hadoop(五)scp命令copy文件和配置(完全分布式准备二)|7

机器的克隆参考centos7克隆ip|机器名|映射关系|别名配置（hadoop完全分布式准备一）

那么问题来了，如果我们有30台机器，之间可以互相访问，那我们如何快速安装配置环境如jdk hadoop等？
可通过scp命令将配置、下载好的工具等直接copy到我们新的机器上就可以了。

scp(secure copy)安全copy

Scp定义：
Scp可以实现服务器与服务器之间的数据copy。（from server1 to server2）
基本语法

Scp     -r         $pair/$fname                 $user@hadoop&host:$pdir/$fname
命令  递归      要copy的文件路径/名称             目标用户@主机：目标路径名称

操作实例
在hadoop101上，将hadoop101中/opt/module目录下的软件copy到hadoop102上。

scp/opt/module shaozhiqi@hadoop102:/opt

实际操作时发现报错了：

[shaozhiqi@hadoop101 ~]$ scp -r /opt/module shaozhiqi@hadoop102: /opt
^Z
[1]+ Stopped scp -r /opt/module shaozhiqi@hadoop102: /opt/
[shaozhiqi@hadoop101 ~]$ scp -r /opt/module  shaozhiqi@hadoop102:/opt/
ssh: Could not resolve hostname hadoop102: Name or service not kno
lost connection

那就去修改hadoop101的/etc/hosts
添加上与102/103/104等机器的映射配置，否则在执行命令时只能使用ip

[shaozhiqi@hadoop101 ~]$ vi /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.1.101 hadoop101
192.168.1.102 hadoop102
192.168.1.103 hadoop103
192.168.1.104 hadoop104
192.168.1.105 hadoop105
192.168.1.106 hadoop106
192.168.1.107 hadoop107
192.168.1.108 hadoop108

Reboot后
再次执行scp

[shaozhiqi@hadoop101 ~]$ scp -r /opt/module shaozhiqi@hadoop102: /opt/module
[shaozhiqi@hadoop102 module]$ ll
total 8
drwxr-xr-x. 15 shaozhiqi shaozhiqi 4096 Jun 22 22:04 hadoop-3.1.2
drwxr-xr-x. 7 shaozhiqi shaozhiqi 4096 Jun 22 21:59 jdk1.8.0_211
[shaozhiqi@hadoop102 module]$

在103上将101的数据copy过来 ./表示当前目录

[shaozhiqi@hadoop103 module]$ scp –r  shaozhiqi@hadoop101:/opt/module ./
[shaozhiqi@hadoop103 module]$ ll
total 8
drwxr-xr-x. 15 shaozhiqi shaozhiqi 4096 Jun 22 22:41 hadoop-3.1.2
drwxr-xr-x. 7 shaozhiqi shaozhiqi 4096 Jun 22 22:26 jdk1.8.0_211
[shaozhiqi@hadoop103 module]$

在103copy 102module到104,执行命令输入102和104的密码

[shaozhiqi@hadoop103 module]$ scp -r shaozhiqi@hadoop102:/opt/module shaozhiqi@hadoop104:/opt/

如果之前没有module，需要用root用户执行scp
那么执行结束后就需要执行chown进行授权

[shaozhiqi@hadoop103 opt]$ cd module/
[shaozhiqi@hadoop103 module]$ ll
total 8
drwxr-xr-x. 15 root root 4096 Jun 23 00:21 hadoop-3.1.2
drwxr-xr-x. 7 root root 4096 Jun 23 00:19 jdk1.8.0_211
[shaozhiqi@hadoop103 opt]$ sudo chown shaozhiqi:shaozhiqi module/ -R
[shaozhiqi@hadoop103 opt]$ ll
total 0
drwxr-xr-x. 4 shaozhiqi shaozhiqi 44 Jun 23 00:19 module
drwxr-xr-x. 2 shaozhiqi shaozhiqi 6 Jun 18 05:58 software

将101上配置的环境变量copy过来
cat /etc/profile

[shaozhiqi@hadoop101 ~]$ scp /etc/profile root@hadoop102:/etc/profile
root@hadoop102's password:
profile 100% 1985 1.9KB/s 00:00   
[shaozhiqi@hadoop101 ~]$ scp /etc/profile root@hadoop103:/etc/profile
root@hadoop103's password:
profile 100% 1985 1.9KB/s 00:00   
[shaozhiqi@hadoop101 ~]$ scp /etc/profile root@hadoop104:/etc/profile
root@hadoop104's password:
profile 100% 1985 1.9KB/s 00:00   
[shaozhiqi@hadoop101 ~]$

重新加载环境配置
source /etc/profile
java –version
如果是openJKD则可删除
删除方式参考[Hadoop学习(一) centos7 jdk安装,hadoop安装
删除后再次
source /etc/profile
验证

[shaozhiqi@hadoop103 ~]$ java -version
java version "1.8.0_211"
Java(TM) SE Runtime Environment (build 1.8.0_211-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.211-b12, mixed mode)
[shaozhiqi@hadoop103 ~]$