配置MongoDB群集

我应该为mongodb集群配置两个节点。每个节点都应该复制所有数据。如果一个服务器死了,那么另一个应该假定为主服务器。

在我配置集群之前,我正在使用Docker实例进行本地测试来配置它。 As I saw in the documentation ,我应该至少有3个MongoDB实例。是这样吗?

首先我用docker创建了树实例,我将实例一配置为主实例。下面的代码是我的docker编写和配置脚本。

码头工人组成:

version: '3'
services:
    mongo-2:
        container_name: mongo-2
        image: mongo:4
        ports:
            - 30102:27017
        command: mongod --replSet cnf-serv --port 27017 --oplogSize 16 --bind_ip_all
        restart: always

    mongo-3:
        container_name: mongo-3
        image: mongo:4
        ports:
            - 30103:27017
        command: mongod --replSet cnf-serv --port 27017 --oplogSize 16 --bind_ip_all
        restart: always 

    mongo-1:
        container_name: mongo-1
        image: mongo:4
        ports:
            - 30101:27017
        command: mongod --replSet cnf-serv --port 27017 --oplogSize 16 --bind_ip_all
        links:
            - mongo-2:mongo-2
            - mongo-3:mongo-3
        restart: always

    mongo-setup:
        container_name: mongo-setup
        image: mongo:4
        depends_on:
            - mongo-1
            - mongo-2
            - mongo-3
        links:
            - mongo-1:mongo-1
            - mongo-2:mongo-2
            - mongo-3:mongo-3
        volumes:
            - ./scripts:/scripts
        environment: 
            - MONGO1=mongo-1
            - MONGO2=mongo-2
            - MONGO3=mongo-3
            - RS=cnf-serv
            - PORT=27017
        entrypoint: [ "/scripts/setup.sh" ]

配置脚本:

#!/bin/bash 

mongodb1=`getent hosts ${MONGO1} | awk '{ print $1 }'`
mongodb2=`getent hosts ${MONGO2} | awk '{ print $1 }'`
mongodb3=`getent hosts ${MONGO3} | awk '{ print $1 }'`

port=${PORT:-27017}

echo "Waiting for startup.."
until mongo --host ${mongodb1}:${port} --eval 'quit(db.runCommand({ ping: 1 }).ok ? 0 : 2)' &>/dev/null; do
printf '.'
sleep 1
done

echo "Started.."

echo setup.sh time now: `date +"%T" `
mongo --host ${mongodb1}:${port} <<EOF
var cfg = {
        "_id": "${RS}",
        "protocolVersion": 1,
        "members": [
            {
                "_id": 100,
                "host": "${mongodb1}:${port}"
            },
            {
                "_id": 101,
                "host": "${mongodb2}:${port}"
            },
            {
                "_id": 102,
                "host": "${mongodb3}:${port}"
            }
        ]
    };
    rs.initiate(cfg, { force: true });
    rs.reconfig(cfg, { force: true });
EOF

当我尝试在任何外部容器端口中连接时,都会收到相同的错误消息: Could not connect to MongoDB on the provided host and port

如何使用DOCKER配置内部集群?