使用 Docker 部署 MongoDB 分片

创建配置服务复制集

docker run --name configsvr0 -d mongo:3.6.2-jessie --configsvr --replSet "rs_configsvr"  --bind_ip_all
docker run --name configsvr1 -d mongo:3.6.2-jessie --configsvr --replSet "rs_configsvr"  --bind_ip_all
docker run --name configsvr2 -d mongo:3.6.2-jessie --configsvr --replSet "rs_configsvr"  --bind_ip_all

$ docker ps
IMAGE                COMMAND                  CREATED             STATUS              PORTS               NAMES
mongo:3.6.2-jessie   "docker-entrypoint..."   8 seconds ago       Up 6 seconds        27019/tcp           configsvr2
mongo:3.6.2-jessie   "docker-entrypoint..."   9 seconds ago       Up 7 seconds        27019/tcp           configsvr1
mongo:3.6.2-jessie   "docker-entrypoint..."   19 seconds ago      Up 16 seconds       27019/tcp           configsvr0

通过 docker inspect 找到三个配置服务实例的 IP。
比如 docker inspect configsvr0 | grep IPAddress，
又由于--configsvr 的默认端口为 27019。所以配置服务的地址为

• configsvr0: 172.17.0.2:27019
• configsvr1: 172.17.0.3:27019
• configsvr2: 172.17.0.4:27019

初始化

docker exec -it configsvr0 bash

mongo --host 172.17.0.2 --port 27019

rs.initiate(
  {
    _id: "rs_configsvr",
    configsvr: true,
    members: [
      { _id : 0, host : "172.17.0.2:27019" },
      { _id : 1, host : "172.17.0.3:27019" },
      { _id : 2, host : "172.17.0.4:27019" }
    ]
  }
)

连接字符串为

mongodb://172.17.0.2:27019,172.17.0.3:27019,172.17.0.4:27019/test?replicaSet=rs_configsvr

创建分片复制集

与上面同理，不再赘述，直接上命令行。

docker run --name shardsvr00 -d mongo:3.6.2-jessie --shardsvr --replSet "rs_shardsvr0"  --bind_ip_all
docker run --name shardsvr01 -d mongo:3.6.2-jessie --shardsvr --replSet "rs_shardsvr0"  --bind_ip_all
docker run --name shardsvr02 -d mongo:3.6.2-jessie --shardsvr --replSet "rs_shardsvr0"  --bind_ip_all
docker run --name shardsvr10 -d mongo:3.6.2-jessie --shardsvr --replSet "rs_shardsvr1"  --bind_ip_all
docker run --name shardsvr11 -d mongo:3.6.2-jessie --shardsvr --replSet "rs_shardsvr1"  --bind_ip_all
docker run --name shardsvr12 -d mongo:3.6.2-jessie --shardsvr --replSet "rs_shardsvr1"  --bind_ip_all

通过 docker inspect 找到对应实例的 IP。
比如 docker inspect shardsvr00 | grep IPAddress，
又由于--shardsvr 的默认端口为 27018。所以地址为

• shardsvr00: 172.17.0.5:27018
• shardsvr01: 172.17.0.6:27018
• shardsvr02: 172.17.0.7:27018

由于后来才增加的 shardsvr1，所以 IP 末尾是 9 而不是 8。

• shardsvr10: 172.17.0.9:27018
• shardsvr11: 172.17.0.10:27018
• shardsvr12: 172.17.0.11:27018

$ docker exec -it shardsvr00 bash

mongo --host 172.17.0.5 --port 27018

> rs.initiate(
  {
    _id : "rs_shardsvr",
    members: [
      { _id : 0, host : "172.17.0.5:27018" },
      { _id : 1, host : "172.17.0.6:27018" },
      { _id : 2, host : "172.17.0.7:27018" }
    ]
  }
)

# 输出 { "ok" : 1 }

mongo --host 172.17.0.9 --port 27018

> rs.initiate(
  {
    _id : "rs_shardsvr1",
    members: [
      { _id : 0, host : "172.17.0.9:27018" },
      { _id : 1, host : "172.17.0.10:27018" },
      { _id : 2, host : "172.17.0.11:27018" }
    ]
  }
)

连接字符串为

mongodb://172.17.0.5:27018,172.17.0.6:27018,172.17.0.7:27018/test?replicaSet=rs_shardsvr0

mongodb://172.17.0.9:27018,172.17.0.10:27018,172.17.0.11:27018/test?replicaSet=rs_shardsvr1

连接 mongos 到分片集群

由于镜像的默认入口是 mongod，所以要通过 --entrypoint "mongos" 将其改为 mongos：

docker run --name mongos0 -d --entrypoint "mongos" mongo:3.6.2-jessie --configdb rs_configsvr/172.17.0.2:27019,172.17.0.3:27019,172.17.0.4:27019 --bind_ip_all

地址为 172.17.0.8:27017

增加分片到集群

$ docker exec -it mongos bash

$ mongo --host 172.17.0.8 --port 27017

> sh.addShard("rs_shardsvr0/172.17.0.5:27018,172.17.0.6:27018,172.17.0.7:27018")
{
    "shardAdded" : "rs_shardsvr",
    "ok" : 1,
    "$clusterTime" : {
        "clusterTime" : Timestamp(1518405986, 8),
        "signature" : {
            "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
            "keyId" : NumberLong(0)
        }
    },
    "operationTime" : Timestamp(1518405986, 8)
}

> sh.addShard("rs_shardsvr1/172.17.0.9:27018,172.17.0.10:27018,172.17.0.11:27018")

数据库启用分片

> sh.enableSharding("test")

{
    "ok" : 1,
    "$clusterTime" : {
        "clusterTime" : Timestamp(1518406101, 8),
        "signature" : {
            "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
            "keyId" : NumberLong(0)
        }
    },
    "operationTime" : Timestamp(1518406101, 8)
}

分片 Collection

对 test.order 的 _id 字段进行哈希分片：

> sh.shardCollection("test.order", {"_id": "hashed" })

{
    "collectionsharded" : "test.order",
    "collectionUUID" : UUID("12b22b5d-93d7-4ccf-b989-2a0e550e750f"),
    "ok" : 1,
    "$clusterTime" : {
        "clusterTime" : Timestamp(1518406317, 12),
        "signature" : {
            "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
            "keyId" : NumberLong(0)
        }
    },
    "operationTime" : Timestamp(1518406317, 6)
}

插入数据

use test

for (i = 1; i <= 1000; i=i+1){
    db.order.insert({'price': 1})
}

查看数据分布

mongos> db.order.find().count()
1000

rs_shardsvr0:PRIMARY> db.order.find().count()
526

rs_shardsvr1:PRIMARY> db.order.find().count()
474