Author: Rumi

Hasan T. Emdad is an ICT Solution Architect, Project Manager with 12+ year expertise in HW selection, OS expertise on Linux and MS, Supervising Application SW on Pearl, Java, dot Net and PHP with DB experience of MySQL, Postgre, MS and Oracle. He was involved in setting up several Turn Key ICT including Telecom based projects on various government and autonomous bodies in the country. Developed more than 50 applications running with different operators and users. Managing a team of more than 10 in-house engineers and developers and manages an outsourcing team experts and contributors. Very recently engineered Public Key Infrastructure (PKI) on Enterperise and Root Certifying Authority and deployed scalable Cloud Computing and Managed Services. He has post graduated (MBA) from University of Dhaka, Bangladesh.

Enable root logins using ssh in Debian 8.0

Rumi,

By default you can no longer login using ssh as root with just a password since it is more secure to use a pre-shared key. However, you can you can still enable root logins using password authentication. To do this you need to edit the ssh config file ‘/etc/ssh/sshd_config/sshd_config’ as…

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Add Linux machine on LibreNMS

Rumi,

Install SNMPD first SNMPd is not installed by default. You must first install snmpd. apt-get update apt-get install snmpd lsb -y Backup default snmp.conf file on the ‘/etc/snmp/’ directory and copy new one from the librenms directory. mv /etc/snmp/snmpd.conf /etc/snmp/snmpd.conf.asli cp /opt/librenms/snmpd.conf.example /etc/snmp/snmpd.conf or instead copy-paste below snmpd text

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Phpvirtualbox fix on 5.1 using 5.0

Rumi,

I was able to get v5.0-5 working with vbox 5.1 by commenting out the version check line and replacing it with a static value in the endpoints/api.php file: // $response[‘data’][‘responseData’][‘phpvboxver’] = @constant(‘PHPVBOX_VER’); $response[‘data’][‘responseData’][‘phpvboxver’] = “5.1-0”; Src: https://sourceforge.net/p/phpvirtualbox/discussion/general/thread/565b7f31/

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Perfect Backup MX using Postfix

Rumi,

This is quite simple, and with a very simple setup, and does not require that much, since we do not need to send out e-mails from clients from this server, or use ASMTP. I find that MySQL is not needed here, but could be used. I will use normal flat…

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PHP 7.0 on CentOS/RHEL 6.9 and 7.4 using Yum

Rumi,

Before beginning this, it is assumed that you already have installed LAMP on your server. To install, first you must add the Webtatic EL yum repository information corresponding to your CentOS/RHEL version to yum: CentOS/RHEL 7.x: rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm CentOS/RHEL 6.x: rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm rpm -Uvh https://mirror.webtatic.com/yum/el6/latest.rpm…

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Publishing long domain key SPF TXT records in bind9

Rumi,

If your bind is throwing error with long TXT data, you can do the following means to concatenate: You are using commas to separate your key/value pairs in your record instead of semi-colons. Change it to: a9d04665528b593d263a6e5256648c99._domainkey IN 1800 TXT ( “k=rsa;p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAz2/ZfhxSI/A” “bqgh0amM8ylrlosirWeKShUhq7fg12aYmRwOqq9hIzO0Fcz1BzfgHVu6HU++rC5” “QoUK0JQK/nk4jwkDgvG2di2ZYmAvEbY/VeiK1x/TG0p1Iczr2k6Bj0gEAb/YGD2” “YbwrwAi4bDXwoPsYuuNn9TB3jjyWKu/dvOsqhff1/4Wc+FkOi0ClvgrXiklN28X” “TLjyjSyU794ntIoegXxrfwcwkhfPMvuqcnhfIC0Z8L71M4WR4SoHyNHVfBtNlUv” “VNROiXlMxtxnNQvfViSwz6LC8bYIxeAba3hSXPTChKu3qZtfR0o3jFwEWAfLQdg” “Ixler0jMEoAyJmfQIDAQAB”)  

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How to Upgrade Node.js via NPM

Rumi,

Steps to Upgrade Node.Js Use the following steps to install or upgrade node.js to latest available version. Current NodeJs Version – First check current nodejs version on your system using following command. In my case it is v0.10.37.rahul@tecadmin:~$ node -v v0.10.37 Clean Cache Forcefully – Now clean all npm cache from your…

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