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.

Install and configure ClamAV Antivirus on CentOS 6

Rumi, September 5, 2017

Enable EPEL repository CentOS 6.x 32-bit: # rpm –ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm CentOS 6.x 64-bit: # rpm –ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm Check the repository list.

Publishing long domain key SPF TXT records in bind9

Rumi, September 5, 2017

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”)

How to Upgrade Node.js via NPM

Rumi, August 23, 2017

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…

Installing Certbot on Debian 8

Rumi, August 23, 2017

root@server:~# cat /etc/apt/sources.list deb http://ftp.de.debian.org/debian/ jessie main deb-src http://ftp.de.debian.org/debian/ jessie main deb http://security.debian.org/ jessie/updates main deb-src http://security.debian.org/ jessie/updates main deb http://ftp.de.debian.org/debian/ jessie-updates main deb-src http://ftp.de.debian.org/debian/ jessie-updates main deb http://ftp.debian.org/debian jessie-backports main

Failed to open /var/mail/root : No such file or directory

Rumi, August 21, 2017

If you’re receiving the following message on webmin- “Failed to open /var/mail/root : No such file or directory”. Possible resolution is- rumi@mordor:~$ rumi@mordor:~$ sudo touch /var/mail/rumi rumi@mordor:~$ sudo chown thufir:mail /var/mail/rumi rumi@mordor:~$ sudo chmod o-r /var/mail/rumi rumi@mordor:~$ sudo chmod g+rw /var/mail/rumi rumi@mordor:~$ rumi@mordor:~$ mail No mail for thufir thufir@mordor:~$

Best Practices on Email Protection: SPF, DKIM and DMARC

Rumi, August 20, 2017

Once we installed Zimbra Collaboration, we need to be aware of some additional configurations that will allow us to send emails to other Email systems with an improve Security, such Gmail, Hotmail, Yahoo!, etc. This Wiki article will show the different Email Protection resources that exists, depends of the volume…

How to start Google Chrome in Incognito Mode default

Rumi, August 15, 2017

Place a Google Chrome shortcut on the desktop (or any other desired location). Rename the shortcut to any convenient name like – Private Chrome. Right click on the shortcut and select “˜Properties’. On the “˜Target’ field add an –incognito to the end of program path. (Note: Make sure there is…

Proxmox VM is locked (backup)

Rumi, August 7, 2017

Problem found- Error show: Code: INFO: setting parameters failed – VM is locked (backup) ERROR: Backup of VM 516 failed – command ‘qm set 516 –lock backup’ failed with exit code 255 Resolution: qm unlock <vmid>

Moving MySQL/Windows to same version of MySQL/Linux

Rumi, August 5, 2017

Moving MySQL/Windows to same version of MySQL/Linux. You can mysqldump all the databases as follows: C:\> mysqldump -uroot -p –routines –triggers –flush-privileges –all-databases > MySQLData.sql Move MySQLData.sql to Linux box and run the reload mysql -uroot -p < MySQLData.sql

Apache Virtual Hosts on Debian 7

Rumi, August 2, 2017

Virtual Hosts are used to run more than one domain off of a single IP address. This is especially useful to people who need to run several sites off of one virtual private server– each will display different information to the visitors, depending on which website the user is accessing.There…