mongodb 分片规划与配置

### 1.1 分片规划

```
10个实例：38017-38026
(1)configserver:
3台构成的复制集（1主两从，不支持arbiter）38018-38020
(2)shard节点：
sh1：38021-23 （1主两从，其中一个节点为arbiter，复制集名字sh1）
sh2：38024-26 （1主两从，其中一个节点为arbiter，复制集名字sh2）
(3)mongos
38017
```

### 1.2 配置过程

```
a. shard复制集配置：
1. 创建：
mkdir -p /mongodb/38021/conf /mongodb/38021/log /mongodb/38021/data
mkdir -p /mongodb/38022/conf /mongodb/38022/log /mongodb/38022/data
mkdir -p /mongodb/38023/conf /mongodb/38023/log /mongodb/38023/data
mkdir -p /mongodb/38024/conf /mongodb/38024/log /mongodb/38024/data
mkdir -p /mongodb/38025/conf /mongodb/38025/log /mongodb/38025/data
mkdir -p /mongodb/38026/conf /mongodb/38026/log /mongodb/38026/data

2. 配置文件：

sh1:
vi /mongodb/38021/conf/mongodb.conf
===============
根据需求修改相应参数：
systemLog:
destination: file
path: /mongodb/38021/log/mongodb.log
logAppend: true
storage:
journal:
enabled: true
dbPath: /mongodb/38021/data
directoryPerDB: true
#engine: wiredTiger
wiredTiger:
engineConfig:
cacheSizeGB: 0.5
directoryForIndexes: true
collectionConfig:
blockCompressor: zlib
indexConfig:
prefixCompression: true
net:
bindIp: 192.168.2.6,127.0.0.1
port: 38021
replication:
oplogSizeMB: 2048
replSetName: sh1
sharding:
clusterRole: shardsvr
processManagement:
fork: true

===============
cp /mongodb/38021/conf/mongodb.conf /mongodb/38022/conf/
cp /mongodb/38021/conf/mongodb.conf /mongodb/38023/conf/

sed 's#38021#38022#g' /mongodb/38022/conf/mongodb.conf -i
sed 's#38021#38023#g' /mongodb/38023/conf/mongodb.conf -i

sh2:
vi /mongodb/38024/conf/mongodb.conf
========
根据需求修改相应参数：
systemLog:
destination: file
path: /mongodb/38024/log/mongodb.log
logAppend: true
storage:
journal:
enabled: true
dbPath: /mongodb/38024/data
directoryPerDB: true
wiredTiger:
engineConfig:
cacheSizeGB: 1
directoryForIndexes: true
collectionConfig:
blockCompressor: zlib
indexConfig:
prefixCompression: true
net:
bindIp: 192.168.2.6,127.0.0.1
port: 38024
replication:
oplogSizeMB: 2048
replSetName: sh2
sharding:
clusterRole: shardsvr
processManagement:
fork: true
========

cp /mongodb/38024/conf/mongodb.conf /mongodb/38025/conf/
cp /mongodb/38024/conf/mongodb.conf /mongodb/38026/conf/

sed 's#38024#38025#g' /mongodb/38025/conf/mongodb.conf -i
sed 's#38024#38026#g' /mongodb/38026/conf/mongodb.conf -i

3. 所有节点，并搭建复制集：

mongod -f /mongodb/38021/conf/mongodb.conf
mongod -f /mongodb/38022/conf/mongodb.conf
mongod -f /mongodb/38023/conf/mongodb.conf
mongod -f /mongodb/38024/conf/mongodb.conf
mongod -f /mongodb/38025/conf/mongodb.conf
mongod -f /mongodb/38026/conf/mongodb.conf

 

mongo --port 38021

use admin
config = {_id: 'sh1', members: [
{_id: 0, host: '192.168.2.6:38021'},
{_id: 1, host: '192.168.2.6:38022'},
{_id: 2, host: '192.168.2.6:38023',"arbiterOnly":true}]
}

rs.initiate(config)


mongo --port 38024
use admin
config = {_id: 'sh2', members: [
{_id: 0, host: '192.168.2.6:38024'},
{_id: 1, host: '192.168.2.6:38025'},
{_id: 2, host: '192.168.2.6:38026',"arbiterOnly":true}]
}

rs.initiate(config)

=-=----=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
b.config节点配置：

1. 目录创建：
mkdir -p /mongodb/38018/conf /mongodb/38018/log /mongodb/38018/data
mkdir -p /mongodb/38019/conf /mongodb/38019/log /mongodb/38019/data
mkdir -p /mongodb/38020/conf /mongodb/38020/log /mongodb/38020/data

2. 修改配置文件：

[mongod@server1 ~]$ vi /mongodb/38018/conf/mongodb.conf

systemLog:
destination: file
path: /mongodb/38018/log/mongodb.conf
logAppend: true
storage:
journal:
enabled: true
dbPath: /mongodb/38018/data
directoryPerDB: true
#engine: wiredTiger
wiredTiger:
engineConfig:
cacheSizeGB: 1
directoryForIndexes: true
collectionConfig:
blockCompressor: zlib
indexConfig:
prefixCompression: true
net:
bindIp: 192.168.2.6,127.0.0.1
port: 38018
replication:
oplogSizeMB: 2048
replSetName: configReplSet
sharding:
clusterRole: configsvr
processManagement:
fork: true

cp /mongodb/38018/conf/mongodb.conf /mongodb/38019/conf/
cp /mongodb/38018/conf/mongodb.conf /mongodb/38020/conf/

sed 's#38018#38019#g' /mongodb/38019/conf/mongodb.conf -i
sed 's#38018#38020#g' /mongodb/38020/conf/mongodb.conf -i

3. 启动节点，并配置复制集

mongod -f /mongodb/38018/conf/mongodb.conf
mongod -f /mongodb/38019/conf/mongodb.conf
mongod -f /mongodb/38020/conf/mongodb.conf

mongo --port 38018
use admin

config = {_id: 'configReplSet', members: [
{_id: 0, host: '192.168.2.6:38018'},
{_id: 1, host: '192.168.2.6:38019'},
{_id: 2, host: '192.168.2.6:38020'}]
}
rs.initiate(config)


注：configserver 可以是一个节点，官方建议复制集。configserver不能有arbiter。
新版本中，要求必须是复制集。
注：mongodb 3.4之后，虽然要求config server为replica set，但是不支持arbiter

===============================
c. mongos节点配置：
1. 创建目录：
mkdir -p /mongodb/38017/conf /mongodb/38017/log

2配置文件：
vi /mongodb/38017/conf/mongos.conf
systemLog:
destination: file
path: /mongodb/38017/log/mongos.log
logAppend: true
net:
bindIp: 192.168.2.6,127.0.0.1
port: 38017
sharding:
configDB: configReplSet/192.168.2.6:38018,192.168.2.6:38019,192.168.2.6:38020
processManagement:
fork: true

3. 启动mongos

mongos -f /mongodb/38017/conf/mongos.conf

d. 分片集群操作：

连接到其中一个mongos（192.168.2.6），做以下配置
（1）连接到mongs的admin数据库
# su - mongod
$ mongo 192.168.2.6:38017/admin

（2）添加分片
db.runCommand( { addshard : "sh1/192.168.2.6:38021,192.168.2.6:38022,192.168.2.6:38023",name:"shard1"} )
db.runCommand( { addshard : "sh2/192.168.2.6:38024,192.168.2.6:38025,192.168.2.6:38026",name:"shard2"} )

（3）列出分片
mongos> db.runCommand( { listshards : 1 } )

（4）整体状态查看
mongos> sh.status();