Welcome

Yes, I’ve decided to start a blog!

Hopefully with time it will be filled with useful snippets of code, interesting articles and general coding tips and tricks that I’ve found helpful during my career as a developer.

Feel free to comment on any articles that you either find interesting or useful, or if you have any questions about the content.

Enjoy!

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2 Responses to Welcome

  1. Vidyadhar says:

    Regarding load balancing :
    how to fix this problem
    RTNETLINK answers : file exists
    while running shell script for load balancing over 2 wan connections i.e eth0 and ppp0

    script for load balancing is like this :
    #!/bin/bash

    #bal_local Load-balance internet connection over two local links
    #
    # Version: 1.0.0 – Fri, Sep 26, 2008
    #
    # Author: Niels Horn
    #

    # Set devices:
    DEV1=${1-eth0} # default eth0
    DEV2=${2-ppp0} # default ppp0

    # Get IP addresses of our devices:
    ip1=`ifconfig $DEV1 | grep inet | awk ‘{ print $2 }’ | awk -F: ‘{ print $2 }’`
    ip2=`ifconfig $DEV2 | grep inet | awk ‘{ print $2 }’ | awk -F: ‘{ print $2 }’`

    # Get default gateway for our devices:
    gw1=`route -n | grep $DEV1 | grep ‘^0.0.0.0’ | awk ‘{ print $2 }’`
    gw2=`route -n | grep $DEV2 | grep ‘^0.0.0.0’ | awk ‘{ print $2 }’`

    echo “$DEV1: IP=$ip1 GW=$gw1”
    echo “$DEV2: IP=$ip2 GW=$gw2”

    ### Definition of routes ###

    # Check if tables exists, if not -> create them:
    if [ -z “`cat /etc/iproute2/rt_tables | grep ‘^251’`” ] ; then
    echo “251 rt_dev1” >> /etc/iproute2/rt_tables
    fi
    if [ -z “`cat /etc/iproute2/rt_tables | grep ‘^252’`” ] ; then
    echo “252 rt_dev2” >> /etc/iproute2/rt_tables
    fi

    # Define routing tables:
    ip route add default via $gw1 table rt_dev1
    ip route add default via $gw2 table rt_dev2

    # Create rules:

    ip rule add from $ip1 table rt_dev1
    ip rule add from $ip2 table rt_dev2

    # If we already have a ‘nexthop’ route, delete it:
    if [ ! -z “`ip route show table main | grep ‘nexthop’`” ] ; then
    ip route del default scope global
    fi

    # Balance links based on routes:
    ip route add default scope global nexthop via $gw1 dev $DEV1 weight 1 nexthop via $gw2 dev $DEV2 weight 1

    # Flush cache table:
    ip route flush cache

    # All done…

  2. Vidyadhar says:

    how can i use teql qdisc for load balancing

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