根据上篇文章《图解mongodb原理》的基本介绍，本文以具体的操作为例继续深入解析mongodb。 演示的所有服务都是在一台机器上，我的目录是f:\java\mongodb\cluster，文件结构如下： 说明：1个配置服务结点，1个路由服务结点，三个分片结点。 vcd4kpha+phn0cm9u
根据上篇文章《图解mongodb原理》的基本介绍，本文以具体的操作为例继续深入解析mongodb。
演示的所有服务都是在一台机器上，我的目录是f:\java\mongodb\cluster，文件结构如下：
说明：1个配置服务结点，1个路由服务结点，三个分片结点。
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code : 10185
} at src/mongo/shell/query.js:128
删除分片时上个任务未完成时报错：
mongos> db.runcommand({removeshard:127.0.0.1:27032})
{ ok : 0, errmsg : can't have more than one draining shard at a time }
mongovue连接测试
连接界面如下：
查看分片：
每个chunk 的大小（size）（单位为mb）：
单个分片存储数据效果：
增加分片shard2和shard3后的balancer操作过程：
分片后的数据：
查看所有的数据库，其中partitioned为true表示这个数据库设置了分片。
config数据库的结构：
查看服务状态，可以看到mongodb支持的最大连接数为20000：
mongod启动参数
当启动参数报错时会有提示，还有参数的英文解释：
general options:
-h [ --help ] show this usage information
--version show version information
-f [ --config ] arg configuration file specifying additional options
-v [ --verbose ] be more verbose (include multiple times for more
verbosity e.g. -vvvvv)
--quiet quieter output
--port arg specify port number - 27017 by default
--bind_ip arg comma separated list of ip addresses to listen on
- all local ips by default
--maxconns arg max number of simultaneous connections - 20000 by
default
--logpath arg log file to send write to instead of stdout - has
to be a file, not directory
--logappend append to logpath instead of over-writing
--pidfilepath arg full path to pidfile (if not set, no pidfile is
created)
--keyfile arg private key for cluster authentication
--setparameter arg set a configurable parameter
--auth run with security
--cpu periodically show cpu and iowait utilization
--dbpath arg directory for datafiles - defaults to \data\db\
--diaglog arg 0=off 1=w 2=r 3=both 7=w+some reads
--directoryperdb each database will be stored in a separate
directory
--ipv6 enable ipv6 support (disabled by default)
--journal enable journaling
--journalcommitinterval arg how often to group/batch commit (ms)
--journaloptions arg journal diagnostic options
--jsonp allow jsonp access via http (has security
implications)
--noauth run without security
--nohttpinterface disable http interface
--nojournal disable journaling (journaling is on by default
for 64 bit)
--noprealloc disable data file preallocation - will often hurt
performance
--noscripting disable scripting engine
--notablescan do not allow table scans
--nssize arg (=16) .ns file size (in mb) for new databases
--profile arg 0=off 1=slow, 2=all
--quota limits each database to a certain number of files
(8 default)
--quotafiles arg number of files allowed per db, requires --quota
--repair run repair on all dbs
--repairpath arg root directory for repair files - defaults to
dbpath
--rest turn on simple rest api
--slowms arg (=100) value of slow for profile and console log
--smallfiles use a smaller default file size
--syncdelay arg (=60) seconds between disk syncs (0=never, but not
recommended)
--sysinfo print some diagnostic system information
--upgrade upgrade db if needed
windows service control manager options:
--install install windows service
--remove remove windows service
--reinstall reinstall windows service (equivalent to --remove
followed by --install)
--servicename arg windows service name
--servicedisplayname arg windows service display name
--servicedescription arg windows service description
--serviceuser arg account for service execution
--servicepassword arg password used to authenticate serviceuser
replication options:
--oplogsize arg size to use (in mb) for replication op log. default is
5% of disk space (i.e. large is good)
master/slave options (old; use replica sets instead):
--master master mode
--slave slave mode
--source arg when slave: specify master as
--only arg when slave: specify a single database to replicate
--slavedelay arg specify delay (in seconds) to be used when applying
master ops to slave
--autoresync automatically resync if slave data is stale
replica set options:
--replset arg arg is [/]
--replindexprefetch arg specify index prefetching behavior (if secondary)
[none_id_only|all]
sharding options:
--configsvr declare this is a config db of a cluster; default port
27019; default dir /data/configdb
--shardsvr declare this is a shard db of a cluster; default port
27018
mongos启动参数
general options:
-h [ --help ] show this usage information
--version show version information
-f [ --config ] arg configuration file specifying additional options
-v [ --verbose ] be more verbose (include multiple times for more
verbosity e.g. -vvvvv)
--quiet quieter output
--port arg specify port number - 27017 by default
--bind_ip arg comma separated list of ip addresses to listen on - all
local ips by default
--maxconns arg max number of simultaneous connections - 20000 by
default
--logpath arg log file to send write to instead of stdout - has to be
a file, not directory
--logappend append to logpath instead of over-writing
--pidfilepath arg full path to pidfile (if not set, no pidfile is
created)
--keyfile arg private key for cluster authentication
--setparameter arg set a configurable parameter
--nohttpinterface disable http interface
windows service control manager options:
--install install windows service
--remove remove windows service
--reinstall reinstall windows service (equivalent to --remove
followed by --install)
--servicename arg windows service name
--servicedisplayname arg windows service display name
--servicedescription arg windows service description
--serviceuser arg account for service execution
--servicepassword arg password used to authenticate serviceuser
sharding options:
--configdb arg 1 or 3 comma separated config servers
--localthreshold arg ping time (in ms) for a node to be considered local
(default 15ms)
--test just run unit tests
--upgrade upgrade meta data version
--chunksize arg maximum amount of data per chunk
--ipv6 enable ipv6 support (disabled by default)
--jsonp allow jsonp access via http (has security implications)
--noscripting disable scripting engine
分片+主从安装命令
主从的部署是不具有故障自动转移功能的，而复本集的部署支持故障转移。
主数据结点：
mongod -shardsvr -master -port 27001 -dbpath f:\java\mongodb\cluster\shard\data
从数据结点：
mongod -shardsvr -slave -source 127.0.0.1:27001 -port 27002 -dbpath f:\java\mongodb\cluster\shards\data
分片+复本集安装
复本集安装要对每个分片进行设置，用mongo直接连接分片，执行rs.initiate(cfg)进行设置，设置好后需要分别将每个分片加入config中。相关的函数有：
rs.status() { replsetgetstatus : 1 } checks repl set status
rs.initiate() { replsetinitiate : null } initiates set with default settings
rs.initiate(cfg) { replsetinitiate : cfg } initiates setwith configuration cfg
rs.conf() get the current configuration object from local.system.replset
rs.reconfig(cfg) updates the configuration of a running replica set with cfg (disconnects)
rs.add(hostportstr) add a new member to the set with default attributes (disconnects)
rs.add(membercfgobj) add a new member to the set with extra attributes (disconnects)
rs.addarb(hostportstr) add a new member which is arbiteronly:true (disconnects)
rs.stepdown([secs]) step down as primary (momentarily) (disconnects)
rs.syncfrom(hostportstr) make a secondary to sync from the givenmember
rs.freeze(secs) make a node ineligible to become primary for the time specified
rs.remove(hostportstr) remove a host from the replica set (disconnects)
rs.slaveok() shorthand for db.getmongo().setslaveok()
启动命令
路由结点：
mongos -configdb 127.0.0.1:20000 -port 30000 -chunksize 5
配置结点：
mongod -configsvr -dbpath f:\java\mongodb\cluster\config\data -port 20000 -rest
分片1：
mongod -shardsvr -replset shard1/127.0.0.1:27051,127.0.0.1:27041 -port 27031 -dbpath f:\java\mongodb\cluster\repa_shard1\data
分片1复本集b：
mongod -shardsvr -replset shard1/127.0.0.1:27051 -port 27041 -dbpath f:\java\mongodb\cluster\repb_shard1\data
分片1复本集c：
mongod -shardsvr -replset shard1/127.0.0.1:27041 -port 27051 -dbpath f:\java\mongodb\cluster\repc_shard1\data
分片2：
mongod -shardsvr -replset shard2/127.0.0.1:27052,127.0.0.1:27042 -port 27032 -dbpath f:\java\mongodb\cluster\repa_shard2\data
分片2复本集b：
mongod -shardsvr -replset shard2/127.0.0.1:27052 -port 27042 -dbpath f:\java\mongodb\cluster\repb_shard2\data
分片2复本集c：
mongod -shardsvr -replset shard2/127.0.0.1:27042 -port 27052 -dbpath f:\java\mongodb\cluster\repc_shard2\data
web控制台
分片服务与配置服务的mongod加上-rest后会有web控制台，具体的地址在启动输出中会有，如下