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Category: Configurations (Linux)

How to Change Hostname on Ubuntu 18.04

Rumi, August 6, 2019

Display the Current Hostname To view the current hostname, enter the following command: hostnamectl As you can see in the image above, the current hostname is set to ubuntu1804.localdomain. Change the Hostname The following steps outline how to change the hostname in Ubuntu 18.04. 1. Change the hostname using hostnamectl…

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Split large file and combine file in Linux

Rumi, August 6, 2019August 6, 2019

$ du -h Linux\ Security.mp4 Sample output: 1.1G Linux Security.mp4 As you see, the video file size is 1.1 GiB, which is very large to upload to my google drive. Even though, Google Drive lets users upload files up to 5TB in size, it is really time consuming process. With my low speed Internet…

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Install Netdata on CentOS 6

Rumi, August 6, 2019

Installing Netdata [root@linuxhelp Desktop]# yum install zlib-devel libuuid-devel libmnl-devel gcc make git autoconf autogen automake pkgconfig -y Loaded plugins: fastestmirror, refresh-packagekit, security Setting up Install Process Determining fastest mirrors . . perl-Error.noarch 1:0.17015-4.el6 perl-Git.noarch 0:1.7.1-9.el6_9 ppl.x86_64 0:0.10.2-11.el6 Complete! It doesn’t end with that, you should also install additional packages. Run…

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Allow firewalld for webmin access after post installation

Rumi, August 4, 2019

FirewallD is an IPv6 compatible firewall mechanism used in recent Linux distributions (RedHat/Fedora/CentOS) replacing good old iptables.

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Repeat a Linux Command Every X Seconds Forever- using watch

Rumi, July 29, 2019

Use watch Command Watch is a Linux command that allows you to execute a command or program periodically and also shows you output on the screen. This means that you will be able to see the program output in time. By default watch re-runs the command/program every 2 seconds. The…

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Set Up Apache Virtual Hosts on Debian 7

Rumi, July 29, 2019

Step One— Create a New Directory First, it is necessary to create a directory where we will keep the new website’s information. This location will be your Document Root in the Apache virtual configuration file. By adding a -p to the line of code, the command automatically generates all the…

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How to copy files using no owncloud web interface

Rumi, July 22, 2019July 22, 2019

Migrating was instant since we’re moving on the local fs. Checking the above screenshot you can see the rights are still the same of course. Own the folders to the ownCloud user and change the permissions to octal 755: # Recursively own the folder to www-data sudo chown -R www-data:www-data…

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Increasing Attachment Size in Posfix

Rumi, July 19, 2019

Postfix by default restrict attachment size to approx 10MB i.e. 10240000 bytes. You can check it using following command: postconf | grep message_size_limit To change attachment-size to say 50 MB, run a command like: postconf -e message_size_limit=52428800 Note: If you are running a mail-server with SMTP/IMAP access, you need to change…

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Install Poppassd in CentOS 7

Rumi, July 19, 2019November 15, 2019

Steps for configuration change password plugin for squirrelmail/Horde/Rainloop using poppassd are: Download poppassd.c from https://netwinsite.com/poppassd/ Look at poppassd.c and make sure it looks safe yum -y install gcc gcc poppassd.c -o poppassd -lcrypt mv poppassd /usr/local/bin/ yum -y install xinetd cp /etc/xinetd.d/time-stream /etc/xinetd.d/poppassd nano /etc/xinetd.d/poppassd Update “service time” to “service…

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DNS Slave Using Virtualmin

Rumi, July 19, 2019

DNS Slave Auto-Configuration Quickstart A quick guide to assist administrators who want to use Virtualmin’s automatic DNS slave configuration features. This allows for DNS server redundancy. Introduction Virtualmin can automatically manage any number of DNS slave servers for you. Once configured, it will create slave zones on other servers and…

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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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