[root@mysqld ~]# mysql -uroot -h 192.168.1.35 -p
Enter password:
ERROR 1130 (HY000): Host '192.168.1.66' is not allowed to connect to this MySQL server
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下表可見3306端口沒打開:
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[root@v01-svn-test-server online]# service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:22
2 ACCEPT all -- 127.0.0.1 127.0.0.1
3 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80
Chain FORWARD (policy ACCEPT)
num target prot opt source destination
Chain OUTPUT (policy ACCEPT)
num target prot opt source destination
1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spt:22 state ESTABLISHED
2 ACCEPT all -- 127.0.0.1 0.0.0.0/0
3 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spt:80 state ESTABLISHED
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[root@v01-svn-test-server online]# iptables -A INPUT -p tcp -s 192.168.1.66 --dport 3306 -j ACCEPT
[root@v01-svn-test-server online]# service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:22
2 ACCEPT all -- 127.0.0.1 127.0.0.1
3 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80
4 ACCEPT tcp -- 192.168.1.66 0.0.0.0/0 tcp dpt:3306
Chain FORWARD (policy ACCEPT)
num target prot opt source destination
Chain OUTPUT (policy ACCEPT)
num target prot opt source destination
1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spt:22 state ESTABLISHED
2 ACCEPT all -- 127.0.0.1 0.0.0.0/0
3 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spt:80 state ESTABLISHED
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建個遠程賬戶：
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mysql> select user,host,password from user;
+------+-----------+-------------------------------------------+
| user | host | password |
+------+-----------+-------------------------------------------+
| root | localhost | *23AE809DDACAF96AF0FD78ED04B6A265E05AA257 |
+------+-----------+-------------------------------------------+
1 row in set (0.06 sec)
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mysql> grant select on *.* to "select_user"@"%" identified by "123";
Query OK, 0 rows affected (0.10 sec)
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mysql> select user,host,password from user;
+-------------+-----------+-------------------------------------------+
| user | host | password |
+-------------+-----------+-------------------------------------------+
| root | localhost | *23AE809DDACAF96AF0FD78ED04B6A265E05AA257 |
| select_user | % | *23AE809DDACAF96AF0FD78ED04B6A265E05AA257 |
+-------------+-----------+-------------------------------------------+
2 rows in set (0.00 sec)
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成功連入遠程連入mysql服務器:
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[root@mysqld ~]# mysql -uselect_user -h192.168.1.35 -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 13
Server version: 5.5.40-log MySQL Community Server (GPL)
Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>
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關掉3306端口，再次測試:
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[root@v01-svn-test-server online]# iptables -D INPUT -p tcp -s 192.168.1.66 --dport 3306 -j ACCEPT
[root@v01-svn-test-server online]# service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:22
2 ACCEPT all -- 127.0.0.1 127.0.0.1
3 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80
Chain FORWARD (policy ACCEPT)
num target prot opt source destination
Chain OUTPUT (policy ACCEPT)
num target prot opt source destination
1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spt:22 state ESTABLISHED
2 ACCEPT all -- 127.0.0.1 0.0.0.0/0
3 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spt:80 state ESTABLISHED
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[root@v01-svn-test-server online]# iptables -P INPUT DROP
[root@v01-svn-test-server online]# iptables -P OUTPUT DROP
[root@v01-svn-test-server online]# iptables -P FORWARD DROP
[root@v01-svn-test-server online]# service iptables status
Table: filter
Chain INPUT (policy DROP)
num target prot opt source destination
1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:22
2 ACCEPT all -- 127.0.0.1 127.0.0.1
3 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80
Chain FORWARD (policy DROP)
num target prot opt source destination
Chain OUTPUT (policy DROP)
num target prot opt source destination
1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spt:22 state ESTABLISHED
2 ACCEPT all -- 127.0.0.1 0.0.0.0/0
3 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spt:80 state ESTABLISHED
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[root@mysqld ~]# mysql -uselect_user -h192.168.1.35 -p
Enter password:
#卡主無法鏈接
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重新開啟3306端口:
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[root@v01-svn-test-server online]# service iptables status
Table: filter
Chain INPUT (policy DROP)
num target prot opt source destination
1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:3306
2 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:22
3 ACCEPT all -- 127.0.0.1 127.0.0.1
4 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80
Chain FORWARD (policy DROP)
num target prot opt source destination
Chain OUTPUT (policy DROP)
num target prot opt source destination
1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spt:3306
2 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spt:22 state ESTABLISHED
3 ACCEPT all -- 127.0.0.1 0.0.0.0/0
4 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spt:80 state ESTABLISHED
[root@v01-svn-test-server online]# cat /etc/sysconfig/ip
ip6tables ip6tables.old iptables-config iptables.save
ip6tables-config iptables iptables.old
[root@v01-svn-test-server online]# cat /etc/sysconfig/iptables
# Generated by iptables-save v1.4.7 on Wed Jun 1 22:15:41 2016
*filter
:INPUT DROP [24:3081]
:FORWARD DROP [0:0]
:OUTPUT DROP [0:0]
-A INPUT -p tcp -m tcp --dport 3306 -j ACCEPT
-A OUTPUT -p tcp -m tcp --sport 3306 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -s 127.0.0.1/32 -d 127.0.0.1/32 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 80 -j ACCEPT
-A OUTPUT -p tcp -m tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT
-A OUTPUT -s 127.0.0.1/32 -j ACCEPT
-A OUTPUT -p tcp -m tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT
COMMIT
# Completed on Wed Jun 1 22:15:41 2016
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