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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.

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

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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:~$

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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…

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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…

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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>

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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

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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…

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Convert squid timestamps

Rumi, July 27, 2017

When you work with a squid access log file you sometimes want to know when a site or resource was accessed. Squid does not store the date and time information for that in a human readable format. It is stored as <unix timestamp>.<centisecond> so you can use a command like…

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Zimbra 8 on Ubuntu 14 with DKIM activation

Rumi, June 14, 2017

Step 1 – connect to your server, get root privileges and install this package. apt-get install libgmp10 libperl5.18 unzip pax sysstat sqlite3 dnsmasq wget Configure hostname and DNS Server In this tutorial will use the ‘dnsmasq’ resolving nameserver to speedup DNS lookups in Zimbra. Dnsmask has been installed as prerequisite…

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Outlook settings for vestacp

Rumi, June 11, 2017

Properly set up a Mail Client in Vesta Control Panel You can use Thunderbird, Apple Mail, Outlook or Outlook Express Use full e-mail address as username IMAP and SMTP STARTTLS with normal passwords Example Settings: Username: william.cage@alpha-mimic.ltd password: aXly8Kbiqo IMAP hostname: alpha-mimic.ltd IMAP port: 143 IMAP security: STARTTLS IMAP auth…

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Myself…

Hi, I am Hasan T. Emdad Rumi, an IT Project Manager & Consultant, Virtualization & Cloud Savvyfrom Dhaka, Bangladesh. I have prior experience in managing numerous local and international projects in the area of Telco VAS & NMC, National Data Center & PKI Naitonal Root and CA Infrastructure. Also engaged with several Offshore Software Development Team.

Worked with Orascom Telecom-Banglalink, Network Elites as VAS partner, BTRC, BTT (Turkey) , Mango Teleservices Limited and Access to Informaiton (A2I-UNDP)

Currently working at Oracle Corporation as Principal Technology Solution and Cloud Architect.

You can reach me [h.t.emdad at gmail.com] and I will be delighted to exchange my views.

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