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Hyper -V 2016

Active memory dump

Windows Server 2016 introduces a dump type of “Active memory dump”, which filters out most memory pages allocated to VMs making the memory.dmp file much smaller and easier to save/copy.

 

Azure Stack

A replacement for Windows Azure Pack (WAPack), bringing the code of the “Ibiza” “preview portal” of Azure to on-premises […]

Hyper-V Snapshots / Checkpoints

In Windows Server 2012 R2 Hyper-v Snapshots were renamed to so-called “Checkpoints“.

The following are 11 things to know about Hyper-V snapshots and checkpoints. Ideally an IT admin should be aware of all of them in order to make a well informed decision on when and how to use snapshots.

Advantages of Hyper-V Snapshots / […]

Deploy MySQL master-slave on CentOS7

Deploy MySQL master-slave on CentOS7

2 Locate the directory my.cnf file resides: MySQL –help | grep my.cnf general my.cnf are located in /etc/directory;

3 with vim open MySQL configuration file my.cnf: vim /etc/my.cnf

4 Locate the [mysqld] and subsequently add the following configuration: # uniquely identifies this MySQL server, the default value is 1, the […]

db

[root@clusterserver2 ~]# cat /etc/hosts 127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1         localhost localhost.localdomain localhost6 localhost6.localdomain6 192.168.1.20 clusterserver1.rmohan.com clusterserver1 192.168.1.21 clusterserver2.rmohan.com clusterserver2 [root@clusterserver2 ~]#

wget https://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm

[root@clusterserver2 software]# rpm -ivh mysql57-community-release-el7-8.noarch.rpm warning: mysql57-community-release-el7-8.noarch.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY Preparing…                          ################################# [100%] Updating / installing… 1:mysql57-community-release-el7-8  ################################# [100%]

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set password for root@localhost=password(‘Test@123’);

Master1 […]

docker on Centos 7

Install Docker

[root@clusterserver3 /]# yum -y install docker Loaded plugins: fastestmirror base                                                                                                                                                                      | 3.6 kB  00:00:00 extras                                                                                                                                                                    | 3.4 kB  00:00:00 updates                                                                                                                                                                   | 3.4 kB  00:00:00 Loading mirror speeds from cached hostfile * base: mirror.nus.edu.sg * extras: mirror.nus.edu.sg * updates: mirror.nus.edu.sg Resolving Dependencies –> Running transaction check —> Package docker.x86_64 0:1.8.2-10.el7.centos will be installed –> […]

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wget https://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm

[root@clusterserver2 software]# rpm -ivh mysql57-community-release-el7-8.noarch.rpm warning: mysql57-community-release-el7-8.noarch.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY Preparing…                          ################################# [100%] Updating / installing… 1:mysql57-community-release-el7-8  ################################# [100%]

After the installation of this package. We will get two new yum repo related to MySQL

[root@localhost ~]# ls -1 /etc/yum.repos.d/mysql-community* /etc/yum.repos.d/mysql-community.repo /etc/yum.repos.d/mysql-community-source.repo [root@localhost ~]# Installing MySQL Server

By […]

Securing Your Postfix Mail Server with Greylisting, SPF, DKIM and DMARC and TLS

”Domain-based Message Authentication, Reporting & Conformance” (DMARC).

DMARC basically builds on top of two existing frameworks, Sender Policy Framework (SPF), and DomainKeys Identified Mail (DKIM).

SPF is used to define who can send mail for a specific domain, while DKIM signs the message. Both of these are pretty useful on their own, and reduce incoming […]

Postfix Implement SPF Record Checking

So I’ve been dealing with quite a bit of spam recently, the usual “You’re due a tax rebate open XYZ.zip and fill out the form”, etc. Following from my last blog post, Postfix Force SMTP Authentication, I noticed I never setup my mail server to check received mail against the senders SPF records, which I […]

iSCSI Configuration on RHEL 7 / CentOS 7

iSCSI Configuration on RHEL 7 / CentOS 7 Step 1: First you need to create partition

[root@server1 ~]# fdisk -c /dev/sdb

Press ‘p’ to print partition table

Press ‘n’ to create a new partition

Press ‘p’ to create primary partition

Type Partition Number : 1

First Sector        : PRESS ENTER

Last Sector        : […]

Reset rhel7 root password

Reset rhel7 root password  In the RHCSA examination they ask to reset the root password, In this article we are going to learn how to reset rhel7 root user password. Whenever you type user password incorrectly it will shown an above error. Immediate After Right side of the corner there is a power button Click […]

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