1. ssh Secret-Free Login
ssh ip address
[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
Secret-free login configuration
Generating public and private keys
[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
Copy the public key to the target machine to be secret-free login
Explanation of File Function under (~/.ssh) Folder
(1) known_hosts: Record ssh's access to the computer's public key
(2) id_rsa: Generated private key
(3) id_rsa.pub: generated public key
(4) authorized_keys: Store the public key of an authorized login server without secret access
[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. Cluster distribution script xsync
Server and Server Data Copy
The difference between rsync and SCP is that rsync copies files faster than scp, rsync only updates different files. SCP copies all the files.
scp
[root@192 ~]# scp -r /tmp/1.txt root@192.168.1.102:/tmp/
1.txt
rsync
Option function
-r recursion
- v Displays the replication process
- l Copy Symbol Connection
[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
Cluster distribution script 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 Get the number of input parameters, if no parameters, exit directly
pcount=$#
if((pcount==0)); then
echo no args;
exit;
fi
#2 Get the file name
p1=$1
fname=`basename $p1`
echo fname=$fname
#3 Get directory to absolute path
pdir=`cd -P $(dirname $p1); pwd`
echo pdir=$pdir
#4 Get the current user name
user=`whoami`
#5 cycle
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 call
[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