mongostat是mongoDB自带的工具，用于检测mongodb的运行状态。

mongostat用法

Test:Test/node-131 / # mongostat --help
Usage:
  mongostat <options> <polling interval in seconds>

Monitor basic MongoDB server statistics.

See http://docs.mongodb.org/manual/reference/program/mongostat/ for more information.

general options:
      --help                                      print usage
      --version                                   print the tool version and exit

verbosity options:
  -v, --verbose=<level>                           more detailed log output (include multiple times for more verbosity, e.g. -vvvvv, or specify a numeric value, e.g. --verbose=N)
      --quiet                                     hide all log output

connection options:
  -h, --host=<hostname>                           mongodb host to connect to (setname/host1,host2 for replica sets)
      --port=<port>                               server port (can also use --host hostname:port)

ssl options:
      --ssl                                       connect to a mongod or mongos that has ssl enabled
      --sslCAFile=<filename>                      the .pem file containing the root certificate chain from the certificate authority
      --sslPEMKeyFile=<filename>                  the .pem file containing the certificate and key
      --sslPEMKeyPassword=<password>              the password to decrypt the sslPEMKeyFile, if necessary
      --sslCRLFile=<filename>                     the .pem file containing the certificate revocation list
      --sslAllowInvalidCertificates               bypass the validation for server certificates
      --sslAllowInvalidHostnames                  bypass the validation for server name
      --sslFIPSMode                               use FIPS mode of the installed openssl library

authentication options:
  -u, --username=<username>                       username for authentication
  -p, --password=<password>                       password for authentication
      --authenticationDatabase=<database-name>    database that holds the users credentials
      --authenticationMechanism=<mechanism>       authentication mechanism to use

stat options:
      --noheaders                                 dont output column names
  -n, --rowcount=<count>                          number of stats lines to print (0 for indefinite)
      --discover                                  discover nodes and display stats for all
      --http                                      use HTTP instead of raw db connection
      --all                                       all optional fields
      --json                                      output as JSON rather than a formatted table

举例：

• 20秒数据，每1秒钟输出

mongostat -h 80.81.2.3 -p 27017 --rowcount 20 1

• 300秒数据，每5秒输出

mongostat -h 80.81.2.3 -p 27017 -n 300 5

• 以json格式输出

mongostat -h 80.81.2.4 -p 27017 -n 60 1 --json

• 搜集复制集aCloud中所有节点的60s内运行状态，间隔1s刷新，保存到文件mongostat_aCloud.log中。

mongostat -h aCloud/80.81.2.4,80.81.2.5,80.81.2.6 -p 27017 -n 60 1 >> mongostat_aCloud.log

# 监控复制集Primary节点 80.81.2.4 的状态
Sangfor:aCloud/node-131 /var/lib/mongodb # mongostat -h 80.81.2.4 -p 27017 -n 60 1
insert query update delete getmore command % dirty % used flushes vsize    res qr|qw ar|aw netIn netOut conn    set repl                      time
  4327    *0     *0     *0     445   748|0     0.5    4.1       0  1.1G 437.0M   0|0   0|0  834k     1m    7 aCloud  PRI 2016-07-21T20:56:48+08:00
  3857    *0     *0     *0     442   752|0     0.5    4.1       0  1.1G 438.0M   0|0   0|0  771k     1m    7 aCloud  PRI 2016-07-21T20:56:49+08:00

结果解析：

• insert 每秒instert操作次数
• query 每秒query操作次数
• update 每秒update操作次数
• delete 每秒delete操作次数
• getmore每秒getmore操作次数
• command每秒command执行次数
• flushes每秒执行fsync将数据写入硬盘的次数
• vsize 虚拟内存使用量，单位是MB
• res 物理内存使用量，单位MB
• qr|qw 队列中waiting的读/写次数
• ar|aw 已激活active的读/写次数
• netIn 接收端网络速率，单位是bytes
• netOut发送端网络速率，单位是bytes
• conn 连接数(open connections)
• set 复制集(replica set)名称
• repl 成员在复制集中的状态(PRI|SEC|ARB|REC)

测试关注：
netIn、netOut、conn