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http://docs.mongodb.org/manual/reference/program/mongostat/#cmdoption--host
To connect to a replica set, specify the replSetName and a seed list of set members, as in the following:
<replSetName>/<hostname1><:port>,<hostname2><:port>,<...>
Except this doesn't work:
$ mongostat --host replset/penguin:27018,penguin:27019,penguin:27017
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insert query update delete getmore command flushes mapped vsize res faults locked db idx miss % qr|qw ar|aw netIn netOut conn set repl time
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penguin:27017 *0 *0 *0 *0 0 2|0 0 336m 3.12g 10m 0 local:0.0% 0 0|0 0|0 218b 3k 7 replset PRI 16:41:18
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penguin:27019 *0 *0 *0 *0 0 2|0 0 336m 3.11g 10m 0 local:0.0% 0 0|0 0|0 218b 3k 3 replset SEC 16:41:18
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replset/penguin:27018 socket exception [CONNECT_ERROR] for replset/penguin:27018 (replset/penguin) failed
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2015-05-05T16:41:18.622+1000 warning: Failed to connect to replset/penguin:0, reason: errno:2 No such file or directory
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$ mongostat --host penguin:27018,penguin:27019,penguin:27017
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insert query update delete getmore command flushes mapped vsize res faults locked db idx miss % qr|qw ar|aw netIn netOut conn set repl time
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penguin:27017 *0 *0 *0 *0 1 1|0 0 336m 3.12g 8m 0 local:0.0% 0 0|0 0|0 109b 3k 7 replset PRI 16:48:27
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penguin:27018 *0 *0 *0 *0 0 3|0 0 336m 3.11g 9m 0 local:0.0% 0 0|0 0|0 374b 3k 3 replset SEC 16:48:27
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penguin:27019 *0 *0 *0 *0 0 3|0 0 336m 3.11g 8m 0 local:0.0% 0 0|0 0|0 374b 3k 3 replset SEC 16:48:27
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