Mongodb 4.0 版本 基础操作—复制集，选举方法、部署认证 （二）

一、MongoDB 复制集

• 简介：

  1.Mongodb复制集由一组Mongod实例（进程）组成，包含一个Primary节点和多个Secondary节点，Mongodb Driver（客户端）的所有数据都写入Primary，Secondary从Primary同步写入的数据，以保持复制集内所有成员存储相同的数据集，提供数据的高可用。

  2、客户端在主节点写入数据，在从节点读取数据，主节点和从节点进行数据交互保证数据一致性，如果其中一个节点出了故障，其他发节点马上将业务接过来无需停机操作。

• 优势

  让数据更安全；
  搞数据可用性；
  灾难恢复；
  无停机维护（如备份，重建索引，故障转移）；
  读缩放（额外的副本读取）；
  副本集对应用程序是透明的。

• 特点

  N个几点的群集；
  任何节点可作为主节点；
  所有写入操作都在主节点上；
  自动故障转移；
  自动恢复。

二、部署复制集

2.1: 部署四个多实例

• 安装

• 1.配置yum源仓库
  [root@localhost ~]# cd /etc/yum.repos.d/
  [root@localhost yum.repos.d]# vim mongodb-org.repo
  [mangodb-org]
  name=MongoDB Repository
  baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.6/x86_64/
  gpgcheck=1     '开启检查'
  enabled=1      '开启'
  gpgkey=https://www.mongodb.org/static/pgp/server-3.6.asc
  [root@localhost yum.repos.d]# yum list '重新加载一下'2.安装MongoDB
  [root@localhost yum.repos.d]# yum install mongodb-org -y   '安装mongodb工具包'
  [root@localhost yum.repos.d]# vim /etc/mongod.conf
  systemLog:destination: filelogAppend: truepath: /var/log/mongodb/mongod.log    <----日志文件位置
  storage:dbPath: /var/lib/mongo   <---数据文件存放位置
  net:port: 27017  bindIp: 0.0.0.0   '将自己的地址改成任意地址,允许别人访问'
  [root@localhost yum.repos.d]# systemctl start mongod.service  '开启服务'
  [root@localhost yum.repos.d]# netstat -ntap |grep mongod
  tcp        0      0 0.0.0.0:27017           0.0.0.0:*               LISTEN      12857mongod
  [root@localhost yum.repos.d]# iptables -F
  [root@localhost yum.repos.d]# setenforce 0
  [root@localhost yum.repos.d]# mongo
  exit退出3. 配置多实例[root@promote bin]# cd /etc[root@mongod etc]# cp -p  mongod.conf mongod2.conf[root@mongod etc]# cp -p  mongod.conf mongod3.conf[root@mongod etc]# cp -p  mongod.conf mongod4.conf[root@promote etc]# vim mongod2.confsystemLog:destination: filelogAppend: truepath: /data/mongodb/mongod2.log# Where and how to store data.storage:dbPath: /data/mongodb/mongod2journal:enabled: truenet:port: 27018bindIp: 0.0.0.0 [root@promote etc]# vim mongodb3.conf systemLog:destination: filelogAppend: truepath: /data/mongodb/mongod3.log# Where and how to store data.storage:dbPath: /data/mongodb/mongod3journal:enabled: truenet:port: 27019bindIp: 0.0.0.0[root@promote etc]# vim mongodb4.confsystemLog:destination: filelogAppend: truepath: /data/mongodb/mongod4.log# Where and how to store data.storage:dbPath: /data/mongodb/mongod4journal:enabled: truenet:port: 27020bindIp: 0.0.0.0[root@promote data]# cd /data/mongodb/[root@promote data]# mkdir -p mongod2/[root@promote data]# mkdir -p mongodd3/[root@promote data]# mkdir -p mongodd4/[root@promote mongodb]# touch mongod2.log[root@promote mongodb]# touch mongod3.log[root@promote mongodb]# touch mongod4.log[root@test01 mongodb]# lsmongod2  mongod2.log  mongod3  mongod3.log  mongod4  mongod4.log[root@promote mongodb]# chmod 777 mongod*[root@localhost ~ ]# mongod -f /etc/mongod2.conf --shutdown[root@localhost s~]# mongod -f /etc/mongod2.conf[root@localhost ~ ]# mongod -f /etc/mongod3.conf --shutdown[root@localhost s~]# mongod -f /etc/mongod3.conf[root@localhost ~ ]# mongod -f /etc/mongod4.conf --shutdown[root@localhost s~]# mongod -f /etc/mongod4.conf

2.2: 修改复制集的主从

• 修改复制集的主从

[root@localhost ~]# mongo
> cfg={"_id":"lpf","members":[{"_id":0,"host":"192.168.100.140:27017"},{"_id":1,"host":"192.168.100.140:27018"},{"_id":2,"host":"192.168.100.140:27019"}]}
{"_id" : "lpf","members" : [{"_id" : 0,"host" : "192.168.100.140:27017"},{"_id" : 1,"host" : "192.168.100.140:27018"},{"_id" : 2,"host" : "192.168.100.140:27019"}]
}
> db.stats()
{"operationTime" : Timestamp(0, 0),"ok" : 0,"errmsg" : "node is not in primary or recovering state","code" : 13436,"codeName" : "NotMasterOrSecondary","$clusterTime" : {"clusterTime" : Timestamp(0, 0),"signature" : {"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),"keyId" : NumberLong(0)}}
}> rs.initiate(cfg)          "启动复制集"
{"ok" : 1,"operationTime" : Timestamp(1600568185, 1),"$clusterTime" : {"clusterTime" : Timestamp(1600568185, 1),"signature" : {"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),"keyId" : NumberLong(0)}}
}> db.stats()    '查看复制集'
{"operationTime" : Timestamp(0, 0),"ok" : 0,"errmsg" : "node is not in primary or recovering state","code" : 13436,"codeName" : "NotMasterOrSecondary","$clusterTime" : {"clusterTime" : Timestamp(0, 0),"signature" : {"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),"keyId" : NumberLong(0)}}
}> rs.initiate(cfg)  '启动复制集'
{"ok" : 1,"operationTime" : Timestamp(1600103422, 1),"$clusterTime" : {"clusterTime" : Timestamp(1600103422, 1),"signature" : {"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),"keyId" : NumberLong(0)}}
}
lpf:PRIMARY> rs.status()                     "查看复制集状态"
{"set" : "lpf","date" : ISODate("2020-09-20T02:21:54.811Z"),"myState" : 1,"term" : NumberLong(1),"syncingTo" : "","syncSourceHost" : "","syncSourceId" : -1,"heartbeatIntervalMillis" : NumberLong(2000),"optimes" : {"lastCommittedOpTime" : {"ts" : Timestamp(1600568512, 2),"t" : NumberLong(1)},"readConcernMajorityOpTime" : {"ts" : Timestamp(1600568512, 2),"t" : NumberLong(1)},"appliedOpTime" : {"ts" : Timestamp(1600568512, 2),"t" : NumberLong(1)},"durableOpTime" : {"ts" : Timestamp(1600568512, 2),"t" : NumberLong(1)}},"members" : [{"_id" : 0,"name" : "192.168.100.140:27017","health" : 1,"state" : 1,"stateStr" : "PRIMARY","uptime" : 903,"optime" : {"ts" : Timestamp(1600568512, 2),"t" : NumberLong(1)},"optimeDate" : ISODate("2020-09-20T02:21:52Z"),"syncingTo" : "","syncSourceHost" : "","syncSourceId" : -1,"infoMessage" : "","electionTime" : Timestamp(1600568196, 1),"electionDate" : ISODate("2020-09-20T02:16:36Z"),"configVersion" : 1,"self" : true,"lastHeartbeatMessage" : ""},{"_id" : 1,"name" : "192.168.100.140:27018","health" : 1,"state" : 2,"stateStr" : "SECONDARY","uptime" : 328,"optime" : {"ts" : Timestamp(1600568512, 2),"t" : NumberLong(1)},"optimeDurable" : {"ts" : Timestamp(1600568512, 2),"t" : NumberLong(1)},"optimeDate" : ISODate("2020-09-20T02:21:52Z"),"optimeDurableDate" : ISODate("2020-09-20T02:21:52Z"),"lastHeartbeat" : ISODate("2020-09-20T02:21:52.907Z"),"lastHeartbeatRecv" : ISODate("2020-09-20T02:21:53.185Z"),"pingMs" : NumberLong(0),"lastHeartbeatMessage" : "","syncingTo" : "192.168.100.140:27017","syncSourceHost" : "192.168.100.140:27017","syncSourceId" : 0,"infoMessage" : "","configVersion" : 1},{"_id" : 2,"name" : "192.168.100.140:27019","health" : 1,"state" : 2,"stateStr" : "SECONDARY","uptime" : 328,"optime" : {"ts" : Timestamp(1600568512, 2),"t" : NumberLong(1)},"optimeDurable" : {"ts" : Timestamp(1600568512, 2),"t" : NumberLong(1)},"optimeDate" : ISODate("2020-09-20T02:21:52Z"),"optimeDurableDate" : ISODate("2020-09-20T02:21:52Z"),"lastHeartbeat" : ISODate("2020-09-20T02:21:52.907Z"),"lastHeartbeatRecv" : ISODate("2020-09-20T02:21:53.185Z"),"pingMs" : NumberLong(0),"lastHeartbeatMessage" : "","syncingTo" : "192.168.100.140:27017","syncSourceHost" : "192.168.100.140:27017","syncSourceId" : 0,"infoMessage" : "","configVersion" : 1}],"ok" : 1,"operationTime" : Timestamp(1600568512, 2),"$clusterTime" : {"clusterTime" : Timestamp(1600568512, 2),"signature" : {"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),"keyId" : NumberLong(0)}}
}> lpf:PRIMARY>        '变为主'> [root@localhost logs]# mongo --port 27018    '切换为18'> lpf:SECONDARY>        '18变为从'> [root@localhost logs]# mongo --port 27017    '切换为17'> lpf:SECONDARY>      '17变为从'> lpf:PRIMARY> rs.status()     '查看复制级状态 ''

• 添加复制集节点

lpf:PRIMARY> rs.add(“192.168.100.140:27020”)
{
“ok” : 1,
“operationTime” : Timestamp(1600568634, 1),
“$clusterTime” : {
“clusterTime” : Timestamp(1600568634, 1),
“signature” : {
“hash” : BinData(0,“AAAAAAAAAAAAAAAAAAAAAAAAAAA=”),
“keyId” : NumberLong(0)
}
}
}

- 删除节点```handlebars
lpf:PRIMARY> rs.remove("192.168.100.140:27020")

2.3: 故障转义自动切换

1.先查看进程

[root@mongodb ~]# ps aux |grep mongod
root      10840  0.5  3.8 1594444 110620 ?      Sl   10:06   0:09 mongod -f /etc/mongod.conf
root      10874  0.5  3.4 1482568 97992 ?       Sl   10:06   0:09 mongod -f /etc/mongod2.conf
root      10908  0.5  3.4 1538984 98320 ?       Sl   10:06   0:09 mongod -f /etc/mongod3.conf
root      10942  0.5  3.2 1466056 93796 ?       Sl   10:06   0:09 mongod -f /etc/mongod4.conf
root      11874  0.0  0.0 112724   988 pts/0    S+   10:34   0:00 grep --color=auto mongod

2.手工结束一个节点，查看自动选举

[root@mongodb ~]# ps aux |grep mongod
root      10840  0.5  3.8 1594444 110620 ?      Sl   10:06   0:09 mongod -f /etc/mongod.conf
root      10874  0.5  3.4 1482568 97992 ?       Sl   10:06   0:09 mongod -f /etc/mongod2.conf
root      10908  0.5  3.4 1538984 98320 ?       Sl   10:06   0:09 mongod -f /etc/mongod3.conf
root      10942  0.5  3.2 1466056 93796 ?       Sl   10:06   0:09 mongod -f /etc/mongod4.conf
root      11874  0.0  0.0 112724   988 pts/0    S+   10:34   0:00 grep --color=auto mongod
[root@mongodb ~]# kill -9 10840
[root@mongodb ~]# mongo --port 27018
lpf:SECONDARY>
[root@mongodb ~]# mongo --port 27019
lpf:SECONDARY>
[root@mongodb ~]# mongo --port 27020
lpf:PRIMARY>
"发现27020节点变为主"

2.4: 手动切换主键

1.设置30s不参与竞选

lpf:PRIMARY> rs.freeze(30)
{"ok" : 0,"errmsg" : "cannot freeze node when primary or running for election. state: Primary","code" : 95,"codeName" : "NotSecondary","operationTime" : Timestamp(1600570363, 1),"$clusterTime" : {"clusterTime" : Timestamp(1600570363, 1),"signature" : {"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),"keyId" : NumberLong(0)}}
}

2.手动切换

交出主节点位置，维持从节点状态不少于60s,等待30s使主节点和从节点日志同步（交换主从）

• lpf:PRIMARY> rs.stepDown(60,30)
  2020-09-20T10:53:40.678+0800 E QUERY    [thread1] Error: error doing query: failed: network error while attempting to run command 'replSetStepDown' on host '127.0.0.1:27020'  :
  DB.prototype.runCommand@src/mongo/shell/db.js:168:1
  DB.prototype.adminCommand@src/mongo/shell/db.js:186:16
  rs.stepDown@src/mongo/shell/utils.js:1404:12
  @(shell):1:1
  2020-09-20T10:53:40.680+0800 I NETWORK  [thread1] trying reconnect to 127.0.0.1:27020 (127.0.0.1) failed
  2020-09-20T10:53:40.681+0800 I NETWORK  [thread1] reconnect 127.0.0.1:27020 (127.0.0.1) ok
  lpf:SECONDARY>
  sha:SECONDARY> rs.status()
  .....{"_id" : 1,"name" : "192.168.100.140:27018","health" : 1,"state" : 1,"stateStr" : "PRIMARY","uptime" : 1821,"optime" : {"ts" : Timestamp(1600570452, 1),"t" : NumberLong(3)},
  "主切换到了27018"
  

三 . 选举复制：

1.标准节点 2.仲裁节点 3.被动节点
通过优先级设点，优先级高的是标准节点，低的是被动节点；最后是仲裁节点
重新创建4个实例

3.1 在实例1中设置优先级

 > cfg={"_id":"lpfs","members":[{"_id":0,"host":"192.168.100.140:27017","priority":100},{"_id":1,"host":"192.168.100.140:27018","priority":100},{"_id":2,"host":"192.168.100.140:27019","priority":0},{"_id":3,"host":"192.168.100.140:27020","arbiterOnly":true}]}> rs.initiate(cfg)

3.2: 查看各节点之间的身份

lpfs:SECONDARY> rs.isMaster()
{"hosts" : ["192.168.100.140:27017",          //标准节点"192.168.100.140:27018"],"passives" : ["192.168.100.140:27019"                //被动节点],"arbiters" : ["192.168.100.140:27020"               //仲裁节点],"setName" : "lpfs","setVersion" : 1,"ismaster" : true,"secondary" : false,"primary" : "192.168.100.140:27017","me" : "192.168.100.140:27017","electionId" : ObjectId("7fffffff0000000000000001"),"
lpfs:PRIMARY>

3.3: 常规操作添加数据

lpfs:PRIMARY>  use test       ##使用test库
switched to db test
lpfs:PRIMARY> db.t1.insert({"id":1,"name":"jack"})               #创建id为1的“jack”用户
WriteResult({ "nInserted" : 1 })
lpfs:PRIMARY> db.t1.insert({"id":2,"name":"tom"})                 #创建id为2的“tom”用户
WriteResult({ "nInserted" : 1 })
lpfs:PRIMARY> db.t1.find()
{ "_id" : ObjectId("5f5c987603a23cf20b5905e0"), "id" : 1, "name" : "jack" }
{ "_id" : ObjectId("5f5c988203a23cf20b5905e1"), "id" : 2, "name" : "tom" }
修改数据
lpfs:PRIMARY> db.t1.update({"id":1},{$set:{"name":"jerrt"}})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
lpfs:PRIMARY> db.t1.find()
{ "_id" : ObjectId("5f5c987603a23cf20b5905e0"), "id" : 1, "name" : "jerrt" }
{ "_id" : ObjectId("5f5c988203a23cf20b5905e1"), "id" : 2, "name" : "tom" }
删除数据
lpfs:PRIMARY> db.t1.remove({"id":2})
WriteResult({ "nRemoved" : 1 })
lpfs:PRIMARY> db.t1.find()
{ "_id" : ObjectId("5f5c987603a23cf20b5905e0"), "id" : 1, "name" : "jerrt" }
lpfs:PRIMARY>
查看日志文件
lpfs:PRIMARY> show dbs
admin   0.000GB
config  0.000GB
local   0.000GB    //##local库存放的日志
test    0.000GB
lpfs:PRIMARY> use local
switched to db local
lpfs:PRIMARY> show collections          ##查看集合
oplog.rs                                   ##存放了日志信息
replset.election
replset.minvalid
replset.oplogTruncateAfterPoint
startup_log
lpfs:PRIMARY> db.oplog.rs.find()    ##这个命令可以查看日志记录
{ "ts" : Timestamp(1599903569, 1), "h" : NumberLong("2054745077148917962"),

3.4 模拟节点故障查看选举情况

mongod -f /etc/mongod.conf --shutdown     ##将主节点宕机
mongo --port 27018                      ##用主键中的27018去登录
MongoDB shell version v4.0.0
connecting to: mongodb://127.0.0.1:27018/
MongoDB server version: 4.0.0
Server has startup warnings:lpfs:PRIMARY> exit     发现27018变为主键
bye
#这时将27018也宕机，查看27019会不会参与选举
mongod -f /etc/mongod2.conf --shutdown    ##发现27019不参与选举
lpfs:SECONDARY> exit
bye

3.5 再次将27017恢复，发现主节点依然是他

mongod -f /etc/mongod.confmongolpfs:PRIMARY> exit
byemongod -f /etc/mongod2.conf

3.6 允许从节点去主节点同步信息

mongo --port 27018    ##登录到27018节点上
MongoDB shell version v4.0.0
connecting to: mongodb://127.0.0.1:27018/
MongoDB server version: 4.0.0
Server has startup warnings:lpfs:SECONDARY> show dbs     ##发现查看不到数据库信息
2020-09-20T17:51:17.180+0800 E QUERY    [js] Error: listDatabases failed:{"operationTime" : Timestamp(1599904272, 1),"ok" : 0,"errmsg" : "not master and slaveOk=false","code" : 13435,"codeName" : "NotMasterNoSlaveOk","$clusterTime" : {"clusterTime" : Timestamp(1599904272, 1),"signature" : {"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),"keyId" : NumberLong(0)}}
} :
_getErrorWithCode@src/mongo/shell/utils.js:25:13
Mongo.prototype.getDBs@src/mongo/shell/mongo.js:65:1
shellHelper.show@src/mongo/shell/utils.js:865:19
shellHelper@src/mongo/shell/utils.js:755:15
@(shellhelp2):1:1shars:SECONDARY> rs.slaveOk()     ##允许从节点去读取信息
shars:SECONDARY> show dbs     查询到了结果数据库信息
admin   0.000GB
config  0.000GB
local   0.000GB
test    0.000GB

lpfs:SECONDARY> rs.printReplicationInfo()      ##查看日志文件大小
configured oplog size:   4329.4130859375MB    ##日志文件大小为4329MB
log length start to end: 803secs (0.22hrs)
oplog first event time:  Sat Sep 20 2020 17:39:29 GMT+0800 (CST)
oplog last event time:   Sat Sep 20 2020 17:52:52 GMT+0800 (CST)
now:                     Sat Sep 20 2020 17:52:59 GMT+0800 (CST)
lpfs:SECONDARY>  rs.printSlaveReplicationInfo()    ##查看哪些节点可以找主节点同步
source: 192.168.100.20:27018syncedTo: Sat Sep 20 2020 17:53:12 GMT+0800 (CST)-10 secs (0 hrs) behind the primary
source: 192.168.100.20:27019syncedTo: Sat Sep 20 2020 17:53:02 GMT+0800 (CST)0 secs (0 hrs) behind the primary
lpfs:SECONDARY>
仲裁节点不会去找主节点同步信息

3.7 离线升级， 更改日志文件大小

1. 关闭 27018 的服务

lpfs:SECONDARY> use admin
switched to db admin
shars:SECONDARY> db.shutdownServer()
server should be down...
2020-09-20T17:55:03.820+0800 I NETWORK  [js] trying reconnect to 127.0.0.1:27018 failed
2020-09-20T17:55:03.820+0800 I NETWORK  [js] reconnect 127.0.0.1:27018 failed failed
2020-09-20T17:55:03.823+0800 I NETWORK  [js] trying reconnect to 127.0.0.1:27018 failed
2020-09-20T17:55:03.823+0800 I NETWORK  [js] reconnect 127.0.0.1:27018 failed failed
> exit
byeshars:PRIMARY> rs.help()    查看命令帮助信息

2.将配置文件信息注释

[root@localhost logs]# vim /etc/mongod2.conf
net:port: 27028    ##将端口号改为27028bindIp: 0.0.0.0  # Listen to local interface only, comment to listen on all interfaces.
#replication:                     ##将参数注销
#     replSetName: shars

[root@pc-2 mongodb]# vim /etc/mongod2.conf
[root@pc-2 mongodb]# mongod -f /etc/mongod2.conf
2020-09-12T17:58:27.287+0800 I CONTROL  [main] Automatically disabling TLS 1.0, toforce-enable TLS 1.0 specify --sslDisabledProtocols 'none'
about to fork child process, waiting until server is ready for connections.
forked process: 20417
child process started successfully, parent exiting
[root@pc-2 mongodb]# mongodump --port 27028 --db local --collection 'oplog.rs'    ##备份日志信息
2020-09-12T17:58:47.952+0800   writing local.oplog.rs to
2020-09-12T17:58:47.954+0800   done dumping local.oplog.rs (94 documents)
[root@pc-2 mongodb]# mongo --port 27028  重新登录
MongoDB shell version v4.0.0
connecting to: mongodb://127.0.0.1:27028/
MongoDB server version: 4.0.0
Server has startup warnings:> use local
switched to db local      ##使用local库
> show tables
oplog.rs
replset.election
replset.minvalid
replset.oplogTruncateAfterPoint
startup_log
> db.oplog.rs.drop()    ##将日志库删除
true
> db.run
local.run
>  db.runCommand( { create: "oplog.rs", capped: true, size: (2 * 1024 * 1024) } )          ##重建日志信息库
{ "ok" : 1 }
> use admin      ##改完之后将服务停止
switched to db admin
> db.shutdownServer()
server should be down...
2020-09-12T18:00:45.909+0800 I NETWORK  [js] trying reconnect to 127.0.0.1:27028 failed
2020-09-12T18:00:45.909+0800 I NETWORK  [js] reconnect 127.0.0.1:27028 failed failed

3.修改配置文件，将注释取消，修改端口号

[root@pc-2 mongodb]# vim /etc/mongod2.conf# network interfaces
net:port: 27018bindIp: 0.0.0.0   # Enter 0.0.0.0,:: to bind to all IPv4 and IPv6 addresses or, alternatively, use the net.bindIpAll setting.#security:#operationProfiling:replication:replSetName: sharsoplogSizeMB: 2048         ##添加日志库大小为2048M

4.重启服务

root@pc-2 mongodb]# mongod -f /etc/mongod2.conf  --shutdown[root@pc-2 mongodb]# mongod -f /etc/mongod2.conf

5. 登录 27018

[root@pc-2 mongodb]# mongo --port 27018
MongoDB shell version v4.0.0shars:SECONDARY>  rs.printReplicationInfo()      ##查看文件大小
configured oplog size:   2MB    ///修改成功 2Mlog length start to end: 20secs (0.01hrs)
oplog first event time:  Sat Sep 12 2020 18:04:52 GMT+0800 (CST)
oplog last event time:   Sat Sep 12 2020 18:05:12 GMT+0800 (CST)
now:                     Sat Sep 12 2020 18:05:12 GMT+0800 (CST)
shars:SECONDARY>

3.8 将主位让出

##登录到主节点上
[root@pc-2 mongodb]# mongo
MongoDB shell version v4.0.0
##将主位让出
shars:PRIMARY> rs.stepDown()
2020-09-12T18:06:27.019+0800 E QUERY    [js] 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:168:1
DB.prototype.adminCommand@src/mongo/shell/db.js:186:16
rs.stepDown@src/mongo/shell/utils.js:1398:12
@(shell):1:1
2020-09-12T18:06:27.021+0800 I NETWORK  [js] trying reconnect to 127.0.0.1:27017 failed
2020-09-12T18:06:27.022+0800 I NETWORK  [js] reconnect 127.0.0.1:27017 ok
shars:SECONDARY> exit
bye##再次登陆的27018节点上
[root@pc-2 mongodb]# mongo --port 27018
MongoDB shell version v4.0.0shars:PRIMARY>     ##27018变为主节点

四: 部署秘钥认证复制

shars:PRIMARY> use admin
switched to db admin
shars:PRIMARY> db.createUser({"user":"root","pwd":"123","roles":["root"]})
Successfully added user: { "user" : "root", "roles" : [ "root" ] }
shars:PRIMARY> exit
bye

4.1 修改配置文件

[root@pc-2 mongodb]# vim /etc/mongod.conf
[root@pc-2 mongodb]# vim /etc/mongod2.conf
[root@pc-2 mongodb]# vim /etc/mongod3.conf
[root@pc-2 mongodb]# vim /etc/mongod4.conf

"添加"
security:keyFile: /usr/bin/sharskey1        ##验证路径clusterAuthMode: keyFile          ##密钥文件验证security:keyFile: /usr/bin/sharskey2clusterAuthMode: keyFilesecurity:keyFile: /usr/bin/sharskey3clusterAuthMode: keyFilesecurity:keyFile: /usr/bin/sharskey4clusterAuthMode: keyFile

4.2 写入4个密钥文件

[root@localhost logs]# cd /usr/bin/
[root@localhost bin]# echo "shars key" > sharskey1
[root@localhost bin]# echo "shars key" >sharskey2
[root@localhost bin]# echo "shars key" > sharskey3
[root@localhost bin]# echo "shars key" > sharskey4
[root@localhost bin]# chmod 600 sha*    ##将文件权限改为600

4.3 登录 27018 测试

[root@pc-2 bin]# mongo --port 27018
MongoDB shell version v4.0.0
connecting to: mongodb://127.0.0.1:27018/
MongoDB server version: 4.0.0
shars:SECONDARY> exit
bye
[root@pc-2 bin]# mongo --port 27017
MongoDB shell version v4.0.0
connecting to: mongodb://127.0.0.1:27017/
MongoDB server version: 4.0.0
shars:PRIMARY> show dbs    //  登录到主位节点，验证认证测试
2020-09-12T18:29:51.682+0800 E QUERY    [js] Error: listDatabases failed:{"operationTime" : Timestamp(1599906589, 1),"ok" : 0,"errmsg" : "command listDatabases requires authentication","code" : 13,"codeName" : "Unauthorized","$clusterTime" : {"clusterTime" : Timestamp(1599906589, 1),"signature" : {"hash" : BinData(0,"AStJmqe4VFYS0OmsYUypbImu66o="),"keyId" : NumberLong("6871533557148286977")}}
} :
_getErrorWithCode@src/mongo/shell/utils.js:25:13
Mongo.prototype.getDBs@src/mongo/shell/mongo.js:65:1
shellHelper.show@src/mongo/shell/utils.js:865:19
shellHelper@src/mongo/shell/utils.js:755:15
@(shellhelp2):1:1
shars:PRIMARY> use admin
switched to db admin
shars:PRIMARY> db.auth("root","123")        ##用root身份去登录
1
shars:PRIMARY> show dbs      ##可以查看数据库信息了
admin   0.000GB
config  0.000GB
local   0.000GB
test    0.000GB
shars:PRIMARY>
从位的节点都需要登录root用户才可以查看数据库信息

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