Sometimes, when you are working on a Linux environment, you may need to install some new packages on a daily basis. For this purpose, you need to check memory usage to install a new program. So, you should know how to check available and installed RAM or memory on your system. In this article, we will explore some major commands that are useful to check the memory usage in CentOS 8.
You can check the memory usage on your CentOS 8 Linux system by using the following five different commands which we will explain one by one in detail:.
It displays the real-time information about the memory usage as well as the shared memory which is used by the kernel, buffers details. When you will execute the free command on the terminal, it will display the following information:.
Data represented in the above image, such as under the used, available, and swap memory terms are in kilobytes. Buffers amount of memory which is reserved by the OS kernel. This memory is further allocated as buffers when process will need. Available shows memory which is available for starting new tasks, without swapping. Using the following command you can explore a complete description and all options of free command:.
Any RAID functions provided by the mainboard of your computer, or attached controller cards, need to be configured before you begin the installation process. You can connect and configure external USB storage after installation. Most devices are recognized by the kernel, but some devices may not be recognized.
If it is not a requirement to configure these disks during installation, disconnect them to avoid potential problems. The device must be supported by firmware available on the system, or by a UEFI driver. These sets are automatically detected during the boot process and their device node paths can change across several booting processes. You can find the file system labels and device UUIDs using the blkid command. Supported installation targets An installation target is a storage device that stores CentOS and boots the system.
Fibre Channel Host Bus Adapters and multipath devices. Some can require vendor-provided drivers. Xen block devices on Intel processors in Xen virtual machines. Installing CentOS as an additional operating system on an existing system. Contact your network administrator if you need assistance with networking requirements. Disk and memory requirements If several operating systems are installed, it is important that you verify that the allocated disk space is separate from the disk space required by CentOS.
We also provide detailed explanations of what they do and more importantly, how to interpret the results. The commands will work with nearly all Linux distributions. In this instance, the commands and the results are presented using Ubuntu This is a virtual file that reports the amount of available and used memory.
The output might differ slightly based on the architecture and operating system in question. Typing free in your command terminal provides the following result:. However, it is easier to understand. The key figure being the available value as it displays how much memory is still available for running new applications. The free command has multiple options to format the output so that it better matches your requirements.
The table below lists the most useful variations of the free command. Note: As with most commands, entering man free displays an overview of all variations and descriptions of the results. The vmstat command is a useful tool that reports virtual memory statistics.
The detailed description listed below provides an explanation for each value in case you need assistance in analyzing the results. The top command is useful to check memory and CPU usage per process. It displays information about:.
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