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Category: Administrations

Install LibreNMS Monitoring Tool with Nginx on Ubuntu 20.04

Rumi, March 30, 2021March 30, 2021

First, it is recommended to update your system packages to the latest version. You can do it with the following command: apt-get update -y After updating all packages, install all the dependencies required for LibreNMS with the following command: apt-get install rrdtool whois fping imagemagick graphviz mtr-tiny nmap python3-mysqldb snmp…

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Setup mail server on centos 7 using postfix and dovecot

Rumi, March 30, 2021

Installing packages Step 1 » Assign hostname for the server using the below command. [root@krizna ~]# hostnamectl set-hostname mail.krizna.com Step 2 » Make a host entry with your IP in /etc/hosts file. 172.27.0.51 mail.krizna.com Step 3 » Now start installing packages. [root@krizna ~]# yum -y install postfix dovecot After package…

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Sectigo SSL certificate installation on Zimbra

Rumi, March 30, 2021

1. Login to your Zimbra Admin Console using a browser. 2. In the left navigation pane under Home click Configure. Click Certificate. 3. On the right of the Zimbra Admin console click on the settings icon and select Install Certificate. 4. The Certificate Installation Wizard will pop up. 5. Under…

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Install LAMP with PHP 7.4 on FastCGI/CGI configuration on CentOS 7

Rumi, March 24, 2021

Step 1 – Setup Yum Repository In the first step install all the required yum repositories in your system used in the remaining tutorial for various installations. You are adding REMI, EPEL, Webtatic & MySQL community server repositories in your system. CentOS / RHEL 7 yum install epel-release rpm -Uvh…

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How to enable Proxy Settings for Yum Command on RHEL / CentOS Servers

Rumi, March 24, 2021

This can be easily achieved with yum config file “/etc/yum.conf“. Under main section define the proxy settings like below: ……………… proxy=http://<Proxy-Server-IP-Address>:<Proxy_Port> proxy_username=<Proxy-User-Name> proxy_password=<Proxy-Password> ……………… Save and exit the file and start using the yum command. Sample yum Config file with proxy settings is shown below :

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Ping behind proxy using httping

Rumi, March 5, 2021

You can use utility httping for that. It sends a HEAD request (by default) to a web server and measures the time it took to get a response. The utility is available through a number of repositories for different OS’es and Linux distros: Ubuntu: sudo apt install httping Alpine: sudo…

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Manually purge data from Graylog 2.1

Rumi, March 1, 2021March 1, 2021

First aid: check which indices are present: curl http://localhost:9200/_cat/indices Then delete the oldest indices (you should not delete all) curl -XDELETE http://localhost:9200/graylog_1 curl -XDELETE http://localhost:9200/graylog_2 curl -XDELETE http://localhost:9200/graylog_3 Fix: You can then reduce the parameter elasticsearch_max_number_of_indices in /etc/graylog/server/server.conf to a value that fits your disk. Src: https://stackoverflow.com/questions/39502069/how-to-manually-purge-data-from-graylog-2-1

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Install Rainloop on PHP 5.6 on Debian 8 LAMP

Rumi, February 12, 2021

Step-1: Install LAMP on Debian I’ve used a bash script to install LAMP. You may find it useful. #!/bin/bash ######################################################## ### This script is created by Hasn T. Emdad Rumi <h.t.emdad@gmail.com>. ### Released under GPL 2.0 licensing ### Date: 12-Aug-2016 ######################################################## echo “Updating Debian Repository…” apt-get install debian-keyring debian-archive-keyring -y…

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E: Release file for http://archive.debian.org/debian/dists/jessie-backports/InRelease is expired (invalid since 715d 18h 14min 9s). Updates for this repository will not be applied Update Wheezy or Jessie Repo

Rumi, February 6, 2021

Wheezy and jessie both has gone EOL and repos too. archive repo doesn’t seem to usually work either. So here’s a little trick that worked for me. Below is my repo.list file- deb http://archive.debian.org/debian jessie main deb http://archive.debian.org/debian-archive/debian-security/ jessie updates/ma$ #deb http://security.debian.org/ jessie/updates non-free contrib main #deb http://mirrors.ocf.berkeley.edu/debian/ jessie-updates main…

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Updating Webmin Logo

Rumi, January 21, 2021January 21, 2021

On a default installation, your Webmin login page looks like below: To suppress both the Webmin logo and the “Webmin” text from the login page, add below to Webmin > Webmin Configuration > Webmin Themes > Theme Extensions:

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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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