Log rotation is a way of managing old log files to reduce disk space usage on the server. By default logrotate is invoked once a day using a cron scheduler from location /etc/cron.daily/ grep logrotate.conf /etc/cron.daily/logrotate /usr/sbin/logrotate /etc/logrotate.conf >/dev/null 2>&1 Logrotation is manged by two different configuration files /etc/logrotate.conf [generic… Continue Reading Enabling log rotation on Linux Hosts

Consider scenario on large production system, when a new table is created or an alter table is triggered then we may need to notify few users. We came across a same scenario when the table schema or new table created, we need to notify few users. Assumption: Mysql general query… Continue Reading Send notification when alter, create table event occurs on mysql

Assumption: We have access key and secret key which has a privilege to create snapshot, delete snapshot, list volumes,etc., The script will keep 4 days retention and delete the old backups.   #!/usr/bin/python #Author:Dhanasekaran N #Email:dhanasekaran.n16@gmail.com,support@pheonixsolutions.com #Usage:python create_aws_snapshot.py AWS_TAG_NAME #Version:1.0 #Here come I……. from datetime import datetime, timedelta import datetime… Continue Reading Python Script to take backup of Ec2 Volume with days retention

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