Year: 2013

Using Stunnel to Encrypt Unsecure Connections

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So you’re a fully signed up ‘tin foil hatter’ and you have an old app that communicates over the internet but doesn’t use SSL? Not to worry, there is a solution for you and its called stunnel. Stunnel is available for both Linux and Windows, and simply put creates an SSL tunnel from one machine…

Change Hostname Permanently on Debian or Ubuntu

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Debian based systems use the file /etc/hostname to read the hostname of the computer at boot time and set it up using the init script /etc/init.d/hostname.sh We can edit the file /etc/hostname and change the hostname and then run: /etc/init.d/hostname.sh start Steps: 1. sudo vim /etc/hostname 2. Save the file with the hostname you like…

Configuring Hadoop for Failover

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Introduction As of 0.20, Hadoop does not support automatic recovery in the case of a NameNode failure. This is a well known and recognized single point of failure in Hadoop. Experience at Yahoo! shows that NameNodes are more likely to fail due to misconfiguration, network issues, and bad behavior amongst clients than actual hardware problems. Out of fifteen grids…

Measuring Apache bandwidth from a bash script

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So reason : double checking Sawmill and AWstats. (sawmill won..) echo “$(awk ‘{print $10}’ prd.logs | grep -v “-” | paste -sd + – | bc )/1024/1024/1024″ | bc result is in GB. nJoy;