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Vesta- How to set up master-slave DNS cluster

Rumi, January 28, 2019January 28, 2019

If you are looking for the options to avoid any DNS-related downtime or the way to manage dns across all server you have, you might consider to set up dns cluster. Create user dns-cluster on a server which will be used as dns slave On the second server (slave) with…

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Install Vesta Control Panel (vestacp) on Centos 7 with PHP-FPM and PHP 7.2

Rumi, January 28, 2019

I had few issues on my container and KVM on installing vestacp. Issues were like quite weird, such as- Post installation on KVM- it moved into emergency maintenance mode Post installation on LXC container- DNS resolution halted After hours and hours of search, found few root causes- I have to…

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SPF, DKIM, DMARC – Sample and perfect record values

Rumi, January 27, 2019

Sharing some sample record value of the post subject for future reference: SPF: domain.gov.bd. IN TXT “v=spf1 a mx ip4:1.2.3.4 ?all” DKIM: MDaemon._domainkey.domain.gov.bd. IN TXT “v=DKIM1; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDIaJcNDjvJ6LJ/zyZCIOuaQiLMSC+FBfky8JMFE7LUGlP4LXwmpaKO3Z67x+PVXgYbbFU9nzLaFOfIXTbsCh6LYLBgQF+PNghbTAchQ59IEMrMRsTPCCg95+gKYRupN0B96Uz7rrXifZL8T+yl9MkpIlAsXXs7e8Vhzwa94NdVjQIDAQAB” DMARC: _dmarc.domain.gov.bd. 3600 IN TXT “v=DMARC1; p=quarantine; sp=quarantine; rua=mailto:postmaster@domain.gov.bd; ruf=mailto:postmaster@domain.gov.bd; rf=afrf; pct=100; ri=86400” DMARC Generator:  https://www.unlocktheinbox.com/dmarcwizard/

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Enable DNSBL or RBL on Zimbra

Rumi, January 26, 2019

DNS-based Blackhole List (DNSBL) or Real-time Blackhole List (RBL) is an effort to fight spam emails. It is a blacklist of source IP addresses that have a reputation of sending spam emails. Most email systems can be configured to check these lists and block or flag emails that were sent…

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SSH Tunnel on PuTTY

Rumi, January 5, 2019

Most of you have probably used a tunnel with an SSH connection. What you probably weren’t aware of is that you can use a dynamic tunnel to access all remote infrastructure. Furthermore, you can specify a port and a destination IP to have direct access. This process is achieved through…

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ZImbra troubleshooting incoming mail problems

Rumi, January 3, 2019

Problem If you’re having trouble receiving mail from outside, you need to find out where the message is failing. When sending your test message, check the Log Files, especially /var/log/zimbra.log, on your MTA server. It’s often helpful to tail the logfile as you send the message: tail -f /var/log/zimbra.log If…

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Reset Vesta CP (vestacp) admin password

Rumi, December 31, 2018

Method 1 Login to your server via SSH. Enter the below command to change the password. $ v-change-user-password admin newpassword Replace the newpassword field with the new password you want to set. Method 2 Login to your server via SSH. Enter command following command. $ passwd admin Enter new UNIX…

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Clean up boot partition – Ubuntu 14.04LTS-x64, Ubuntu 16.04LTS-x64

Rumi, December 27, 2018

Case I: if /boot is not 100% full and apt is working   1. Check the current kernel version $ uname -r It will shows the list like below: 3.19.0-64-generic 2. Remove the OLD kernels 2.a. List the old kernel $ sudo dpkg –list ‘linux-image*’|awk ‘{ if ($1==”ii”) print $2}’|grep…

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Ubuntu old repository add

Rumi, November 21, 2018

If you want to continue using an outdated release then edit /etc/apt/sources.list and change archive.ubuntu.com and security.ubuntu.com to old-releases.ubuntu.com. You can do this with sed: sudo sed -i -re ‘s/([a-z]{2}\.)?archive.ubuntu.com|security.ubuntu.com/old-releases.ubuntu.com/g’ /etc/apt/sources.list then update with: sudo apt-get update && sudo apt-get dist-upgrade Sometimes, it might be faster to create backups of your system and reinstall using supported release instead.

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Configure iSCSI Initiator (client) in CentOS / RHEL 6

Rumi, October 30, 2018

To use RHEL/CentOS 6 system as an iSCSI initiator or client, you must have iscsi-initiator-utils package installed. You can verify that this is installed on your system using the rpm command, as shown in the following example: $ rpm -qa | grep iscsi-initiator-utils Install the package if its not already…

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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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