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Linux System Administration 30

Tutorials, tricks and tips for linux system administration, management, troubleshooting security and devops.
 

Linux Access Control Lists

ACLs (Access control lists) are a security feature which can expand or restrict permissions on files and directories in a linux file system. Redhat/CentOS 7 use xfs by default and are automatically configured with ACLs however if you are using 6 or below or a different filesystem format you will need to mount the file […]

6 years ago More
 

Bridged Networking Setup For KVM Virtualization

A bridged networking setup is typically used in KVM(Kernel-based virtual machine) to allow the virtual machines to access the LAN/WAN over the IP address on the physical host. This guide is focused on a CentOS or similar derivative configuration setup. This is the second part of a multi-part series in setting up KVM services on […]

6 years ago 4 More
 

KVM installation on CentOS

KVM(Kernel-based Virtual Machine) is a full virtualization software for linux. You can run multiple virtual server instances under one physical host. This allows you to seperate services and run them on different virtual machines.  The link to the project can be found here. Running virtual servers is often used to condense many physical machines into […]

6 years ago More
 

using inotify-tools to trigger events

What are Inotify-tools? Inotify-tools is a C libary that interface with the inotify kernel function. Inotify-tools are available on kernels later than 2.6.13.  These tools can monitor or act based on file system events, this is particularly useful for scripting out actions you would like to happen if an event takes place. Install on Fedora […]

6 years ago More
 

Journalctl Introduction and Examples

journalctl was added into the  systemd release of CentOS 7 and has been part of Fedora since 17. It is a logging system for querying and printing messages form the journal. It can be used in with or replacing older logging services like rsyslogd. Journalct also uses highlighting for high priority messages in red and […]

6 years ago More
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