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Category: Configurations (Linux)

Add windows client to zenoss monitoring

Rumi, September 27, 2015

Allow ICMP Through Firewall Firstly you need to allow incoming ICMP ping request since this is the way Zenoss checks if the system is online. Go to: Server Manager -> Configuration -> Windows Firewall with Advanced Security -> Inbound Rules Do the following: Enable rule “File and Printer Sharing (Echo…

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NFS Firewall

Rumi, September 9, 2015

Dynamic ports cannot be protected by port filtering firewalls such as iptables. First, you need to configure NFS services to use fixed ports. Open /etc/sysconfig/nfs, enter: # vi /etc/sysconfig/nfs Modify config directive as follows to set TCP/UDP unused ports: # TCP port rpc.lockd should listen on. LOCKD_TCPPORT=lockd-port-number # UDP port…

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NFS Server and Client on CentOS

Rumi, September 9, 2015

Assumptions: NFS Server IP: 172.16.5.100 NFS Client Node1: 172.16.5.101 NFS Client Node2: 172.16.5.102 NFS Client Node3: 172.16.5.103 NFS Client Node4: 172.16.5.104 On the NFS Server & All Client machine as well: yum install nfs-utils nfs-utils-lib Edit the exports file that shows what to share and with whom. So run:

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Enable mod_rewrite on Apache for Debian

Rumi, September 8, 2015

To enable and load mod_rewrite, do the following. $ sudo a2enmod rewrite Then open up the following file, and replace every occurrence of “AllowOverride None” with “AllowOverride all”. $ sudo vi /etc/apache2/sites-available/default or $ sudo vi /etc/apache2/sites-available/000-default Finally, restart Apache2. $ sudo service apache2 restart

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NMAP Security Scanner on Linux

Rumi, August 21, 2015February 11, 2017

First of all, you should get the “nmap” package installed in your system. On CentOS yum install nmap On Debian apt-get install nmap On Ubuntu sudo apt-get install nmap NMAP Commands: sudo nmap -sS [IP address] or [website address] sudo nmap -O –osscan-guess [IP address] or [website address] sudo nmap…

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PEN: HTTP Load Balancer

Rumi, August 15, 2015August 15, 2015

This is performed on a CentOS 6.x 64 bit machine Install pen which is lightweight simple Load Balancing software. It is TCP protocol based, so it’s possible to balance not only HTTP but SMTP, FTP, LDAP and so on. This example is based on the environment like follows. Configure Pen…

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perl(Net::SSLeay) is needed by webmin

Rumi, July 16, 2015

So the Webmin on Redhat/CentOS is now requiring this particular perl module to be pre-installed before the RPM installer begins. A very short cut to install this module by using yum- yum install -y perl-Net-SSLeay Voila! your done.

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Zimbra Domain Administration (Multi-tenant)

Rumi, June 4, 2015

In order to create a multi tenancy in zimbra OSA, can be acheived through a bash script below. Thanks to Ahmad Imanuddin (http://www.imanudin.com) for sharing this very useful script. cd /srv/ vi admin-delegate.sh Fill with the following line :

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Zimbra Increasing Attachment Size works for 8.5

Rumi, June 4, 2015

Through zimbraGUI didn’t find it how to do it, but through console it appeared to be working with the following set of commands to modify postfix actually- su zimbra zmprov mcf zimbraMtaMaxMessageSize 20971520 zmprov mcf zimbraFileUploadMaxSize 20971520 zmprov mcf zimbraMailContentMaxSize 52428800 zmprov modifyConfig zimbraMtaMaxMessageSize 52428800 postfix reload Once theyre executed,…

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Two Default Gateways on One System

Rumi, May 21, 2015

Problem Description You have built two or more network cards into one Linux system and each of these cards has its own default gateway. By default, you can only have one default gateway on a system. The case described would lead to asynchronous routing, whereby the router would reject the…

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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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