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http://blog.sina.com.cn/s/blog_5dbd618201011mwn.html
1 ssh服务
ssh(tcp 端口号22):安全的命令解析器
为客户机提高安全的shell环境,用于远程管理
SSH基于公钥加密(非对称加密)技术: 数据加密传输; 客户端和服务器的身份验证;
公钥 和 私钥 是成对生成的,这两个密钥互不相同,两个密钥可以互相加密和解密;
不能根据一个密钥而推算出另外一个密钥;
公钥对外公开,私钥只有私钥的持有人才知道;
2.安装
[root@yuguangyuan ssh]# yum install openssh* -y
3.查看安装结果
[root@yuguangyuan ssh]# rpm -qa | grep ssh
openssh-clients-5.3p1-118.1.el6_8.x86_64
openssh-server-5.3p1-118.1.el6_8.x86_64
openssh-ldap-5.3p1-118.1.el6_8.x86_64
libssh2-1.4.2-1.el6.x86_64
openssh-5.3p1-118.1.el6_8.x86_64
openssh-askpass-5.3p1-118.1.el6_8.x86_64
3.1.查看安装生成的文件
[root@yuguangyuan ssh]# rpm -ql openssh
/etc/ssh
/etc/ssh/moduli
/usr/bin/ssh-keygen
/usr/libexec/openssh
3.2 常用配置文件
/etc/ssh/ssh_config 客户端配置文件
/etc/ssh/sshd_config 服务端配置文件
4.启动
service sshd restart/stop/start/status
/etc/init.d/sshd restart/stop/start/status
/usr/sbin/sshd restart/stop/start/status
[root@yuguangyuan ssh]# service sshd status
openssh-daemon (pid 1394) is running...
[root@yuguangyuan ssh]# /etc/init.d/sshd status
openssh-daemon (pid 1394) is running...
4.1设置开机自启动
[root@yuguangyuan ssh]# chkconfig sshd on
[root@yuguangyuan ssh]# chkconfig --list sshd
sshd 0:off 1:off 2:on 3:on 4:on 5:on 6:off
[root@yuguangyuan ssh]#
4.2查看端口号:
http://www.cnblogs.com/peida/archive/2013/03/11/2953420.html(ss命令)
[root@yuguangyuan ssh]# netstat -anlptu | grep sshd
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1394/sshd
tcp 0 0 127.0.0.1:6010 0.0.0.0:* LISTEN 1317/sshd
tcp 0 52 192.168.1.130:22 192.168.1.107:11068 ESTABLISHED 1317/sshd
tcp 0 0 :::22 :::* LISTEN 1394/sshd
tcp 0 0 ::1:6010 :::* LISTEN 1317/sshd
[root@yuguangyuan ssh]# ss -tlunp | grep sshd
tcp LISTEN 0 128 :::22 :::* users:(("sshd",1394,4))
tcp LISTEN 0 128 *:22 *:* users:(("sshd",1394,3))
tcp LISTEN 0 128 127.0.0.1:6010 *:* users:(("sshd",1317,8))
tcp LISTEN 0 128 ::1:6010 :::* users:(("sshd",1317,7))
[root@yuguangyuan ssh]#
5.使用:
[root@yuguangyuan ssh]# useradd ygy && echo 123456 | passwd --stdin ygy
Changing password for user ygy.
passwd: all authentication tokens updated successfully.
[root@yuguangyuan ssh]# ssh ygy@192.168.1.130
ygy@192.168.1.130‘s password:
[ygy@yuguangyuan ~]$ w
07:18:14 up 53 min, 2 users, load average: 0.00, 0.00, 0.00
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
root pts/0 192.168.1.107 06:25 0.00s 0.12s 0.00s ssh ygy@192.168.1.130
ygy pts/1 192.168.1.130 07:18 0.00s 0.00s 0.00s w
使用root登陆 ssh 192.168.1.130
ssh -l ygy 192.168.1.130
ssh ygy@192.168.1.130
6.安全配置
修改默认端口
[root@yuguangyuan ssh]# vim sshd_config
重启:service sshd restart
[root@yuguangyuan ssh]# netstat -tlunp | grep sshd
tcp 0 0 127.0.0.1:6010 0.0.0.0:* LISTEN 1317/sshd
tcp 0 0 0.0.0.0:222 0.0.0.0:* LISTEN 1659/sshd
tcp 0 0 ::1:6010 :::* LISTEN 1317/sshd
tcp 0 0 :::222 :::* LISTEN 1659/sshd
指定端口-p
[root@yuguangyuan ssh]# ssh -p 222 192.168.1.130
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原文地址:http://www.cnblogs.com/yuguangyuan/p/5880085.html