MongoDB设置 Replication Sets-linunx运维专题
MongoDB 高可用可用分两种 ：Master-Slave 主从复制 ：只需要在某一个服务启动时加上–master 参数, 而另一个服务加上–slave 与–source 参数, 即可实现同步。
MongoDB的最新版本已不再推荐此方案。
Replica Sets 复制集 ：MongoDB 在 1.6 版本对开发了新功能 replica set,这比之前的 replication 功能要强大一 些,增加了故障自动切换
和自动修复成员节点,各个 DB 之间数据完全一致,大大降低了维 护成功。auto shard 已经明确说明不支持 replication paris,建议使用
replica set,replica set 故障切换完全自动。
Replica Sets 的结构非常类似一个集群 ，其中一个节点如果出现故障, 其它节点马上会将业务 接过来而无须停机操作。
192.168.110.131(node1)
192.168.110.132(node2)
192.168.110.133(node3)
官方文档：
http://docs.mongoing.com/manual-zh/
部署复制集：
http://docs.mongoing.com/manual-zh/tutorial/deploy-replica-set.html
一、MongoDB安装
# vim /etc/yum.repos.d/Mongodb.repo
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.4/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-3.4.asc
# yum install -y mongodb-org
# service mongod start
Starting mongod:
# ps aux|grep mong
mongod 13615.7 14.8 351180 35104 ? Sl 01:26 0:01 /usr/bin/mongod -f /etc/mongod.conf
更改数据存放目录：
# mkdir -p /mongodb/data
# chown -R mongod:mongod /mongodb/
# ll /mongodb/
total 4
drwxr-xr-x 2 mongod mongod 4096 May 18 02:04 data
# grep -v "^#" /etc/mongod.conf |grep -v "^$"
systemLog:
destination: file
logAppend: true
path: /var/log/mongodb/mongod.log
storage:
dbPath: /mongodb/data
journal:
enabled: true
processManagement:
fork: true# fork and run in background
pidFilePath: /var/run/mongodb/mongod.pid# location of pidfile
net:
port: 27017
bindIp: 0.0.0.0 # Listen to local interface only, comment to listen on all interfaces.
# service mongod start
Starting mongod:
node2，node2与上面一样
二、配置 Replication Sets
介绍一下涉及到的参数
--oplogSize 日志操作文件的大小
--dbpath 数据文件路径
--logpath日志文件路径
--port 端口号，默认是27017.我这里使用的也是这个端口号.
--replSet 复制集的名字，一个replica sets中的每个节点的这个参数都要用一个复制集名字，这里是test.
--replSet test/这个后面跟的是其他standard节点的ip和端口
--maxConns 最大连接数
--fork 后台运行
--logappend 日志文件循环使用，如果日志文件已满，那么新日志覆盖最久日志。
--keyFile 标识同一集群的认证私钥
其中在启动节点时一定要加上oplogSize 的参数 为其设置大小，不然在64位操作系统上的mongodb,oplogs都相当大-可能是5%的磁盘空间。
要根据情况设置个合理的值。
v3.4.4上的参数：
# vim /etc/mongod.conf
replication:
oplogSizeMB: 1024
replSetName: rs0
使用Keyfile存取控制部署复制集：
openssl rand -base64 756 >
chmod 400
Configuration File
If using a configuration file, set the security.keyFile option to the keyfile’s path, and the replication.replSetName option to the replica set name:
security:
keyFile:
replication:
replSetName:
Command Line
If using the command line option, start the mongod with the --keyFile and --replSet parameters:
mongod --keyFile--replSet
配置带密钥文件的 Replication Sets：
# openssl rand -base64 756 > /mongodb/mongokey
# cat /mongodb/mongokey
gxpcgjyFj2qE8b9TB/0XbdRVYH9VDb55NY03AHwxCFU58MUjJMeez844i1gaUo/t
.....
.....
# chmod 400 /mongodb/mongokey
# chown mongod:mongod /mongodb/mongokey
# ll /mongodb/
total 8
drwxr-xr-x 4 mongod mongod 4096 May 19 18:39 data
-r-------- 1 mongod mongod 1024 May 19 18:29 mongokey
# vim /etc/mongod.conf
#security:
security:
keyFile: /mongodb/mongokey
#operationProfiling:
#replication:
replication:
oplogSizeMB: 1024
replSetName: rs0
# service mongod restart
Stopping mongod:
Starting mongod:
# iptables -I INPUT 4 -m state --state NEW -p tcp --dport 27017-j ACCEPT
复制hosts文件：
# rsync -avH --progress '-e ssh -p 22' /etc/hosts root@node2.pancou.com:/mongodb/
# rsync -avH --progress '-e ssh -p 22' /etc/hosts root@node3.pancou.com:/mongodb/
复制密钥文件：
# rsync -avH --progress '-e ssh -p 22' /mongodb/mongokey root@node3.pancou.com:/mongodb/
# rsync -avH --progress '-e ssh -p 22' /mongodb/mongokey root@node3.pancou.com:/mongodb/
复制配置文件：
# rsync -avH --progress '-e ssh -p 22' /etc/mongod.conf root@node2.pancou.com:/etc/
# rsync -avH --progress '-e ssh -p 22' /etc/mongod.conf root@node3.pancou.com:/etc/
注意:双方都要按照rsync和openssh-clients
# mongo
> help
db.help() help on db methods
db.mycoll.help() help on collection methods
sh.help() sharding helpers
rs.help() replica set helpers
.....
> rs.help()
rs.status() { replSetGetStatus : 1 } checks repl set status
rs.initiate() { replSetInitiate : null } initiates set with default settings
rs.initiate(cfg) { replSetInitiate : cfg } initiates set with configuration cfg
rs.conf() get the current configuration object from local.system.replset
.....
> rs.status()
{
"info" : "run rs.initiate(...) if not yet done for the set",
"ok" : 0,
"errmsg" : "no replset config has been received",
"code" : 94,
"codeName" : "NotYetInitialized"
}
> rs.initiate()
{
"info2" : "no configuration specified. Using a default configuration for the set",
"me" : "node1.pancou.com:27017",
"ok" : 1
}
rs0:OTHER>
rs0:PRIMARY> rs.status()
{
"set" : "rs0",
"date" : ISODate("2017-05-18T17:00:49.868Z"),
"myState" : 1,
"term" : NumberLong(1),
"heartbeatIntervalMillis" : NumberLong(2000),
"optimes" : {
"lastCommittedOpTime" : {
"ts" : Timestamp(1495126845, 1),
"t" : NumberLong(1)
},
"appliedOpTime" : {
"ts" : Timestamp(1495126845, 1),
"t" : NumberLong(1)
},
"durableOpTime" : {
"ts" : Timestamp(1495126845, 1),
"t" : NumberLong(1)
}
},
"members" : [
{
"_id" : 0,
"name" : "node1.pancou.com:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 1239,
"optime" : {
"ts" : Timestamp(1495126845, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2017-05-18T17:00:45Z"),
"infoMessage" : "could not find member to sync from",
"electionTime" : Timestamp(1495126824, 2),
"electionDate" : ISODate("2017-05-18T17:00:24Z"),
"configVersion" : 1,
"self" : true
}
],
"ok" : 1
}
rs0:PRIMARY> rs.add("node2.pancou.com")
{ "ok" : 1 }
rs0:PRIMARY> rs.add("node3.pancou.com")
{ "ok" : 1 }
rs0:PRIMARY> rs.status()
{
"set" : "rs0",
"date" : ISODate("2017-05-18T17:08:47.724Z"),
"myState" : 1,
"term" : NumberLong(1),
"heartbeatIntervalMillis" : NumberLong(2000),
"optimes" : {
"lastCommittedOpTime" : {
"ts" : Timestamp(1495127325, 1),
"t" : NumberLong(1)
},
"appliedOpTime" : {
"ts" : Timestamp(1495127325, 1),
"t" : NumberLong(1)
},
"durableOpTime" : {
"ts" : Timestamp(1495127325, 1),
"t" : NumberLong(1)
}
},
"members" : [
{
"_id" : 0,
"name" : "node1.pancou.com:27017",
"health" : 1, //表明状态正常
"state" : 1, //1表示是PRIMARY，2表示是slave
"stateStr" : "PRIMARY", //表示此机器是主库
"uptime" : 1717,
"optime" : {
"ts" : Timestamp(1495127325, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2017-05-18T17:08:45Z"),
"electionTime" : Timestamp(1495126824, 2),
"electionDate" : ISODate("2017-05-18T17:00:24Z"),
"configVersion" : 3,
"self" : true
},
{
"_id" : 1,
"name" : "node2.pancou.com:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 64,
"optime" : {
"ts" : Timestamp(1495127325, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1495127325, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2017-05-18T17:08:45Z"),
"optimeDurableDate" : ISODate("2017-05-18T17:08:45Z"),
"lastHeartbeat" : ISODate("2017-05-18T17:08:46.106Z"),
"lastHeartbeatRecv" : ISODate("2017-05-18T17:08:47.141Z"),
"pingMs" : NumberLong(0),
"syncingTo" : "node1.pancou.com:27017",
"configVersion" : 3
},
{
"_id" : 2,
"name" : "node3.pancou.com:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 55,
"optime" : {
"ts" : Timestamp(1495127325, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1495127325, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2017-05-18T17:08:45Z"),
"optimeDurableDate" : ISODate("2017-05-18T17:08:45Z"),
"lastHeartbeat" : ISODate("2017-05-18T17:08:46.195Z"),
"lastHeartbeatRecv" : ISODate("2017-05-18T17:08:46.924Z"),
"pingMs" : NumberLong(0),
"syncingTo" : "node2.pancou.com:27017",
"configVersion" : 3
}
],
"ok" : 1
}
rs0:PRIMARY> db.isMaster()
{
"hosts" : [
"node1.pancou.com:27017",
"node2.pancou.com:27017",
"node3.pancou.com:27017"
],
"setName" : "rs0",
"setVersion" : 3,
"ismaster" : true,
"secondary" : false,
"primary" : "node1.pancou.com:27017",
"me" : "node1.pancou.com:27017",
"electionId" : ObjectId("7fffffff0000000000000001"),
"lastWrite" : {
"opTime" : {
"ts" : Timestamp(1495127705, 1),
"t" : NumberLong(1)
},
"lastWriteDate" : ISODate("2017-05-18T17:15:05Z")
},
"maxBsonObjectSize" : 16777216,
"maxMessageSizeBytes" : 48000000,
"maxWriteBatchSize" : 1000,
"localTime" : ISODate("2017-05-18T17:15:11.146Z"),
"maxWireVersion" : 5,
"minWireVersion" : 0,
"readOnly" : false,
"ok" : 1
}
rs0:PRIMARY> use testdb
rs0:PRIMARY> show collections
testcoll
rs0:PRIMARY> db.testcoll.find()
{ "_id" : ObjectId("591dd9f965cc255a5373aefa"), "name" : "tom", "age" : 25 }
到从库上查看：
node2:
rs0:SECONDARY> rs.slaveOk()
rs0:SECONDARY> show dbs
admin 0.000GB
local 0.000GB
testdb0.000GB
rs0:SECONDARY> use testdb
switched to db testdb
rs0:SECONDARY> show collections
testcoll
rs0:SECONDARY> db.testcoll.find()
{ "_id" : ObjectId("591dd9f965cc255a5373aefa"), "name" : "tom", "age" : 25 }
rs0:SECONDARY>
node3:
rs0:SECONDARY> rs.slaveOk()
rs0:SECONDARY> show dbs
admin 0.000GB
local 0.000GB
testdb0.000GB
rs0:SECONDARY> use testdb
switched to db testdb
rs0:SECONDARY> show collections
testcoll
rs0:SECONDARY> db.testcoll.find()
{ "_id" : ObjectId("591dd9f965cc255a5373aefa"), "name" : "tom", "age" : 25 }
rs0:SECONDARY>
主从操作日志
rs0:PRIMARY> use local
switched to db local
rs0:PRIMARY> show collections
me
oplog.rs
replset.election
replset.minvalid
startup_log
system.replset
rs0:PRIMARY> db.oplog.rs.find()
{ "ts" : Timestamp(1495126824, 1), "h" : NumberLong("3056083863196084673"), "v" : 2, "op" : "n", "ns" : "", "o" : { "msg" : "initiating set" } }
{ "ts" : Timestamp(1495126825, 1), "t" : NumberLong(1), "h" : NumberLong("7195178065440751511"), "v" : 2, "op" : "n", "ns" : "", "o" : { "msg" : "new primary" } }
{ "ts" : Timestamp(1495126835, 1), "t" : NumberLong(1), "h" : NumberLong("5723995478292318850"), "v" : 2, "op" : "n", "ns" : "", "o" : { "msg" : "periodic noop" } }
{ "ts" : Timestamp(1495126845, 1), "t" : NumberLong(1), "h" : NumberLong("-3772304067699003381"), "v" : 2, "op" : "n", "ns" : "", "o"
三、查看配置信息
rs0:PRIMARY> db.printReplicationInfo()
configured oplog> log length start to end: 2541secs (0.71hrs)
oplog first event time:Fri May 19 2017 01:00:24 GMT+0800 (CST)
oplog last event time: Fri May 19 2017 01:42:45 GMT+0800 (CST)
now: Fri May 19 2017 01:42:48 GMT+0800 (CST)
rs0:PRIMARY>
db.oplog.rs.find()：查看复制集产生的日志
db.printReplicationInfo()：查看操作日志的一些基本信息，如日志大小、日志启用时间。
db.printSlaveReplicationInfo()：查看所有slave延迟情况。
rs0:PRIMARY> db.printSlaveReplicationInfo()
source: node2.pancou.com:27017
syncedTo: Fri May 19 2017 01:47:15 GMT+0800 (CST)
0 secs (0 hrs) behind the primary
source: node3.pancou.com:27017
syncedTo: Fri May 19 2017 01:47:15 GMT+0800 (CST)
0 secs (0 hrs) behind the primary
db.system.replset.find()：查看复制集
配置信息：
rs0:PRIMARY> db.system.replset.find()
{ "_id" : "rs0", "version" : 3, "protocolVersion" : NumberLong(1), "members" : [ { "_id" : 0, "host" : "node1.pancou.com:27017", "arbiterOnly" : false, "buildIndexes" : true, "hidden" : false, "priority" : 1, "tags" : {}, "slaveDelay" : NumberLong(0), "votes" : 1 }, { "_id" : 1, "host" : "node2.pancou.com:27017", "arbiterOnly" : false, "buildIndexes" : true, "hidden" : false, "priority" : 1, "tags" : {}, "slaveDelay" : NumberLong(0), "votes" : 1 }, { "_id" : 2, "host" : "node3.pancou.com:27017", "arbiterOnly" : false, "buildIndexes" : true, "hidden" : false, "priority" : 1, "tags" : {}, "slaveDelay" : NumberLong(0), "votes" : 1 } ], "settings" : { "chainingAllowed" : true, "heartbeatIntervalMillis" : 2000, "heartbeatTimeoutSecs" : 10, "electionTimeoutMillis" : 10000, "catchUpTimeoutMillis" : 2000, "getLastErrorModes" : {}, "getLastErrorDefaults" : { "w" : 1, "wtimeout" : 0 }, "replicaSetId" : ObjectId("591dd3284fc6957e660dc933") } }
rs0:PRIMARY> db.system.replset.find().forEach(printjson)这种方式更直观
四、主从切换：
1、把node3冰冻30秒
rs0:SECONDARY> rs.freeze(30)
{ "ok" : 1 }
2、把node1 PRIMARY降级、
rs0:PRIMARY> rs.stepDown(30)
2017-05-19T02:09:27.945+0800 E QUERY Error: error doing query: failed: network error while attempting to run command 'replSetStepDown' on host '127.0.0.1:27017':
DB.prototype.runCommand@src/mongo/shell/db.js:132:1
DB.prototype.adminCommand@src/mongo/shell/db.js:150:16
rs.stepDown@src/mongo/shell/utils.js:1261:12
@(shell):1:1
2017-05-19T02:09:27.947+0800 I NETWORK trying reconnect to 127.0.0.1:27017 (127.0.0.1) failed
2017-05-19T02:09:27.949+0800 I NETWORK reconnect 127.0.0.1:27017 (127.0.0.1) ok
30秒后就变成从了
rs0:SECONDARY> rs.status()
{
"set" : "rs0",
"date" : ISODate("2017-05-18T18:12:09.732Z"),
"myState" : 2,
"term" : NumberLong(2),
"syncingTo" : "node2.pancou.com:27017",
"heartbeatIntervalMillis" : NumberLong(2000),
"optimes" : {
"lastCommittedOpTime" : {
"ts" : Timestamp(1495131128, 1),
"t" : NumberLong(2)
},
"appliedOpTime" : {
"ts" : Timestamp(1495131128, 1),
"t" : NumberLong(2)
},
"durableOpTime" : {
"ts" : Timestamp(1495131128, 1),
"t" : NumberLong(2)
}
},
"members" : [
{
"_id" : 0,
"name" : "node1.pancou.com:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 5519,
"optime" : {
"ts" : Timestamp(1495131128, 1),
"t" : NumberLong(2)
},
"optimeDate" : ISODate("2017-05-18T18:12:08Z"),
"syncingTo" : "node2.pancou.com:27017",
"configVersion" : 3,
"self" : true
},
{
"_id" : 1,
"name" : "node2.pancou.com:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 3866,
"optime" : {
"ts" : Timestamp(1495131118, 1),
"t" : NumberLong(2)
},
"optimeDurable" : {
"ts" : Timestamp(1495131118, 1),
"t" : NumberLong(2)
},
"optimeDate" : ISODate("2017-05-18T18:11:58Z"),
"optimeDurableDate" : ISODate("2017-05-18T18:11:58Z"),
"lastHeartbeat" : ISODate("2017-05-18T18:12:08.333Z"),
"lastHeartbeatRecv" : ISODate("2017-05-18T18:12:08.196Z"),
"pingMs" : NumberLong(0),
"electionTime" : Timestamp(1495130977, 1),
"electionDate" : ISODate("2017-05-18T18:09:37Z"),
"configVersion" : 3
},
{
"_id" : 2,
"name" : "node3.pancou.com:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 3857,
"optime" : {
"ts" : Timestamp(1495131118, 1),
"t" : NumberLong(2)
},
"optimeDurable" : {
"ts" : Timestamp(1495131118, 1),
"t" : NumberLong(2)
},
"optimeDate" : ISODate("2017-05-18T18:11:58Z"),
"optimeDurableDate" : ISODate("2017-05-18T18:11:58Z"),
"lastHeartbeat" : ISODate("2017-05-18T18:12:08.486Z"),
"lastHeartbeatRecv" : ISODate("2017-05-18T18:12:08.116Z"),
"pingMs" : NumberLong(0),
"syncingTo" : "node2.pancou.com:27017",
"configVersion" : 3
}
],
"ok" : 1
}
rs0:SECONDARY>
五、增减节点
1、增加节点
通过oplog增加节点，这种方式使数据的同步完全依赖于oplog,即oplog中有多少操作日志，这些操作日志就完全在新添加的节点中执行一遍，以完成同步。
在上面有一个3节点的复制集基础上，现在想配置并启动一个新节点，将其加入现在复制集环境中。
# rsync -avH --progress '-e ssh -p 22' /etc/hosts root@node2.pancou.com:/etc/
# rsync -avH --progress '-e ssh -p 22' /mongodb/mongokey root@node4.pancou.com:/mongodb/
# rsync -avH --progress '-e ssh -p 22' /etc/mongod.conf root@node4.pancou.com:/etc/
# iptables -I INPUT 4 -m state --state NEW -p tcp --dport 27017-j ACCEPT
在主上添加新节点：
rs0:PRIMARY> rs.add("node4.pancou.com")
{ "ok" : 1 }
rs0:PRIMARY> rs.status()
{
"set" : "rs0",
"date" : ISODate("2017-05-19T12:12:57.697Z"),
"myState" : 1,
"term" : NumberLong(8),
"heartbeatIntervalMillis" : NumberLong(2000),
"optimes" : {
"lastCommittedOpTime" : {
"ts" : Timestamp(1495195971, 1),
"t" : NumberLong(8)
},
"appliedOpTime" : {
"ts" : Timestamp(1495195971, 1),
"t" : NumberLong(8)
},
"durableOpTime" : {
"ts" : Timestamp(1495195971, 1),
"t" : NumberLong(8)
}
},
"members" : [
{
"_id" : 0,
"name" : "node1.pancou.com:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 159,
"optime" : {
"ts" : Timestamp(1495195971, 1),
"t" : NumberLong(8)
},
"optimeDurable" : {
"ts" : Timestamp(1495195971, 1),
"t" : NumberLong(8)
},
"optimeDate" : ISODate("2017-05-19T12:12:51Z"),
"optimeDurableDate" : ISODate("2017-05-19T12:12:51Z"),
"lastHeartbeat" : ISODate("2017-05-19T12:12:56.111Z"),
"lastHeartbeatRecv" : ISODate("2017-05-19T12:12:57.101Z"),
"pingMs" : NumberLong(0),
"syncingTo" : "node3.pancou.com:27017",
"configVersion" : 4
},
{
"_id" : 1,
"name" : "node2.pancou.com:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 189,
"optime" : {
"ts" : Timestamp(1495195971, 1),
"t" : NumberLong(8)
},
"optimeDurable" : {
"ts" : Timestamp(1495195971, 1),
"t" : NumberLong(8)
},
"optimeDate" : ISODate("2017-05-19T12:12:51Z"),
"optimeDurableDate" : ISODate("2017-05-19T12:12:51Z"),
"lastHeartbeat" : ISODate("2017-05-19T12:12:56.111Z"),
"lastHeartbeatRecv" : ISODate("2017-05-19T12:12:57.103Z"),
"pingMs" : NumberLong(0),
"syncingTo" : "node3.pancou.com:27017",
"configVersion" : 4
},
{
"_id" : 2,
"name" : "node3.pancou.com:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 191,
"optime" : {
"ts" : Timestamp(1495195971, 1),
"t" : NumberLong(8)
},
"optimeDate" : ISODate("2017-05-19T12:12:51Z"),
"electionTime" : Timestamp(1495195800, 1),
"electionDate" : ISODate("2017-05-19T12:10:00Z"),
"configVersion" : 4,
"self" : true
},
{
"_id" : 3,
"name" : "node4.pancou.com:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 71,
"optime" : {
"ts" : Timestamp(1495195971, 1),
"t" : NumberLong(8)
},
"optimeDurable" : {
"ts" : Timestamp(1495195971, 1),
"t" : NumberLong(8)
},
"optimeDate" : ISODate("2017-05-19T12:12:51Z"),
"optimeDurableDate" : ISODate("2017-05-19T12:12:51Z"),
"lastHeartbeat" : ISODate("2017-05-19T12:12:56.122Z"),
"lastHeartbeatRecv" : ISODate("2017-05-19T12:12:56.821Z"),
"pingMs" : NumberLong(1),
"syncingTo" : "node3.pancou.com:27017",
"configVersion" : 4
}
],
"ok" : 1
}
查看状态：
rs0:SECONDARY> rs.slaveOk()
rs0:SECONDARY> show dbs
admin 0.000GB
local 0.000GB
testdb0.000GB
rs0:SECONDARY> use testdb
switched to db testdb
rs0:SECONDARY> show collections
testcoll
rs0:SECONDARY> db.testcoll.find()
{ "_id" : ObjectId("591dd9f965cc255a5373aefa"), "name" : "tom", "age" : 25 }
rs0:SECONDARY>
rs0:SECONDARY> db.isMaster()
{
"hosts" : [
"node1.pancou.com:27017",
"node2.pancou.com:27017",
"node3.pancou.com:27017",
"node4.pancou.com:27017"
],
"setName" : "rs0",
"setVersion" : 4,
"ismaster" : false,
"secondary" : true,
"primary" : "node3.pancou.com:27017",
"me" : "node4.pancou.com:27017",
"lastWrite" : {
"opTime" : {
"ts" : Timestamp(1495196261, 1),
"t" : NumberLong(8)
},
"lastWriteDate" : ISODate("2017-05-19T12:17:41Z")
},
"maxBsonObjectSize" : 16777216,
"maxMessageSizeBytes" : 48000000,
"maxWriteBatchSize" : 1000,
"localTime" : ISODate("2017-05-19T12:17:44.104Z"),
"maxWireVersion" : 5,
"minWireVersion" : 0,
"readOnly" : false,
"ok" : 1
}
rs0:SECONDARY>
2、减少节点
rs0:PRIMARY> rs.remove("node4.pancou.com:27017")
{ "ok" : 1 }
rs0:PRIMARY> db.isMaster()
{
"hosts" : [
"node1.pancou.com:27017",
"node2.pancou.com:27017",
"node3.pancou.com:27017"
],
"setName" : "rs0",
"setVersion" : 5,
"ismaster" : true,
"secondary" : false,
"primary" : "node3.pancou.com:27017",
"me" : "node3.pancou.com:27017",
"electionId" : ObjectId("7fffffff0000000000000008"),
"lastWrite" : {
"opTime" : {
"ts" : Timestamp(1495196531, 1),
"t" : NumberLong(8)
},
"lastWriteDate" : ISODate("2017-05-19T12:22:11Z")
},
"maxBsonObjectSize" : 16777216,
"maxMessageSizeBytes" : 48000000,
"maxWriteBatchSize" : 1000,
"localTime" : ISODate("2017-05-19T12:22:19.874Z"),
"maxWireVersion" : 5,
"minWireVersion" : 0,
"readOnly" : false,
"ok" : 1
}
rs0:PRIMARY>
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