ssh无密登录_集群分发脚本xsync

1、ssh免密登录

ssh ip地址

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[root@192 ~]# ssh 192.168.1.102
root@192.168.1.102's password: 
Last login: Mon Feb 18 20:40:28 2019 from 192.168.1.101

免密登录配置

生成公钥和私钥

[root@192 ~]# ssh-keygen -t rsa 
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
d4:95:6c:a8:21:9b:27:62:79:43:76:e8:4b:32:6c:fe root@192.168.1.101
The key's randomart image is:
+--[ RSA 2048]----+
|       .   o..   |
|      = o...+    |
|   . = =.o..     |
|    O O.o        |
|   + * =S        |
|    . .          |
|     .           |
|      E          |
|                 |
+-----------------+
[root@192 ~]# ls /root/.ssh/
id_rsa  id_rsa.pub

将公钥拷贝到要免密登录的目标机器上

.ssh文件夹下（~/.ssh）的文件功能解释
（1）known_hosts ：记录ssh访问过计算机的公钥(public key)
（2）id_rsa ：生成的私钥
（3）id_rsa.pub ：生成的公钥
（4）authorized_keys ：存放授权过得无密登录服务器公钥


[root@192 ~]# hostname 
192.168.1.101
[root@192 ~]# ssh-copy-id 192.168.1.102
The authenticity of host '192.168.1.102 (192.168.1.102)' can't be established.
RSA key fingerprint is 56:57:4c:81:94:e0:47:fe:1e:aa:8c:9c:2a:87:a6:dc.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.1.102' (RSA) to the list of known hosts.
root@192.168.1.102's password: 
Now try logging into the machine, with "ssh '192.168.1.102'", and check in:

  .ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

[root@192 ~]# ls /root/.ssh/
id_rsa  id_rsa.pub  known_hosts
[root@192 ~]# ssh 192.168.1.102
Last login: Mon Feb 18 22:50:53 2019 from 192.168.1.101
[root@192 ~]# ls /root/.ssh/
authorized_keys

2、集群分发脚本xsync

服务器与服务器数据拷贝

rsync和scp区别：用rsync做文件的复制要比scp的速度快，rsync只对差异文件做更新。scp是把所有文件都复制过去。

scp

1 2	[root@192 ~]# scp -r /tmp/1.txt root@192.168.1.102:/tmp/ 1.txt

rsync

选项功能
-r 递归
-v 显示复制过程
-l 拷贝符号连接

[root@192 ~]# rsync -rvl /tmp/2.txt root@192.168.1.102:/tmp/
sending incremental file list
2.txt

sent 84 bytes  received 31 bytes  76.67 bytes/sec
total size is 13  speedup is 0.11

集群分发脚本xsync

[root@192 ~]# mkdir bin
[root@192 ~]# cd bin/
[root@192 bin]# touch xsync
[root@192 bin]# vim xsync
[root@192 bin]# chmod 777 xsync

#!/bin/bash
#1 获取输入参数个数，如果没有参数，直接退出
pcount=$#
if((pcount==0)); then
echo no args;
exit;
fi

#2 获取文件名称
p1=$1
fname=`basename $p1`
echo fname=$fname

#3 获取上级目录到绝对路径
pdir=`cd -P $(dirname $p1); pwd`
echo pdir=$pdir

#4 获取当前用户名称
user=`whoami`

#5 循环
for((host=102; host<104; host++)); do
        echo --------------------- 192.168.1.$host ----------------
        rsync -rvl $pdir/$fname $user@192.168.1.$host:$pdir
        #echo  ------"rsync -rvl $pdir/$fname $user@192.168.1.$host:$pdir complete"------------


done

xsync调用

[root@192 bin]# xsync /tmp/1.txt /tmp/
fname=1.txt
pdir=/tmp
--------------------- 192.168.1.102 ----------------
sending incremental file list
1.txt

sent 516 bytes  received 31 bytes  364.67 bytes/sec
total size is 445  speedup is 0.81
--------------------- 192.168.1.103 ----------------
The authenticity of host '192.168.1.103 (192.168.1.103)' can't be established.
RSA key fingerprint is 56:57:4c:81:94:e0:47:fe:1e:aa:8c:9c:2a:87:a6:dc.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.1.103' (RSA) to the list of known hosts.
root@192.168.1.103's password: 
sending incremental file list
1.txt

sent 71 bytes  received 37 bytes  5.84 bytes/sec
total size is 445  speedup is 4.12