Update installation dependencies

Introduction to Magento installation dependencies

We now use Composer to resolve dependencies before you install the Magento software and extensions.

Composer is a separate application that manages PHP dependencies. Before you can install the Magento software, you must perform the following tasks in the order shown:

  1. Install the Composer software.
  2. Create the Magento file system owner so Composer writes files to the web server docroot as the correct user.
  3. Run the composer install command from your Magento root directory (for example, /var/www/magento2/).

    The Magento root directory is a subdirectory of your web server’s docroot. Need help locating the docroot? Click here.

    If the following error displays, see troubleshooting:

    file_get_contents(app/etc/NonComposerComponentRegistration.php): failed to open stream: No such file or directory

For you to be able to run the Magento application, make sure you perform all tasks as a user with privileges to write to the web server docroot. One way to do this is to log in as or switch to the >switch to the Magento file system owner.

Run composer install to update dependencies

Update installation dependencies as follows:

  1. Log in to your Magento server as the Magento file system owner or switch to that user.
  2. Change to the Magento installation directory and run composer install. Examples:

    CentOS:

    cd /var/www/html/magento2 && composer install
    

    Ubuntu:

    cd /var/www/magento2 && composer install
    

    This command updates package dependencies and can take a few minutes to complete.

    The following error might display:

    [Composer\Downloader\TransportException]
        The "https://repo.magento.com/archives/magento/composer/magento-composer-1.0.2.0.zip" file could not be downloaded (HTTP/1.1 404 Not Found)
    

    If so, create auth.json in the Magento file system owner’s <home>/.composer directory and run composer install again.

Set pre-installation file system ownership and permissions

This topic discusses how to set read-write permissions for the web server group before you install the Magento software. This is necessary so the Setup Wizard or command line can write files to the Magento file system.

The procedure you use is different, depending on whether you use shared hosting and have one user or if you use a private server and have two users.

If you're using a Magento version earlier than 2.0.6, see Appendix—Magento file system ownership and appendix (legacy) instead.

Set permissions for shared hosting (one user)

This section discusses how to set pre-installation permissions if you log in to the Magento server as the same user that also runs the web server. This type of setup is common in shared hosting environments.

To set ownership and permissions for a one-user system:

To set permissions before you install the Magento software:

  1. Log in to your Magento server.
  2. Use a file manager application provided by your shared hosting provider to verify write permissions are set on the following directories:

    • vendor (Composer or compressed archive installation)
    • app/etc
    • pub/static
    • var
    • Any other static resources
  3. If you have command-line access, enter the following commands in the order shown:

    cd <your Magento install dir>
    find var vendor pub/static pub/media app/etc -type f -exec chmod u+w {} \;
    find var vendor pub/static pub/media app/etc -type d -exec chmod u+w {} \;
    chmod u+x bin/magento
    

    To optionally enter all commands on one line, enter the following assuming Magento is installed in /var/www/html/magento2:

    cd /var/www/html/magento2 && find var vendor pub/static pub/media app/etc -type f -exec chmod u+w {} \; && find var vendor pub/static pub/media app/etc -type d -exec chmod u+w {} \; && chmod u+x bin/magento
    
  4. If you haven’t done so already, get the Magento software in one of the following ways:

  5. After you have set file system ownership and permissions, continue with any of the following:

To further restrict permissions after installing the Magento software, you configure a Magento umask.

Set ownership and permissions for two users

This section discusses how to set ownership and permissions for your own server or a private hosting setup. In this type of setup, you typically cannot log in as, or switch to, the web server user. You typically log in as one user and run the web server as a different user.

To set ownership and permissions for a two-user system:

Complete the following tasks in the order shown:

About the shared group

To enable the web server to write files and directories in the Magento file system but to also maintain ownership by the Magento file system owner, both users must be in the same group. This is necessary so both users can share access to Magento files (including files created using the Magento Admin or other web-based utilities).

This section discusses how to create a new Magento file system owner and put that user in the web server’s group. You can use an existing user account if you wish; we recommend the user have a strong password for security reasons.

Skip to step 2 if you plan on using an existing user account.

Step 1: Create the Magento file system owner and give the user a strong password

This section discusses how to create the Magento file system owner. (Magento file system owner is another term for the command-line user.)

To create a user on CentOS or Ubuntu, enter the following command as a user with root privileges:

adduser <username>

To give the user a password, enter the following command as a user with root privileges:

passwd <username>

Follow the prompts on your screen to create a password for the user.

If you don't have root privileges on your Magento server, you can use another local user account. Make sure the user has a strong password and continue with Put the Magento file system owner in the web server group.

For example, to create a user named magento_user and give the user a password, enter:

sudo adduser magento_user
sudo passwd magento_user

Because the point of creating this user is to provide added security, make sure you create a strong password.

Step 2: Find the web server user’s group

To find the web server user’s group:

  • CentOS: egrep -i '^user|^group' /etc/httpd/conf/httpd.conf

    Typically, the user and group name are both apache

  • Ubuntu: ps aux | grep apache to find the apache user, then groups <apache user> to find the group

    Typically, the user name and the group name are both www-data

Step 3: Put the Magento file system owner in the web server’s group

To put the Magento file system owner in the web server’s group (assuming the typical Apache group name for CentOS and Ubuntu), enter the following command as a user with root privileges:

  • CentOS: usermod -a -G apache <username>
  • Ubuntu: usermod -a -G www-data <username>

The -a -G options are important because they add apache or www-data as a secondary group to the user account, which preserves the user’s primary group. Adding a secondary group to a user account helps restrict file ownership and permissions to ensure members of a shared group only have access to certain files.

For example, to add apache as a secondary group to user magento_user on CentOS:

sudo usermod -a -G apache magento_user

To confirm your Magento user is a member of the web server group, enter the following command:

groups magento_user

The following sample result shows the user’s primary (magento) and secondary (apache) groups.

magento_user : magento_user apache

Typically, the user name and primary group name are the same.

To complete the task, restart the web server:

  • Ubuntu: service apache2 restart
  • CentOS: service httpd restart

Step 4: Get the Magento software

If you haven’t done so already, get the Magento software in one of the following ways:

Step 5: Set ownership and permissions for the shared group

To set ownership and permissions before you install the Magento software:

  1. Log in to your Magento server as, or switch to, the Magento file system owner.
  2. Enter the following commands in the order shown:

    cd <your Magento install dir>
    find var vendor pub/static pub/media app/etc -type f -exec chmod g+w {} \;
    find var vendor pub/static pub/media app/etc -type d -exec chmod g+ws {} \;
    sudo chown -R :<web server group> .
    chmod u+x bin/magento
    

To optionally enter all commands on one line, enter the following assuming Magento is installed in /var/www/html/magento2 and the web server group name is apache:

cd /var/www/html/magento2 && find var vendor pub/static pub/media app/etc -type f -exec chmod g+w {} \; && find var vendor pub/static pub/media app/etc -type d -exec chmod g+ws {} \; && chown -R :apache . && chmod u+x bin/magento

In the event file system permissions are set improperly and can’t be changed by the Magento file system owner, you can enter the command as a user with root privileges:

cd /var/www/html/magento2 && sudo find var vendor pub/static pub/media app/etc -type f -exec chmod g+w {} \; && sudo find var vendor pub/static pub/media app/etc -type d -exec chmod g+ws {} \; && sudo chown -R :apache . && sudo chmod u+x bin/magento

Next step

After you have set file system ownership and permissions, continue with any of the following:

Switch to the Magento file system owner

After you’ve performed the other tasks in this topic, enter one of the following commands to switch to that user:

  • Ubuntu: su <username>
  • CentOS: su - <username>

For example,

su magento_user

Next step

Install the Magento software: