namenode datanode and sec name node not getting started when i hit jps command - hadoop

Question

I was using Hadoop 1.2.1 in a pseudo-distributed mode in Ubuntu and everything was working fine. But then I had to restart my system . And now when I am hit jps command after giving start-all.sh i was able to see only tasktracker and jobtracker running. Could anyone tell me the possible reason of this problem? and guide me getting this resolved?
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2017-03-13 18:41:16,733 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting DataNode
STARTUP_MSG: host = keerthana-VirtualBox/127.0.1.1
STARTUP_MSG: args = []
STARTUP_MSG: version = 1.2.1
STARTUP_MSG: build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.2 -r 1503152; compiled by 'mattf' on Mon Jul 22 15:23:09 PDT 2013
STARTUP_MSG: java = 1.8.0_121
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2017-03-13 18:41:19,383 INFO org.apache.hadoop.metrics2.impl.MetricsConfig: loaded properties from hadoop-metrics2.properties
2017-03-13 18:41:19,628 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source MetricsSystem,sub=Stats registered.
2017-03-13 18:41:19,653 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Scheduled snapshot period at 10 second(s).
2017-03-13 18:41:19,653 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: DataNode metrics system started
2017-03-13 18:41:21,947 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source ugi registered.
2017-03-13 18:41:22,117 WARN org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Source name ugi already exists!
2017-03-13 18:41:23,564 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Invalid directory in dfs.data.dir: Incorrect permission for /home/keerthana/hadoop/dfs/data, expected: rwxr-xr-x, while actual: rwxrwxr-x
2017-03-13 18:41:23,564 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: All directories in dfs.data.dir are invalid.
2017-03-13 18:41:23,564 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Exiting Datanode
2017-03-13 18:41:23,630 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down DataNode at keerthana-VirtualBox/127.0.1.1
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Answer 1

As suggested from the logs, there are some problems with the dfs.data.dir "/home/keerthana/hadoop/dfs/data" location.
Provide check if the folder exists or not and whether they have the proper permission or not. If folder exists , then provide 755 access for that folder.
chmod -R 755 /home/keerthana/hadoop/dfs/data