VMware Tools are very important role plays when
working with VMware Player, VMware Workstation Pro, VMware ESXi or vSphere. If
VMware Tools are installed on a guest, it will report back to the VMware
hypervisor guest’s IP address, CPU usage, disk usage, memory usage etc.
Installing VMware Tools on a Linux machine requires a few extra steps compared
to Windows. RPM based installation performed on CentOS 8 and
related packages are available in its default’s repository.
Saturday 17 December 2022
Wednesday 14 December 2022
How to Install/Reinstall ssl on CentOS 7
Openssl is a base package of ssl binaries and
available in default repository CentOS 7 minimal installation. If removed by accident or
broken, the package can be installed or reinstalled again using yum. openssl is
an essential tool of any Linux distributions to work with various certificates.
Tuesday 29 November 2022
How to Install Open VMware Tools on CentOS 7
VMware Tools are very important role plays when
working with VMware Player, VMware Workstation Pro, VMware ESXi or vSphere. If
VMware Tools are installed on a guest, it will report back the guest information to the VMware
hypervisor like guest’s IP address, CPU usage, disk usage, memory usage etc.
Installing VMware Tools on a Linux machine quit easy. In this article, RPM based installation performed on CentOS 7 and
related packages are available in its defaults repository.
Tuesday 15 November 2022
Monday 14 November 2022
Friday 11 November 2022
How to Maintain Specific Number of Kernel Packages on CentOS 8
Sometime due to less space on /boot
partition need remove old kernel packages once new/updated kernel installed.
The “installonly_limit” option in /etc/dnf/dnf.conf is used to maintain the number
of kernel available. By default, the limit is set to 3 kernels in CentOS 8.
Wednesday 9 November 2022
How to Change Machine ID after Cloning a VM on CentOS 7
A
Machine ID is a unique hexadecimal, 32-character, lowercase code of the local
system that is set during installation and represents an individual machine ID
over the network.
Thursday 3 November 2022
How to Install KSH (Korn Shell) Shell on CentOS 8
KSH (Korn Shell) is a shell programming language,
which is upward compatible with 'sh' (Bourne Shell). KSH was developed by
David Korn at Bell Labs in 1980s. KSH is quite popular and used by most of the Linux System Admins to
automate daily tasks on Linux/Unix like operating systems. You can install ksh on CentOS
8 using its AppSteam repository.
How to Configure Local YUM repository on CentOS 8 using Installation ISO Image
YUM (YellowDog Updater
Modified) is a package management tool for RPM based Linux system that helps to
install, uninstall, and update packages local and other client machines over
the network. YUM resolve all dependency and install the package with all
dependencies. CentOS 8 has two repositories BaseOS and AppStream and they are
different from each other. BaseOS repository provides packages which are useful
for an operating system and AppStream provides software packages such as
databases and dependencies.
Wednesday 2 November 2022
How to Install SNMP Tool on CentOS 7
Monitor
Routers, Firewalls and Linux Servers agentless, with the support of SNMP (Simple Network Management Protocol) tool. It
is an internet protocol that can retrieve the operational statistics from the
devices remotely. Its binary available in CentOS 7.
Friday 21 October 2022
Thursday 13 October 2022
How to Maintain Specific Number of Kernel Packages on CentOS 7
Sometime due to less
space on /boot partition need remove old kernel packages once new/updated
kernel installed. The “installonly_limit” option in /etc/yum.conf is used to
maintain the number of kernel available. By default the limit is set to 3
kernels in CentOS
7.
Friday 7 October 2022
How to Install GlusterFS on CentOS 7
GlusterFS packages are
not included in the default CentOS
7 repository so the packages can be installed from Gluster repository and
EPEL repository. GlusterFS packages needs to install on all the GlusterFS
Nodes.
Saturday 16 July 2022
How to Resolve YUM Repo Mirror URLs List Issue on CentOS 8
Sometime mirror URLs does
not work on CentOS
8 systems and gives the below error. To solve the yum repo
issue need to replace it with base URLs.
Friday 8 July 2022
How to Install Grafana Beta Monitoring tool on CentOS 7
Grafana is a power full
software for real time system data monitoring also generate graph and dashboard
for easy understanding. It is available in community and enterprise editions. Beta
release can also installed via its separate repository.
Wednesday 6 July 2022
How to Install Grafana 9 Monitoring tool on CentOS 7
Grafana is a power full
software for real time system data monitoring also generate graph and dashboard
for easy understanding. It is available in community and enterprise editions.
Thursday 30 June 2022
How to Install Spacewalk Server on CentOS 7
Spacewalk tool is a free
and open source Linux operating system management tool for system provisioning
and configuration/management/updating tool of its clients. It is a community
version of Red Hat Satellite Server and widely used on Red Had derived
distributions.
Tuesday 29 March 2022
How to Enable Networking in Rescue Mode in CentOS 7
Sometimes required
network connectivity in rescue mode to take server logs to other
server/workstation for further analysis as the networking is not enabled during
the initial rescue environment setup.
Sunday 6 March 2022
How to disable consistent network device naming in CentOS 8
This article describes
How to disable consistent network device naming in CentOS
8.
How to Configure Local Synced YUM repository on CentOS 7 using vsFTP
YUM
(YellowDog Updater Modified) is a package management tool for RPM based Linux system
that helps to install, uninstall, and update packages. Local yum repository is
used to save bandwidth, fasten package installations, network installations and
systems updates for n numbers of systems in a local area network.
Friday 4 March 2022
How to Install and Configure Anonymous vsFTP Server on CentOS 7
vsFTP
(Very Secure File Transfer Protocol) is a free and open source widely used
client-server network protocol that used for transferring files between server
and clients over the network.
How to Install FTP Client on CentOS 7
FTP (File
Transfer Protocol) is a free and open source widely used client network
protocol. It basically used to connect vsFTP server to upload/download files from
server to client machine.
Tuesday 1 March 2022
How to Extend a Logical Volume on CentOS 7
Sometime encountered
with no space left on file system error and demand opened to increase file
system space. It would be easy if file system is created under LVM.
How to Change or Rename a Regular Mount Point in CentOS 7
Sometimes mount point
renaming require on a machine for any user request or any application
requirements.
How to Configure Local Synced YUM repository on CentOS 7 using NGINX
YUM
(YellowDog Updater Modified) is a package management tool for RPM based Linux system
that helps to install, uninstall, and update packages. Local yum repository is
used to save bandwidth, fasten package installations, network installations and
systems updates for n numbers of systems in a local area network.
Friday 25 February 2022
How to Allow/Deny Access for AD Users/Groups using Realmd on CentOS 8
Once the Linux machine
joined with any Active Directory Domain, all the AD users can get SSH login on
the machine with regular user privileges to avoid this access can manage using
realm command.
Thursday 24 February 2022
How to Resolve Slow SSH Login Before Getting Password Prompt on CentOS 8
Sometime SSH login
failures encountered with gssapi-with-mic authentication method and hence takes
time to get password prompt.
Wednesday 23 February 2022
How to Allow SUDO Access to a Domain User/Group on CentOS 8
By default, Domain users
doesn’t have any type of sudo privilege and even can’t switch as root user. On
CentOS 8 sudo access can be granted access based on usernames or groups and
same can be done for one/many commands.
Tuesday 8 February 2022
How to Extend Logical Volume on CentOS 8
Sometime encountered
with no space left on file system error and demand opened to increase file
system space. It would be easy if file system is created under LVM.
Sunday 30 January 2022
How to Install tcpdump and use of tcpdump command on CentOS 8
Tcpdump is a command line utility which is
widely used to capture packet sniffer or filter TCP/IP packets that received or
transferred over the network. it is allowing to
analyse headers of TCP/IP which helps in network troubleshooting.
How to Configure Local Synced YUM repository on CentOS 7 using HTTP
YUM
(YellowDog Updater Modified) is a package management tool for RPM based Linux system
that helps to install, uninstall, and update packages. Local yum repository is
used to save bandwidth, fasten package installations, network installations and
systems updates for n numbers of systems in a local area network.
Sunday 16 January 2022
How to Resolve showmount fails with error “clnt_create: RPC: Program not registered “on CentOS 7
NFS
share is a network file sharing protocol. It is used to provide shared access
to files and folders across Linux machines over the network. This error comes
when sometime the NFS service is stopped on the NFS server and will gives the below
error while running showmount –e <NFS Server IP>.
Saturday 15 January 2022
How to Resolve kernel panic at boot with error initrd image file not found on CentOS 7
Sometime after yum update transaction break or kernel update or fresh install, the system fails to find
initrd (initial ram disk) and also due to that unable to mount the root file
system and also fail to boot the system with below message on CentOS
7 systems:
How to Resolve “kernel panic at boot with error Unable to mount root fs on unknown-block” on CentOS 7
Sometime after yum update transaction break or kernel
update or fresh install, the system fails to mount the root file system and
also fail to boot the system with below message on CentOS 7 systems:
Wednesday 12 January 2022
How to Configure Local YUM repository on CentOS 7 using ISO Image
YUM
(YellowDog Updater Modified) is a package management tool for RPM based Linux system
that helps to install, uninstall, and update packages local and other client
machines over the network. YUM resolve all dependency and install the package
with all dependencies.
Tuesday 11 January 2022
How to Install SEmanage on CentOS 8
SEmanage is a command-line
utility and provide ability to manage SELinux contexts. Its needs separate
installation by default this package is not available in CentOS 8
minimal installations.
How to resolve -bash: showmount: command not found on CentOS 8
showmount command: It is
a command-line utility and provide ability to manage NFS share. Its needs separate
installation by default this package is not available in CentOS 8
minimal.
How to Resolve wrong fs type while mounting NFS share on CentOS 7
NFS
share is a network file sharing protocol. It is used to provide shared access
to files and folders across Linux machines over the network. This error comes
when the nfs-utils package is missing from the machine and will give the below
error while mounting any NFS share point.
Tuesday 4 January 2022
How to resolve -bash netstat command not found on CentOS 8
Netstat is a command-line
utility and provide ability to check open ports whether it is UDP or TCP. Its
needs to separate installation by default this package is not available in CentOS 8
minimal.
How to resolve -bash: semanage: command not found on CentOS 8
Semanage command: It is
a command-line utility and provide ability to manage SELinux contexts. Its
needs to separate installation by default this package is not available in CentOS 8
minimal.
How to Install and Use tcpdump Command on CentOS 8
Tcpdump is a command
line packet sniffer/ packet analyser tool which used to capture or filter
TCP/IP packets that received or transferred over a network on a specific
interface. By default, tcpdump is available under most of Linux distributions
but if we have a minimal installation of CentOS
8.
Saturday 1 January 2022
How to Disable SSH Remote Root Login on CentOS 8
After fresh system
installation the Remote root login is enabled by default on the CentOS
8. As recommended, SSH Remote root login must be disabled for security and compliance
on production systems.
How to Enable SSH root login on CentOS Stream 9 System
After fresh system installation the root login on the CentOS
Stream 9 is disabled by default. When attempt to login as root user to CentOS
Stream 9 the access will be denied (access denied).
How to Install CentOS Stream 9 Minimal Step by Step
The CentOS Project is recently
released CentOS Stream 9. It is a new community version of RHEL and added many
new features for users.
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