Recent Posts

April, 2015

  • 26 April

    Are you in VM or Physical host ? RHEL -7

    The whole world is moving towards virtualization. Unless you maintain the inventory on CMDB , it is very difficult to find the server location and configuration. The hyper-visors like VMware vSphere, Microsoft Hyper-V,  Xen and KVM supports Linux as virtual machine. If you have the proper CMDB for the virtual machine, you can easily find the hyper-visor for the VM …

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  • 25 April

    Disk Partitioning – MBR vs GPT on RHEL -7

    Disk partitioning allows a hard-drive to be divided in to multiple logical partitions on Redhat Enterprise Linux.  The multiple partitions can be used to create filesystems and it can be mounted in different mount points. Most of the operating systems are still using the MBR partitioning scheme and it has dictated how disks should be partitioned on systems running BIOS firmware. …

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  • 24 April

    RHEL – 7 Network Management – nmcli or nmtui

    nmlci is a wonderful command to configure the network profiles on Redhat Enterprise Linux 7.  nmcli also supports the command completion function by pressing “tab” key but still you need to use the quotes properly.  nmtui is an alternative command for nmcli which is based on “Text User Interface”.  It will be useful for RHEL-7 Beginners but experienced system administrators …

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  • 22 April

    RHEL – 7 Managing the network with Network Manager

    In the last article, we have seen that how to review the current network configuration in RHEL 7. Redhat has introduced the profile based network management on Redhat Enterprise Linux 7. Network manager is a daemon that monitors and manages the network settings. Network manager can be managed using nmcli and other graphical tools. These tools will automatically update /etc/sysconfig/network-scripts  in the …

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  • 21 April

    RHEL 7 – Networking overview

    Redhat has made a lot of changes in the RHEL-7’s networking part. In Red Hat Enterprise Linux 7, the default networking service is provided by NetworkManager, which is a dynamic network control and configuration daemon that attempts to keep network devices and connections up and active when they are available. The traditional ifcfg type configuration files are still supported.  To view the current network …

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  • 18 April

    Redhat Enterprise Linux 7 – systemd targets

    Redhat Enterprise Linux 7 ‘s booting process also modified lot when you compare to the earlier versions. Instead of grub ,we have grub2 in RHEL 7  to boot the system. The boot loader loads the configured kernel and initramfs from disk to memory. An initramfs  is a gzip-ed cpio archive containing kernel modules for all hardware which required at boot, init …

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  • 16 April

    Service Management (systemd) – RHEL 7

    Prior to Redhat Enterprise Linux 7 operating system, init was the process which is responsible for activating the other services in the system. There were daemons and many system V LSB scripts were started at the boot time. These are mostly likely the shell scripts which resides under the /etc/init.d directory and called on the different run levels. But this system has lot of …

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  • 15 April

    RHEL 7 – Graphical User Mode(GUI) is not coming ?

    When you install the Redhat Enterprise Linux on datacenter, we will be not be installing with gnome packages by default. But in some cases, you may need graphical user mode. So you have to install the gnome packages and it’s dependencies to bring the system in to GUI. In my case , I have installed the RHEL 7 without installing the GNOME packages. Let’s …

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