解决不能启动httpd的mod_jk2.so: undefined symbol: apr_pool_get_parent问题
解决不能启动httpd的mod_jk2.so: undefined symbol: apr_pool_get_parent问题在配置JSP环境中，安装tomcat后启动httpd出现
启动 httpd：httpd: Syntax error on line 210 of /etc/httpd/conf/httpd.conf: Syntax error on line 5 of /etc/httpd/conf.d/jk2.conf: Cannot load /etc/httpd/modules/mod_jk2.so into server: /etc/httpd/modules/mod_jk2.so: undefined symbol: apr_pool_get_parent
[失败]
这是因为mod_jk2.so与当前的httpd不兼容，所以需要手工编译mod_jk2.so模块。
工手编译mod_jk2模块
到http://archive.apache.org/dist/tomcat/tomcat-connectors/jk2/source/下载新版本的mod_jk2.so源代码。
wget http://archive.apache.org/dist/tomcat/tomcat-connectors/jk2/source/jakarta-tomcat-connectors-jk2-2.0.4-src.tar.gz
$ tar xzvf jakarta-tomcat-connectors-jk2-2.0.4-src.tar.gz
$ cd jakarta-tomcat-connectors-jk2-2.0.4-src
$ cd jk/native2/
# ls /usr/sbin/apxs
/usr/sbin/apxs （如果没有apxs需要安装httpd-devel）
#./configure --with-apxs2=/usr/sbin/apxs
$ make
$ cd ../build/jk2/apache2/
$ sudo cp mod_jk2.so /usr/lib/httpd/modules/
# service httpd start
启动 httpd： [确定]
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