HDFS安装

HDFS启动

格式化文件系统

[[e-mail] ~]$ cd $HADOOP_HOME/bin
[[e-mail] bin]$ ls
hadoop  hadoop.cmd  hdfs  hdfs.cmd  mapred  mapred.cmd  rcc  yarn  yarn.cmd

查看hdfs都有什么命令可以用：

[[e-mail] bin]$ hdfs
Usage: hdfs [--config confdir] COMMAND
       where COMMAND is one of:
  dfs                  run a filesystem command on the file systems supported in Hadoop.
  namenode -format     format the DFS filesystem
  secondarynamenode    run the DFS secondary namenode
  namenode             run the DFS namenode
  journalnode          run the DFS journalnode
  zkfc                 run the ZK Failover Controller daemon
  datanode             run a DFS datanode
  dfsadmin             run a DFS admin client
  diskbalancer         Distributes data evenly among disks on a given node
  haadmin              run a DFS HA admin client
  fsck                 run a DFS filesystem checking utility
  balancer             run a cluster balancing utility
  jmxget               get JMX exported values from NameNode or DataNode.
  mover                run a utility to move block replicas across
                       storage types
  oiv                  apply the offline fsimage viewer to an fsimage
  oiv_legacy           apply the offline fsimage viewer to an legacy fsimage
  oev                  apply the offline edits viewer to an edits file
  fetchdt              fetch a delegation token from the NameNode
  getconf              get config values from configuration
  groups               get the groups which users belong to
  snapshotDiff         diff two snapshots of a directory or diff the
                       current directory contents with a snapshot
  lsSnapshottableDir   list all snapshottable dirs owned by the current user
						Use -help to see options
  portmap              run a portmap service
  nfs3                 run an NFS version 3 gateway
  cacheadmin           configure the HDFS cache
  crypto               configure HDFS encryption zones
  storagepolicies      list/get/set block storage policies
  version              print the version

文件系统格式化：

[[e-mail] bin]$ hdfs namenode -format

显示信息成功格式化：
20/07/13 16:55:35 INFO common.Storage: Storage directory /home/hadoop/app/tmp/dfs/name has been successfully formatted.

启动集群

[[e-mail] hadoop-2.6.0-cdh5.15.1]$ cd sbin
[[e-mail] sbin]$ ls
distribute-exclude.sh  hdfs-config.sh  mr-jobhistory-daemon.sh  start-all.sh       start-secure-dns.sh  stop-all.sh       stop-secure-dns.sh  yarn-daemons.sh
hadoop-daemon.sh       httpfs.sh       refresh-namenodes.sh     start-balancer.sh  start-yarn.cmd       stop-balancer.sh  stop-yarn.cmd
hadoop-daemons.sh      kms.sh          slaves.sh                start-dfs.cmd      start-yarn.sh        stop-dfs.cmd      stop-yarn.sh
hdfs-config.cmd        Linux           start-all.cmd            start-dfs.sh       stop-all.cmd         stop-dfs.sh       yarn-daemon.sh
[[e-mail] sbin]$ ./start-dfs.sh