基于Docker搭建MongoDB集群

今天要帮公司搭建一个MongoDB的集群，记录一下搭建的过程。

Ubuntu 18.04.1 LTS

安装Docker

sudo apt install -y docker.io

安装完毕，查看一下Docker版本：

dafengge0913@ubuntu:~$ docker -v
Docker version 18.06.1-ce, build e68fc7a

拉取MongoDB镜像

sudo docker pull mongo

查看镜像：

dafengge0913@ubuntu:~$ sudo docker images mongo
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
mongo               latest              525bd2016729        4 weeks ago         383MB

使用Docker启动MongoDB

sudo docker run -p 27017:27017 -v $PWD/db:/data/db -d mongo:latest

查看运行状态：

dafengge0913@ubuntu:~/mongo$ sudo docker ps -a --no-trunc
CONTAINER ID                                                       IMAGE               COMMAND                         CREATED             STATUS              PORTS                      NAMES
bd27d09493c1fd663014410bf1cdf7227326cccb28733738311aa1cfc0cb7647   mongo:latest        "docker-entrypoint.sh mongod"   23 seconds ago      Up 22 seconds       0.0.0.0:27017->27017/tcp   distracted_snyder

连接容器中的MongoDB：

sudo docker run -it mongo:latest mongo --host 172.17.0.1

搭建副本集和集群

集群包含两组分片副本集
每个副本集一个主节点、一个从节点、一个仲裁节点
配置副本集包含三个节点
使用一个mongos路由

为了方便 写一个启动脚本

#!/bin/sh
sudo docker run -p 27001:27018 -v $PWD/db1:/data/db -d mongo:latest --shardsvr --replSet rs1 --port 27018 --bind_ip 0.0.0.0
sudo docker run -p 27002:27018 -v $PWD/db2:/data/db -d mongo:latest --shardsvr --replSet rs1 --port 27018 --bind_ip 0.0.0.0
sudo docker run -p 27003:27018 -v $PWD/db3:/data/db -d mongo:latest --shardsvr --replSet rs1 --port 27018 --bind_ip 0.0.0.0
sudo docker run -p 27004:27018 -v $PWD/db4:/data/db -d mongo:latest --shardsvr --replSet rs2 --port 27018 --bind_ip 0.0.0.0
sudo docker run -p 27005:27018 -v $PWD/db5:/data/db -d mongo:latest --shardsvr --replSet rs2 --port 27018 --bind_ip 0.0.0.0
sudo docker run -p 27006:27018 -v $PWD/db6:/data/db -d mongo:latest --shardsvr --replSet rs2 --port 27018 --bind_ip 0.0.0.0
sudo docker run -p 27007:27018 -v $PWD/db_config_1:/data/db -d mongo:latest --configsvr --dbpath /data/db --replSet rsc --port 27018 --bind_ip 0.0.0.0
sudo docker run -p 27008:27018 -v $PWD/db_config_2:/data/db -d mongo:latest --configsvr --dbpath /data/db --replSet rsc --port 27018 --bind_ip 0.0.0.0
sudo docker run -p 27009:27018 -v $PWD/db_config_3:/data/db -d mongo:latest --configsvr --dbpath /data/db --replSet rsc --port 27018 --bind_ip 0.0.0.0
sudo docker run -p 27100:27018 -v $PWD/db_mongos_1:/data/db -d mongo:latest mongos --port 27018 --configdb rsc/172.17.0.1:27007,172.17.0.1:27008,172.17.0.1:27008 --bind_ip 0.0.0.0

初始化副本集rs1

sudo docker run -it mongo:latest mongo --host 172.17.0.1 --port 27001

> use admin
switched to db admin
> config = {_id:"rs1",members:[{_id:0,host:"172.17.0.1:27001"},{_id:1,host:"172.17.0.1:27002"},{_id:2,host:"172.17.0.1:27003",arbiterOnly:true}]}
{
	"_id" : "rs1",
	"members" : [
		{
			"_id" : 0,
			"host" : "172.17.0.1:27001"
		},
		{
			"_id" : 1,
			"host" : "172.17.0.1:27002"
		},
		{
			"_id" : 2,
			"host" : "172.17.0.1:27003",
			"arbiterOnly" : true
		}
	]
}

> rs.initiate(config)
{
	"ok" : 1,
	"operationTime" : Timestamp(1545715075, 1),
	"$clusterTime" : {
		"clusterTime" : Timestamp(1545715075, 1),
		"signature" : {
			"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
			"keyId" : NumberLong(0)
		}
	}
}

初始化副本集rs2

sudo docker run -it mongo:latest mongo --host 172.17.0.1 --port 27004

> use admin
> config = {_id:"rs2",members:[{_id:0,host:"172.17.0.1:27004"},{_id:1,host:"172.17.0.1:27005"},{_id:2,host:"172.17.0.1:27006",arbiterOnly:true}]}
> rs.initiate(config)

初始化配置副本集

sudo docker run -it mongo:latest mongo --host 172.17.0.1 --port 27007

> use admin
> config = {_id:"rsc",members:[{_id:0,host:"172.17.0.1:27007"}, {_id:1,host:"172.17.0.1:27008"},{_id:2,host:"172.17.0.1:27009"}]}
> rs.initiate(config)

通过mongos添加分片关系到configsvr

sudo docker run -it mongo:latest mongo --host 172.17.0.1 --port 27100

mongos> use admin
switched to db admin
mongos> db.runCommand({addshard:"rs1/172.17.0.1:27001,172.17.0.1:27002,172.17.0.1:27003"})
{
	"shardAdded" : "rs1",
	"ok" : 1,
	"operationTime" : Timestamp(1545719532, 6),
	"$clusterTime" : {
		"clusterTime" : Timestamp(1545719532, 6),
		"signature" : {
			"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
			"keyId" : NumberLong(0)
		}
	}
}
mongos> db.runCommand({addshard:"rs2/172.17.0.1:27004,172.17.0.1:27005,172.17.0.1:27006"})
{
	"shardAdded" : "rs2",
	"ok" : 1,
	"operationTime" : Timestamp(1545719538, 5),
	"$clusterTime" : {
		"clusterTime" : Timestamp(1545719538, 5),
		"signature" : {
			"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
			"keyId" : NumberLong(0)
		}
	}
}
mongos> 

写一个停止用的脚本：

#!/bin/sh
sudo docker stop $(sudo docker ps -a | grep mongo | grep Up | awk '{print $1}')