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Configuring MySQL

From: PHP with MySQL Essential Training

Video: Configuring MySQL

Now that we have MySQL installed, and this week we're going to look at how we can configure MySQL. Specifically, there's two changes I want us to make. The first of those is I want us to add MySQL to our PATH. That's going to allow us to access MySQL from the command line inside Unix. We'll talk about what the PATH is and how to work with it in just a moment. The second change that I want us to make is I want us to set a root password for MySQL. By default, there is no password required to log into MySQL as the root user, that is the user with the most access privileges so its wide open by default.

Configuring MySQL

Now that we have MySQL installed, and this week we're going to look at how we can configure MySQL. Specifically, there's two changes I want us to make. The first of those is I want us to add MySQL to our PATH. That's going to allow us to access MySQL from the command line inside Unix. We'll talk about what the PATH is and how to work with it in just a moment. The second change that I want us to make is I want us to set a root password for MySQL. By default, there is no password required to log into MySQL as the root user, that is the user with the most access privileges so its wide open by default.

That's not a great security measure to have. Even though we're just on our local machine it's still a good idea to always go ahead and set a root password. To make sure that your database is locked down and only someone with that password has access to the data that's inside of them. So we're going to take care of those two things, and we can do those from the command line. So I'm going to open up terminal. And if you're in a new window, then you should already be in your user directory. You'll just want to make sure, pwd will tell you, and cd with that little tilde after it, will make sure that you're in that user directory, that's where we all want to be. So the first task is that we want to set up MySQL so that it's accessible from our PATH.

So now let's talk about what the path is and why it's important that we make this change. The path is a list of directories uses in order to locate programs on the machine that it can run. So for example, we have PHP installed and I can type which php. and it'll come back and tell me where it's located. It's in the directory user/bin, that's where it is. And user bin is in my PATH, it's one of the directories that Unix looks in to find programs. But MySQL is not in one of those, which mysql comes back if it didn't find it in any of the preset directories. So we have to add the directory where MySQL resides to that list. We can take a look at that list by just saying echo, dollar sign, all capital PATH.

This is a variable that contains a list of the directories it's going to check in with colons in between each one of those. So it's first going to look in user bin, bin and bin, bin and user s bin, then an s bin and then user local bin. And that's the order of priority. It's going to look in each of those directories until it finds the thing that we're looking for. So that's how it was able to find php. And it went through all of those and did not find MySQL, so we need to add our location for that. Now, where is MySQL located? Well the place that it installs it is going to be inside, I'll just type ls here, /user/local/mysql/bin.

That's the directory where it's located, I'm going to do a listing of that directory, and here it is, MySQL. There's also a lot of other little programs that installs along with it, but that's the program that we're looking for, MySQL. So what we need to do, is essentially add this, to this long list here. The way we can do that is by editing one of our bash configuration files. Bash is the environment that we're using in Unix. Don't worry too much about that. But if we type ls dash la from our user directory, you will see a list of the files thatb are used in the directory, and you'll see that I have one here called .bash_profile. You may or may not have this file.

I have it because I've done some configuration in here before. Don't worry about whether you have it or not, this is the file that we want. If you have one that's called .bashrc, that would work as an alternative. Bash profile it's a little simpler, if you don't know the difference between the two go ahead and just use bash underscore profile. If you have bashrc and know the difference then you can use that. Now in order to edit that file, I am just going to type nano.bash_profile that's going to work even if you don't have that file. Okay, so the nano.bash_profile is going to open it up in the nano text editor and you can see I have just got some basic configuration in here.

What we're going to want to do is add a new line to it that's going to say, export. And then, PATH without the dollar sign, equals, and then in double quotes I'm going to put dollar sign, PATH. That's going to echo back the value of PATH that we just saw. But before we echo it, we're also going to append to it, user/local/mysql/bin:. You see what I did? So it's basically saying the path now is going to be equal to this new directory, followed by whatever was previously set by the operating system.

I'm going to just add my new PATH to the front of it, so that's it. That's all there is to it, and we want to make sure that we export it, make sure that you spelled everything right, make sure you've got your quotes right. And then Ctrl+X to exit, Y to Save changes, and Return to accept the name. You can do cat .bash_profile, that's a Unix command that will just output it for us, so that we can see what it looks like. We see that it's there Now if we say echo dollar sign PATH, you'll see that its not listed there. That's because it's changes haven't taken effect. We can either close this terminal window and reopen it and they would take effect because it reads that dash profile every time it starts up.

Or the other way we can do it is just to say source .bash_profile, and that will read in that code. Now we'll do echo path and you'll see that now it has upended the beginning. So it's going to look in that place, we say which mysql, now it has located it, now it knows where MySQL is. And that's great because we want to use another program that's in that same folder to set the root password, and that's going to be the MySQL admin program. If we say which mysqladmin, you can see that it's located in that same spot.

So this is the program that lets us set passwords, among other things. Mysqladmin and the user we want to set it for is our root user. Root is the name of the sort of most powerful user on any Unix system, and it's true for MySQL as well. So, the root user, and we want to set a password. Now, we could put the password in quotes after it, but an even better practice is to just hit Return after this line, and it'll come up and ask me for my password. Now, there was no password set previously. I'm just setting a new password. It can be anything you want.

I'm going to type secret, SECRET, and it doesn't show what you're typing. Don't worry about that, that's a security measure. Hit Return, it asks me to type it again. I'm going to type secret again. And now it's set, now my password is there. If I try and run that command again you'll see it says oops, sorry you can't do that because did not provide a password. If you want to change your password, well, then you just need to provide the dash p option to that. And it'll come up and say, all right, give me your current password, SECRET, and the new password.

I'm going to make my new one John, Paul, George and Ringo. Type that again, John, Paul, George, Ringo. Okay, so now that's my new password. All lowercase, all run together. John Paul George Ringo is my new password. Now you can't see that, but you hopefully put in your own password anyway and not the same password as me. Now we can still access MySQL. We can still run the MySQL program from here. But we won't be able to access it remotely at all.

Only from the local computer. Only when we're sitting right here can we still get into the MySQL program. And it's important to still have access to MySQL in some way from this computer. Because that's going to allow us to reset the password if we ever lose it. And there are instructions on how to go about resetting a lost root password on the MySQL site. So if you ever lose it you can go to their site and they'll help you to get it reset. Okay, now that we've got our password set, we've completed the configuration of MySQL and we're ready to use it.

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This video is part of

Image for PHP with MySQL Essential Training
PHP with MySQL Essential Training

131 video lessons · 32828 viewers

Kevin Skoglund
Author

 
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  1. 4m 8s
    1. Welcome
      1m 0s
    2. Using the exercise files
      3m 8s
  2. 15m 6s
    1. What is PHP?
      3m 52s
    2. The history of PHP
      2m 51s
    3. Why choose PHP?
      4m 10s
    4. Installation overview
      4m 13s
  3. 54m 53s
    1. Overview
      2m 33s
    2. Working with Apache Web Server
      6m 56s
    3. Changing the document root
      7m 24s
    4. Enabling PHP
      6m 16s
    5. Upgrading PHP
      3m 30s
    6. Configuring PHP
      10m 3s
    7. Installing MySQL
      5m 46s
    8. Configuring MySQL
      7m 24s
    9. Text editor
      5m 1s
  4. 31m 25s
    1. Overview
      3m 27s
    2. Installing WampServer
      5m 46s
    3. Finding the document root
      2m 24s
    4. Configuring PHP
      8m 12s
    5. Configuring MySQL
      5m 45s
    6. Text editor
      5m 51s
  5. 19m 12s
    1. Embedding PHP code on a page
      6m 43s
    2. Outputting dynamic text
      5m 55s
    3. The operational trail
      2m 27s
    4. Inserting code comments
      4m 7s
  6. 1h 18m
    1. Variables
      7m 50s
    2. Strings
      4m 38s
    3. String functions
      8m 54s
    4. Numbers part one: Integers
      6m 27s
    5. Numbers part two: Floating points
      5m 25s
    6. Arrays
      10m 0s
    7. Associative arrays
      6m 37s
    8. Array functions
      6m 33s
    9. Booleans
      3m 50s
    10. NULL and empty
      5m 15s
    11. Type juggling and casting
      8m 27s
    12. Constants
      4m 43s
  7. 27m 37s
    1. If statements
      6m 0s
    2. Else and elseif statements
      4m 16s
    3. Logical operators
      7m 30s
    4. Switch statements
      9m 51s
  8. 42m 15s
    1. While loops
      8m 41s
    2. For loops
      5m 59s
    3. Foreach loops
      8m 16s
    4. Continue
      8m 28s
    5. Break
      4m 8s
    6. Understanding array pointers
      6m 43s
  9. 37m 25s
    1. Defining functions
      8m 25s
    2. Function arguments
      5m 32s
    3. Returning values from a function
      7m 33s
    4. Multiple return values
      4m 53s
    5. Scope and global variables
      6m 2s
    6. Setting default argument values
      5m 0s
  10. 20m 18s
    1. Common problems
      3m 47s
    2. Warnings and errors
      8m 36s
    3. Debugging and troubleshooting
      7m 55s
  11. 57m 57s
    1. Links and URLs
      5m 33s
    2. Using GET values
      5m 35s
    3. Encoding GET values
      8m 41s
    4. Encoding for HTML
      9m 26s
    5. Including and requiring files
      7m 40s
    6. Modifying headers
      6m 45s
    7. Page redirection
      6m 43s
    8. Output buffering
      7m 34s
  12. 1h 3m
    1. Building forms
      7m 28s
    2. Detecting form submissions
      5m 59s
    3. Single-page form processing
      7m 57s
    4. Validating form values
      10m 40s
    5. Problems with validation logic
      9m 54s
    6. Displaying validation errors
      7m 23s
    7. Custom validation functions
      6m 28s
    8. Single-page form with validations
      7m 25s
  13. 28m 5s
    1. Working with cookies
      2m 49s
    2. Setting cookie values
      5m 55s
    3. Reading cookie values
      6m 1s
    4. Unsetting cookie values
      4m 51s
    5. Working with sessions
      8m 29s
  14. 48m 39s
    1. MySQL introduction
      6m 43s
    2. Creating a database
      7m 41s
    3. Creating a database table
      7m 42s
    4. CRUD in MySQL
      5m 48s
    5. Populating a MySQL database
      7m 32s
    6. Relational database tables
      6m 40s
    7. Populating the relational table
      6m 33s
  15. 56m 4s
    1. Database APIs in PHP
      4m 51s
    2. Connecting to MySQL with PHP
      7m 45s
    3. Retrieving data from MySQL
      8m 47s
    4. Working with retrieved data
      6m 12s
    5. Creating records with PHP
      6m 58s
    6. Updating and deleting records with PHP
      9m 6s
    7. SQL injection
      3m 5s
    8. Escaping strings for MySQL
      6m 45s
    9. Introducing prepared statements
      2m 35s
  16. 35m 58s
    1. Blueprinting the application
      7m 19s
    2. Building the CMS database
      5m 14s
    3. Establishing your work area
      4m 38s
    4. Creating and styling the first page
      4m 22s
    5. Making page assets reusable
      6m 36s
    6. Connecting the application to the database
      7m 49s
  17. 32m 49s
    1. Adding pages to the navigation subjects
      5m 58s
    2. Refactoring the navigation
      6m 7s
    3. Selecting pages from the navigation
      6m 2s
    4. Highlighting the current page
      5m 26s
    5. Moving the navigation to a function
      9m 16s
  18. 1h 45m
    1. Finding a subject in the database
      9m 48s
    2. Refactoring the page selection
      10m 52s
    3. Creating a new subject form
      6m 55s
    4. Processing form values and adding subjects
      11m 20s
    5. Passing data in the session
      9m 16s
    6. Validating form values
      9m 40s
    7. Creating an edit subject form
      8m 30s
    8. Using single-page submission
      7m 44s
    9. Deleting a subject
      9m 44s
    10. Cleaning up
      10m 37s
    11. Assignment: Pages CRUD
      4m 30s
    12. Assignment results: Pages CRUD
      6m 10s
  19. 39m 26s
    1. The public appearance
      8m 52s
    2. Using a context for conditional code
      11m 37s
    3. Adding a default subject behavior
      6m 9s
    4. The public content area
      5m 51s
    5. Protecting page visibility
      6m 57s
  20. 1h 3m
    1. User authentication overview
      4m 3s
    2. Admin CRUD
      8m 41s
    3. Encrypting passwords
      7m 26s
    4. Salting passwords
      5m 42s
    5. Adding password encryption to CMS
      11m 54s
    6. New PHP password functions
      3m 13s
    7. Creating a login system
      11m 28s
    8. Checking for authorization
      5m 48s
    9. Creating a logout page
      5m 40s
  21. 2m 4s
    1. Next steps
      2m 4s

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