Oracle 11g RAC 安装Oracle 11g RAC R2 之Linux DNS 配置
Oracle 11g RAC 集群中引入了SCAN(Single Client Access Name)的概念，也就是指集群的单客户端访问名称。SCAN 这个特性为客户端提供了单一的主机名，用于访问集群中运行的 Oracle 数据库。如果您在集群中添加或删除节点，使用 SCAN 的客户端无需更改自己的 TNS 配置。无论集群包含哪些节点，SCAN 资源及其关联的 IP 地址提供了一个稳定的名称供客户端进行连接使用。在Oracle 11g grid 安装时即要求为该特性配置DNS解析方式或GNS解析方式。本文描述了安装Oracle 11g grid时的DNS配置。
1. 1、安装环境
2. #配置DNS，可以使用单独的DNS服务器，也可以直接使用RAC的一个节点来提供DNS解析
3. #直接使用某个节点时，容易出现该节点如果宕机将导致SCAN无法解析，客户端无法连接数据库
4. #本文仅作演示，使用节点1的public ip用作dns，不考虑上面描述的情形以及DNS安全性等。
5. [root@node1 ~]# cat /etc/issue
6. Enterprise Linux Enterprise Linux Server release 5.5 (Carthage)
7. Kernel \r on an \m
8.
9. 2、主机节点host信息
10. [root@node1 ~]# more /etc/hosts
11. # Do not remove the following line, or various programs
12. # that require network functionality will fail.
13. #127.0.0.1 localhost.localdomain localhost
14. #::1 localhost6.localdomain6 localhost6
15.
16. 127.0.0.1 localhost.szdb.com localhost
17. # Public eth0
18. 192.168.7.71 node1.szdb.com node1 #该地址作为DNS服务器地址
19. 192.168.7.72 node2.szdb.com node2
20.
21. #Private eth1
22. 10.10.7.71 node1-priv.szdb.com node1-priv
23. 10.10.7.72 node2-priv.szdb.com node2-priv
24.
25. #Virtual
26. 192.168.7.81 node1-vip.szdb.com node1-vip
27. 192.168.7.82 node2-vip.szdb.com node2-vip
28.
29. #scan
30. 192.168.7.91 scan-cluster1.szdb.com scan-cluster1
31.
32. 3、配置dns需要用到的安装包
33. [root@node1 dns_rpm]# ls -hltr
34. total 1.1M
35. -rw-r--r-- 1 root root 45K Dec 7 18:04 bind-chroot-9.3.6-4.P1.el5_4.2.i386.rpm
36. -rw-r--r-- 1 root root 985K Dec 7 18:04 bind-9.3.6-4.P1.el5_4.2.i386.rpm
37. -rw-r--r-- 1 root root 61K Dec 7 18:04 caching-nameserver-9.3.6-4.P1.el5_4.2.i386.rpm
38.
39. #下面安装rpm包
40. [root@node1 dns_rpm]# rpm -Uvh bind-9.3.6-4.P1.el5_4.2.i386.rpm
41. warning: bind-9.3.6-4.P1.el5_4.2.i386.rpm: Header V3 DSA signature: NOKEY, key ID 1e5e0159
42. Preparing... ########################################### [100%]
43. 1:bind ########################################### [100%]
44. [root@node1 dns_rpm]# rpm -Uvh bind-chroot-9.3.6-4.P1.el5_4.2.i386.rpm
45. warning: bind-chroot-9.3.6-4.P1.el5_4.2.i386.rpm: Header V3 DSA signature: NOKEY, key ID 1e5e0159
46. Preparing... ########################################### [100%]
47. 1:bind-chroot ########################################### [100%]
48. [root@node1 dns_rpm]# rpm -Uvh caching-nameserver-9.3.6-4.P1.el5_4.2.i386.rpm
49. warning: caching-nameserver-9.3.6-4.P1.el5_4.2.i386.rpm: Header V3 DSA signature: NOKEY, key ID 1e5e0159
50. Preparing... ########################################### [100%]
51. 1:caching-nameserver ########################################### [100%]
52.
53. 4、配置DNS
54. #关于DNS的配置，分为以下几个步骤
55. #a.安装所需的rpm包
56. #b.配置named.conf文件
57. #c.配置zone文件，包括正向和反向zone文件
58. #d.配置解析文件resolv.conf
59. #e.启动dns服务
60. [root@node1 ~]# cd /var/named/chroot/etc/
61. #使用下面的方式复制两个新的副本并修改，参数-p表示连同权限及属主，属组一同复制。切记不可忽略参数-p
62. [root@node1 etc]# cp -p named.caching-nameserver.conf named.conf
63. [root@node1 etc]# cp -p named.rfc1912.zones named.zones
64.
65. #修改named.conf文件，将源文件中的所有localhost以及127.0.0.1修改成any，注意any;前后保留空格
66. #该文件主要是配置dns监听那些端口以及ip地址并指明相应的名字解析zone文件名named.zones
67. #下面是修改后的named.conf文件
68. [root@node1 ~]# cat /var/named/chroot/etc/named.conf
69. //
70. // named.caching-nameserver.conf
71. //
72. // Provided by Red Hat caching-nameserver package to configure the
73. // ISC BIND named(8) DNS server as a caching only nameserver
74. // (as a localhost DNS resolver only).
75. //
76. // See /usr/share/doc/bind*/sample/ for example named configuration files.
77. //
78. // DO NOT EDIT THIS FILE - use system-config-bind or an editor
79. // to create named.conf - edits to this file will be lost on
80. // caching-nameserver package upgrade.
81. //
82. options {
83. listen-on port 53 { any; };
84. listen-on-v6 port 53 { ::1; };
85. directory "/var/named";
86. dump-file "/var/named/data/cache_dump.db";
87. statistics-file "/var/named/data/named_stats.txt";
88. memstatistics-file "/var/named/data/named_mem_stats.txt";
89.
90. // Those options should be used carefully because they disable port
91. // randomization
92. // query-source port 53;
93. // query-source-v6 port 53;
94.
95. allow-query { any; };
96. allow-query-cache { any; };
97. };
98. logging {
99. channel default_debug {
100. file "data/named.run";
101. severity dynamic;
102. };
103. };
104. view localhost_resolver {
105. match-clients { any; };
106. match-destinations { any; };
107. recursion yes;
108. include "/etc/named.zones";
109. };
110.
111. #修改named.zones文件，该文件用于指定zone的搜索范围，包括正向和反向。文件末尾最后的两个zone为新增加的
112. #注意每一个zone的file用于指向真正的zone文件，后面要用到
113. # Author : Robinson
114. # Blog : http://blog.csdn.net/robinson_0612
115.
116. #下面是修改后的named.zones文件
117. [root@node1 ~]# cat /var/named/chroot/etc/named.zones
118. // named.rfc1912.zones:
119. //
120. // Provided by Red Hat caching-nameserver package
121. //
122. // ISC BIND named zone configuration for zones recommended by
123. // RFC 1912 section 4.1 : localhost TLDs and address zones
124. //
125. // See /usr/share/doc/bind*/sample/ for example named configuration files.
126. //
127. zone "." IN {
128. type hint;
129. file "named.ca";
130. };
131.
132. zone "localdomain" IN {
133. type master;
134. file "localdomain.zone";
135. allow-update { none; };
136. };
137.
138. zone "localhost" IN {
139. type master;
140. file "localhost.zone";
141. allow-update { none; };
142. };
143.
144. zone "0.0.127.in-addr.arpa" IN {
145. type master;
146. file "named.local";
147. allow-update { none; };
148. };
149.
150. zone "0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa" IN {
151. type master;
152. file "named.ip6.local";
153. allow-update { none; };
154. };
155.
156. zone "255.in-addr.arpa" IN {
157. type master;
158. file "named.broadcast";
159. allow-update { none; };
160. };
161.
162. zone "0.in-addr.arpa" IN {
163. type master;
164. file "named.zero";
165. allow-update { none; };
166. };
167.
168. #Add new zone added by Robinson
169. #以下两个zone为新增的，包含正向和反向zone
170. zone "szdb.com" IN {
171. type master;
172. file "node1.szdb.zero";
173. allow-update { none; };
174. };
175.
176. zone "7.168.192.in-addr.arpa" IN {
177. type master;
178. file "7.168.192.local";
179. allow-update { none; };
180. };
181.
182. #配置正向和反向搜索数据库解析文件
183. [root@node1 etc]# pwd
184. /var/named/chroot/etc
185. [root@node1 etc]# cd ../var/named/
186. #同样使用cp -p 方式复制文件到新的正向和反向文件
187. [root@node1 named]# cp -p named.zero node1.szdb.zero
188. [root@node1 named]# cp -p named.local 7.168.192.local
189.
190. #下面是修改之后的正向搜索文件，也可以将host文件的其他ip对照编辑到正向搜索文件以实现解析
191. #如下面的例子将vip的参照关系也添加到解析文件
192. [root@node1 named]# cat node1.szdb.zero
193. $TTL 86400
194. @ IN SOA node1.szdb.com. root.szdb.com. (
195. 42 ; serial (d. adams)
196. 3H ; refresh
197. 15M ; retry
198. 1W ; expiry
199. 1D ) ; minimum
200. IN NS node1.szdb.com.
201. scan-cluster1 IN A 192.168.7.91
202. scan-cluster1 IN A 192.168.7.92
203. scan-cluster1.szdb.com IN A 192.168.7.91
204. scan-cluster1.szdb.com IN A 192.168.7.92
205. node1-vip IN A 192.168.7.81
206. node2-vip IN A 192.168.7.82
207. node1-vip.szdb.com IN A 192.168.7.81
208. node2-vip.szdb.com IN A 192.168.7.82
209.
210. #下面是修改之后的反向搜索文件
211. [root@node1 named]# cat 7.168.192.local
212. $TTL 86400
213. @ IN SOA node1.szdb.com. root.szdb.com. (
214. 1997022700 ; Serial
215. 28800 ; Refresh
216. 14400 ; Retry
217. 3600000 ; Expire
218. 86400 ) ; Minimum
219. IN NS node1.szdb.com.
220. 1 IN PTR node1.szdb.com.
221. 91 IN PTR scan-cluster1.szdb.com.
222. 92 IN PTR scan-cluster1.szdb.com.
223. 91 IN PTR scan-cluster1.
224. 92 IN PTR scan-cluster1.
225. 81 IN PTR node1-vip.
226. 82 IN PTR node2-vip.
227. 81 IN PTR node1-vip.szdb.com.
228. 82 IN PTR node2-vip.szdb.com.
229.
230. #在各个节点配置resolv.conf文件
231. #下面是修改之后的内容
232. [root@node1 named]# more /etc/resolv.conf
233. ; generated by /sbin/dhclient-script
234. #the following item removed by Robinson
235. #search SSG-140
236. #nameserver 192.168.7.10
237. #nameserver 192.168.7.11
238. #the following item added by Robinson
239. search szdb.com
240. nameserver 192.168.7.71
241.
242. #节点2上的resolv.conf文件
243. [root@node2 ~]# more /etc/resolv.conf
244. ; generated by /sbin/dhclient-script
245. #search SSG-140
246. #nameserver 192.168.7.10
247. #nameserver 192.168.7.11
248. search szdb.com
249. nameserver 192.168.7.71
250.
251. #启动dns服务
252. [root@node1 named]# service named restart
253. Stopping named: [ OK ]
254. Starting named: [ OK ]
255. [root@node1 named]# chkconfig named on
256.
257. #测试dns解析
258. [root@node1 named]# cd ~
259. [root@node1 ~]# nslookup 192.168.7.91
260. Server: 192.168.7.71
261. Address: 192.168.7.71#53
262.
263. 91.7.168.192.in-addr.arpa name = scan-cluster1.
264. 91.7.168.192.in-addr.arpa name = scan-cluster1.szdb.com.
265.
266. [root@node1 ~]# nslookup 192.168.7.92
267. Server: 192.168.7.71
268. Address: 192.168.7.71#53
269.
270. 92.7.168.192.in-addr.arpa name = scan-cluster1.szdb.com.
271. 92.7.168.192.in-addr.arpa name = scan-cluster1.
272.
273. [root@node1 ~]# nslookup scan-cluster1
274. Server: 192.168.7.71
275. Address: 192.168.7.71#53
276.
277. Name: scan-cluster1.szdb.com
278. Address: 192.168.7.92
279. Name: scan-cluster1.szdb.com
280. Address: 192.168.7.91
281.
282. [root@node1 ~]# nslookup scan-cluster1.szdb.com.
283. Server: 192.168.7.71
284. Address: 192.168.7.71#53
285.
286. Name: scan-cluster1.szdb.com
287. Address: 192.168.7.91
288. Name: scan-cluster1.szdb.com
289. Address: 192.168.7.92
290. 转：http://blog.csdn.net/leshami/article/details/8291685#comments
1. 1、安装环境
2. #配置DNS，可以使用单独的DNS服务器，也可以直接使用RAC的一个节点来提供DNS解析
3. #直接使用某个节点时，容易出现该节点如果宕机将导致SCAN无法解析，客户端无法连接数据库
4. #本文仅作演示，使用节点1的public ip用作dns，不考虑上面描述的情形以及DNS安全性等。
5. [root@node1 ~]# cat /etc/issue
6. Enterprise Linux Enterprise Linux Server release 5.5 (Carthage)
7. Kernel \r on an \m
8.
9. 2、主机节点host信息
10. [root@node1 ~]# more /etc/hosts
11. # Do not remove the following line, or various programs
12. # that require network functionality will fail.
13. #127.0.0.1 localhost.localdomain localhost
14. #::1 localhost6.localdomain6 localhost6
15.
16. 127.0.0.1 localhost.szdb.com localhost
17. # Public eth0
18. 192.168.7.71 node1.szdb.com node1 #该地址作为DNS服务器地址
19. 192.168.7.72 node2.szdb.com node2
20.
21. #Private eth1
22. 10.10.7.71 node1-priv.szdb.com node1-priv
23. 10.10.7.72 node2-priv.szdb.com node2-priv
24.
25. #Virtual
26. 192.168.7.81 node1-vip.szdb.com node1-vip
27. 192.168.7.82 node2-vip.szdb.com node2-vip
28.
29. #scan
30. 192.168.7.91 scan-cluster1.szdb.com scan-cluster1
31.
32. 3、配置dns需要用到的安装包
33. [root@node1 dns_rpm]# ls -hltr
34. total 1.1M
35. -rw-r--r-- 1 root root 45K Dec 7 18:04 bind-chroot-9.3.6-4.P1.el5_4.2.i386.rpm
36. -rw-r--r-- 1 root root 985K Dec 7 18:04 bind-9.3.6-4.P1.el5_4.2.i386.rpm
37. -rw-r--r-- 1 root root 61K Dec 7 18:04 caching-nameserver-9.3.6-4.P1.el5_4.2.i386.rpm
38.
39. #下面安装rpm包
40. [root@node1 dns_rpm]# rpm -Uvh bind-9.3.6-4.P1.el5_4.2.i386.rpm
41. warning: bind-9.3.6-4.P1.el5_4.2.i386.rpm: Header V3 DSA signature: NOKEY, key ID 1e5e0159
42. Preparing... ########################################### [100%]
43. 1:bind ########################################### [100%]
44. [root@node1 dns_rpm]# rpm -Uvh bind-chroot-9.3.6-4.P1.el5_4.2.i386.rpm
45. warning: bind-chroot-9.3.6-4.P1.el5_4.2.i386.rpm: Header V3 DSA signature: NOKEY, key ID 1e5e0159
46. Preparing... ########################################### [100%]
47. 1:bind-chroot ########################################### [100%]
48. [root@node1 dns_rpm]# rpm -Uvh caching-nameserver-9.3.6-4.P1.el5_4.2.i386.rpm
49. warning: caching-nameserver-9.3.6-4.P1.el5_4.2.i386.rpm: Header V3 DSA signature: NOKEY, key ID 1e5e0159
50. Preparing... ########################################### [100%]
51. 1:caching-nameserver ########################################### [100%]
52.
53. 4、配置DNS
54. #关于DNS的配置，分为以下几个步骤
55. #a.安装所需的rpm包
56. #b.配置named.conf文件
57. #c.配置zone文件，包括正向和反向zone文件
58. #d.配置解析文件resolv.conf
59. #e.启动dns服务
60. [root@node1 ~]# cd /var/named/chroot/etc/
61. #使用下面的方式复制两个新的副本并修改，参数-p表示连同权限及属主，属组一同复制。切记不可忽略参数-p
62. [root@node1 etc]# cp -p named.caching-nameserver.conf named.conf
63. [root@node1 etc]# cp -p named.rfc1912.zones named.zones
64.
65. #修改named.conf文件，将源文件中的所有localhost以及127.0.0.1修改成any，注意any;前后保留空格
66. #该文件主要是配置dns监听那些端口以及ip地址并指明相应的名字解析zone文件名named.zones
67. #下面是修改后的named.conf文件
68. [root@node1 ~]# cat /var/named/chroot/etc/named.conf
69. //
70. // named.caching-nameserver.conf
71. //
72. // Provided by Red Hat caching-nameserver package to configure the
73. // ISC BIND named(8) DNS server as a caching only nameserver
74. // (as a localhost DNS resolver only).
75. //
76. // See /usr/share/doc/bind*/sample/ for example named configuration files.
77. //
78. // DO NOT EDIT THIS FILE - use system-config-bind or an editor
79. // to create named.conf - edits to this file will be lost on
80. // caching-nameserver package upgrade.
81. //
82. options {
83. listen-on port 53 { any; };
84. listen-on-v6 port 53 { ::1; };
85. directory "/var/named";
86. dump-file "/var/named/data/cache_dump.db";
87. statistics-file "/var/named/data/named_stats.txt";
88. memstatistics-file "/var/named/data/named_mem_stats.txt";
89.
90. // Those options should be used carefully because they disable port
91. // randomization
92. // query-source port 53;
93. // query-source-v6 port 53;
94.
95. allow-query { any; };
96. allow-query-cache { any; };
97. };
98. logging {
99. channel default_debug {
100. file "data/named.run";
101. severity dynamic;
102. };
103. };
104. view localhost_resolver {
105. match-clients { any; };
106. match-destinations { any; };
107. recursion yes;
108. include "/etc/named.zones";
109. };
110.
111. #修改named.zones文件，该文件用于指定zone的搜索范围，包括正向和反向。文件末尾最后的两个zone为新增加的
112. #注意每一个zone的file用于指向真正的zone文件，后面要用到
113. # Author : Robinson
114. # Blog : http://blog.csdn.net/robinson_0612
115.
116. #下面是修改后的named.zones文件
117. [root@node1 ~]# cat /var/named/chroot/etc/named.zones
118. // named.rfc1912.zones:
119. //
120. // Provided by Red Hat caching-nameserver package
121. //
122. // ISC BIND named zone configuration for zones recommended by
123. // RFC 1912 section 4.1 : localhost TLDs and address zones
124. //
125. // See /usr/share/doc/bind*/sample/ for example named configuration files.
126. //
127. zone "." IN {
128. type hint;
129. file "named.ca";
130. };
131.
132. zone "localdomain" IN {
133. type master;
134. file "localdomain.zone";
135. allow-update { none; };
136. };
137.
138. zone "localhost" IN {
139. type master;
140. file "localhost.zone";
141. allow-update { none; };
142. };
143.
144. zone "0.0.127.in-addr.arpa" IN {
145. type master;
146. file "named.local";
147. allow-update { none; };
148. };
149.
150. zone "0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa" IN {
151. type master;
152. file "named.ip6.local";
153. allow-update { none; };
154. };
155.
156. zone "255.in-addr.arpa" IN {
157. type master;
158. file "named.broadcast";
159. allow-update { none; };
160. };
161.
162. zone "0.in-addr.arpa" IN {
163. type master;
164. file "named.zero";
165. allow-update { none; };
166. };
167.
168. #Add new zone added by Robinson
169. #以下两个zone为新增的，包含正向和反向zone
170. zone "szdb.com" IN {
171. type master;
172. file "node1.szdb.zero";
173. allow-update { none; };
174. };
175.
176. zone "7.168.192.in-addr.arpa" IN {
177. type master;
178. file "7.168.192.local";
179. allow-update { none; };
180. };
181.
182. #配置正向和反向搜索数据库解析文件
183. [root@node1 etc]# pwd
184. /var/named/chroot/etc
185. [root@node1 etc]# cd ../var/named/
186. #同样使用cp -p 方式复制文件到新的正向和反向文件
187. [root@node1 named]# cp -p named.zero node1.szdb.zero
188. [root@node1 named]# cp -p named.local 7.168.192.local
189.
190. #下面是修改之后的正向搜索文件，也可以将host文件的其他ip对照编辑到正向搜索文件以实现解析
191. #如下面的例子将vip的参照关系也添加到解析文件
192. [root@node1 named]# cat node1.szdb.zero
193. $TTL 86400
194. @ IN SOA node1.szdb.com. root.szdb.com. (
195. 42 ; serial (d. adams)
196. 3H ; refresh
197. 15M ; retry
198. 1W ; expiry
199. 1D ) ; minimum
200. IN NS node1.szdb.com.
201. scan-cluster1 IN A 192.168.7.91
202. scan-cluster1 IN A 192.168.7.92
203. scan-cluster1.szdb.com IN A 192.168.7.91
204. scan-cluster1.szdb.com IN A 192.168.7.92
205. node1-vip IN A 192.168.7.81
206. node2-vip IN A 192.168.7.82
207. node1-vip.szdb.com IN A 192.168.7.81
208. node2-vip.szdb.com IN A 192.168.7.82
209.
210. #下面是修改之后的反向搜索文件
211. [root@node1 named]# cat 7.168.192.local
212. $TTL 86400
213. @ IN SOA node1.szdb.com. root.szdb.com. (
214. 1997022700 ; Serial
215. 28800 ; Refresh
216. 14400 ; Retry
217. 3600000 ; Expire
218. 86400 ) ; Minimum
219. IN NS node1.szdb.com.
220. 1 IN PTR node1.szdb.com.
221. 91 IN PTR scan-cluster1.szdb.com.
222. 92 IN PTR scan-cluster1.szdb.com.
223. 91 IN PTR scan-cluster1.
224. 92 IN PTR scan-cluster1.
225. 81 IN PTR node1-vip.
226. 82 IN PTR node2-vip.
227. 81 IN PTR node1-vip.szdb.com.
228. 82 IN PTR node2-vip.szdb.com.
229.
230. #在各个节点配置resolv.conf文件
231. #下面是修改之后的内容
232. [root@node1 named]# more /etc/resolv.conf
233. ; generated by /sbin/dhclient-script
234. #the following item removed by Robinson
235. #search SSG-140
236. #nameserver 192.168.7.10
237. #nameserver 192.168.7.11
238. #the following item added by Robinson
239. search szdb.com
240. nameserver 192.168.7.71
241.
242. #节点2上的resolv.conf文件
243. [root@node2 ~]# more /etc/resolv.conf
244. ; generated by /sbin/dhclient-script
245. #search SSG-140
246. #nameserver 192.168.7.10
247. #nameserver 192.168.7.11
248. search szdb.com
249. nameserver 192.168.7.71
250.
251. #启动dns服务
252. [root@node1 named]# service named restart
253. Stopping named: [ OK ]
254. Starting named: [ OK ]
255. [root@node1 named]# chkconfig named on
256.
257. #测试dns解析
258. [root@node1 named]# cd ~
259. [root@node1 ~]# nslookup 192.168.7.91
260. Server: 192.168.7.71
261. Address: 192.168.7.71#53
262.
263. 91.7.168.192.in-addr.arpa name = scan-cluster1.
264. 91.7.168.192.in-addr.arpa name = scan-cluster1.szdb.com.
265.
266. [root@node1 ~]# nslookup 192.168.7.92
267. Server: 192.168.7.71
268. Address: 192.168.7.71#53
269.
270. 92.7.168.192.in-addr.arpa name = scan-cluster1.szdb.com.
271. 92.7.168.192.in-addr.arpa name = scan-cluster1.
272.
273. [root@node1 ~]# nslookup scan-cluster1
274. Server: 192.168.7.71
275. Address: 192.168.7.71#53
276.
277. Name: scan-cluster1.szdb.com
278. Address: 192.168.7.92
279. Name: scan-cluster1.szdb.com
280. Address: 192.168.7.91
281.
282. [root@node1 ~]# nslookup scan-cluster1.szdb.com.
283. Server: 192.168.7.71
284. Address: 192.168.7.71#53
285.
286. Name: scan-cluster1.szdb.com
287. Address: 192.168.7.91
288. Name: scan-cluster1.szdb.com
289. Address: 192.168.7.92
290. 转：http://blog.csdn.net/leshami/article/details/8291685#comments
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/31448824/viewspace-2139480/ ，如需转载，请注明出处，否则将追究法律责任。
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