<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://localhost:9000</value>
</property>
</configuration>
如下图：
修改解压后的目录下的子目录文件 etc/hadoop/hdfs-site.xml
linuxidc@linuxidc:/opt/hadoop/hadoop-2.7.7/etc/hadoop$ sudo nano hdfs-site.xml
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
</configuration>
如下图：
设置免密登陆
linuxidc@linuxidc:~/www.linuxidc.com$ ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa
Generating public/private rsa key pair.
Your identification has been saved in /home/linuxidc/.ssh/id_rsa.
Your public key has been saved in /home/linuxidc/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:zY+ELQc3sPXwTBRfKlTwntek6TWVsuQziHtu3N/6L5w linuxidc@linuxidc
The key's randomart image is:
+---[RSA 2048]----+
| . o.*+. .|
| + B o o.|
| o o =o+.o|
| B..+oo=o|
| S.*. ==.+|
| +.o .oo.|
| .o.o... |
| oo .E .|
| .. o==|
+----[SHA256]-----+
linuxidc@linuxidc:~/www.linuxidc.com$ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
linuxidc@linuxidc:~/www.linuxidc.com$ chmod 0600 ~/.ssh/authorized_keys
使用命令：ssh localhost 验证是否成功，如果不需要输入密码即可登陆说明成功了。
linuxidc@linuxidc:~/www.linuxidc.com$ ssh localhost
Welcome to Ubuntu 18.04.3 LTS (GNU/Linux 5.4.0-999-generic x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage
* Canonical Livepatch is available for installation.
- Reduce system reboots and improve kernel security. Activate at:
https://ubuntu.com/livepatch
188 个可升级软件包。
0 个安全更新。
Your Hardware Enablement Stack (HWE) is supported until April 2023.
Last login: Sat Nov 30 23:25:35 2019 from 127.0.0.1
接下来需要验证Hadoop的安装
a、格式化文件系统
linuxidc@linuxidc:/opt/hadoop/hadoop-2.7.7$ bin/hdfs namenode -format
19/11/30 23:29:06 INFO namenode.NameNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG: host = linuxidc/127.0.1.1
STARTUP_MSG: args = [-format]
STARTUP_MSG: version = 2.7.7
......
b、启动Namenode和Datanode
linuxidc@linuxidc:/opt/hadoop/hadoop-2.7.7$ sbin/start-dfs.sh
Starting namenodes on [localhost]
localhost: starting namenode, logging to /opt/hadoop/hadoop-2.7.7/logs/hadoop-linuxidc-namenode-linuxidc.out
localhost: starting datanode, logging to /opt/hadoop/hadoop-2.7.7/logs/hadoop-linuxidc-datanode-linuxidc.out
Starting secondary namenodes [0.0.0.0]
The authenticity of host '0.0.0.0 (0.0.0.0)' can't be established.
ECDSA key fingerprint is SHA256:OSXsQK3E9ReBQ8c5to2wvpcS6UGrP8tQki0IInUXcG0.
Are you sure you want to continue connecting (yes/no)? yes
0.0.0.0: Warning: Permanently added '0.0.0.0' (ECDSA) to the list of known hosts.
0.0.0.0: starting secondarynamenode, logging to /opt/hadoop/hadoop-2.7.7/logs/hadoop-linuxidc-secondarynamenode-linuxidc.out
c、浏览器访问:50070
下载地址：https://www.scala-lang.org/download/2.11.8.html
下载好后解压到：/opt/scala