mongodb集群配置副本集

   

• 测试环境

  操作系统：CentOS 7.2 最小化安装

  主服务器IP地址：192.168.197.21 mongo01

  从服务器IP地址：192.168.197.22 mongo02

  从服务器IP地址：192.168.197.23 mongo03

  关闭selinux，关闭防火墙。

  Mongodb版本：mongodb-linux-x86_64-3.4.10.tgz

• 上传mongodb包到/software目录下，然后解压缩该包

  [root@localhost software]# tar -zxvf mongodb-linux-x86_64-3.4.10.tgz

• 移动解压缩之后的文件至/usr/local/mongodb目录

  [root@localhost software]# mv mongodb-linux-x86_64-3.4.10 /usr/local/mongodb

• 在mongodb下面创建data目录和logs目录，用于存放data和logs

  [root@localhost local]# mkdir -p /usr/local/mongodb/data

  [root@localhost local]# mkdir -p /usr/local/mongodb/logs

• 增加环境变量，并使环境变量生效

  [root@localhost data]# vi /etc/profile

  export PATH=$PATH:/usr/local/mongodb/bin

  [root@localhost data]# source /etc/profile

• 创建mongodb.conf文件并写入以下内容

  [root@localhost data]# touch /usr/local/mongodb/bin/mongodb.conf

  [root@localhost data]# vi /usr/local/mongodb/bin/mongodb.conf

• 主服务器配置

  [root@mongo01 ~]# more /usr/local/mongodb/bin/mongodb.conf

  port=27017

  bind_ip=192.168.197.21

  dbpath=/usr/local/mongodb/data

  logpath=/usr/local/mongodb/logs/log.log

  pidfilepath=/usr/local/mongodb/mongo.pid

  fork=true

  logappend=true

  shardsvr=true

  directoryperdb=true

  #auth=true

  #keyFile=/usr/local/mongodb/keyfile

  replSet=hqmongodb

• 从服务器配置

  [root@mongo02 ~]# more /usr/local/mongodb/bin/mongodb.conf

  port=27017

  bind_ip=192.168.197.22

  dbpath=/usr/local/mongodb/data

  logpath=/usr/local/mongodb/logs/log.log

  pidfilepath=/usr/local/mongodb/mongo.pid

  fork=true

  logappend=true

  shardsvr=true

  directoryperdb=true

  #auth=true #暂时注释掉这里，后期开启验证时再取消注释

  #keyFile=/usr/local/mongodb/keyfile #暂时注释掉这里，后期开启验证时再取消注释

  replSet=hqmongodb

  [root@mongo03 ~]# more /usr/local/mongodb/bin/mongodb.conf

  port=27017

  bind_ip=192.168.197.23

  dbpath=/usr/local/mongodb/data

  logpath=/usr/local/mongodb/logs/log.log

  pidfilepath=/usr/local/mongodb/mongo.pid

  fork=true

  logappend=true

  shardsvr=true

  directoryperdb=true

  #auth=true #暂时注释掉这里，后期开启验证时再取消注释

  #keyFile=/usr/local/mongodb/keyfile #暂时注释掉这里，后期开启验证时再取消注释

  replSet=hqmongodb

• 使用配置文件启动三台服务器上的数据库

  mongod --config /usr/local/mongodb/bin/mongodb.conf

• 登陆主节点初始化副本集

  [root@mongo01 software]# mongo 192.168.197.21:27017

  MongoDB shell version v3.4.10

  connecting to: 192.168.197.21:27017

  MongoDB server version: 3.4.10

  Welcome to the MongoDB shell.

  For interactive help, type "help".

  For more comprehensive documentation, see

  http://docs.mongodb.org/

  Questions? Try the support group

  http://groups.google.com/group/mongodb-user

  Server has startup warnings:

  2019-02-12T03:04:58.259-0500 I CONTROL [initandlisten]

  2019-02-12T03:04:58.259-0500 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database.

  2019-02-12T03:04:58.259-0500 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted.

  2019-02-12T03:04:58.259-0500 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.

  2019-02-12T03:04:58.259-0500 I CONTROL [initandlisten]

  2019-02-12T03:04:58.260-0500 I CONTROL [initandlisten]

  2019-02-12T03:04:58.260-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.

  2019-02-12T03:04:58.260-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never'

  2019-02-12T03:04:58.260-0500 I CONTROL [initandlisten]

  2019-02-12T03:04:58.260-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.

  2019-02-12T03:04:58.260-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never'

  2019-02-12T03:04:58.260-0500 I CONTROL [initandlisten]

  > rs.initiate() #初始化副本集

  {

  "info2" : "no configuration specified. Using a default configuration for the set",

  "me" : "192.168.197.21:27017",

  "ok" : 1

  }

  hqmongodb:OTHER> rs.conf() #查看集群状态

  {

  "_id" : "hqmongodb",

  "version" : 1,

  "protocolVersion" : NumberLong(1),

  "members" : [

  {

  "_id" : 0,

  "host" : "192.168.197.21:27017",

  "arbiterOnly" : false,

  "buildIndexes" : true,

  "hidden" : false,

  "priority" : 1,

  "tags" : {

  },

  "slaveDelay" : NumberLong(0),

  "votes" : 1

  }

  ],

  "settings" : {

  "chainingAllowed" : true,

  "heartbeatIntervalMillis" : 2000,

  "heartbeatTimeoutSecs" : 10,

  "electionTimeoutMillis" : 10000,

  "catchUpTimeoutMillis" : 60000,

  "getLastErrorModes" : {

  },

  "getLastErrorDefaults" : {

  "w" : 1,

  "wtimeout" : 0

  },

  "replicaSetId" : ObjectId("5c627f1190e39641c3d0e91f")

  }

  }

  hqmongodb:PRIMARY> rs.add("192.168.197.22:27017") #添加节点到集群中

  { "ok" : 1 }

  hqmongodb:PRIMARY> rs.add("192.168.197.23:27017") #添加节点到集群中

  { "ok" : 1 }

  hqmongodb:PRIMARY> cfg = rs.conf() #查看集群中各节点的信息

  {

  "_id" : "hqmongodb",

  "version" : 3,

  "protocolVersion" : NumberLong(1),

  "members" : [

  {

  "_id" : 0,

  "host" : "192.168.197.21:27017",

  "arbiterOnly" : false,

  "buildIndexes" : true,

  "hidden" : false,

  "priority" : 1, #优先级，优先级范围为0-100，为0时不会被选为主节点，越大越容易被选为主节点

  "tags" : {

  },

  "slaveDelay" : NumberLong(0),

  "votes" : 1

  },

  {

  "_id" : 1,

  "host" : "192.168.197.22:27017",

  "arbiterOnly" : false,

  "buildIndexes" : true,

  "hidden" : false,

  "priority" : 1,

  "tags" : {

  },

  "slaveDelay" : NumberLong(0),

  "votes" : 1

  },

  {

  "_id" : 2,

  "host" : "192.168.197.23:27017",

  "arbiterOnly" : false,

  "buildIndexes" : true,

  "hidden" : false,

  "priority" : 1,

  "tags" : {

  },

  "slaveDelay" : NumberLong(0),

  "votes" : 1

  }

  ],

  "settings" : {

  "chainingAllowed" : true,

  "heartbeatIntervalMillis" : 2000,

  "heartbeatTimeoutSecs" : 10,

  "electionTimeoutMillis" : 10000,

  "catchUpTimeoutMillis" : 60000,

  "getLastErrorModes" : {

  },

  "getLastErrorDefaults" : {

  "w" : 1,

  "wtimeout" : 0

  },

  "replicaSetId" : ObjectId("5c627f1190e39641c3d0e91f")

  }

  }

  hqmongodb:PRIMARY> rs.reconfig(cfg) #使配置生效

  { "ok" : 1 }

• 登陆两台从节点操作

  [root@mongo02 software]# mongo 192.168.197.22:27017

  MongoDB shell version v3.4.10

  connecting to: 192.168.197.22:27017

  MongoDB server version: 3.4.10

  Welcome to the MongoDB shell.

  For interactive help, type "help".

  For more comprehensive documentation, see

  http://docs.mongodb.org/

  Questions? Try the support group

  http://groups.google.com/group/mongodb-user

  Server has startup warnings:

  2019-02-12T03:06:00.986-0500 I CONTROL [initandlisten]

  2019-02-12T03:06:00.986-0500 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database.

  2019-02-12T03:06:00.986-0500 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted.

  2019-02-12T03:06:00.986-0500 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.

  2019-02-12T03:06:00.986-0500 I CONTROL [initandlisten]

  2019-02-12T03:06:00.987-0500 I CONTROL [initandlisten]

  2019-02-12T03:06:00.987-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.

  2019-02-12T03:06:00.987-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never'

  2019-02-12T03:06:00.987-0500 I CONTROL [initandlisten]

  2019-02-12T03:06:00.987-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.

  2019-02-12T03:06:00.987-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never'

  2019-02-12T03:06:00.987-0500 I CONTROL [initandlisten]

  hqmongodb:SECONDARY> db.getMongo().setSlaveOk() #设置从节点为只读.注意从节点的前缀现在是SECONDARY。看清楚才设置，执行这个，否则后续从节点同步数据时会报错："errmsg" : "not master and slaveOk=false"

  [root@mongo03 software]# mongo 192.168.197.23:27017

  MongoDB shell version v3.4.10

  connecting to: 192.168.197.23:27017

  MongoDB server version: 3.4.10

  Welcome to the MongoDB shell.

  For interactive help, type "help".

  For more comprehensive documentation, see

  http://docs.mongodb.org/

  Questions? Try the support group

  http://groups.google.com/group/mongodb-user

  Server has startup warnings:

  2019-02-12T03:06:41.579-0500 I CONTROL [initandlisten]

  2019-02-12T03:06:41.579-0500 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database.

  2019-02-12T03:06:41.579-0500 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted.

  2019-02-12T03:06:41.579-0500 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.

  2019-02-12T03:06:41.579-0500 I CONTROL [initandlisten]

  2019-02-12T03:06:41.580-0500 I CONTROL [initandlisten]

  2019-02-12T03:06:41.580-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.

  2019-02-12T03:06:41.580-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never'

  2019-02-12T03:06:41.580-0500 I CONTROL [initandlisten]

  2019-02-12T03:06:41.580-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.

  2019-02-12T03:06:41.580-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never'

  2019-02-12T03:06:41.580-0500 I CONTROL [initandlisten]

  hqmongodb:SECONDARY> db.getMongo().setSlaveOk() #设置从节点为只读.注意从节点的前缀现在是SECONDARY。看清楚才设置，执行这个，否则后续从节点同步数据时会报错："errmsg" : "not master and slaveOk=false"

• 设置管理员账号，开启登陆验证

  登陆主节点确定登陆后的前缀是PRIMARY

  [root@mongo01 software]# mongo 192.168.197.21:27017

  MongoDB shell version v3.4.10

  connecting to: 192.168.197.21:27017

  MongoDB server version: 3.4.10

  Server has startup warnings:

  2019-02-12T03:04:58.259-0500 I CONTROL [initandlisten]

  2019-02-12T03:04:58.259-0500 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database.

  2019-02-12T03:04:58.259-0500 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted.

  2019-02-12T03:04:58.259-0500 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.

  2019-02-12T03:04:58.259-0500 I CONTROL [initandlisten]

  2019-02-12T03:04:58.260-0500 I CONTROL [initandlisten]

  2019-02-12T03:04:58.260-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.

  2019-02-12T03:04:58.260-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never'

  2019-02-12T03:04:58.260-0500 I CONTROL [initandlisten]

  2019-02-12T03:04:58.260-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.

  2019-02-12T03:04:58.260-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never'

  2019-02-12T03:04:58.260-0500 I CONTROL [initandlisten]

  hqmongodb:PRIMARY> show dbs

  local 0.000GB

  hqmongodb:PRIMARY> use admin #mongodb3.0版本没有admin数据库，需要手动创建admin库，然后在admin库下添加管理员账户

  switched to db admin

  hqmongodb:PRIMARY> show collections

  hqmongodb:PRIMARY> db.createUser({user:"system",pwd:"123456",roles:[{role:"root",db:"admin"}]}) #添加系统管理员用户system，同来管理用户

  Successfully added user: {

  "user" : "system",

  "roles" : [

  {

  "role" : "root",

  "db" : "admin"

  }

  ]

  }

  hqmongodb:PRIMARY> db.auth('system','123456') #添加管理员用户认证，认证之后才可以管理数据库

  1

  hqmongodb:PRIMARY> db.createUser({user:'administrator', pwd:'123456', roles:[{ role: "userAdminAnyDatabase", db: "admin"}]}); #添加数据库管理员administator，同来管理所有数据库

  Successfully added user: {

  "user" : "administrator",

  "roles" : [

  {

  "role" : "userAdminAnyDatabase",

  "db" : "admin"

  }

  ]

  }

  hqmongodb:PRIMARY> db.auth('administrator','123456') #添加管理员用户认证

  1

  hqmongodb:PRIMARY> db

  admin

  hqmongodb:PRIMARY> show collections

  system.users

  system.version

  hqmongodb:PRIMARY> db.system.users.find()

  { "_id" : "admin.system", "user" : "system", "db" : "admin", "credentials" : { "SCRAM-SHA-1" : { "iterationCount" : 10000, "salt" : "YnrIFQ9fDFp5rUUePmkfSg==", "storedKey" : "7DtAOhrPS63eJCb7eEDaLJAMoqs=", "serverKey" : "diT9vhEInnsuI/PFgJD36VNgeyQ=" } }, "roles" : [ { "role" : "root", "db" : "admin" } ] }

  { "_id" : "admin.administrator", "user" : "administrator", "db" : "admin", "credentials" : { "SCRAM-SHA-1" : { "iterationCount" : 10000, "salt" : "1c5T2GUBattsdn3bMs3kJw==", "storedKey" : "KjzcNnkCzJe6XKGF94gpwk6UZcQ=", "serverKey" : "J1WYtTwGZ/ZpUTl5P5ZMUHxFiuI=" } }, "roles" : [ { "role" : "userAdminAnyDatabase", "db" : "admin" } ] }

• 为集群开启登陆验证

  [root@mongo01 software]# cd /usr/local/mongodb/

  [root@mongo01 mongodb]# openssl rand -base64 21 > keyfile #创建一个 keyfile(使用 openssl 生成 21 位 base64 加密的字符串)，长短最好是3的倍数，否则生成的字符串可能含有非法字符会导致认证失败

  [root@mongo01 mongodb]# chmod 600 /usr/local/mongodb/keyfile #更改文件权限

  [root@mongo01 mongodb]# cat /usr/local/mongodb/keyfile #查看生成的字符串，并做记录

  ROiB0DZZXbpLg4D7lOMifa2g2Jd8

  取消所有节点上配置文件中之前注释的内容，如下内容

  [root@mongo01 mongodb]# vi /usr/local/mongodb/bin/mongodb.conf

  auth=true #取消这里的注释，开启登陆验证

  keyFile=/usr/local/mongodb/keyfile #取消这里的注释，开启登陆验证

• 将之前主节点上生成的21位字符串复制到各节点上的keyfile文件中，并更改权限

  [root@mongo02 software]# vi /usr/local/mongodb/keyfile

  [root@mongo02 software]# cat /usr/local/mongodb/keyfile

  ROiB0DZZXbpLg4D7lOMifa2g2Jd8

  [root@mongo02 software]# chmod 600 /usr/local/mongodb/keyfile

  [root@mongo03 software]# vi /usr/local/mongodb/bin/mongodb.conf

  [root@mongo03 software]# vi /usr/local/mongodb/keyfile

  [root@mongo03 software]# cat /usr/local/mongodb/keyfile

  ROiB0DZZXbpLg4D7lOMifa2g2Jd8

  [root@mongo03 software]# chmod 600 /usr/local/mongodb/keyfile

• 设置mongodb的开机启动，首先要在系统服务目录下创建启动文件mongodb.servicer然后写入一下内容

  [root@localhost system]# cd /lib/systemd/system

  [root@localhost system]# vi mongodb.service

  [Unit]

  Description=mongodb

  After=network.target remote-fs.target nss-lookup.target

  [Service]

  Type=forking

  ExecStart=/usr/local/mongodb/bin/mongod -f /usr/local/mongodb/bin/mongodb.conf

  ExecReload=/bin/kill -s HUP $MAINPID

  ExecStop=/usr/local/mongodb/bin/mongod --shutdown

  PrivateTmp=true

  [Install]

  WantedBy=multi-user.target

  注册到开机启动

  [root@localhost system]# systemctl enable mongodb.service

  Created symlink from /etc/systemd/system/multi-user.target.wants/mongodb.service to /usr/lib/systemd/system/mongodb.service.

• 重启所有服务器，然后使用administrator或者system登陆，然后写入20条数据。

  [root@mongo01 ~]# mongo 192.168.197.21:27017 -u system -p 123456 --authenticationDatabase admin

  MongoDB shell version v3.4.10

  connecting to: 192.168.197.21:27017

  MongoDB server version: 3.4.10

  Server has startup warnings:

  2019-02-12T04:18:16.929-0500 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.

  2019-02-12T04:18:16.929-0500 I CONTROL [initandlisten]

  2019-02-12T04:18:16.929-0500 I CONTROL [initandlisten]

  2019-02-12T04:18:16.929-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.

  2019-02-12T04:18:16.929-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never'

  2019-02-12T04:18:16.929-0500 I CONTROL [initandlisten]

  2019-02-12T04:18:16.929-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.

  2019-02-12T04:18:16.929-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never'

  2019-02-12T04:18:16.929-0500 I CONTROL [initandlisten]

  hqmongodb:PRIMARY>

  hqmongodb:PRIMARY>

  hqmongodb:PRIMARY> rs.status() #查看集群状态

  {

  "set" : "hqmongodb",

  "date" : ISODate("2019-02-12T09:28:30.936Z"),

  "myState" : 1,

  "term" : NumberLong(34),

  "heartbeatIntervalMillis" : NumberLong(2000),

  "optimes" : {

  "lastCommittedOpTime" : {

  "ts" : Timestamp(1549963707, 1),

  "t" : NumberLong(34)

  },

  "appliedOpTime" : {

  "ts" : Timestamp(1549963707, 1),

  "t" : NumberLong(34)

  },

  "durableOpTime" : {

  "ts" : Timestamp(1549963707, 1),

  "t" : NumberLong(34)

  }

  },

  "members" : [

  {

  "_id" : 0,

  "name" : "192.168.197.21:27017",

  "health" : 1,

  "state" : 1, #state为1的代表该节点目前为主节点，为2代表从节点，为8代表离线

  "stateStr" : "PRIMARY",

  "uptime" : 615,

  "optime" : {

  "ts" : Timestamp(1549963707, 1),

  "t" : NumberLong(34)

  },

  "optimeDate" : ISODate("2019-02-12T09:28:27Z"),

  "electionTime" : Timestamp(1549963666, 1),

  "electionDate" : ISODate("2019-02-12T09:27:46Z"),

  "configVersion" : 4,

  "self" : true

  },

  {

  "_id" : 1,

  "name" : "192.168.197.22:27017",

  "health" : 1,

  "state" : 2,

  "stateStr" : "SECONDARY",

  "uptime" : 17,

  "optime" : {

  "ts" : Timestamp(1549963707, 1),

  "t" : NumberLong(34)

  },

  "optimeDurable" : {

  "ts" : Timestamp(1549963707, 1),

  "t" : NumberLong(34)

  },

  "optimeDate" : ISODate("2019-02-12T09:28:27Z"),

  "optimeDurableDate" : ISODate("2019-02-12T09:28:27Z"),

  "lastHeartbeat" : ISODate("2019-02-12T09:28:29.716Z"),

  "lastHeartbeatRecv" : ISODate("2019-02-12T09:28:29.133Z"),

  "pingMs" : NumberLong(0),

  "syncingTo" : "192.168.197.23:27017",

  "configVersion" : 4

  },

  {

  "_id" : 2,

  "name" : "192.168.197.23:27017",

  "health" : 1,

  "state" : 2,

  "stateStr" : "SECONDARY",

  "uptime" : 613,

  "optime" : {

  "ts" : Timestamp(1549963707, 1),

  "t" : NumberLong(34)

  },

  "optimeDurable" : {

  "ts" : Timestamp(1549963707, 1),

  "t" : NumberLong(34)

  },

  "optimeDate" : ISODate("2019-02-12T09:28:27Z"),

  "optimeDurableDate" : ISODate("2019-02-12T09:28:27Z"),

  "lastHeartbeat" : ISODate("2019-02-12T09:28:30.719Z"),

  "lastHeartbeatRecv" : ISODate("2019-02-12T09:28:29.385Z"),

  "pingMs" : NumberLong(0),

  "syncingTo" : "192.168.197.21:27017",

  "configVersion" : 4

  }

  ],

  "ok" : 1

  }

  hqmongodb:PRIMARY> function add(){var i = 0;for(;i<20;i++){db.persons.insert({"nameA":"li"+i})}} #插入数据的命令

  hqmongodb:PRIMARY> add() #插入

  hqmongodb:PRIMARY> db.persons.find() #查看插入的数据

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e5f"), "nameA" : "li0" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e60"), "nameA" : "li1" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e61"), "nameA" : "li2" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e62"), "nameA" : "li3" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e63"), "nameA" : "li4" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e64"), "nameA" : "li5" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e65"), "nameA" : "li6" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e66"), "nameA" : "li7" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e67"), "nameA" : "li8" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e68"), "nameA" : "li9" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e69"), "nameA" : "li10" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e6a"), "nameA" : "li11" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e6b"), "nameA" : "li12" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e6c"), "nameA" : "li13" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e6d"), "nameA" : "li14" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e6e"), "nameA" : "li15" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e6f"), "nameA" : "li16" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e70"), "nameA" : "li17" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e71"), "nameA" : "li18" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e72"), "nameA" : "li19" }

• 登陆从节点查看同步过来的数据

  [root@mongo02 ~]# mongo 192.168.197.23:27017 -u system -p 123456 --authenticationDatabase admin

  MongoDB shell version v3.4.10

  connecting to: 192.168.197.23:27017

  MongoDB server version: 3.4.10

  Server has startup warnings:

  2019-02-12T04:18:10.941-0500 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.

  2019-02-12T04:18:10.941-0500 I CONTROL [initandlisten]

  2019-02-12T04:18:10.941-0500 I CONTROL [initandlisten]

  2019-02-12T04:18:10.941-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.

  2019-02-12T04:18:10.941-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never'

  2019-02-12T04:18:10.941-0500 I CONTROL [initandlisten]

  2019-02-12T04:18:10.941-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.

  2019-02-12T04:18:10.941-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never'

  2019-02-12T04:18:10.941-0500 I CONTROL [initandlisten]

  hqmongodb:SECONDARY>

  hqmongodb:SECONDARY>

  hqmongodb:SECONDARY>

  hqmongodb:SECONDARY> show dbs #这里报错，执行rs.slaveOk()命令后在执行show dbs即可

  2019-02-12T04:31:34.256-0500 E QUERY [thread1] Error: listDatabases failed:{

  "ok" : 0,

  "errmsg" : "not master and slaveOk=false",

  "code" : 13435,

  "codeName" : "NotMasterNoSlaveOk"

  } :

  _getErrorWithCode@src/mongo/shell/utils.js:25:13

  Mongo.prototype.getDBs@src/mongo/shell/mongo.js:62:1

  shellHelper.show@src/mongo/shell/utils.js:781:19

  shellHelper@src/mongo/shell/utils.js:671:15

  @(shellhelp2):1:1

  hqmongodb:SECONDARY> rs.slaveOk()

  hqmongodb:SECONDARY> show dbs

  admin 0.000GB

  local 0.000GB

  test 0.000GB

  hqmongodb:SECONDARY> db.persons.find() #查看同步过来的数据

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e62"), "nameA" : "li3" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e5f"), "nameA" : "li0" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e61"), "nameA" : "li2" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e60"), "nameA" : "li1" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e64"), "nameA" : "li5" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e63"), "nameA" : "li4" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e68"), "nameA" : "li9" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e66"), "nameA" : "li7" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e65"), "nameA" : "li6" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e67"), "nameA" : "li8" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e6b"), "nameA" : "li12" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e69"), "nameA" : "li10" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e6a"), "nameA" : "li11" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e6c"), "nameA" : "li13" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e6e"), "nameA" : "li15" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e6f"), "nameA" : "li16" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e70"), "nameA" : "li17" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e71"), "nameA" : "li18" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e6d"), "nameA" : "li14" }

  { "_id" : ObjectId("5c62921369ee6b1f7b0c1e72"), "nameA" : "li19" }

• 测试当前主节点上的网络，然后查看集群状态

  断开了197.21（当前主节点）的网络，然后登陆22或者23任意和节点查看主节点是否已经改变

  [root@mongo02 ~]# mongo 192.168.197.23:27017 -u system -p 123456 --authenticationDatabase admin

  MongoDB shell version v3.4.10

  connecting to: 192.168.197.23:27017

  MongoDB server version: 3.4.10

  Server has startup warnings:

  2019-02-12T04:18:10.941-0500 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.

  2019-02-12T04:18:10.941-0500 I CONTROL [initandlisten]

  2019-02-12T04:18:10.941-0500 I CONTROL [initandlisten]

  2019-02-12T04:18:10.941-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.

  2019-02-12T04:18:10.941-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never'

  2019-02-12T04:18:10.941-0500 I CONTROL [initandlisten]

  2019-02-12T04:18:10.941-0500 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.

  2019-02-12T04:18:10.941-0500 I CONTROL [initandlisten] ** We suggest setting it to 'never'

  2019-02-12T04:18:10.941-0500 I CONTROL [initandlisten]

  hqmongodb:PRIMARY> rs.status() #登陆后看到前缀是PRIMARY，即为当前登陆的是主节点

  {

  "set" : "hqmongodb",

  "date" : ISODate("2019-02-12T10:49:16.358Z"),

  "myState" : 1,

  "term" : NumberLong(35),

  "heartbeatIntervalMillis" : NumberLong(2000),

  "optimes" : {

  "lastCommittedOpTime" : {

  "ts" : Timestamp(1549968548, 1),

  "t" : NumberLong(35)

  },

  "appliedOpTime" : {

  "ts" : Timestamp(1549968548, 1),

  "t" : NumberLong(35)

  },

  "durableOpTime" : {

  "ts" : Timestamp(1549968548, 1),

  "t" : NumberLong(35)

  }

  },

  "members" : [

  {

  "_id" : 0,

  "name" : "192.168.197.21:27017",

  "health" : 0,

  "state" : 8, 状态为8，代表此节点已经离线

  "stateStr" : "(not reachable/healthy)",

  "uptime" : 0,

  "optime" : {

  "ts" : Timestamp(0, 0),

  "t" : NumberLong(-1)

  },

  "optimeDurable" : {

  "ts" : Timestamp(0, 0),

  "t" : NumberLong(-1)

  },

  "optimeDate" : ISODate("1970-01-01T00:00:00Z"),

  "optimeDurableDate" : ISODate("1970-01-01T00:00:00Z"),

  "lastHeartbeat" : ISODate("2019-02-12T10:49:09.228Z"),

  "lastHeartbeatRecv" : ISODate("2019-02-12T10:48:45.604Z"),

  "pingMs" : NumberLong(0),

  "lastHeartbeatMessage" : "Couldn't get a connection within the time limit",

  "configVersion" : -1

  },

  {

  "_id" : 1,

  "name" : "192.168.197.22:27017",

  "health" : 1,

  "state" : 2,

  "stateStr" : "SECONDARY",

  "uptime" : 4862,

  "optime" : {

  "ts" : Timestamp(1549968548, 1),

  "t" : NumberLong(35)

  },

  "optimeDurable" : {

  "ts" : Timestamp(1549968548, 1),

  "t" : NumberLong(35)

  },

  "optimeDate" : ISODate("2019-02-12T10:49:08Z"),

  "optimeDurableDate" : ISODate("2019-02-12T10:49:08Z"),

  "lastHeartbeat" : ISODate("2019-02-12T10:49:15.981Z"),

  "lastHeartbeatRecv" : ISODate("2019-02-12T10:49:15.383Z"),

  "pingMs" : NumberLong(0),

  "syncingTo" : "192.168.197.23:27017",

  "configVersion" : 4

  },

  {

  "_id" : 2,

  "name" : "192.168.197.23:27017",

  "health" : 1,

  "state" : 1, #状态为1，代表23即为当前的主节点

  "stateStr" : "PRIMARY",

  "uptime" : 5468,

  "optime" : {

  "ts" : Timestamp(1549968548, 1),

  "t" : NumberLong(35)

  },

  "optimeDate" : ISODate("2019-02-12T10:49:08Z"),

  "electionTime" : Timestamp(1549968535, 1),

  "electionDate" : ISODate("2019-02-12T10:48:55Z"),

  "configVersion" : 4,

  "self" : true

  }

  ],

  "ok" : 1

  }

• 登陆命令

  [root@mongo01 software]# mongo 192.168.197.21:27017 -u system -p 123456 --authenticationDatabase admin

  [root@mongo01 software]# mongo 192.168.197.21:27017 -u administrator -p 123456 --authenticationDatabase admin