-11-27T12:30:00","date_gmt":"2023-11-27T18:30:00","guid":{"rendered":"https:\/\/www.rosehosting.com\/blog\/?p=47096"},"modified":"2023-10-24T03:42:37","modified_gmt":"2023-10-24T08:42:37","slug":"how-to-install-flask-on-debian-12","status":"publish","type":"post","link":"https:\/\/www.rosehosting.com\/blog\/how-to-install-flask-on-debian-12\/","title":{"rendered":"How to Install Flask on Debian 12"},"content":{"rendered":"<div id=\"bsf_rt_marker\"><\/div>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2023\/10\/how-to-install-flask-on-debian-12.webp\" alt=\"how to install flask on debian 12\" class=\"wp-image-47173\" srcset=\"https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2023\/10\/how-to-install-flask-on-debian-12.webp 1024w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2023\/10\/how-to-install-flask-on-debian-12-300x169.webp 300w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2023\/10\/how-to-install-flask-on-debian-12-150x84.webp 150w, https:\/\/www.rosehosting.com\/blog\/wp-content\/uploads\/2023\/10\/how-to-install-flask-on-debian-12-768x432.webp 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>Flask is a lightweight micro web framework for Python. Its simplicity and flexibility make it an excellent choice for building anything from small personal projects to complex, production-ready web applications. In this guide, we&#8217;ll walk you through the process of how to install Flask on Debian 12.<\/p>\n\n\n\n<!--more-->\n\n\n\n<p>Flask depends on the Werkzeug WSGI toolkit, the Jinja template engine, and the Click CLI toolkit. Whether you&#8217;re a seasoned developer or just starting your web development journey, we&#8217;ll provide you with clear and easy-to-follow steps to ensure you have Flask up and running in no time.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-662aeef1a1e2d\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"ez-toc-cssicon\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-662aeef1a1e2d\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-install-flask-on-debian-12\/#Prerequisites\" title=\"Prerequisites\">Prerequisites<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-install-flask-on-debian-12\/#Step-1-Log-in-via-SSH\" title=\"Step 1. Log in via SSH\">Step 1. Log in via SSH<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-install-flask-on-debian-12\/#Step-2-Install-Python-Packages-and-Create-a-Virtual-Environment\" title=\"Step 2. Install Python Packages and Create a Virtual Environment \">Step 2. Install Python Packages and Create a Virtual Environment <\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-install-flask-on-debian-12\/#Step-3-Install-Flask-on-Debian-12\" title=\"Step 3. Install Flask on Debian 12\">Step 3. Install Flask on Debian 12<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-install-flask-on-debian-12\/#Running-a-Simple-Flask-Application\" title=\"Running a Simple Flask Application\">Running a Simple Flask Application<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Prerequisites\"><\/span>Prerequisites<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul>\n<li>A <a href=\"https:\/\/www.rosehosting.com\/debian-hosting\/\">Debian 12 VPS<\/a><\/li>\n<\/ul>\n\n\n\n<ul>\n<li>SSH access to the root user or a regular system user with sudo privileges<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step-1-Log-in-via-SSH\"><\/span>Step 1. Log in via SSH<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Let\u2019s log in to your Debian 12 VPS with SSH. You can log in as a root user, or as a regular user with sudo privileges.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ssh root@IP_Address -p Port_number<\/code><\/pre>\n\n\n\n<p>If you cannot log in as root, remember to replace \u201croot\u201d with a user that has sudo privileges. Additionally, replace the \u201cIP_Address\u201d and \u201cPort_Number\u201d with your server\u2019s respective IP address and SSH port.<\/p>\n\n\n\n<p>Once logged in, update the package repository files on the system with the command:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># apt update<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step-2-Install-Python-Packages-and-Create-a-Virtual-Environment\"><\/span>Step 2. Install Python Packages and Create a Virtual Environment <span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Debian 12 comes with Python version 3.11 installed by default &#8211; you can check this with the command:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># python --version\nPython 3.11.2<\/code><\/pre>\n\n\n\n<p>Now you can install the required packages python3-pip and python3-venv with the command:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># apt install python3-venv python3-pip<\/code><\/pre>\n\n\n\n<p>You can install Flask globally with the command pip3 install flask, but it&#8217;s recommended to create a virtual environment and install the Flask application there.<\/p>\n\n\n\n<p>Let&#8217;s create a new user and install the Flask application in a new virtual environment:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#  adduser john<\/code><\/pre>\n\n\n\n<p>Now, you can log in as the user john with the above command. After logging in, create the directories flaskapp\/templates:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># su - john\n$ mkdir -p flaskapp\/templates<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step-3-Install-Flask-on-Debian-12\"><\/span>Step 3. Install Flask on Debian 12<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Enter the directory called <strong>flaskapp<\/strong> &#8211; you can now go ahead and create the virtual environment.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$ cd flaskapp\n$ python3 -m venv virtualenv<\/code><\/pre>\n\n\n\n<p>Now enter the virtual environment with:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># source virtualenv\/bin\/activate<\/code><\/pre>\n\n\n\n<p>You have now activated the virtual environment, where we can start our installation. Let&#8217;s install Flask and Gunicorn:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(virtualenv) john@debian12$ pip3 install flask gunicorn<\/code><\/pre>\n\n\n\n<p>After the installation is completed, you should receive a similar output:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Successfully installed Jinja2-3.1.2 MarkupSafe-2.1.3 Werkzeug-3.0.0 blinker-1.6.3 click-8.1.7 flask-3.0.0 gunicorn-21.2.0 itsdangerous-2.1.2 packaging-23.2<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Running-a-Simple-Flask-Application\"><\/span>Running a Simple Flask Application<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Once Flask is installed, you can run a simple application to test if everything is working as expected. Make sure you are logged in as the user &#8220;john&#8221;. Create an <strong>app.py<\/strong> file using your preferred text editor:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(virtualenv) john@debian12 ~\/flas$ nano simpleapp.py <\/code><\/pre>\n\n\n\n<p>Add the following code to the file:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from flask import Flask\n\napp = Flask(__name__)\n\n@app.route('\/')\ndef hello():\n    return 'Hello, World!'\n\nif __name__ == '__main__':\n    app.run()<\/code><\/pre>\n\n\n\n<p>Save and close the file. You can now run this example program:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>flask run &amp; <\/code><\/pre>\n\n\n\n<p>The application will continue running in the background listening on port 5000.<\/p>\n\n\n\n<p>You can check the output of the program with this quick command:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>curl http:\/\/127.0.0.1:5000<\/code><\/pre>\n\n\n\n<p>You should get the following output:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>127.0.0.1 - - &#91;13\/Oct\/2023 08:14:17] \"GET \/ HTTP\/1.1\" 200 -\nHello, World!<\/code><\/pre>\n\n\n\n<p>Congratulations! You have successfully installed Flask on Debian 12. You can now use Flask to run your programs and develop software. <\/p>\n\n\n\n<p>Of course, you don\u2019t have to know how to install Flask on Debian 12 if you use one of our <a href=\"https:\/\/www.rosehosting.com\/debian-hosting\/\">Debian VPS Hosting<\/a> services, in which case you can simply ask our expert Linux admins to set up Flask on Debian 12 VPS for you. They are available 24\/7 and will take care of your request immediately.<\/p>\n\n\n\n<p>PS. If you liked this post on how to set up Flask on Debian 12, please share it with your friends on social networks or simply leave a reply in the comments section. Thanks.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Flask is a lightweight micro web framework for Python. Its simplicity and flexibility make it an excellent choice for building &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"How to Install Flask on Debian 12\" class=\"read-more button\" href=\"https:\/\/www.rosehosting.com\/blog\/how-to-install-flask-on-debian-12\/#more-47096\" aria-label=\"Read more about How to Install Flask on Debian 12\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":47173,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1700,13,1712],"tags":[48,1985],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Install Flask on Debian 12 - RoseHosting<\/title>\n<meta name=\"description\" content=\"Planning on running Flask applications? 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