This post may be useful if we want to keep track what your users are executing on the server. You can write some custom scripts incase of any abnormal activity being done by the user. Add the following line in /etc/bashrc export PROMPT_COMMAND=’RETRN_VAL=$?;logger -p local6.debug “$(whoami) [$$]: $(history 1 | sed… Continue Reading Enable command logging on Linux hosts

Scenario/Use case: Consider, we have a jumpbox which has access to all the production machine and we don’t want to expose SSH access to public. In such scenario, we can allow only jumpbox to public access and through jumpbox, we can access remaining machines. But, its a pain to login… Continue Reading Use jumpbox to ssh to servers

FUSE-based file system backed by Amazon S3. Mount a s3 bucket as a local file system to read/write. Since the bucket is mounted as a local file system, the  write/read operation is faster than when we read the file from s3 bucket directly. Install Dependencies: yum install gcc libstdc++-devel gcc-c++… Continue Reading S3Fs installation

Most of the renowned ESPs such as gmail or hotmail or yahoo do not like to mailed to from the same address multiple times in a short span. If they detect (and they will) that a server’s IP is sending out bursts of emails in short span of time or… Continue Reading Postfix : Rate limit based on recipients throttling

Assumption: AWS access key has a privilege to create snapshot. Aws Tag name has to be passed as an argument. Replace aws access key and secret key with proper keys #!/usr/bin/python #Author:Dhanasekaran N #Email:dhanasekaran.n16@gmail.com #Version:1.0 #Here come I……. from datetime import datetime, timedelta import datetime import time from dateutil import… Continue Reading Python script to take Amazon volume backup of an instance

This post guides you to install ffmpeg on ubuntu server. Let’s update all the repo’s on the host. apt-get update   Install the required package using apt-get install. apt-get -y –force-yes install autoconf automake build-essential libass-dev libfreetype6-dev libgpac-dev libsdl1.2-dev libtheora-dev libtool libva-dev libvdpau-dev libvorbis-dev libxcb1-dev libxcb-shm0-dev libxcb-xfixes0-dev pkg-config texi2html zlib1g-dev yasm… Continue Reading Install ffmepg on Ubuntu Server

1. Install Linux dependencies GCC and Make(On Redis Server) sudo yum -y install gcc make   2. Download, Untar and Make Redis 3.0 wget http://<Download the latest file from the redis official site> tar xzf redis-3.3.0-rc3.tar.gz cd redis-3.0.0-rc3 make   3. Create Directories and Copy Redis Files sudo mkdir /etc/redis /var/lib/redis… Continue Reading RedisMaster and Slave Setup

Follow the step by step instructions given below to install s3cmd tool:- =====  * Download the latest version of s3cmd through SourceForge (SourceForge – Latest released version is 1.5.2  ) and unzip it. Example: wget http://sourceforge.net/projects/s3tools/files/s3cmd/1.5.2/s3cmd-1.5.2.tar.gz * Change directory the s3cmd-1.5.2 (ie) “cd s3cmd-1.5.2″. * Install setup tools using below command: —— – For Debian OS use… Continue Reading S3cmd Installation on Linux

First thing to know is that you can use “telnet” (usually on default port 6397) telnet localhost 6397 or the Redis CLI client redis-cli to connect to Redis. The advantage of redis-cli is that you have a help interface and command line history. CLI Queries Here is a short list… Continue Reading Redis Common Commands

The below script is used to delete the same memcache key or multiple memcache keys across multiple memcache hosts. Assumption: If below mentioned condition doesn’t satisfied then the script may fail or may not work. All you have to do is modify/tweak the script as per your requirement Script assumes… Continue Reading Script to delete Memcache key on cluster