percona_template_for_cacti监控图像增加对redis多实例监控的支持
percona的cacti模板还是挺帅气的，但是对于redis、memercache等多实例而言，只能监控默认6379，或者一个其他端口（总之不能监控所有实例），这还是很可惜的，要实现监控一切可以监控的对象，就必须自定义模板，经过了半天的摸索，终于实现了，先来看一下帅气的截图：步骤：
1、下载percona模板，解压，因之前用的时1.0.1版本的，所以还是在原版本的基础上修改
wget http://www.percona.com/redir/downloads/percona-monitoring-plugins/1.0.1/percona-monitoring-plugins-1.0.1.tar.gz
2、在redis的默认模板配置文件的基础上增加选项port2，用户在新建redis监控图像时要求填写redis端口号，不填的话就是默认的6379，ss_get_by_ssh.php脚本通过port2选项连接指定端口的redis实例：
cd percona-monitoring-plugins-1.0.1/cacti/bin
➜bin./pmp-cacti-template \
> --script ../scripts/ss_get_by_ssh.php ../definitions/redis.def \
> --mpds port2 >../templates/cacti_host_template_percona_redis_server_ht_for_multi_instance.xml
创建模板脚本的使用说明
➜bin./pmp-cacti-template --help
pmp-cacti-template generates a Cacti template from a definition file.For more
details, please use the --help option, or try 'perldoc pmp-cacti-template' for
complete documentation.
Usage: pmp-cacti-template <options> FILE
Options:
--cactiver Create templates for this Cacti version
--graph_height Height of generated graphs (default 120)
--graph_width Width of generated graphs (default 500)
--help Show this help message
--lint_check Complain about unused data found in the script
--mpds Comma-separated list of input method options to make
per-data-source
--name_prefix Template name prefix (default Percona)
--poll_intervalPolling interval (default 300)
--script Command-line script to use (required)
--smallint Create templates for 32-bit MySQL
--version Output version information and exit
Options and values after processing arguments:
--cactiver (No value)
--graph_height 120
--graph_width 500
--help TRUE
--lint_check FALSE
--mpds
--name_prefix Percona
--poll_interval300
--script (No value)
--smallint FALSE
--version FALSE
➜bin
3、在cacti的web管理页面导入新创建的redis模板cacti_host_template_percona_redis_server_ht_for_multi_instance.xml
console->Import/Export->Import Templates->choose file->import
4、修改redis模板中图像的title，以便区分图像属于那个实例,本例使用用户在创建图像时输入的端口号区分，在cacti中变量使用||引用
console->Templates->Graph Templates->search 'redis' and select a redis template->in Graph Template title->|host_description| - Redis Commands - |input_port2|->save
5、新建redis的监控图像，记得填写端口号
6、如果在导入新模板之前已经有对redis 6379的监控，这时图像显示名字会不正常，如192.168.0.19_Redis19- Redis Unsaved Changes - |input_port2|,而非192.168.0.19_Redis19- Redis Unsaved Changes - 6382
需要修改之前的datasource
console->Create->Data Sources->search 'redis' and select a data source->in the Custom Data,let port2=6379->save
7、脚本刷新图像显示名字
在cacti服务器的脚本目录下：
# pwd
/var/www/cacti/cacti/cli
# php -q poller_graphs_reapply_names.php-id=All -d -s=Redis
WARNING: Do not interrupt this script.Interrupting during rename can cause issues
DEBUG: There are '142' Graphs to rename
DEBUG: Graph Name '192.168.0.19_Redis19 - Redis Commands - 6379' starting
DEBUG: Graph Rename Done for Graph '192.168.0.19_Redis19 - Redis Commands - 6379'
DEBUG: Graph Name '192.168.0.19_Redis19 - Redis Connections - 6379' starting
DEBUG: Graph Rename Done for Graph '192.168.0.19_Redis19 - Redis Connections - 6379'
DEBUG: Graph Name '192.168.0.19_Redis19 - Redis Memory - 6379' starting
DEBUG: Graph Rename Done for Graph '192.168.0.19_Redis19 - Redis Memory - 6379'
8、ok，刷新web图像就显示正常，见本文开头截图。
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