Nagios监控mongodb分片集群服务实战
1，监控插件下载
Mongodb插件下载地址为：git clone git://github.com/mzupan/nagios-plugin-mongodb.git，刚開始本人这里没有安装gitpub环境，找网友草根帮忙下载的。之后上传到了csdn资源页面，新的下载地址为：http://download.csdn.net/detail/mchdba/8019077
由于mongodb服务是和mysql从库公用一台物理机。之前已经做了基础nagios以及mysql服务监控，所以这里仅仅须要在原来的基础上加入mongodb命令和服务就可以。Nagios监控mysql请參考：http://blog.itpub.net/26230597/viewspace-760141/以及http://blog.itpub.net/26230597/viewspace-1217246/。所以这里须要加入的mongodb监控命令例如以下所看到的：
[root@wgq objects]# cd /usr/local/nagios/etc/objects[root@wgq objects]# vim commands.cfgdefine command { command_name check_mongodb command_line $USER1$/nagios-plugin-mongodb/check_mongodb.py -H $HOSTADDRESS$ -A $ARG1$ -P $ARG2$ -W $ARG3$ -C $ARG4$}define command { command_name check_mongodb_database command_line $USER1$/nagios-plugin-mongodb/check_mongodb.py -H $HOSTADDRESS$ -A $ARG1$ -P $ARG2$ -W $ARG3$ -C $ARG4$ -d $ARG5$}define command { command_name check_mongodb_collection command_line $USER1$/nagios-plugin-mongodb/check_mongodb.py -H $HOSTADDRESS$ -A $ARG1$ -P $ARG2$ -W $ARG3$ -C $ARG4$ -d $ARG5$ -c $ARG6$}define command { command_name check_mongodb_replicaset command_line $USER1$/nagios-plugin-mongodb/check_mongodb.py -H $HOSTADDRESS$ -A $ARG1$ -P $ARG2$ -W $ARG3$ -C $ARG4$ -r $ARG5$}define command { command_name check_mongodb_query command_line $USER1$/nagios-plugin-mongodb/check_mongodb.py -H $HOSTADDRESS$ -A $ARG1$ -P $ARG2$ -W $ARG3$ -C $ARG4$ -q $ARG5$}3，加入mongodb监控服务mongodb的服务也须要单独又一次加入。例如以下所看到的：
#检測mongodb服务的连接时间，超过2秒就普通报警，5秒就严重报警define service{ host_name dbm1slave1 service_description Mongo Connect Check check_command check_mongodb!connect!30000!2!5 max_check_attempts 5 normal_check_interval 3 retry_check_interval 2 check_period 24x7 notification_interval 10 notification_period 24x7 notification_options w,u,c,r contact_groups ops }#检查mongodb的连接数，超过150普通报警，200严重报警define service{ host_name dbm1slave1 service_description Mongo Free Connections check_command check_mongodb!connections!27017!70!80 max_check_attempts 5 normal_check_interval 3 retry_check_interval 2 check_period 24x7 notification_interval 10 notification_period 24x7 notification_options w,u,c,r contact_groups ops } #检查mongodb复制完毕的百分比率，确保primary和standby的time是一致的。define service{ host_name dbm1slave1 service_description Mongo Replication Lag check_command check_mongodb!replication_lag!27017!15!30 max_check_attempts 5 normal_check_interval 3 retry_check_interval 2 check_period 24x7 notification_interval 10 notification_period 24x7 notification_options w,u,c,r contact_groups ops } #检查mongodb内存使用率。阀值与mongodb所在机器的总内存数相关define service{ host_name dbm1slave1 service_description Mongo Memory Usage check_command check_mongodb!memory!27017!20!28 max_check_attempts 5 normal_check_interval 3 retry_check_interval 2 check_period 24x7 notification_interval 10 notification_period 24x7 notification_options w,u,c,r contact_groups ops } #检查mongodb Mapped的内存使用率。阀值与mongodb所在机器的总内存数相关define service{ host_name dbm1slave1 service_description Mongo Mapped Memory Usage check_command check_mongodb!memory_mapped!27017!20!28 max_check_attempts 5 normal_check_interval 3 retry_check_interval 2 check_period 24x7 notification_interval 10 notification_period 24x7 notification_options w,u,c,r contact_groups ops } #检查Lock Time的百分率。假设lock time占领mongo运行时间的5%就普通报警。假设超过10%就严重报警define service{ host_name dbm1slave1 service_description Mongo Lock Percentage check_command check_mongodb!lock!27017!5!10 max_check_attempts 5 normal_check_interval 3 retry_check_interval 2 check_period 24x7 notification_interval 10 notification_period 24x7 notification_options w,u,c,r contact_groups ops }# Check Average Flush Time，检查mongo服务器的平均flush时间，define service{ host_name dbm1slave1 service_description Mongo Flush Average check_command check_mongodb!flushing!27017!100!200 max_check_attempts 5 normal_check_interval 3 retry_check_interval 2 check_period 24x7 notification_interval 10 notification_period 24x7 notification_options w,u,c,r contact_groups ops }# Check Last Flush Time，检查最新的flush时间，假设超过200ms就普通报警。超过400ms就严重报警define service{ host_name dbm1slave1 service_description Mongo Last Flush Time check_command check_mongodb!last_flush_time!27017!200!400 max_check_attempts 5 normal_check_interval 3 retry_check_interval 2 check_period 24x7 notification_interval 10 notification_period 24x7 notification_options w,u,c,r contact_groups ops } # Check status of mongodb replicaset，检查mongo复制的状态define service{ host_name dbm1slave1 service_description MongoDB state check_command check_mongodb!replset_state!27017!0!0 max_check_attempts 5 normal_check_interval 3 retry_check_interval 2 check_period 24x7 notification_interval 10 notification_period 24x7 notification_options w,u,c,r contact_groups ops }# Check status of index miss ratio，检查索引命中率。define service{ host_name dbm1slave1 service_description MongoDB Index Miss Ratio check_command check_mongodb!index_miss_ratio!27017!.005!.01 max_check_attempts 5 normal_check_interval 3 retry_check_interval 2 check_period 24x7 notification_interval 10 notification_period 24x7 notification_options w,u,c,r contact_groups ops } # Check number of databases and number of collectionsdefine service{ host_name dbm1slave1 service_description MongoDB Number of databases check_command check_mongodb!databases!27017!300!500 max_check_attempts 5 normal_check_interval 3 retry_check_interval 2 check_period 24x7 notification_interval 10 notification_period 24x7 notification_options w,u,c,r contact_groups ops }define service{ host_name dbm1slave1 service_description MongoDB Number of collections check_command check_mongodb!collections!27017!300!500 max_check_attempts 5 normal_check_interval 3 retry_check_interval 2 check_period 24x7 notification_interval 10 notification_period 24x7 notification_options w,u,c,r contact_groups ops } # Check size of a database，检查库的大小define service{ host_name dbm1slave1 service_description MongoDB Database size your-database check_command check_mongodb_database!database_size!27017!300!500!your-database max_check_attempts 5 normal_check_interval 3 retry_check_interval 2 check_period 24x7 notification_interval 10 notification_period 24x7 notification_options w,u,c,r contact_groups ops } # Check index size of a database，检查库索引的大小define service{ host_name dbm1slave1 service_description MongoDB Database index size your-database check_command check_mongodb_database!database_indexes!27017!50!100!your-database max_check_attempts 5 normal_check_interval 3 retry_check_interval 2 check_period 24x7 notification_interval 10 notification_period 24x7 notification_options w,u,c,r contact_groups ops } # Check index size of a collection，检查集合collection的索引大小define service{ host_name dbm1slave1 service_description MongoDB Database index size your-database check_command check_mongodb_collection!collection_indexes!27017!50!100!your-database!your-collection max_check_attempts 5 normal_check_interval 3 retry_check_interval 2 check_period 24x7 notification_interval 10 notification_period 24x7 notification_options w,u,c,r contact_groups ops } # Check the primary server of replicaset。检查复制的primary服务define service{ host_name dbm1slave1 service_description MongoDB Replicaset Master Monitor: your-replicaset check_command check_mongodb_replicaset!replica_primary!27017!0!1!your-replicaset #演示样例：check_command check_mongodb_replicaset!replica_primary!27017!0!1!shard2 max_check_attempts 5 normal_check_interval 3 retry_check_interval 2 check_period 24x7 notification_interval 10 notification_period 24x7 notification_options w,u,c,r contact_groups ops } # Check the number of queries per second，检查每一秒的查询数量define service{ host_name dbm1slave1 service_description MongoDB Updates per Second check_command check_mongodb_query!queries_per_second!27017!200!150!update max_check_attempts 5 normal_check_interval 3 retry_check_interval 2 check_period 24x7 notification_interval 10 notification_period 24x7 notification_options w,u,c,r contact_groups ops } # Check Primary Connection，检查复制中与primary库的连接时间，超过2秒就普通报警，超过4秒就严重报警define service{ host_name dbm1slave1 service_description Mongo Connect Check check_command check_mongodb!connect_primary!27017!2!4 max_check_attempts 5 normal_check_interval 3 retry_check_interval 2 check_period 24x7 notification_interval 10 notification_period 24x7 notification_options w,u,c,r contact_groups ops }# Check Collection State。检查collection状态，检查mongo服务组列表的每个主机，能够检查重要collection的高可用性（锁、超时、服务配置的可用性）。假设发现一个查询失败就会报警。define service{ host_name dbm1slave1 service_description Mongo Collection State check_command check_mongodb!collection_state!27017!your-database!your-collection max_check_attempts 5 normal_check_interval 3 retry_check_interval 2 check_period 24x7 notification_interval 10 notification_period 24x7 notification_options w,u,c,r contact_groups ops }4，查看部分监控项效果
配置完nagios端服务。重新启动下service nagios restart; 等上几分钟，nagios监控界面就会出现完整的mongo服务信息，例如以下所看到的：
5，从ps中确定mongodb的架构
[root@db-m1-slave-1 ~]# ps -eaf|grep mongo
mongodb 2457 1 0 2013 ?
2-03:39:08 ./mongod --configsvr --dbpath /home/data/mongodb/config --port 20000 --logpath /home/data/mongodb/config.log --logappend --fork
mongodb 2804 1 0 2013 ? 1-10:02:33 mongos --configdb 192.168.12.62:20000,192.168.12.63:20000,192.168.12.72:20000 --port 30000 --chunkSize 64 --logpath /home/data/mongodb/mongos.log --logappend --fork
mongodb 3072 1 0 2013 ?
1-10:17:20 mongod --shardsvr --replSet shard1 --port 27017 --dbpath /home/data/mongodb/shard11 --oplogSize 2048 --logpath /home/data/mongodb/shard11.log --logappend --fork
root 11179 9391 0 11:14 pts/1 00:00:00 grep mongo
mongodb 30414 1 0 Feb14 ? 1-06:20:50 mongod --shardsvr --replSet shard2 --port 27018 --dbpath /home/data/mongodb/shard21 --oplogSize 2048 --logpath /home/data/mongodb/shard21.log --logappend --fork
[root@db-m1-slave-1 ~]#
看到有4个mongo进程，
a) 启动參数有“--configdb”的就是集群入口进程；
b) Shard Server，启动參数带“--shardsvr --replSet”的是集群分片的一个片组启动进程，用户存储实际的数据块，也就是27017port和27018port的mongodb服务实例。至于怎样推断27017port中哪个是primary哪个是secondary须要去登录27107port运行rs.status();去查看一下。
c) Config Server：启动參数带“--configsvr”的进程，存储了整个Cluster Metadata，当中包含chunk信息，也就是20000port的mongodb服务实例。
d) Route Server：启动參数带“mongos --configdb”的进程，前端路由，client由此接入。且让整个集群看上去像单一数据库，前端应用能够透明使用。也就是30000port的mongodb实例。
6，调试中出现过的错误
错误1：
[root@wgq nagios ~]# tail -f /usr/local/nagios/var/nagios.log
[1412819956] Warning: Return code of 13 for check of service 'Mongo Memory Usage' on host 'dbm1slave1' was out of bounds.
[1412819956] SERVICE ALERT: dbm1slave1;Mongo Memory Usage;CRITICAL;SOFT;1;(Return code of 13 is out of bounds)
[1412819975] Warning: Return code of 13 for check of service 'Mongodb Connect Check' on host 'dbm1slave1' was out of bounds.
[1412819975] SERVICE ALERT: dbm1slave1;Mongodb Connect Check;CRITICAL;SOFT;1;(Return code of 13 is out of bounds)
[1412820058] Warning: Return code of 13 for check of service 'Mongo Free Connections' on host 'dbm1slave1' was out of bounds.
须要赋值nagios用户全部权限以及r运行权限
chmod 770 /usr/lib/nagios/plugins/check_mongodb.py
chown -R nagios.nagios /usr/lib/nagios/plugins/check_mongodb.py
错误2：
监控界面Status Information一栏出现 No module named pymongo报错提示信息：
出现这个提示是由于须要安装pymongo模块，运行easy_install pymongo命令安装就可以。例如以下所看到的：
[root@wgq objects]# easy_install pymongo
Searching for pymongo
Reading http://pypi.python.org/simple/pymongo/
Best match: pymongo 2.7.2
......
zip_safe flag not set; analyzing archive contents...
Adding pymongo 2.7.2 to easy-install.pth file
Installed /usr/lib/python2.6/site-packages/pymongo-2.7.2-py2.6-linux-x86_64.egg
Processing dependencies for pymongo
Finished processing dependencies for pymongo
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原博客地址：http://blog.itpub.net/26230597/viewspace-1293589/
原作者：黄杉 (mchdba)
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參考文章：https://github.com/mzupan/nagios-plugin-mongodb/blob/master/README.md
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