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《Perl语言入门》——读书笔记

Perl语言入门 /** * prism.js Github theme based on GitHub's theme. * @author Sam Clarke */ code[class*="language-"], pre[class*="language-"] { color: #333; background: none; font-family: Consolas, "Liberation Mono", Menlo, Courier, monospace; text-align: left; white-space: pre; word-spacing: normal; word-break: normal; word-wrap: normal; line-height: 1.4; -moz-tab-size: 8; -o-tab-size: 8; tab-size: 8; -webkit-hyphens: none; -moz-hyphens: none; -ms-hyphens: none; hyphens: none; } /* Code blocks */ pre[class*="language-"] { padding: .8em; overflow: auto; /* border: 1px solid #ddd; */ border-radius: 3px; /* background: #fff; */ background: #f5f5f5; } /* Inline code */ :not(pre) > code[class*="language-"] { padding: .1em; border-radius: .3em; white-space: normal; background: #f5f5f5; } .token.comment, .token.blockquote { color: #969896; } .token.cdata { color: #183691; } .token.doctype, .token.punctuation, .token.variable, .token.macro.property { color: #333; } .token.operator, .token.important, .token.keyword, .token.rule, .token.builtin { color: #a71d5d; } .token.string, .token.url, .token.regex, .token.attr-value { color: #183691; } .token.property, .token.number, .token.boolean, .token.entity, .token.atrule, .token.constant, .token.symbol, .token.command, .token.code { color: #0086b3; } .token.tag, .token.selector, .token.prolog { color: #63a35c; } .token.function, .token.namespace, .token.pseudo-element, .token.class, .token.class-name, .token.pseudo-class, .token.id, .token.url-reference .token.variable, .token.attr-name { color: #795da3; } .token.entity { cursor: help; } .token.title, .token.title .token.punctuation { font-weight: bold; color: #1d3e81; } .token.list { color: #ed6a43; } .token.inserted { background-color: #eaffea; color: #55a532; } .token.deleted { background-color: #ffecec; color: #bd2c00; } .token.bold { font-weight: bold; } .token.italic { font-style: italic; } /* JSON */ .lan

02

install_driver(mysql) failed

安装好了mysql监控神器innotop,正得意,innotoop不可用,其错误提示为install_driver(mysql) failed: Can't load '/usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi/auto/DBD/mysql/mysql.so' for module DBD::mysql: libmysqlclient.so.15: cannot open shared object  file:...经查原有又是DBD惹的祸,这个问题已经发生过好几次了。 1、故障现象 [root@dbsrv1 ~]# cat /etc/issue CentOS release 5.11 (Final) Kernel \r on an \m [root@dbsrv1 ~]# innotop localhost PROCESSLIST_NO_IS: install_driver(mysql) failed: Can't load '/usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi/auto/DBD/mysql/mysql.so' for module DBD::mysql: libmysqlclient.so.15: cannot open shared object file: No such file or directory at /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi/DynaLoader.pm line 230. at (eval 504) line 3 Compilation failed in require at (eval 504) line 3. Perhaps a required shared library or dll isn't installed where expected  at /usr/bin/innotop line 7601 2、安装perl-DBD-MySQL [root@dbsrv1 ~]# yum install perl-DBD-MySQL Loaded plugins: fastestmirror, security Repository base is listed more than once in the configuration Repository updates is listed more than once in the configuration Repository extras is listed more than once in the configuration Repository centosplus is listed more than once in the configuration Repository contrib is listed more than once in the configuration Loading mirror speeds from cached hostfile  * base: mirrors.163.com  * epel: mirrors.ustc.edu.cn  * extras: mirrors.skyshe.cn  * updates: mirrors.pubyun.com Setting up Install Process Package perl-DBD-MySQL-3.0007-2.el5.x86_64 already installed and latest version Nothing to do ###上面描述已经perl-DBD-MySQL已经安装,且为最新的版本 [root@dbsrv1 yum.repos.d]# rpm -qa |grep -i dbd perl-DBD-MySQL-3.0007-2.el5 ###首先先卸载perl-DBD-MySQL,然后再次使用yum安装 [root@dbsrv1 yum.repos.d]# rpm -e --nodeps perl-DBD-MySQL-3.0007-2.el5 [root@dbsrv1 yum.repos.d]# rpm -qa |grep -i dbd [root@dbsrv1 yum.repos.d]# yum install perl-DBD-MySQL Loaded plugins: fastestmirror, security Repository base is listed more than once in the configuration Reposit

03

安装MHA中清理Relay log报错

[root@MHA3 ~]#  /usr/bin/purge_relay_logs --user=root --password=123456 -disable_relay_log_purge --port=3306 --workdir=/opt/mysql/data/ 2014-08-27 09:19:30: purge_relay_logs script started. install_driver(mysql) failed: Can't locate DBD/mysql.pm in @INC (@INC contains: /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/site_perl/5.8.8 /usr/lib/perl5/site_perl /usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/5.8.8 .) at (eval 6) line 3. Perhaps the DBD::mysql perl module hasn't been fully installed, or perhaps the capitalisation of 'mysql' isn't right. Available drivers: DBM, ExampleP, File, Gofer, Proxy, Sponge.  at /usr/bin/purge_relay_logs line 162

01

CentOS-6.4-minimal版中源码安装Apache-2.2.29

CentOS-6.4-minimal版中源码安装Apache-2.2.29 ---------------------------------------------------------------------------------------------------------------------- 源码安装软件时常见的三个步骤 1)配置环境:通常命令为./configure --prefix=DIR(即指定软件安装目录),如果还想启用其它功能,可在后面接着添加指令           比如下面的--enable-ssl用于启用Apache的SSL模块           若不想使用操作系统缺省的SSL库,还可通过--with-ssl=DIR指定自己编译的SSL库 2)编译源码:通常命令为make 3)安装应用:通常命令为make install ---------------------------------------------------------------------------------------------------------------------- 注意事项 1)httpd-2.2.29目录下的configure工具是GNU软件基金会推出的专门用于源码发布的工具 2)配置环境时若出现这个错误[configure: error: no acceptable C compiler found in $PATH],是说明缺少GCC编译环境   这时执行[yum -y install gcc]命令安装编译源码所需的工具和库就可以了 3)执行yum命令时若出现这个错误[Error: database disk image is malformed],是说明yum的缓存出错,需要清理缓存   这时执行[yum clean dbcache]命令即可 4)配置环境时configure的主要工作就是生成Makefile,编译源码时的make命令就是根据Makefile来进行编译的 5)最好以root安装和启动Apache,以root运行之后,apache就会把它的派生进程切换到非root用户 ---------------------------------------------------------------------------------------------------------------------- 安装Perl5 [root@CentOS64 software]# yum -y install wget [root@CentOS64 software]# wget http://www.cpan.org/src/5.0/perl-5.20.1.tar.gz [root@CentOS64 software]# tar zxvf perl-5.20.1.tar.gz [root@CentOS64 software]# cd perl-5.20.1 [root@CentOS64 perl-5.20.1]# ./Configure -des -Dprefix=/app/perl [root@CentOS64 perl-5.20.1]# make [root@CentOS64 perl-5.20.1]# make install [root@CentOS64 perl-5.20.1]# perl -v ---------------------------------------------------------------------------------------------------------------------- 安装OpenSSL [root@CentOS64 software]# tar zxvf openssl-1.0.1i.tar.gz [root@CentOS64 software]# cd openssl-1.0.1i [root@CentOS64 openssl-1.0.1i]# ./config --prefix=/app/openssl [root@CentOS64 openssl-1.0.1i]# make [root@CentOS64 openssl-1.0.1i]# make install [root@CentOS64 openssl-1.0.1i]# /app/openssl/bin/openssl version ---------------------------------------------------------------------------------------------------------------------- 安装Apache [root@CentOS64 software]# tar z

01
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