This article is about mongostat to monitor MongoDB health and its stat. mongostat in MongoDB a performance monitoring tool. mongostat is built-in MongoDB monitoring tools.
1. Overview of mongostat to monitor MongoDB
mongostat in MongodB being used to monitor mongoDB database server, its a built-in tool for measuring performance of your MongoDB database, which provides overall stats of mongodb database server.
mongostat is basically used to monitor mongodb database which provides stats of database server as: number of operations ( i.e. insert/read/update/delete ) serving by mongodb server, You can view insight or overview of stats to measure health or performance of MongoDB. How can you know, what is going on inside of mongodb engine. mongostat in MongoDB gives us the following insight:
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mongostatgive us per second overview of lot of things. - how much query for insert, read, update , delete , getMore are serving by mongodb engine per second.
- how much operations mongo engine serve per second i.e read, write , delete, update
- how much connections are active on this server per second.
- how much number of netIn and netOut no of bytes for incoming and outgoing for this server per second.
- no of queries are in queue or in read/write etc.
2. Overview of mongostat example
I run mongostat on standalone mongoDB server, and find following output on console:
[root@mysoftkey ~]# mongostat
insert query update delete getmore command % dirty % used flushes vsize res qr|qw ar|aw netIn netOut conn time
9 1837 73 1 30 80|0 2.5 79.9 0 4.66G 3.77G 0|0 0|0 316k 6.22m 401 2017-09-18T17:00:33+05:30
9 1984 243 *0 26 78|0 2.5 79.9 0 4.66G 3.77G 0|0 1|0 331k 5.17m 401 2017-09-18T17:00:34+05:30
13 2061 147 *0 20 95|0 2.5 80.0 0 4.66G 3.77G 0|0 2|0 331k 3.82m 401 2017-09-18T17:00:35+05:30
9 2018 137 *0 25 72|0 2.5 80.0 0 4.66G 3.77G 0|0 0|0 335k 5.76m 401 2017-09-18T17:00:36+05:30
3 1392 92 3 39 79|0 2.5 80.0 0 4.66G 3.77G 1|0 0|0 271k 8.05m 401 2017-09-18T17:00:37+05:30
2 1280 28 *0 24 69|0 2.5 80.0 0 4.66G 3.77G 0|0 0|0 194k 4.33m 401 2017-09-18T17:00:38+05:30
9 1827 151 *0 32 78|0 2.5 80.0 0 4.66G 3.77G 1|0 0|0 284k 6.89m 401 2017-09-18T17:00:39+05:30
6 1958 289 *0 28 83|0 2.6 80.0 0 4.66G 3.77G 1|0 1|0 331k 4.96m 401 2017-09-18T17:00:40+05:30
7 1895 177 *0 24 97|0 2.6 78.4 0 4.66G 3.77G 1|0 0|0 320k 5.08m 401 2017-09-18T17:00:41+05:30
sample for replica Set cluster, logged-in into MongoDB server and run mongostat command on terminal and see the following output.
[root@mysoftkey ~]# mongostat insert query update delete getmore command % dirty % used flushes vsize res qr|qw ar|aw netIn netOut conn set repl time *25 464 *5 *1 14 32|0 0.4 33.0 0 21.4G 20.5G 0|0 1|0 65k 4m 215 rs1 SEC 18:05:25 *46 3189 *18 *5 22 16|0 0.4 33.0 0 21.4G 20.5G 0|0 4|0 343k 8m 215 rs1 SEC 18:05:26 *33 2350 *22 *2 21 22|0 0.4 33.0 0 21.4G 20.5G 0|0 1|0 264k 7m 215 rs1 SEC 18:05:27 *31 1872 *6 *2 22 5|0 0.4 33.0 0 21.4G 20.5G 0|0 1|0 205k 7m 215 rs1 SEC 18:05:28 *23 996 *14 *0 23 13|0 0.4 33.0 0 21.4G 20.5G 0|0 1|0 120k 6m 215 rs1 SEC 18:05:29 *35 1429 *13 *2 24 34|0 0.4 33.0 0 21.4G 20.5G 0|0 1|0 166k 7m 215 rs1 SEC 18:05:30 *30 936 *13 *2 9 28|0 0.4 33.0 0 21.4G 20.5G 0|0 1|0 102k 3m 215 rs1 SEC 18:05:31 *19 1095 *2 *1 14 20|0 0.4 33.0 0 21.4G 20.5G 0|0 1|0 125k 4m 215 rs1 SEC 18:05:32
3. mongostat command parameters available
For more help you can use mongostat --help , output as follows:
[root@mysoftkey ~]# mongostat --help Usage: mongostatMonitor 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 more detailed log output (include multiple times for more verbosity, e.g. -vvvvv) --quiet hide all log output connection options: -h, --host= mongodb host to connect to (setname/host1,host2 for replica sets) --port= server port (can also use --host hostname:port) ssl options: --ssl connect to a mongod or mongos that has ssl enabled --sslCAFile= the .pem file containing the root certificate chain from the certificate authority --sslPEMKeyFile= the .pem file containing the certificate and key --sslPEMKeyPassword= the password to decrypt the sslPEMKeyFile, if necessary --sslCRLFile= 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 for authentication -p, --password= password for authentication --authenticationDatabase= database that holds the user's credentials --authenticationMechanism= authentication mechanism to use stat options: --noheaders don't output column names -n, --rowcount= 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 [root@mysoftkey ~]#
5. Reference
You can visit docs.mongodb.com for more details.
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