mongodb创建副本集

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本文介绍了如何通过创建多个数据目录文件夹并启动独立的mongod进程来搭建MongoDB副本集。文中详细展示了初始化配置、添加节点及仲裁节点的过程，并提供了运行状态查看的示例。

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连接mongodb的命令

mongo 127.0.0.1:40000

一、创建多个mongodb数据目录文件夹

node1

node2

node3

arbiter

二、副本集启动独立的mongod

mongod --replSet myapp --dbpath=node1 --port=40000
mongod --replSet myapp --dbpath=node2 --port=40001
mongod --replSet myapp --dbpath=node3 --port=40002
mongod --replSet myapp --dbpath=arbiter --port=40003

三、初始化配置

连接node1，直接使用默认的配置初始化

rs.initiate()

初始化成功返回

{
    "info" : "Config now saved locally.  Should come online in about a minute.",
    "me" : "liu-PC:40000",
    "ok" : 1
}

四、添加节点

rs.add("host:port")

五、添加仲裁节点

rs.add("host:port",{arbiterOnly:true})

六、查看运行状态

rs.status()

{
    "set" : "myapp",
    "date" : ISODate("2017-10-19T09:45:19.699Z"),
    "myState" : 2,
    "term" : NumberLong(4),
    "syncingTo" : "liu-PC:40001",
    "heartbeatIntervalMillis" : NumberLong(2000),
    "optimes" : {
        "lastCommittedOpTime" : {
            "ts" : Timestamp(0, 0),
            "t" : NumberLong(-1)
        },
        "appliedOpTime" : {
            "ts" : Timestamp(1508406311, 1),
            "t" : NumberLong(4)
        },
        "durableOpTime" : {
            "ts" : Timestamp(1508406311, 1),
            "t" : NumberLong(4)
        }
    },
    "members" : [
        {
            "_id" : 0,
            "name" : "liu-PC:40000",
            "health" : 1,
            "state" : 2,
            "stateStr" : "SECONDARY",
            "uptime" : 442,
            "optime" : {
                "ts" : Timestamp(1508406311, 1),
                "t" : NumberLong(4)
            },
            "optimeDate" : ISODate("2017-10-19T09:45:11Z"),
            "syncingTo" : "liu-PC:40001",
            "configVersion" : 4,
            "self" : true
        },
        {
            "_id" : 1,
            "name" : "liu-PC:40001",
            "health" : 1,
            "state" : 1,
            "stateStr" : "PRIMARY",
            "uptime" : 31,
            "optime" : {
                "ts" : Timestamp(1508406311, 1),
                "t" : NumberLong(4)
            },
            "optimeDurable" : {
                "ts" : Timestamp(1508406311, 1),
                "t" : NumberLong(4)
            },
            "optimeDate" : ISODate("2017-10-19T09:45:11Z"),
            "optimeDurableDate" : ISODate("2017-10-19T09:45:11Z"),
            "lastHeartbeat" : ISODate("2017-10-19T09:45:18.106Z"),
            "lastHeartbeatRecv" : ISODate("2017-10-19T09:45:17.758Z"),
            "pingMs" : NumberLong(0),
            "electionTime" : Timestamp(1508406307, 1),
            "electionDate" : ISODate("2017-10-19T09:45:07Z"),
            "configVersion" : 4
        },
        {
            "_id" : 2,
            "name" : "liu-PC:40002",
            "health" : 1,
            "state" : 2,
            "stateStr" : "SECONDARY",
            "uptime" : 13,
            "optime" : {
                "ts" : Timestamp(1508405846, 1),
                "t" : NumberLong(3)
            },
            "optimeDurable" : {
                "ts" : Timestamp(1508405846, 1),
                "t" : NumberLong(3)
            },
            "optimeDate" : ISODate("2017-10-19T09:37:26Z"),
            "optimeDurableDate" : ISODate("2017-10-19T09:37:26Z"),
            "lastHeartbeat" : ISODate("2017-10-19T09:45:18.270Z"),
            "lastHeartbeatRecv" : ISODate("2017-10-19T09:45:19.277Z"),
            "pingMs" : NumberLong(0),
            "configVersion" : 4
        },
        {
            "_id" : 3,
            "name" : "liu-PC:40003",
            "health" : 0,
            "state" : 8,
            "stateStr" : "(not reachable/healthy)",
            "uptime" : 0,
            "lastHeartbeat" : ISODate("2017-10-19T09:45:13.107Z"),
            "lastHeartbeatRecv" : ISODate("2017-10-19T09:45:19.621Z"),
            "pingMs" : NumberLong(0),
            "lastHeartbeatMessage" : "Couldn't get a connection within the time limit",
            "configVersion" : -1
        }
    ],
    "ok" : 1
}