The Debian Stretch repositories provide HAProxy version 1.7. You may want or need features in newer versions. Fortunately, installing HAProxy 1.9.7 from source is relatively straightforward. The steps to do so are: Install required packages Download the HAProxy source code Compile and install HAProxy Create an unprivileged service account Create a SystemD unit file Create… Read More »
The CentOS 7 repositories provide HAProxy version 1.5. You may want or need features in newer versions. Fortunately, installing HAProxy 1.9.7 from source is relatively straightforward. The steps to do so are: Install required packages Download the Lua source code Download the HAProxy source code Compile and install Lua Compile and install HAProxy Create an… Read More »
I have been in the computing industry for almost 15 years. In this time, I have encountered enough anecdotes where I am comfortable with the claim: A lot of people don’t like their IT department. There is even a Forbes article about people hating IT. I work in my company’s IT department back office as… Read More »
Checking disk space in Linux can done with the command line progams df and du. df is used to show usage at the filesystem level, while du can be used to show how much space individual files and directories use. If you aren’t familiar with how Linux presents storage devices, you will probably want to… Read More »
Unlike Windows, Linux doesn’t use drive letters to distinguish storage devices. It uses a single hierarchy starting at /. Storage devices are associated with directories within this hierarchy through a process called mounting. I’ll cover mounting and mount points more later on. The term Linux filesystem hierarchy refers to this tree structure. The Root Directory… Read More »
The OpenLDAP referential integrity overlay is used to keep attributes that refer to the DNs of other entries consistent when changes occur. If you are trying to make groups more manageable, consider using the memberOf overlay. The referential integrity overlay will automatically modify or remove attributes if the entry they refer to is renamed or… Read More »
My OpenLDAP Online Configuration (OLC) Reference provides the OLC equivalents of the configuration file options. It should be pretty accurate as I read the source code to determine which OLC attributes correspond to the configuration file options. For a description of what the various options do, consult the appropriate man page or the official Administrator’s… Read More »
The OpenLDAP memberOf overlay automatically creates and removes attributes when attributes of other entries that refer to their DN are added and removed. That statement, while technically accurate, was confusing to me and I wrote it! For example, if you create a groupOfNames entry with a member attribute of uid=user,ou=users,dc=tylersguides,dc=com, the memberOf overlay can automatically… Read More »
Mounting a Windows share on Linux is pretty straight forward. You need a Windows user that can access the shares, the name of the work group or domain, and the name of the share. First, make sure you have mount.cifs installed, then create a credentials file, and finally mount the share. You can also add… Read More »
How the hostname is set is operating system specific. This is because the hostname is typically set by the startup process, and different operating systems have different startup processes. CentOS is no different. CentOS 7 uses systemd, while CentOS 6 uses upstart. This means how to change the hostname in CentOS depends on which major… Read More »