Starting and stopping our cluster

Hadoop provides some really nice scripts for starting and stopping everything

-bash-4.2$ start-all.sh 
starting namenode, logging to /usr/local/hadoop-1.0.3/libexec/../logs/hadoop-hduser-namenode-peter.test.net.out
localhost: starting datanode, logging to /usr/local/hadoop-1.0.3/libexec/../logs/hadoop-hduser-datanode-peter.test.net.out
localhost: starting secondarynamenode, logging to /usr/local/hadoop-1.0.3/libexec/../logs/hadoop-hduser-secondarynamenode-peter.test.net.out
starting jobtracker, logging to /usr/local/hadoop-1.0.3/libexec/../logs/hadoop-hduser-jobtracker-peter.test.net.out
localhost: starting tasktracker, logging to /usr/local/hadoop-1.0.3/libexec/../logs/hadoop-hduser-tasktracker-peter.test.net.out

-bash-4.2$ stop-all.sh 
stopping jobtracker
localhost: stopping tasktracker
stopping namenode
localhost: stopping datanode
localhost: stopping secondarynamenode

We don't use these command on multi-node clusters though