关于MongoDB最大连接数的查看与修改
在Linux平台下，无论是64位或者32位的MongoDB默认最大连接数都是819，WIN平台不知道，估计也没有人在 WIN平台下使用MongoDB做生产环境#./bin/mongo 192.168.6.42
MongoDB shell version: 2.4.1
connecting to: 192.168.6.42/test
> db.serverStatus().connections
{" current " : 1," available " : 818," totalCreated
"
: NumberLong(1) }
途中available显示818少了一个，表示空闲的。current表示已经占用了的连接数，两数一加就等于819，如果我现在在连接一个，那么available就是817，current就是2
#./bin/mongo 192.168.6.42
MongoDB shell version: 2.4.1
connecting to: 192.168.6.42/test
> db.serverStatus().connections
{" current " : 1," available " : 818," totalCreated " : NumberLong(1) }
> db.serverStatus().connections
{" current " : 2," available " : 817," totalCreated
"
: NumberLong(2) }
819个连接数对于一般的站点我认为已经够用，并且都是现连现取现断。但这个连接数也可以修改，只要在启动的时候加入--maxConns即可
服务器启动
#./bin/mongod --dbpath=/root/db --maxConns=2000
Wed Apr 3 11:06:21.905 MongoDB starting : pid=2812 port=27017 dbpath=/root/db 64-bit host=lee
Wed Apr 3 11:06:21.957 db version v2.4.1
Wed Apr 3 11:06:21.957 git version: 1560959e9ce11a693be8b4d0d160d633eee75110
Wed Apr 3 11:06:21.957 build info: Linux ip-10-2-29-40 2.6.21.7-2.ec2.v1.2.fc8xen# 1 SMP Fri Nov 20 17:48:28 EST 2009 x86_64 BOOST_LIB_VERSION=1_49
Wed Apr 3 11:06:21.957 allocator: tcmalloc
Wed Apr 3 11:06:21.957 options: { dbpath:" /root/db " , maxConns: 2000 }
Wed Apr 3 11:06:21.982 journal dir=/root/db/journal
Wed Apr 3 11:06:21.982 recover : no journal files present, no recovery needed
Wed Apr 3 11:06:22.297 preallocateIsFaster=true 2.62
Wed Apr 3 11:06:22.717 --maxConns too high, can only handle 819
Wed Apr 3 11:06:22.724 waitingfor connections on port 27017
Wed Apr 3 11:06:22.725 admin web console waitingfor connections on port 28017
Wed Apr 3 11:06:25.126 connection acceptedfrom 192.168.4.86:53917#
1 (1 connection now open)
查询最大连接数
#./bin/mongo 192.168.6.42
MongoDB shell version: 2.4.1
connecting to: 192.168.6.42/test
> db.serverStatus().connections
{" current " : 1," available " : 818," totalCreated " : NumberLong(1) }
>
发现还是819？其实是Linux默认进程能打开最大文件数有关，可以通过ulimit 解决
#ulimit -n 2500
#./bin/mongod --dbpath=/root/db --maxConns=2000
Wed Apr 3 11:11:07.013 MongoDB starting : pid=2930 port=27017 dbpath=/root/db 64-bit host=lee
Wed Apr 3 11:11:07.013 db version v2.4.1
Wed Apr 3 11:11:07.013 git version: 1560959e9ce11a693be8b4d0d160d633eee75110
Wed Apr 3 11:11:07.013 build info: Linux ip-10-2-29-40 2.6.21.7-2.ec2.v1.2.fc8xen# 1 SMP Fri Nov 20 17:48:28 EST 2009 x86_64 BOOST_LIB_VERSION=1_49
Wed Apr 3 11:11:07.013 allocator: tcmalloc
Wed Apr 3 11:11:07.013 options: { dbpath:" /root/db " , maxConns: 2000 }
Wed Apr 3 11:11:07.031 journal dir=/root/db/journal
Wed Apr 3 11:11:07.031 recover : no journal files present, no recovery needed
Wed Apr 3 11:11:07.170 waitingfor connections on port 27017
Wed Apr 3 11:11:07.171 admin web console waitingfor connections on port 28017
Wed Apr 3 11:11:10.076 connection acceptedfrom 192.168.4.86:53161#
1 (1 connection now open)
再查看最大连接数，搞定
#./bin/mongo 192.168.6.42
MongoDB shell version: 2.4.1
connecting to: 192.168.6.42/test
> db.serverStatus().connections
{" current " : 1," available " : 1999," totalCreated " : NumberLong(1) }
>
关于ulimit的更多知识大家可以去网上检索检索
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