SSH remote execution script without password

SSH login with no password and remote execution script to use public and private keys. Linux can use Ssh-keygen to generate public/private key pair, below I take CentOS7 as an example.

Test environment: Machine A (10.0.224.80); machine B (192.168.7.172). Now want to a through SSH password-free on B to execute the command remotely.

1, first in a machine to generate a public/private key pair: (-p for password,-p ' means null password, a return can be.) In ~/.ssh will generate Id_rsa and id_rsa.pub two files)

[Email protected] home]#Ssh-keygen-T Rsa-p"'Generating Public/private RSA key pair. Enterfile inch whichTo save the key (/root/.SSH/Id_rsa): (direct carriage return)Your identification has been savedinch/root/.SSH/Id_rsa. Your public key has been savedinch/root/.SSH/id_rsa.pub.The Key fingerprint is:e8:a1:c0:cc:d 0:2c: the: the: *: 0f:c7: the: 2b: -: -: the[email protected]the key's Randomart image is:+--[RSA2048]----+|       +...O E. ||  ++ =.       * . || B O. o O | |.  *     +         ||   = O S | | .         O.    || .          .                 ||                 || |+-----------------+
[Email protected] home]# CD ~/.ssh/
[email protected]. ssh]# LL
Total Dosage 12
-RW-------. 1 root root 1675 April 5 13:27 Id_rsa
-rw-r--r--. 1 root root 395 April 5 13:27 id_rsa.pub
-rw-r--r--. 1 root root 2492 April 5 10:52 known_hosts

2, copy the Id_rsa.pub under the A machine to the B machine

[Email protected]. SSH SCP ~/. ssh/id_rsa.pub [email protected]192.168. 7.172:/home[email protected]192.168. 7.172 '  id_rsa.pub                                                                     395     0. 4kb/s   :  XX    

3, on the B machine, will be copied from a machine id_rsa.pub added to the ~/.ssh/authorzied_keys file, and give permission

cat /home/id_rsa.pub >> ~/. ssh/chmod ~/. ssh/authorized_keys

4, test (note, the first time you need to enter a Yes manually)

Execute remote command

[Email protected] home]#SSH[Email protected]192.168.7.172 "cd/home; LS"Calico.TarLaizynagiosubuntu.Tar[email protected] home]#SSH[Email protected]192.168.7.172 "ifconfig ens33"Ens33:flags=4163<UP,BROADCAST,RUNNING,MULTICAST> MTU theinet192.168.7.172Netmask255.255.255.0Broadcast192.168.7.255Inet6 fe80::20c:29ff:fecd:7e7c Prefixlen -ScopeID0x20<link>etherxx: 0c: in: cd:7e:7c Txqueuelen +(Ethernet) RX packets216165bytes20851014(19.8MiB) RX Errors0Dropped0Overruns0Frame0TX Packets198202bytes19741868(18.8MiB) TX Errors0Dropped0Overruns0Carrier0Collisions0[email protected] home]#

Password-free, Telnet

[Email protected] home]#SSH[Email protected]192.168.7.172 LastLogin: Tue APR5  A:Geneva: -  .From192.168.7.146[[Email protected]~]#ifconfigEns33ens33:flags=4163<UP,BROADCAST,RUNNING,MULTICAST> MTU theinet192.168.7.172Netmask255.255.255.0Broadcast192.168.7.255Inet6 fe80::20c:29ff:fecd:7e7c Prefixlen -ScopeID0x20<link>etherxx: 0c: in: cd:7e:7c Txqueuelen +(Ethernet) RX packets217411bytes20974871(20.0MiB) RX Errors0Dropped0Overruns0Frame0TX Packets199328bytes19856521(18.9MiB) TX Errors0Dropped0Overruns0Carrier0Collisions0

SSH remote execution script without password