The xendomains service automatically starts, stops, and migrates Oracle VM clients (domU) as the Oracle VM server (dom0) boots or shuts down. In essence, the xendomains service automatically issues a series of xm commands to ensure the proper Oracle VM clients are started and stopped as the dom0 server is started or stopped. No daemons […]
Archives for March 2018
Features of the “Btrfs” Filesystem
Btrfs is an open-source, general-purpose file system for Linux. The name derives from the use of B-trees to store internal file system structures. Different names are used for the file system, including “Butter F S” and “B-tree F S.” Development of Btrfs began at Oracle in 2007, and now a number of companies (including Red […]
How to Tune Btrfs Filesystem for Better Performance
Btrfs is a filesystem which is very new and is still under development and benchmarking phase. As far as performance is concerned usually it doesn’t require much to do with because it works good with the default options. 1. Btrfs’s performance improves with use of ssd. Btrfs is SSD-aware and exploits TRIM/Discard to allow the […]
How to Convert Ext File Systems to Btrfs
btrfs or Butter FS is a filesystem and has some interesting features: One can have FS snapshots. It is like a freeze of the filesystem at some point of time. btrfs is a extent-based filesystem. This means there are no lists of pointers. btrfs tracks contiguous blocks. btrfs makes checksums of data and metadata. Therefore […]
“btrfs” command examples to Create and Manage Btrfs File System
Btrfs is an open-source, general-purpose file system for Linux. The name derives from the use of B-trees to store internal file system structures. Different names are used for the file system, including “Butter F S” and “B-tree F S.” Development of Btrfs began at Oracle in 2007, and now a number of companies (including Red […]
How to Create and Mount Btrfs Snapshots
Btrfs is an open-source, general-purpose file system for Linux. The name derives from the use of B-trees to store internal file system structures. Different names are used for the file system, including “Butter F S” and “B-tree F S.” Development of Btrfs began at Oracle in 2007, and now a number of companies (including Red […]
Beginners Guide to Swap Space Management in Linux
What is swap space Swap space is used in Linux when there is insufficient physical memory (RAM) on your system to store the data currently being processed. When your system needs more memory, inactive memory pages are written to the disk, freeing up physical memory. Increasing swap space should not be considered as a solution […]
Maintaining Linux filesystems using “fsck” and “tune2fs”
The best tool for maintaining file systems is fsck, which checks and repairs Linux file systems. By default, fsck runs after 20 system reboots but should be run manually if your system runs for weeks or months with rebooting. The frequency of file system checks is changed by using the tune2fs command. Other utilities for […]
Linux OS Service ‘ldap’
Linux provides both server-side and client-side support for the Lightweight Directory Access Protocol (LDAP) facility. This is a standards-based facility, so it is compatible with other LDAP implementations, including Microsoft’s Active Directory. Data suitable for a directory service has low volatility as LDAP is optimized for read-mostly access; database systems are tailored for more volatile […]
CentOS / RHEL 7 : How to enable or disable automatic updates (via packagekit)
PackageKit is the graphical software updater in RedHat based linux distributions. The posts outlines the steps required to enable or disable the automatic updates via the PackageKit updater. Disabling PackageKit 1. Check the status of PackageKit service. # systemctl status packagekit ● packagekit.service – PackageKit Daemon Loaded: loaded (/usr/lib/systemd/system/packagekit.service; static; vendor preset: disabled) Active: active […]