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System configuration

Adding a 'drubs' user

At this time, the best way that we've found to manage connecting to, and managing Drupal sites on remote nodes using Drubs, is to create and configure a 'drubs' user.

CentOS 7

Execute the following as root:

# Create the user.
useradd drubs

# Assign 'apache' user to the 'drubs' group.
usermod -a -G drubs apache

# Setup ssh keys for the 'drubs' user.
su drubs
ssh-keygen -t rsa -C "drubs@<hostname>"
# Go back to being 'root'.

# Add public keys from other nodes which will be used to trigger builds on this
# node, to the 'drubs' user's 'authorized_keys' file.

# Make sure the 'drubs' user account is locked.
passwd -l drubs

At this point, you should be able to ssh to this node as 'drubs' from other nodes which will be used to trigger builds on this node - without password, using ssh keys.

You may need to modify the login access control table located at /etc/security/access.conf to allow the 'drubs' user to login. Generally this involves editing this file and adding an entry for 'drubs' similar to the other entries that will be present.

Finally, set the 'apache' user's umask, such that files created by Drupal in sites/default/files have sufficient permissions to be deleted upon site rebuild, etc:

# Set apache umask.
mkdir /etc/systemd/system/httpd.service.d
printf "[Service]\nUMask=0002" >> /etc/systemd/system/httpd.service.d/umask.conf

# Reboot the server.

Configuring Apache

Setting AccessFileName

In order to reliably disable access to a site during the process of building (installing or updating) a site, Drubs places an additional configuration file in the site's root directory, and later removes it. To take advantage of this feature, you should set AccessFileName in 'httpd.conf' to:

AccessFileName .htaccess.drubs .htaccess

If the AccessFileName directive is already set, modify it as above; otherwise you may need to add it.

If you do not set this directive, and do not make other provision to take the site offline during build, be aware that users may see a broken or partially- built site, and may be able to interact with it while it is being built, in ways which may cause the build to fail.

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