teaching machines

CS 347: Webdev Blog

August 31, 2020 by Chris Johnson. Filed under
Deprecated: Creation of dynamic property WP_Term::$cat_ID is deprecated in /var/www/twodee/blog/wp-includes/category.php on line 378

Deprecated: Creation of dynamic property WP_Term::$category_count is deprecated in /var/www/twodee/blog/wp-includes/category.php on line 379

Deprecated: Creation of dynamic property WP_Term::$category_description is deprecated in /var/www/twodee/blog/wp-includes/category.php on line 380

Deprecated: Creation of dynamic property WP_Term::$cat_name is deprecated in /var/www/twodee/blog/wp-includes/category.php on line 381

Deprecated: Creation of dynamic property WP_Term::$category_nicename is deprecated in /var/www/twodee/blog/wp-includes/category.php on line 382

Deprecated: Creation of dynamic property WP_Term::$category_parent is deprecated in /var/www/twodee/blog/wp-includes/category.php on line 383

Deprecated: Creation of dynamic property WP_Term::$cat_ID is deprecated in /var/www/twodee/blog/wp-includes/category.php on line 378

Deprecated: Creation of dynamic property WP_Term::$category_count is deprecated in /var/www/twodee/blog/wp-includes/category.php on line 379

Deprecated: Creation of dynamic property WP_Term::$category_description is deprecated in /var/www/twodee/blog/wp-includes/category.php on line 380

Deprecated: Creation of dynamic property WP_Term::$cat_name is deprecated in /var/www/twodee/blog/wp-includes/category.php on line 381

Deprecated: Creation of dynamic property WP_Term::$category_nicename is deprecated in /var/www/twodee/blog/wp-includes/category.php on line 382

Deprecated: Creation of dynamic property WP_Term::$category_parent is deprecated in /var/www/twodee/blog/wp-includes/category.php on line 383

Deprecated: Creation of dynamic property WP_Term::$cat_ID is deprecated in /var/www/twodee/blog/wp-includes/category.php on line 378

Deprecated: Creation of dynamic property WP_Term::$category_count is deprecated in /var/www/twodee/blog/wp-includes/category.php on line 379

Deprecated: Creation of dynamic property WP_Term::$category_description is deprecated in /var/www/twodee/blog/wp-includes/category.php on line 380

Deprecated: Creation of dynamic property WP_Term::$cat_name is deprecated in /var/www/twodee/blog/wp-includes/category.php on line 381

Deprecated: Creation of dynamic property WP_Term::$category_nicename is deprecated in /var/www/twodee/blog/wp-includes/category.php on line 382

Deprecated: Creation of dynamic property WP_Term::$category_parent is deprecated in /var/www/twodee/blog/wp-includes/category.php on line 383
fall-2020, specifications, webdev.

This semester you will document your learning of web development in a blog that you serve out via the Apache web server. Each week you will write a short entry responding to some articles you’ve read or videos you watched on some aspect of HTML, CSS, JavaScript, or web development in general about which you are curious. Use external source material, not the videos or posts from your instructor.

Each post that you write consists of the following:

• two or more paragraphs of your own text summarizing what you learned
• sample code relevant to the source material
• links or references to your sources

Add a link to each new post in your blog’s index.html file. Make sure your instructor can see the links to all of your posts upon visiting http://YOUR-IP-ADDRESS:8000.

If an entry meets all the requirements, you will receive 2 points. If you meet some, you will receive 1 point. If your blog post is not visible on Friday, when your instructor reads through all posts, you will receive 0 points.

You are encouraged to write this blog and test it on your local machine and publish it to your web server when it’s ready. The remainder of this document describes how to set up a standard workflow for developing and deploying websites that uses Visual Studio Code, Git, and Apache.

Install Git

Follow these directions to install Git or see if you already have it installed. Do not install GitHub Desktop. We only need the core Git, which is a set of command-line tools that we will run with the help of Visual Studio Code.

Create Local Repository

Follow these steps to set up a folder on your local machine in which you can construct, modify, and test your site without having to deal with an internet connection and a web server.

• Create an empty folder on your local computer. Name it blog perhaps.
• Open the folder in Visual Studio Code.
• Create a file named index.html and enter some simple HTML.
• In the Source Control panel—which you can reach via View / SCM or the button in the activity bar on the left—click Initialize Repository. A Git repository is essentially a database storing versions of files. You now have a local Git repository hidden in this directory in the .git folder. Your original folder is called the working directory. You must migrate changes from your working directory to the repository using two Git commands.
• The first command is to stage or add modified files to a staging area. Click the + icon next index.html to stage its changes.
• The second command is to commit all staged changed changes to the local repository. Enter a commit message in the text box and click the checkmark button labeled Commit at the top of the panel.

Your changes are now recorded to your local Git repository. Next we mirror those changes on a version of our repository hosted by a remote Git provider.

Create Remote Repository

Follow these steps to create a centralized version of your repository that you can access from your local machine and from your webserver.

• Create a new Git repository on GitHub, GitLab, Bitbucket, or some other Git provider of your choosing.
• Copy the URL of your repository (which probably has the form https://YOUR-PROVIDER/YOUR-USERNAME/YOUR-REPOSITORY-NAME).
• Back in Visual Studio Code, click the ⋯ button at the top the Source Control panel, and select Remote / Add Remote…
• Enter the URL of your remote repository.
• Name the remote connection origin.
• Push your local version of the repository up to the remote version. Click ⋯ and select Pull, Push / Push. Confirm the connection to an upstream branch.
• Reload the browser page showing your repository. You should see your index.html.

Clone on Droplet

Follow these steps to pull the centralized version of your repository down onto your droplet.

• Log in to your droplet using your non-root account.
• While in your home directory, clone your remote repository using this command:

  git clone https://YOUR-PROVIDER/YOUR-USERNAME/YOUR-REPOSITORY-NAME

• Confirm that index.html is in the directory with these commands:

  cd YOUR-REPOSITORY-NAME
  ls

Configure Apache

Follow these steps to share the working directory of this new clone with the world via the Apache web server.

• Create a configuration file that tells Apache about your blog. You will need to create a file using a command-line text editor. Two of the most popular text editors are vi and emacs. You are encouraged to learn one of them. You may be intimidated or disgusted by the prospect of command-line editing. It’s okay to feel that way. However, the benefits of knowing one of these editors outweigh the costs. Create the file with one of the following commands:

  sudo vi /etc/apache2/sites-available/blog.conf
  sudo emacs /etc/apache2/sites-available/blog.conf

  Other editors are fine too.
• Add the following text to the file, replacing YOUR-REPOSITORY-NAME and YOUR-USERNAME with their actual values:

  Listen 8000
  
  <VirtualHost *:8000>
    ServerAdmin webmaster@localhost
    DocumentRoot /home/YOUR-USERNAME/YOUR-REPOSITORY-NAME
  
    # Allow access to all files.
    <Directory /home/YOUR-USERNAME/YOUR-REPOSITORY-NAME>
      Require all granted
    </Directory>
  
    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined
  </VirtualHost>

  This configuration serves the directory out on port 8000. Normally we serve out HTTP on port 80, but we want to use that for something else later in the semester. Save the file and exit the editor.
• Enable the site and restart Apache with these commands:

  sudo a2ensite blog
  sudo service apache2 restart

• Visit http://YOUR-IP-ADDRESS:8000 in a browser and marvel at your accomplishment. Your website is live! Maybe?
• If you see a Forbidden error, give the directory and all of its children (recursive with -R) permissions so that the Apache server, which runs as a different user, can read them. You add read (r) and execute (capital X) permissions to the group (g) and others (o) with this command:

  chmod -R go+rX ~/YOUR-REPOSITORY-NAME

  If you still see a Forbidden error, double-check your paths in your blog.conf file. Run pwd from your working directory to get the full path that you should be using. If you make changes to blog.conf, restart Apache.
• Send your instructor a link to your blog in a direct message in Slack.

Weekly Workflow

Many of the steps above are needed only for your initial one-time setup. Each week, follow this much simpler workflow:

• Open your blog’s working directory in Visual Studio Code.
• Pull down any changes that you’ve pushed from other computers. Click ⋯ at the top of the Source Control panel and select Pull, Push / Pull. If you aren’t making changes on any other computers, then you can skip this step.
• Add a new HTML page for the week’s entry, and insert and test your desired content.
• Add a link to your new page in index.html.
• Stage and commit the changes.
• Push the commits from your local machine to your Git provider. This step is easy to forget because there’s no UI telling you that your local and remote repositories are not in sync. Do not forget.
• Log in to your droplet and run the following commands:

  cd YOUR-REPOSITORY-NAME
  git pull

• Verify that your new entry is visible by visiting your site in a browser.