转载地址：http://oldboy.blog.51cto.com/2561410/1915017
1）首先做好SSH密钥验证（跳板机地址192.168.33.128）[root@oldboy~]# useradd jump #<==要在所有机器上操作。 [root@oldboy~]# echo 123456|passwd --stdin jump #<==要在所有机器上操作。 Changingpassword for user jump. passwd:all authentication tokens updated successfully.以下操作命令仅在跳板机上操作：
[root@oldboy~]# su - jump [jump@oldboy~]$ ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa >/dev/null 2>&1 #<==生成密钥对。 [jump@oldboy~]$ ssh-copy-id -i ~/.ssh/id_dsa.pub 192.168.33.130 #<==将公钥分发到其他服务器。 Theauthenticity of host '192.168.33.130 (192.168.33.130)' can't be established. RSA keyfingerprint is fd:2c:0b:81:b0:95:c3:33:c1:45:6a:1c:16:2f:b3:9a. Are yousure you want to continue connecting (yes/no)? yes Warning:Permanently added '192.168.33.130' (RSA) to the list of known hosts. jump@192.168.33.130'spassword: Now trylogging into the machine, with "ssh '192.168.33.130'", and check in: .ssh/authorized_keys to makesure we haven't added extra keys that you weren't expecting. [jump@oldboy~]$ ssh-copy-id -i ~/.ssh/id_dsa.pub 192.168.33.129 #<==将公钥分发到其他服务器。 Theauthenticity of host '192.168.33.129 (192.168.33.129)' can't be established. RSA keyfingerprint is fd:2c:0b:81:b0:95:c3:33:c1:45:6a:1c:16:2f:b3:9a. Are yousure you want to continue connecting (yes/no)? yes Warning:Permanently added '192.168.33.129' (RSA) to the list of known hosts. jump@192.168.33.129'spassword: Now trylogging into the machine, with "ssh '192.168.33.129'", and check in: .ssh/authorized_keys to makesure we haven't added extra keys that you weren't expecting.2）实现传统的远程连接菜单选择脚本。
菜单脚本如下：
cat <<menu 1)oldboy-192.168.33.129 2)oldgirl-192.168.33.130 3)exit menu
3）利用linux信号防止用户中断信号在跳板机上操作。
functiontrapper () {
trap ':' INT EXIT TSTP TERM HUP #<==屏蔽这些信号。
}4）用户登录跳板机后即调用脚本（不能命令行管理跳板机），并只能按管理员的要求选单。以下为实战内容。
脚本放在跳板机上：
[root@oldboy~]# echo '[ $UID -ne 0 ] && . /server/scripts/jump.sh'>/etc/profile.d/jump.sh
[root@oldboy~]# cat /etc/profile.d/jump.sh
[ $UID-ne 0 ] && . /server/scripts/jump.sh
[root@oldboyscripts]# cat /server/scripts/jump.sh
#!/bin/sh
#oldboy training
trapper(){
trap ':' INT EXIT TSTP TERM HUP #<==定义需要屏蔽的信号，冒号表示啥都不做。
}
main(){
while :
do
trapper
clear
cat<<menu
1)Web01-192.168.33.129
2)Web02-192.168.33.130
menu
read -p"Pls input a num.:" num
case"$num" in
1)
echo 'login in 192.168.33.129.'
ssh 192.168.33.129
;;
2)
echo 'login in 192.168.33.130.'
ssh 192.168.33.130
;;
110)
read -p "your birthday:" char
if [ "$char" = "0926"];then
exit
sleep 3
fi
;;
*)
echo "select error."
esac
done
}
main执行效果如下：
[root@oldboy~]# su - jump #<==切到普通用户即弹出菜单，工作中直接用jump登录，即弹出菜单。 1)Web01-192.168.33.129 2)Web02-192.168.33.130 Pls inputa num.: 1)Web01-192.168.33.129 2)Web02-192.168.33.130 Pls inputa num.:1 #<==选1进入Web01服务器。 login in192.168.33.129. Lastlogin: Tue Oct 11 17:23:52 2016 from 192.168.33.128 [jump@littleboy~]$ #<==按ctrl+d退出到跳板机服务器再次弹出菜单。 1)Web01-192.168.33.129 2)Web02-192.168.33.130 Pls inputa num.:2 #<==选2进入Web02服务器。 login in192.168.33.130. Lastlogin: Wed Oct 12 23:30:14 2016 from 192.168.33.128 [jump@oldgirl~]$ #<==按ctrl+d退出到跳板机服务器再次弹出菜单。 1)Web01-192.168.33.129 2)Web02-192.168.33.130 Pls inputa num.:110 #<==选110进入跳板机命令提示符。 yourbirthday:0926 #<==需要输入特别码才能进入的，这里管理员通道，密码要保密呦。 [root@oldboyscripts]# #<==跳板机管理命令行。
