mongodb4.2

默认情况下，MongoDB使用mongod用户帐户运行。创建后，将这些目录的所有者和组设置为mongod：

安装：/use/local/mongodb

configsvr：mkdir -p /test/configsvr/{27011,27012,27013}/data # 3个

启动configsvr：
/usr/local/mongodb/bin/mongod --dbpath=/test/configsvr/27011/data/ --port 27011 --fork --logpath=/test/configsvr/27011/configsvr.log --logappend --bind_ip_all --replSet=testconfigsvr --configsvr
/usr/local/mongodb/bin/mongod --dbpath=/test/configsvr/27012/data/ --port 27012 --fork --logpath=/test/configsvr/27012/configsvr.log --logappend --bind_ip_all --replSet=testconfigsvr --configsvr
/usr/local/mongodb/bin/mongod --dbpath=/test/configsvr/27013/data/ --port 27013 --fork --logpath=/test/configsvr/27013/configsvr.log --logappend --bind_ip_all --replSet=testconfigsvr --configsvr

 配置：

 /usr/local/mongodb/bin/mongo --port 27011

rs.initiate({_id:'testconfigsvr',members:[{_id:0,host:'127.0.0.1:27011'},{_id:1,host:'127.0.0.1:27012'},{_id:2,host:'127.0.0.1:27013'}]})

mongos：路由 # mkdir -p /test/mongos

/usr/local/mongodb/bin/mongos --port 27017 --configdb testconfigsvr/127.0.0.1:27011,127.0.0.1:27012,127.0.0.1:27013 --fork --logpath  /test/mongos/mongos.log --logappend

/usr/local/mongodb/bin/mongo # 登录

mongos> sh.status()
--- Sharding Status --- 
  sharding version: {
      "_id" : 1,
      "minCompatibleVersion" : 5,
      "currentVersion" : 6,
      "clusterId" : ObjectId("5e5962d1f685b7a247e323c0")
  }
  shards:
  active mongoses:
  autosplit:
        Currently enabled: yes
  balancer:
        Currently enabled:  yes
        Currently running:  no
        Failed balancer rounds in last 5 attempts:  0
        Migration Results for the last 24 hours: 
                No recent migrations
  databases:
        {  "_id" : "config",  "primary" : "config",  "partitioned" : true }

mongos> 

shardsvr：mkdir -p /test/mongodb/{27021,27022}/data

/usr/local/mongodb/bin/mongod --dbpath /test/mongodb/27021/data --logpath /test/mongodb/27021/mongo.log --logappend --fork --port 27021 --shardsvr
/usr/local/mongodb/bin/mongod --dbpath /test/mongodb/27022/data --logpath /test/mongodb/27022/mongo.log --logappend --fork --port 27022 --shardsvr

/usr/local/mongodb/bin/mongo # 登录

mongos> sh.addShard("127.0.0.1:27021")
{
    "shardAdded" : "shard0000",
    "ok" : 1,
    "operationTime" : Timestamp(1582917561, 4),
    "$clusterTime" : {
        "clusterTime" : Timestamp(1582917561, 4),
        "signature" : {
            "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
            "keyId" : NumberLong(0)
        }
    }
}
mongos> sh.addShard("127.0.0.1:27022")

mongos> sh.status()
--- Sharding Status --- 
  sharding version: {
      "_id" : 1,
      "minCompatibleVersion" : 5,
      "currentVersion" : 6,
      "clusterId" : ObjectId("5e5962d1f685b7a247e323c0")
  }
  shards:
        {  "_id" : "shard0000",  "host" : "127.0.0.1:27021",  "state" : 1 }
        {  "_id" : "shard0001",  "host" : "127.0.0.1:27022",  "state" : 1 }
  active mongoses:
        "4.2.3" : 1
  autosplit:
        Currently enabled: yes
  balancer:
        Currently enabled:  yes
        Currently running:  no
        Failed balancer rounds in last 5 attempts:  0
        Migration Results for the last 24 hours: 
                No recent migrations
  databases:
        {  "_id" : "config",  "primary" : "config",  "partitioned" : true }

mongos> 

Replica set options:
  --replSet arg                         arg is <setname>

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

Storage options:
  --dbpath arg
----------------------
rs.status()
rs.initiate()
rs.initiate(cfg)
rs.conf()
rs.reconfig(cfg)
rs.add(hostportstr)
rs.slaveOk()
db.isMaster()
--------------------------
副本集的重新选举影响条件：
心跳，优先级，optime，网络
------------------------------
->mongos:Route；config server:元数据服务器；shard:数据节点，mongod实例；

sh.enableSharding(dbname, shardName)
mongos> sh.enableSharding("testdb")

sh.shardCollection(fullName,key,unique,options)
sh.shardCollection("testdb.user",{"user_no":1})