查看登录成功的用户信息

last | less 

	
	

		1
	

查看登录失败的用户信息

lastb | less 

	
	

		1
	

查看登录日志

tail /var/log/secure 

	
	

		1
	

限制IP登录

	vim /etc/hosts.deny



	 # # hosts.deny    This file contains access rules which are used to 



	#               deny connections to network services that either use



	 #               the tcp_wrappers library or that have been



	 #               started through a tcp_wrappers-enabled xinetd. 



	# #               The rules in this file can also be set up in 



	#               /etc/hosts.allow with a 'deny' option instead. 



	# #               See 'man 5 hosts_options' and 'man 5 hosts_access' 



	#               for information on rule syntax. 



	#               See 'man tcpd' for information on tcp_wrappers # 



	sshd:49.234.62.76:deny

sshd:218.122.198:deny
sshd:159.89.238.247:deny
sshd:49.235.156.117:deny
sshd:51.83.41.120:deny
sshd:121.228.255.99:deny