A block devices is usually a physical device that’s used for storing data, e.g. Hard drives and solid state drives. A partition is basically a way to organise a block device’s storage into smaller segments, that means creating partitions allows you to use a percentage of your block device’s storage space for a specific purpose and leave the rest available for other uses.
A storage device is a term used loosely to mean anything that’s used for storing data. Storage devices comes in various forms, but they most commonly in the form of a partition (e.g. /dev/sdb2), or an unpartitioned block device (e.g. /dev/sdc), or a logical volume (e.g. /dev/mapper/centos-home). Before you can […]
To start storing data on a block device (e.g. a partition, logical volume, or antire storage device) you first need to install a filesystem on the block device. After that you then need to mount the filesystem. Mounting a filesystem is simply the act of associating a directory (aka a […]
jobs are processes that are triggered by you, when you run various commands in your current bash/putty terminal.
Journald is a service that systemd uses for capturing logs
In linux there are lots of processes running, there are a number of commands available to find and view these processes.
One thing you may want to do is to find and stop a process. There are a few ways to do this, but they all involve sending a process a “signal”. A signal is an instruction that can be sent to a process. Processes aren’t allowed to ignore an incoming […]
Changing a process’s priority is a good way to make your machine run more efficiently. Changing process priorities is to do with increasing/decreasing how much CPU time a process can have while the machine is running. For example if you are setting up a machine to primarily run as a web server, then it is a good idea to elevate the web-server related processes so that they get more access to the CPU.
If you have forgotten what your CentOS/RHEL system’s root password is, then you need to reset your machine’s root password. Resetting the root password requires rebooting your CentOS 7 machine, and then edit the GRUB parameters during boot time.
A unit is a resource that systemd can manage. If you look inside the /usr/lib/systemd/system directory, you will find files with different extensions, e.g. .socket, .target, .mount, …etc.