Articles tagged with rhel8

RHEL: Volumes

4 | Written on Thu 19 December 2019. Posted in Nuggets | Richard Walker

Logical volumes and logical volume management make it easier to manage disk space. Physical devices are the storage devices used to save data stored in a logical volume. Initialize a device as a physical volume before using it in an LVM system (PVs). Volume groups are storage pools made up …

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RHEL: Users and Groups

6 | Written on Thu 19 December 2019. Posted in Nuggets | Richard Walker

A user account provides security boundaries between different people and programs that can run commands.

Users have user names to identify them to human users. Internally, the system distinguishes user accounts by the unique identification number assigned to them, the user ID or UID. If humans use a user account …

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RHEL: Tuning Profiles

1 | Written on Thu 19 December 2019. Posted in Nuggets | Richard Walker

Optimizing system performance by adjusting various device settings based on use case workloads using tuned. Tuning can be either static or dynamic. Instal land enable tuned

dnf install tuned
systemctl enable tuned
systemctl start tuned

The tuned application provides profiles for power-saving and performance-boosting. Use the tuned-adm command to list …

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RHEL: Temp files

0 | Written on Thu 19 December 2019. Posted in Nuggets | Richard Walker

systemd-tmpfiles provides a structured and configurable method to manage temporary directories and files. When systemd starts a system, one of the first service units launched is systemd-tmpfiles-setup.

This service runs the command systemd-tmpfiles --create --remove . This command reads configuration files from /usr/lib/tmpfiles.d/*.conf, /run/tmpfiles.d/*.conf …

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RHEL: System Logging

1 | Written on Thu 19 December 2019. Posted in Nuggets | Richard Walker

Use logs for auditing the system and troubleshooting problems caused by processes or the kernel. Logs of events are in text files kept in the /var/log directory. The systemd-journald and rsyslog services handle the syslog messages in RHEL.

Many programs use the syslog protocol to log events to the …

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RHEL: Systemd

1 | Written on Thu 19 December 2019. Posted in Nuggets | Richard Walker

The systemd daemon manages start-up for Linux, including service start-up and service management in general. It activates system resources, server daemons, and other processes both at boot time and on a running system.

In RHEL, the first process that starts (PID 1) is systemd.

systemd uses units to manage different …

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RHEL: Swap

1 | Written on Thu 19 December 2019. Posted in Nuggets | Richard Walker

A swap space is an area of a disk under the control of the Linux kernel memory management subsystem. The kernel uses swap space to supplement the system RAM by holding inactive pages of memory. The combined system RAM plus swap space is called virtual memory.

RAM Swap Space Swap …

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RHEL: Subscription Manager

0 | Written on Thu 19 December 2019. Posted in Nuggets | Richard Walker

Use the subscription-manager command to register a system without using a graphical environment. The subscription-manager command can automatically attach a system to the best-matched compatible subscriptions for the system.

  • Register a system to a Red Hat account:
subscription-manager register --username=username --password=password
  • View available subscriptions:
subscription-manager list --available
  • Auto-attach …

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RHEL: Module Streams

1 | Written on Thu 19 December 2019. Posted in Nuggets | Richard Walker

RHEL 8.0 introduces the concept of Application Streams. Multiple versions of user-space components shipped with the distribution are available. They may be updated more frequently than the core operating system packages.

Modularity allows a single repository to host multiple versions of an application's package and its dependencies.

Content distributed …

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