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Category: Configurations (Linux)

Auto installation of Zenoss on CentOS 6

Rumi, June 19, 2016

The simplest way to install Zenoss Core 4.2 on a newly-deployed RHEL/CentOS 64-bit 5/6 system is to use our auto-deploy script, which downloads all required files for you. To use the script, first set up a new server running one of our supported operating systems. Then, as root, run the…

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413 Request Entity Too Large

Rumi, June 9, 2016

If you’re getting 413 Request Entity Too Large errors trying to upload with nginx.net/, you need to increase the size limit in nginx.conf . Add ‘client_max_body_size xxM’ inside the server section, where xx is the size (in megabytes) that you want to allow. http { include mime.types; default_type application/octet-stream; sendfile…

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Understanding NAT, Direct Routing & Tunneling

Rumi, May 3, 2016

Virtual Server via NAT The advantage of the virtual server via NAT is that real servers can run any operating system that supports TCP/IP protocol, real servers can use private Internet addresses, and only an IP address is needed for the load balancer. The disadvantage is that the scalability of…

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Testing Freeradius of Pfsense

Rumi, April 4, 2016April 4, 2016

FreeRADIUS offers an easy to use command line tool to check if the server is running and listening to incoming requests. Aninterface, a NAS/Client and a user must all be configured: Add a User with the following configuration:Username: testuser Password: testpassword Add a Client/NAS with the following configuration:IP-Address: 127.0.0.1 Shared…

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TeamViewer for Headless Linux Unattended System Access

Rumi, March 20, 2016

Googled for hours, couldn’t found a solid documentation on this. After many different stitching material- prepared a little moderate installation (at least it worked for me). My Linux OS is Debian 8.x- believe should work in other debian version and Ubuntu as well. But, before continuing this, make sure- You have…

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NFS fix on LXC Host Server

Rumi, March 17, 2016July 28, 2018

NFS client on LXC seems do not work. Why? The problem is apparmor on the real machine that block any appempt to mount NFS volumes. In order to try to minimize the security changes on apparmor I add the following lines in/etc/apparmor.d/lxc/lxc-default # allow nfs mount everywhere mount fstype=rpc_pipefs,  mount…

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Remote Administering pfsense

Rumi, March 15, 2016

To open the firewall GUI up completely, create a firewall rule to allow remote firewall administration – do not create a port forward or any other NAT configuration. Example Firewall Rule Setup Firewall > Rules, WAN Tab Action: pass Interface: WAN Protocol: TCP Source: Any (or restrict by IP/subnet) Destination:…

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Reverse Proxy with Caching

Rumi, February 15, 2016

A Sample Nginx Reverse proxy configuration- an alternative to Varnish cache (kind of more simplistic)- user www-data; worker_processes 4; pid /var/run/nginx.pid; events { worker_connections 768; # multi_accept on; } http { proxy_cache_path /cache levels=1:2 keys_zone=STATIC:10m inactive=24h max_size=1g; server { location / { proxy_pass http://127.0.0.1:8080; proxy_set_header Host $host; proxy_cache STATIC; proxy_cache_valid…

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Reinstalling MySQL on CentOS/Redhat 6

Rumi, February 7, 2016

Some time we faces issues with MySQL installation on Linux machine. If we simply remove MySQL packages and re-install doesn’t fixes the issue, in that case old settings may still exists on server which again affects new install. In that case first uninstall MySQL completely from system and erase all…

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Simple failover cluster using UCARP on Ubuntu (Heartbeat Alternative)

Rumi, January 24, 2016

In this tutorial, I’ll show you the steps to create a simple failover cluster on Ubuntu using CARP. To make the things meaningful,we’ll create the cluster for Apache service but you can use it for any other service, which relay on IP. Scenario: Here is my Setup: PrimarySrv: This is 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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Apache Bind Cacti CentOS CentOS 6 CentOS 7 Debain Debian Debian 10 Debian 11 Debian 12 DKIM Docker endian icinga iptables Jitsi LAMP Letsencrypt Linux Munin MySQL Nagios Nextcloud NFS nginx pfsense php Postfix powerdns Proxmox RDP squid SSH SSL Ubuntu Ubuntu 16 Ubuntu 18 Ubuntu 20 Varnish virtualbox vpn Webmin XCP-NG zimbra

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