R&D - Commands to check resource on Centos

[nadizeq]

The resources can be classified as:

1. Disk space
2. Memory
3. CPU Utilization
4. Running processes

- For Resources #1

Using df command where df stands for disk filesystem. Example:

1. df -h --> Display information in human readable format. Disk space value is displayed in GB and MB

2. df -m --> display in MB

Using du command where du stands for disk usage. Example:

1. du -h --> Show the size of the folder
2. du -h --time --> Display the last modification time

fdisk command is used to monitor the partition of the disk and can do delete, create, move and copy disk partition as well. But required root privilege.

• sudo fdisk -l --> Retrieve information on all available partition on operating system
• sudo fdisk -l

- For Resources #2

Using free command to get the overview information on the detail used for computer memory and swap.

Example:

Column in the output represent information that is shown in the table below.

• free -h
• free -m

Pro: Can be easily understood and it provide summation Con: It is not detailed and it only shows the overview

To get more detailed information, is to view meminfo which can be done by typing the command:

• cat /proc/meminfo

Other commands: top, htop

- For Resources #3

top

• list of all the processes that are currently running
• readout of users, tasks, CPU load, and memory usage
• M – sort task list by memory usage
• P – sort task list by processor usage
• N – sort task list by process ID
• T – sort task list by run time

Example output after running top command:

- For Resources #4

4. Running Processes
   • ps

To check all process:

• top

[nadizeq]

Reference:

Resource #1

• https://linuxhint.com/check_disk_space_centos/

Resource #2

• https://phoenixnap.com/kb/linux-commands-check-memory-usage

Resource #3

• https://phoenixnap.com/kb/check-cpu-usage-load-linux

Resource #4

• https://www.cyberciti.biz/faq/show-all-running-processes-in-linux/