AWS Centos磁盘和内存监控脚本
在centos上使用AWS官方的硬盘和内存监控脚本，会发现脚本出错，无法正常工作，这是因为aws的官方文档中提到该脚本没有在centos上做过测试，并不能保证脚本能正常使用 那么该如何解决呢，需要安装以下软件：yum install -y perl-CPAN
exportPERL_MM_USE_DEFAULT=1
# setup defaultconfig
perl -MCPAN -e shell #进入MCPAN Shell，自动生成默认配置，并退出
# 类似于yum,下载安装各种包，需要花点时间
perl -MCPAN -e'CPAN::Shell->rematein("notest", "install","Bundle::CPAN")'
perl -MCPAN -e'CPAN::Shell->rematein("notest", "install","CPAN")'
perl -MCPAN -e'CPAN::Shell->rematein("notest", "install","Bundle::LWP")'
perl -MCPAN -e 'CPAN::Shell->rematein("notest","install", "LWP")'
perl -MCPAN -e'CPAN::Shell->rematein("notest", "install","LWP::Protocol::https")'
perl -MCPAN -e'CPAN::Shell->rematein("notest", "install","Crypt::SSLeay")'
perl -MCPAN -e'CPAN::Shell->rematein("notest", "install","Switch")'安装完成后，可能仍然会出现问题：
Can't locate object method "new" via package "LWP::Protocol::https::Socket"需要再次安装：
cpan>
install Net::HTTPS
install Net::SSL
install IO::Socket::SSL但是仍然报错：
# perl mon-put-instance-data.pl--mem-util
ERROR: Failed tocall CloudWatch: HTTP 500. Message: Can't connect to monitoring.us-east-1.amazonaws.com:443
(Crypt-SSLeay can't verify hostnames) Net::SSL fromCrypt-SSLeay can't verify hostnames;
either install IO::Socket::SSL or turn offverification by setting the PERL_LWP_SSL_VERIFY_HOSTNAME
environment variableto 0 at /usr/local/share/perl5/LWP/Protocol/http.pm line 46.提示IO::Socket::SSL没安装，但确实是安装了；不过，根据错误提示可以设置环境变量得以解决
# export PERL_LWP_SSL_VERIFY_HOSTNAME=0
# perl mon-put-instance-data.pl --mem-util
Successfullyreported metrics to CloudWatch. Reference Id:cab2a044-1515-11e7-9631-9fb8068ec2cc再次执行就成功了；但是，注意监控脚本一般是放在crontab中执行的，因此crontab中还需要加入环境变量
*/5 * * * * export PERL_LWP_SSL_VERIFY_HOSTNAME=0 && perl /opt/alarm/aws-scripts-mon/mon-put-instance-data.pl --mem-util--mem-avail --mem-used --swap-used --swap-util
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