syslogs which gets messages sent in systemd-journald and stored the data in the disk. To view the systemd messages execute journalctl and can be used with additional parameters. In this post we are going to see quick howto use journalctl command and how to use it
In this post we are going to see how to write a script to find the subnet calculator, we are using korn shell to write. the interpreter we are going to use /bin/ksh, the korn shell supports MacOS, Linux and Unix flavours. This will be helpful for assign the ip address to the server ip planning.
UNIX shell programs executes the user command. User can enter like a command directly or executes a set of commands from a file called as a script file or program. Shell scrips are not compiled, it is interpreted executes line by line.
In this post we are going to see Linux user and group administration, this is applicable for RHCSA Exam for RHEL 8 / 7 versions. We are going to see Linux users and group creation, modification, deletion. Managing user and group can be done by command or GUI tools
What is CentOS
CentOS is a reproduction of Redhat enterprise Linux(RHEL), CentOS is a stable release unlike Fedora it is a beta version of RHEL, CentOS provides regular updates and security patches like Redhat. CentOS is open source platform, so anyone can download and use it it and distribute for free.
Ansible ad-hoc commands are mainly useful for one time task. for example if we want to check the whether servers are reachable, or to find kernel or os version for servers, in this section we are going to see few use cases with ansible adhoc commands
dnf or Dandified YUM utility used in since Fedora 18, RHEL / CentOS8, In this blog we are going to see dnf features and how to use. dnf package manager utility is used to install / remove / update package and dependencies, the dnf repolist command will display the available repos in the dnf repository
LVM is a device mapper that manages the block devices. LVM disk can be resized, expect boot volume (/boot) all other file system can be made into LVM partitions.
We can dynamically allocate / de-allocate the file system with out rebooting the server. For expansion of disk is an online change, while removing a disk requires a minimal downtime.
YUM – Is Yellow Dog Update / Modifier, is a command line tool used as package manager. using yum we to install / update /remove the package.
Dependencies are installed automatically from the yum repository. In this section we are going to see general commands that are used for daily activities. YUM is free and open source.
Linux is Open source software in earlier stages, It has been the most used operating system in the world, the Linux distributions are based on collection of software, based on the package manager the Linux distributions are available, both Open source and commercial Operating systems are available.