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… Continue Reading
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… Continue Reading
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… Continue Reading
Linux Tune Network Stack (Buffers Size) To Increase Networking Performance Rumi, December 23, 2015 By default the Linux network stack is not configured for high speed large file transfer across WAN links. This is done to save memory resources. You can easily tune Linux network stack by increasing network buffers size for high-speed networks that connect server systems to handle more network packets. The… Continue Reading
How to Encrypt VNC Traffic with Putty Rumi, December 9, 2015 By default, VNC is not secure protocol.VNC uses encryption during initial connection and login (passwords are not sent in plain-text). Once, we connected then all the VNC data is unencrypted and hacker could sniff our VNC session. It is better (safer) to start VNC server only on 127.0.0.1(localhost) and tunnel it… Continue Reading
SVN Server on Ubuntu 12.04 LTS with Web Access Rumi, December 9, 2015December 9, 2015 To install SVN server, run this command at the command prompt: sudo apt-get install subversion libapache2-svn apache2 Make the directory where you want to keep the svn repositories and edit the dav_svn.conf file: sudo mkdir /svn sudo nano /etc/apache2/mods-enabled/dav_svn.conf Delete all the data and make it simple like this 🙂 <Location… Continue Reading
How to Update SSH & MOTD Banner on CentOS 6 Rumi, December 7, 2015December 7, 2015 For legal reasons, Some people need to display a warning banner on their Linux machine before login so that a person requires to acknowledge the contents of the banner before entering the password. To do this, edit a/etc/issue.net file and fill it with the desired context. Edit the /etc/issue.net file: sudo… Continue Reading
Secure RDP connection through Vyatta using PuTTY Rumi, December 6, 2015 Connecting to SSH Server as gateway instead of directly RDP to a PC is safer way and add another layer ofencryption.With this method,we can connect to any client that is behind the firewall provided that we have open the port 22 (or any other SSH port) to the SSH Server…. Continue Reading
IP Setting on CentOS6 using Shell Script Rumi, December 6, 2015 #!/bin/bash if [ $# -eq 5 ] then echo “” echo “Taking the backup and Changing the hostname from $(hostname) to $1 …” sed -i.bk “s/$(hostname)/$1/g” /etc/sysconfig/network echo “” echo “Backing up & Assigning the Static IP …” echo “” cp /etc/sysconfig/network-scripts/ifcfg-$2 /etc/sysconfig/network-scripts/$2.bk cat <<EOF > /etc/sysconfig/network-scripts/ifcfg-$2 DEVICE=$2 BOOTPROTO=static IPADDR=$3.$4… Continue Reading
Check Hardware Commands in Linux Rumi, November 5, 2015 1. lscpu The lscpu command reports information about the cpu and processing units. It does not have any further options or functionality. $ lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 4 On-line CPU(s) list: 0-3 Thread(s) per core: 1 Core(s) per socket: 4 Socket(s): 1… Continue Reading