mongodb使用docker搭建replicaSet集群与变更监听(最新推荐)

安装环境

mongodb版本：mongodb-6.0.5

两台主机：主机1(192.168.1.11)、主机2(192.168.1.12)

docker方式mongodb集群安装

在主机1和主机2上安装好docker，并确保两台主机能正常通信

目录与key准备

在启动mongodb前，先准备好对应的目录与访问key

#在所有主机都创建用于存储mongodb数据的文件夹
mkdir -p ~/mongo-data/{data,key,backup}
#设置key文件，用于在集群机器间互相访问，各主机的key需要保持一致
cd ~/mongo-data
#在某一节点创建key
openssl rand -base64 123 > key/mongo-rs.key
sudo chown 999 key/mongo-rs.key
#不能是755, 权限太大不行.
sudo chmod 600 key/mongo-rs.key
#将key复制到他节点
scp key/mongo-rs.key root@192.168.1.12:/root/mongo-data/key

以上操作在各主机中创建了 ~/mongo-data/{data,key,backup} 这3个目录，且mongo-rs.key的内容一致。

运行mongodb

执行下列命令，启动mongodb

sudo docker run –name mongo –network=host -p 27017:27017 -v ~/mongo-data/data:/data/db -v ~/mongo-data/backup:/data/backup -v ~/mongo-data/key:/data/key -v /etc/localtime:/etc/localtime -e MONGO_INITDB_ROOT_USERNAME=admin -e MONGO_INITDB_ROOT_PASSWORD=123456 -d mongo:6.0.5 –replSet haiyangReplset –auth –keyFile /data/key/mongo-rs.key –bind_ip_all

上面主要将27017端口映射到主机中，并设了admin的默认密码为123456。–replSet为指定开启replicaSet，后面跟的为副本集的名称。

配置节点

进入某一节点，进行集群配置

sudo docker exec -it mongo bashmongosh

初始化集群前先登录验证超级管理员admin

use admindb.auth(“admin”,“123456”)

再执行以下命令进行初始化

var config={
_id:\”haiyangReplset\”,
members:[
{_id:0,host:\”192.168.1.11:27017\”},
{_id:1,host:\”192.168.1.12:27017\”},
]};
rs.initiate(config)

执行成功后，可以看到一个节点为主节点，另一个节点为从节点

其他相关命令

#查看副本集状态
rs.status()
#查看副本集配置
rs.conf()
#添加节点
rs.add( { host: \”ip:port\”} )
#删除节点
rs.remove(\’ip:port\’)

官方客户端验证

在mongodb安装好后，再用客户端连接验证一下。官方mongodb的客户端下载地址为：https://www.mongodb.com/try/download/compass

下载完毕后，在客户端中新建连接。在本例中，则mongodb的连接地址为:

mongodb://admin:123456@192.168.1.11:27017,192.168.1.12:27017/?authMechanism=DEFAULT&authSource=admin&replicaSet=haiyangReplset

库与监控信息一目了然~

变更监听

对于mongodb操作的api在mongodb的官网有比较完备的文档，java的文档连接为：https://www.mongodb.com/docs/drivers/java/sync/v4.9/

这里试一下mongodb中一个比较强悍的功能，记录的变更监听。用这项功能来做一些审计的场景则会非常方便。

官方链接为：https://www.mongodb.com/docs/drivers/java/sync/v4.9/usage-examples/watch/

这里以java客户端为例写个小demo，试一下对于mongodb中集合的创建及watch功能。

package io.github.puhaiyang;

import com.google.common.collect.Lists;
import com.mongodb.client.*;
import org.apache.commons.lang3.StringUtils;
import org.bson.Document;
import org.bson.conversions.Bson;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.Scanner;
import java.util.concurrent.CompletableFuture;

/**
* @author puhaiyang
* @since 2023/3/30 20:01
* MongodbWatchTestMain
*/
public class MongodbWatchTestMain {

public static void main(String[] args) throws Exception {
String uri = \”mongodb://admin:123456@192.168.1.11:27017,192.168.1.12:27017/?replicaSet=haiyangReplset\”;
MongoClient mongoClient = MongoClients.create(uri);
MongoDatabase mongoDatabase = mongoClient.getDatabase(\”my-test-db\”);
String myTestCollectionName = \”myTestCollection\”;
//获取出collection
MongoCollection<Document> mongoCollection = initCollection(mongoDatabase, myTestCollectionName);
//进行watch
CompletableFuture.runAsync(() -> {
while (true) {
List<Bson> pipeline = Lists.newArrayList(
Aggregates.match(Filters.in(\”ns.coll\”, myTestCollectionName)),
Aggregates.match(Filters.in(\”operationType\”, Arrays.asList(\”insert\”, \”update\”, \”replace\”, \”delete\”)))
);
ChangeStreamIterable<Document> changeStream = mongoDatabase.watch(pipeline)
.fullDocument(FullDocument.UPDATE_LOOKUP)
.fullDocumentBeforeChange(FullDocumentBeforeChange.WHEN_AVAILABLE);

changeStream.forEach(event -> {
String collectionName = Objects.requireNonNull(event.getNamespace()).getCollectionName();
System.out.println(\”——–> event:\” + event.toString());
});
}
});

//数据变更测试
{
Thread.sleep(3_000);
InsertOneResult insertResult = mongoCollection.insertOne(new Document(\”test\”, \”sample movie document\”));
System.out.println(\”Success! Inserted document id: \” + insertResult.getInsertedId());
UpdateResult updateResult = mongoCollection.updateOne(new Document(\”test\”, \”sample movie document\”), Updates.set(\”field2\”, \”sample movie document update\”));
System.out.println(\”Updated \” + updateResult.getModifiedCount() + \” document.\”);
DeleteResult deleteResult = mongoCollection.deleteOne(new Document(\”field2\”, \”sample movie document update\”));
System.out.println(\”Deleted \” + deleteResult.getDeletedCount() + \” document.\”);
}

new Scanner(System.in).next();
}

private static MongoCollection<Document> initCollection(MongoDatabase mongoDatabase, String myTestCollectionName) {
ArrayList<Document> existsCollections = mongoDatabase.listCollections().into(new ArrayList<>());
Optional<Document> existsCollInfoOpl = existsCollections.stream().filter(doc -> StringUtils.equals(myTestCollectionName, doc.getString(\”name\”))).findFirst();
existsCollInfoOpl.ifPresent(collInfo -> {
//确保开启了changeStreamPreAndPost
Document changeStreamPreAndPostImagesEnable = collInfo.get(\”options\”, Document.class).get(\”changeStreamPreAndPostImages\”, Document.class);
if (changeStreamPreAndPostImagesEnable != null && !changeStreamPreAndPostImagesEnable.getBoolean(\”enabled\”)) {
Document mod = new Document();
mod.put(\”collMod\”, myTestCollectionName);
mod.put(\”changeStreamPreAndPostImages\”, new Document(\”enabled\”, true));
mongoDatabase.runCommand(mod);
}
});
if (!existsCollInfoOpl.isPresent()) {
CreateCollectionOptions collectionOptions = new CreateCollectionOptions();
//创建collection时开启ChangeStreamPreAndPostImages
collectionOptions.changeStreamPreAndPostImagesOptions(new ChangeStreamPreAndPostImagesOptions(true));
mongoDatabase.createCollection(myTestCollectionName, collectionOptions);
}
return mongoDatabase.getCollection(myTestCollectionName);
}
}

输出结果如下：

——–> event:ChangeStreamDocument{ operationType=insert, resumeToken={"_data": "8264255A0F000000022B022C0100296E5A10046A3E3757D6A64DF59E6D94DC56A9210446645F6964006464255A105A91F005CFB2E6D20004"}, namespace=my-test-db.myTestCollection, destinationNamespace=null, fullDocument=Document{{_id=64255a105a91f005cfb2e6d2, test=sample movie document}}, fullDocumentBeforeChange=null, documentKey={"_id": {"$oid": "64255a105a91f005cfb2e6d2"}}, clusterTime=Timestamp{value=7216272998402097154, seconds=1680169487, inc=2}, updateDescription=null, txnNumber=null, lsid=null, wallTime=BsonDateTime{value=1680169487686}}Success! Inserted document id: BsonObjectId{value=64255a105a91f005cfb2e6d2}Updated 1 document.——–> event:ChangeStreamDocument{ operationType=update, resumeToken={"_data": "8264255A0F000000032B022C0100296E5A10046A3E3757D6A64DF59E6D94DC56A9210446645F6964006464255A105A91F005CFB2E6D20004"}, namespace=my-test-db.myTestCollection, destinationNamespace=null, fullDocument=Document{{_id=64255a105a91f005cfb2e6d2, test=sample movie document, field2=sample movie document update}}, fullDocumentBeforeChange=Document{{_id=64255a105a91f005cfb2e6d2, test=sample movie document}}, documentKey={"_id": {"$oid": "64255a105a91f005cfb2e6d2"}}, clusterTime=Timestamp{value=7216272998402097155, seconds=1680169487, inc=3}, updateDescription=UpdateDescription{removedFields=[], updatedFields={"field2": "sample movie document update"}, truncatedArrays=[], disambiguatedPaths=null}, txnNumber=null, lsid=null, wallTime=BsonDateTime{value=1680169487708}}——–> event:ChangeStreamDocument{ operationType=delete, resumeToken={"_data": "8264255A0F000000042B022C0100296E5A10046A3E3757D6A64DF59E6D94DC56A9210446645F6964006464255A105A91F005CFB2E6D20004"}, namespace=my-test-db.myTestCollection, destinationNamespace=null, fullDocument=null, fullDocumentBeforeChange=Document{{_id=64255a105a91f005cfb2e6d2, test=sample movie document, field2=sample movie document update}}, documentKey={"_id": {"$oid": "64255a105a91f005cfb2e6d2"}}, clusterTime=Timestamp{value=7216272998402097156, seconds=1680169487, inc=4}, updateDescription=null, txnNumber=null, lsid=null, wallTime=BsonDateTime{value=1680169487721}}Deleted 1 document.

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