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mongodb linux下集群搭建过程

时间：2022-11-07 09:38:57 | 栏目：mongodb | 点击：次

mongodb的集群结构如上图

网上有个mongo3.0的集群例子：

https://www.jb51.net/article/191388.htm

router提供入口,mongo客户端通过router连入集群(本例只配置一个route集群)

Config Servers辅助记录数据分片(一个集群)

Shard为数据分片集群(本例中配置两个,用于验证分片),

本例中，为每个集群(shard config)三个mongo实例

config与shard为同一个类型的进程mongod

route则为mongos进程

下载mongo二进制压缩包

https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel70-5.0.6.tgz

解压可以看到

用openssl生成一个key,用于mongo集群内部数据通迅

openssl rand -base64 123 > keyfile

mongod配置为件(config与shard通用)

mongo_node.conf:

storage:
    engine: wiredTiger
    directoryPerDB: true
    journal:
        enabled: true
 
systemLog:
    destination: file
    logAppend: true
operationProfiling:
  slowOpThresholdMs: 10000
replication:
    oplogSizeMB: 10240
processManagement:
    fork: true
security:
    authorization: "disabled"

mongos的配置文件(即图中的route)

mongos.conf:

systemLog:
    destination: file
    logAppend: true
 
processManagement:
    fork: true

启动config集群(3个mongod进程)

WORK_DIR=/home/???/go/mongodb/mongo_test
 
KEYFILE=$WORK_DIR/key/keyfile
cat $KEYFILE
CONFFILE=$WORK_DIR/conf/mongo_node.conf
cat $CONFFILE
MONGOD=mongod
echo $MONGOD
$MONGOD --port 26001 --bind_ip_all --configsvr --replSet configReplSet --keyFile $KEYFILE --dbpath $WORK_DIR/config_cluster/conf_n1/data --pidfilepath $WORK_DIR/config_cluster/conf_n1/db.pid --logpath $WORK_DIR/config_cluster/conf_n1/db.log --config $CONFFILE 
$MONGOD --port 26002 --bind_ip_all --configsvr --replSet configReplSet --keyFile $KEYFILE --dbpath $WORK_DIR/config_cluster/conf_n2/data --pidfilepath $WORK_DIR/config_cluster/conf_n2/db.pid --logpath $WORK_DIR/config_cluster/conf_n2/db.log --config $CONFFILE 
$MONGOD --port 26003 --bind_ip_all --configsvr --replSet configReplSet --keyFile $KEYFILE --dbpath $WORK_DIR/config_cluster/conf_n3/data --pidfilepath $WORK_DIR/config_cluster/conf_n3/db.pid --logpath $WORK_DIR/config_cluster/conf_n3/db.log --config $CONFFILE

启动成功后

用命令mongo --port 26001 --host 127.0.0.1

如下图,进入mongo的shell

在shell中输入如下js代码 设置config集群

cfg={
    _id:"configReplSet", 
    configsvr: true,
    members:[
        {_id:0, host:'127.0.0.1:26001'},
        {_id:1, host:'127.0.0.1:26002'}, 
        {_id:2, host:'127.0.0.1:26003'}
    ]};
rs.initiate(cfg);

三个config mongo进程会自动选出一个primary,过一会再进入shell就会发现 shell提示变成primary

顺便给config添加一个admin用户,(一个集群只要在primary进程添加一次,会自动同步给secondary)

use admin
db.createUser({
    user:'admin',pwd:'123456',
    roles:[
        {role:'clusterAdmin',db:'admin'},
        {role:'userAdminAnyDatabase',db:'admin'},
        {role:'dbAdminAnyDatabase',db:'admin'},
        {role:'readWriteAnyDatabase',db:'admin'}
]})

同样之后shard也做同样的添加用户操作,便于后继观察数据

启动shard

WORK_DIR=/home/???/go/mongodb/mongo_test
 
KEYFILE=$WORK_DIR/key/keyfile
cat $KEYFILE
CONFFILE=$WORK_DIR/conf/mongo_node.conf
cat $CONFFILE
MONGOD=mongod
echo $MONGOD
echo "start shard1 replicaset"
$MONGOD --port 27001 --bind_ip_all --shardsvr --replSet shard1 --keyFile $KEYFILE --dbpath $WORK_DIR/shard1/sh1_n1/data --pidfilepath $WORK_DIR/shard1/sh1_n1/db.pid --logpath $WORK_DIR/shard1/sh1_n1/db.log --config $CONFFILE
$MONGOD --port 27002 --bind_ip_all --shardsvr --replSet shard1 --keyFile $KEYFILE --dbpath $WORK_DIR/shard1/sh1_n2/data --pidfilepath $WORK_DIR/shard1/sh1_n2/db.pid --logpath $WORK_DIR/shard1/sh1_n2/db.log --config $CONFFILE
$MONGOD --port 27003 --bind_ip_all --shardsvr --replSet shard1 --keyFile $KEYFILE --dbpath $WORK_DIR/shard1/sh1_n3/data --pidfilepath $WORK_DIR/shard1/sh1_n3/db.pid --logpath $WORK_DIR/shard1/sh1_n3/db.log --config $CONFFILE

用mongo --port 27001 --host 127.0.0.1进入mongo shell

cfg={
    _id:"shard1", 
    members:[
        {_id:0, host:'127.0.0.1:27001'},
        {_id:1, host:'127.0.0.1:27002'},
        {_id:2, host:'127.0.0.1:27003'}
    ]};
 
rs.initiate(cfg);

同样用之前的添加用户的js

并用同样的方法启动shard2集群,用于实验数据分片

对应的目录与分片名改成shard2

启动route

WORK_DIR=/home/???/go/mongodb/mongo_test
 
KEYFILE=$WORK_DIR/key/keyfile
cat $KEYFILE
CONFFILE=$WORK_DIR/conf/mongos.conf
cat $CONFFILE
MONGOS=mongos
echo $MONGOS
echo "start mongos route instances"
$MONGOS --port=25001 --bind_ip_all --configdb configReplSet/127.0.0.1:26001,127.0.0.1:26002,127.0.0.1:26003 --keyFile $KEYFILE --pidfilepath $WORK_DIR/route/r_n1/db.pid --logpath $WORK_DIR/route/r_n1/db.log --config $CONFFILE
$MONGOS --port 25002 --bind_ip_all --configdb configReplSet/127.0.0.1:26001,127.0.0.1:26002,127.0.0.1:26003 --keyFile $KEYFILE --pidfilepath $WORK_DIR/route/r_n2/db.pid --logpath $WORK_DIR/route/r_n2/db.log --config $CONFFILE
$MONGOS --port 25003 --bind_ip_all --configdb configReplSet/127.0.0.1:26001,127.0.0.1:26002,127.0.0.1:26003 --keyFile $KEYFILE --pidfilepath $WORK_DIR/route/r_n3/db.pid --logpath $WORK_DIR/route/r_n3/db.log --config $CONFFILE

路由添加分片

用mongo --port 25001 --host 127.0.0.1 -u admin -p 123456进入shell

或者这样也可 mongo mongodb://admin:123456@127.0.0.1:25001

在mongo shell分别执行以下两行js

sh.addShard("shard1/127.0.0.1:27001")
sh.addShard("shard2/127.0.0.1:27011")

创建一个mongo database与collection

并设置分片

use test
 
sh.enableSharding("test")
db.createCollection("test_shard")
sh.shardCollection("test.test_shard", {_id:"hashed"}, false, { numInitialChunks: 4} )

在mongo shell用以下js添加数据，可以修改循环次数避免测试时间过长

var cnt = 0;
for(var i=0; i<1000; i++){
    var dl = [];
    for(var j=0; j<100; j++){
        dl.push({
                "bookId" : "BBK-" + i + "-" + j,
                "type" : "Revision",
                "version" : "IricSoneVB0001",
                "title" : "Jackson's Life",
                "subCount" : 10,
                "location" : "China CN Shenzhen Futian District",
                "author" : {
                      "name" : 50,
                      "email" : "RichardFoo@yahoo.com",
                      "gender" : "female"
                },
                "createTime" : new Date()
            });
      }
      cnt += dl.length;
      db.test_shard.insertMany(dl);
      print("insert ", cnt);
}

在windows下安装mongodb，利用自带的compass客户端观察两个shard集群

会发现数据分流到两个集群了

也可以直接连route观察数据

补充：

把js存到文件里给shell执行会比较方便

执行js命令如下:

mongo mongodb://admin:123456@127.0.0.1:25001 ./test.js

示例js代码:

print('=========WECOME==========');
 
conn = new Mongo("mongodb://admin:123456@192.168.2.129:25001");
db = conn.getDB("testjs")
sh.enableSharding("testjs")
db.createCollection("testjs_col")
sh.shardCollection("testjs.testjs_col", {_id:"hashed"}, false, { numInitialChunks: 4} )
    var dl = [];
    for(var j=0; j<10; j++){
        dl.push({
                "bookId" : "BBK-" + 0 + "-" + j,
                "type" : "Revision",
                "version" : "IricSoneVB0001",
                "title" : "Jackson's Life",
                "subCount" : 10,
                "location" : "China CN Shenzhen Futian District",
                "author" : {
                      "name" : 50,
                      "email" : "RichardFoo@yahoo.com",
                      "gender" : "female"
                },
                "createTime" : new Date()
            });
    }
    db.testjs_col.insertMany(dl);
cursor = db.testjs_col.find();
printjson(cursor.toArray());

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