mongodb 安装经常使用命令 集群架构 调整，增长延迟备份节点服务器，删除仲裁节点

[mongo@ms3 bin]$ ./mongo -port 27011
rs.remove("192.168.0.19:27013");
rs.add({_id: 2, host:'192.168.0.21:27012',"slaveDelay":36000,"priority":0,"hidden":true,"buildIndexes":true});

先建立相应的文件夹
./mongod --dbpath ../data1 --logpath ../log1/log1.log --port 20001 --fork --replSet myrepl  
./mongod --dbpath ../data2 --logpath ../log2/log2.log --port 20002 --fork --replSet myrepl  
./mongod --dbpath ../data3 --logpath ../log3/log3.log --port 20003 --fork --replSet myrepl  

rs.initiate({_id:"myrepl",members:[{_id:0,host:'127.0.0.1:20001'},{_id:1,host:'127.0.0.1:20002'},{_id:2,host:'127.0.0.1:20003'}]})

1：建立副本集，这个前面学过，就是启动全部的成员服务器后，使用rs.initiate命令
2：修改副本集成员，前面也学过一些，好比rs.add()，rs.remove()命令，还能够使用
rs.reconfig(config)命令，好比修改第一个成员的host名称，示例以下：
var config = rs.config();
config.members[0].host=“newHost:port”;
rs.reconfig(config);
-----------------------------------------------------------------------------------
./mongod --configsvr --dbpath ../confdb/confdb1 --logpath ../conflog/conflog1 --fork --port 30001
./mongod --configsvr --dbpath ../confdb/confdb2 --logpath ../conflog/conflog2 --fork --port 30002
./mongod --configsvr --dbpath ../confdb/confdb3 --logpath ../conflog/conflog3 --fork --port 30003

./mongos --configdb 127.0.0.1:30001,127.0.0.1:30002,127.0.0.1:30003 --logpath ../conflog/mongoslog --fork

sh.addShard("myrep2/127.0.0.1:20004");

for(var i=0;i++;i<10000){db.tuser.insert({"uname":"liuwe"+i});};

./mongod --dbpath ../data4 --logpath ../log4 --port 20004 --fork --replSet myrep2  
./mongod --dbpath ../data5 --logpath ../log5 --port 20005 --fork --replSet myrep2 
./mongod --dbpath ../data6 --logpath ../log6 --port 20006 --fork --replSet myrep2 
rs.initiate({_id:"myrep2",members:[{_id:0,host:'127.0.0.1:20004'},{_id:1,host:'127.0.0.1:20005'},{_id:2,host:'127.0.0.1:20006'}]})

-------------------------------------------------------------------------------------------------
> db.users.explain("allPlansExecution").find({username:'user101'})
{
    "queryPlanner" : {
        "plannerVersion" : 1,
        "namespace" : "test.users",
        "indexFilterSet" : false,
        "parsedQuery" : {
            "username" : {
                "$eq" : "user101"
            }
        },
        "winningPlan" : {
            "stage" : "FETCH",
            "inputStage" : {
                "stage" : "IXSCAN",
                "keyPattern" : {
                    "username" : 1
                },
                "indexName" : "username_1",
                "isMultiKey" : false,
                "direction" : "forward",
                "indexBounds" : {
                    "username" : [
                        "[\"user101\", \"user101\"]"
                    ]
                }
            }
        },
        "rejectedPlans" : [ ]
    },
    "executionStats" : {
        "executionSuccess" : true,
        "nReturned" : 1,
        "executionTimeMillis" : 0,
        "totalKeysExamined" : 1,
        "totalDocsExamined" : 1,
        "executionStages" : {
            "stage" : "FETCH",
            "nReturned" : 1,
            "executionTimeMillisEstimate" : 0,
            "works" : 2,
            "advanced" : 1,
            "needTime" : 0,
            "needFetch" : 0,
            "saveState" : 0,
            "restoreState" : 0,
            "isEOF" : 1,
            "invalidates" : 0,
            "docsExamined" : 1,
            "alreadyHasObj" : 0,
            "inputStage" : {
                "stage" : "IXSCAN",
                "nReturned" : 1,
                "executionTimeMillisEstimate" : 0,
                "works" : 2,
                "advanced" : 1,
                "needTime" : 0,
                "needFetch" : 0,
                "saveState" : 0,
                "restoreState" : 0,
                "isEOF" : 1,
                "invalidates" : 0,
                "keyPattern" : {
                    "username" : 1
                },
                "indexName" : "username_1",
                "isMultiKey" : false,
                "direction" : "forward",
                "indexBounds" : {
                    "username" : [
                        "[\"user101\", \"user101\"]"
                    ]
                },
                "keysExamined" : 1,
                "dupsTested" : 0,
                "dupsDropped" : 0,
                "seenInvalidated" : 0,
                "matchTested" : 0
            }
        },
        "allPlansExecution" : [ ]
    },
    "serverInfo" : {
        "host" : "mongo2",
        "port" : 27017,
        "version" : "3.0.0",
        "gitVersion" : "a841fd6394365954886924a35076691b4d149168"
    },
    "ok" : 1
}

建立比较大的副本集
副本集最多只能拥有12个成员，只有7个成员拥有投票权。所以要建立超过7个副本
集的话，须要将其余成员的投票权设置为0，例如：
rs.add({“_id”:8,”host”:”localhost:20008”,”votes”:0});
若是要配置超过12个成员的话，须要使用Master/Slave的方式，不过这个方式已经

不建议使用了，若是未来副本集能支持更多成员的话，这个方式可能会当即废除。
 强制从新配置
若是副本集没法达到“大多数”要求的话，可能会没法选出主节点，这个时候，可
以shell链接任意一个成员，而后使用force选项强制从新配置，示例以下：

rs.reconfig(config,{“force”:true});

---------------------------------------常见问题------------------------------------------------------------

rs.initiate({_id:"myrepl",members:[{_id:0,host:'10.1.10.76:20001'},{_id:1,host:'10.1.10.76:20002'},{_id:2,host:'10.1.10.76:20003'}]})这个地方最好写IP地址不要写127.0.0.1

不然spring-data-mongodb 链接不上