到此第一个虚拟机配置的差不多了，把这个虚拟机拷贝两份(注意是完全复制，并且需要重置mac地址)，就有了三台虚拟机，分别为 master,slave1,slave2
修改slave1和slave2的hostname为slave1-hadoop,slave2-hadoop
修改三台机器的hosts
192.168.56.101 master
192.168.56.102 slave1
192.168.56.103 slave2
ip不一定，需要自己看下虚机的ip
配置master可以免密码登录其它两台机器和自己
在master上操作
ssh-keygen -t rsa -P ''，一切都选择默认操作，该输密码输密码
ssh-copy-id hadoop@master
ssh-copy-id hadoop@slave1
ssh-copy-id hadoop@slave2
完成之后测试一下ssh slave1 正常情况下应该不用密码就直接连接到slave1上
hadoop@master-hadoop ~ $ ssh-keygen -t rsa -P '' Generating public/private rsa key pair. Enter file in which to save the key (/home/hadoop/.ssh/id_rsa): Created directory '/home/hadoop/.ssh'. Your identification has been saved in /home/hadoop/.ssh/id_rsa. Your public key has been saved in /home/hadoop/.ssh/id_rsa.pub. The key fingerprint is: 5c:c9:4c:0c:b6:28:eb:21:b9:6f:db:6e:3f:ee:0d:9a hadoop@master-hadoop The key's randomart image is: +--[ RSA 2048]----+ | oo. | | o =.. | | . . . = | | . o . . | | o o S | | + . | | . . . | | ....o.o | | .o+E++.. | +-----------------+ hadoop@master-hadoop ~ $ ssh-copy-id hadoop@slave1 The authenticity of host 'slave1 (192.168.56.102)' can't be established. ECDSA key fingerprint is d8:fc:32:ed:a7:2c:e1:c7:d7:15:89:b9:f6:97:fb:c3. Are you sure you want to continue connecting (yes/no)? yes /usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed /usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys hadoop@slave1's password: Number of key(s) added: 1 Now try logging into the machine, with: "ssh 'hadoop@slave1'" and check to make sure that only the key(s) you wanted were added.
格式化namenode
./bin/hdfs namenode –format
启动hadoop验证一下
./sbin/start-all.sh
正常的日志应该是这样:
hadoop@master-hadoop /opt/hadoop/sbin $ ./start-all.sh This script is Deprecated. Instead use start-dfs.sh and start-yarn.sh Starting namenodes on [master] master: starting namenode, logging to /opt/hadoop/logs/hadoop-hadoop-namenode-master-hadoop.out slave1: starting datanode, logging to /opt/hadoop/logs/hadoop-hadoop-datanode-slave1-hadoop.out slave2: starting datanode, logging to /opt/hadoop/logs/hadoop-hadoop-datanode-slave2-hadoop.out Starting secondary namenodes [master] master: starting secondarynamenode, logging to /opt/hadoop/logs/hadoop-hadoop-secondarynamenode-master-hadoop.out starting yarn daemons starting resourcemanager, logging to /opt/hadoop/logs/yarn-hadoop-resourcemanager-master-hadoop.out slave1: starting nodemanager, logging to /opt/hadoop/logs/yarn-hadoop-nodemanager-slave1-hadoop.out slave2: starting nodemanager, logging to /opt/hadoop/logs/yarn-hadoop-nodemanager-slave2-hadoop.out
看下三个节点的jps