Davoud Teimouri

Virtualization & Datacenter

Category: Linux

[Review]: What’s kernel Live Patching?

Linux Kernel Patching

Dynamic Software Updating (DSU) Dynamic Software Updating (DSU) is a field of research pertaining to upgrading programs while they are running. DSU is not currently widely used in industry. However, researchers have developed a wide variety of systems and techniques for implementing DSU. These systems are commonly tested on real-world programs. Current operating systems and programming languages are […]

2,880 total views, 3 views today

[New Release]: Popular Linux Distributions – July 2018

Linux Distribution

New Releases First CentOS 6.10, this distribution is one most popular distributions for any businesses. CentOS Linux is derived from source code released by Red Hat, Inc. New release has been announced at July 3rd, 2018. The major changes are as follows: The following packages have been rebased to a newer upstream release: pacemaker, clufter, gcc-libraries […]

3,039 total views, 3 views today

[Review]: Oracle Unbreakable Enterprise Kernel Release 5

The Unbreakable Enterprise Kernel Release 5 (UEK R5) is a heavily tested and optimized operating system kernel for Oracle Linux 7 Update 5 and later on the x86-64 and 64-bit ARM (aarch64) architectures. It is based on the mainline Linux kernel version 4.14.35. This release also updates drivers and includes bug and security fixes.

1,305 total views, 2 views today

[Review]: What is Container Linux?

Container Linux - Clustering

Container Linux Container Linux by Core OS (Core OS Linux) is a lightweight operating system which developed for servers and cluster under Apache License 2.0 . Initial release was October 3, 2013, 4 years ago and latest stable release is 1576.5.0 January 5, 2018. Container Linux has been developed to providing clustered infrastructure for running software on Linux containers. Container Linux has […]

9,591 total views, 9 views today

[How To]: Change Linux IP Address via PowerCLI

PowerCLI

How To Change Linux IP Address via PowerCLI There is some reason that you want to change IP address on virtual machines as an example, moving virtual machines to a new VLAN or port-group or moving them to another site or replicate virtual machine to an offsite recovery site. Changing IP on machines one by […]

7,828 total views, 10 views today

[Review]: Packet Drop vs Packet Loss – Linux

Packet Loss

Actually, Packet Loss occurs when one or more packet can’t reach their destination because of some issue such as link congestion, TCP can detect packet loss and send the packet again (During packet recovery process) but packet loss has impact on users, who are using streaming media application and actually all application that using unreliable protocols such as UDP.

Packet Drop is typically discarding packets on different layers after processing packets and packet drop is one of reasons of data loss in some conditions.

2,553 total views, 3 views today

[How To]: Linux Cat Command – Usage and Examples

Linux Cat Command - Create New File

Linux Cat Command Cat or “concatenate files and print on the standard output” is a Linux command to print file content on the standard output like screen. This is one of most popular Linux commands. I think that every Linux administrator has executed the below command at least one time 😉 :

So this […]

6,540 total views, 12 views today

[Linux]: /etc/sysconfig/network – No Such File or Directory

Linux Distribution

/etc/sysconfig/network – Missing! Sometimes, you did install Linux on a virtual machine that the virtual machine has no NIC, when installation has been completed, you will face with the below error during “ifdown”, “ifup” or restarting network services:

This is the usual error, because operating system doesn’t detect any NIC during installation and “Networking” […]

9,618 total views, 8 views today

kernel: WARNING: at fs/sysfs/dir.c:536 sysfs_add_one+0xbb/0xe0 – Oracle Enterprise Linux

Most of modern servers hardware are using UEFI instead of legacy BIOS and modern OS has dedicated partition to stores boot and EFI values. Some times, the partition gets full or OS generate the below log: kernel: WARNING: at fs/sysfs/dir.c:536 sysfs_add_one+0xbb/0xe0 Kernel includes a CONFIG_EFI_VARS_PSTORE feature, and a feature that dumps kernel message log (= […]

4,080 total views, 6 views today

New Release – Kali Linux 2017.1

Kali Linux

Kali Linux is one of most popular Linux distributions and many security experts are using this distribution as penetration testing system. Kali Linux is a Debian based distribution and most Kali’s packages are imported from Debian repositories. Kali has more than 300 preinstalled tools for penetration testing such as Armitage (a graphical cyber attack management tool), nmap (a […]

4,433 total views, 6 views today

CentOS 6.9 – New Release

After announcing new Red Hat Enterprise Linux and Oracle Linux, now CentOS developer team has released new version of the distribution. Actually and as may you know, CentOS created from RHEL source codes same as Oracle Linux and usually new CentOS version will be released after RHEL version. You can read release announcement on this […]

3,991 total views, 6 views today

Oracle Linux 6.9 – New Release

Oracle Linux 6.9 After releasing RHEL 6.9 by Red Hat, Oracle has released Oracle Linux 6.9 at March 28. The new release including some fixes and also new features. The below features are notable features: Transport Layer Security (TLS) 1.2 support for all system components. Other changes include vsftpd support for TLS 1.2 and auditd support […]

5,392 total views, 12 views today

New Release – Red Hat Enterprise Linux 6.9

New release of Red Hat Enterprise Linux has been released by Red Hat at 21st March 2017. Red Hat Enterprise Linux 6.9 comes with lot of new features and updates. New Features Here is new features and major enhancements introduced in Red Hat Enterprise Linux 6.9: General Updates Authentication and Interoperability Clustering Compiler and Tools Directory Server in […]

5,083 total views, 6 views today

Monitoring Temperature And Fan Speed In Linux By LM-Sensors

What’s LM-Sensors Health monitoring is very important for critical servers because administrators can do proper actions before any impact on service. There is many third-party software for monitoring Linux and Windows servers but native agents are also useful. We are going to review one of native solutions for hardware health monitoring in Linux. 5,383 total views, […]

5,383 total views, 10 views today

Remove Multipath Device – Map in use!

Multipath

Multipath Device, Remove From Linux Based on Red Hat solution (https://access.redhat.com/solutions/47438), the below steps should be done before flush any multipath device, otherwise the command will be failed: Locate any subsystem or process holding the multipath device open. For any subsystem or process holding the multipath device open, stop the process, or issue commands to […]

5,125 total views, 7 views today

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