搭建前准备
MongoDB版本:4.0
主要参考搭建MongoDB副本集网站:https://www.jianshu.com/p/f021f1f3c60b
安装之前最好先确定一下几点:
-
- 防火墙关闭
- MongoDB的端口号对需要访问你的服务器开放
相关linux命令可参考博客https://www.cnblogs.com/yanduanduan/p/6396631.html
在安装的过程中,可以说遇到问题多多,下面就介绍一下问题情况,以及解决方法:
问题一(连接被拒绝):
{ "operationTime" : Timestamp(0, 0), "ok" : 0, "errmsg" : "replSetInitiate quorum check failed because not all proposed set members responded affirmatively: 10.xx.xx.xx:27018 failed with Error connecting to 10.xx.xx.xx:27018 :: caused by :: Connection refused, 10.xx.xx.xx:27018 failed with Error connecting to 10.xx.xx.xx:27018 :: caused by :: Connection refused", "code" : 74, "codeName" : "NodeNotFound", "$clusterTime" : { "clusterTime" : Timestamp(0, 0), "signature" : { "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="), "keyId" : NumberLong(0) } } }
原因:
没有指定本机IP,默认是127.0.0.1;
解决方法:
在mongo.conf配置文件中,加上bind_ip=本机IP即可;
问题二(文件权限过大):
permissions on /root/mongodb/keyfile are too open
原因:
我指定的keyFile=/root/mongodb/keyfile/keyfile路径少写了文件“keyfile”,仅指定到文件夹“keyfile”,所以不管我怎么减少权限,都不行。
解决方法:
补全keyfile文件的路径
keyFile=/root/mongodb/keyfile/keyfile
问题三(查看成员状态失败):
replSet:PRIMARY> rs.status() { "operationTime" : Timestamp(1553750837, 1), "ok" : 0, "errmsg" : "not authorized on admin to execute command { replSetGetStatus: 1.0, lsid: { id: UUID("49593e29-481a-4765-a7ad-2b1ca5a8fbcf") }, $clusterTime: { clusterTime: Timestamp(1553750837, 1), signature: { hash: BinData(0, BAD749F5F3799A6EDEB97259390BD616FF6A9F5D), keyId: 6673011308209635329 } }, $db: "admin" }", "code" : 13, "codeName" : "Unauthorized", "$clusterTime" : { "clusterTime" : Timestamp(1553750837, 1), "signature" : { "hash" : BinData(0,"utdJ9fN5mm7euXJZOQvWFv9qn10="), "keyId" : NumberLong("6673011308209635329") } } }
原因:
由于开启了权限验证,即“auth=true”,所以查看状态之前,需要先认证。
解决方法:
replSet:PRIMARY> use admin switched to db admin replSet:PRIMARY> db.auth('admin','admin') 1 replSet:PRIMARY> rs.status()
问题四(插入数据失败):
replSet:PRIMARY> db.admin.insert({"name":"zhangsan"}) WriteCommandError({ "operationTime" : Timestamp(1553752333, 1), "ok" : 0, "errmsg" : "not authorized on admin to execute command { insert: "admin", ordered: true, lsid: { id: UUID("fa7499f8-f4be-4059-a713-0a2dd2ddbcc7") }, $clusterTime: { clusterTime: Timestamp(1553752333, 1), signature: { hash: BinData(0, 77558A08F8FF8235DF3CD87E13C2771943EBBDE0), keyId: 6673011308209635329 } }, $db: "admin" }", "code" : 13, "codeName" : "Unauthorized", "$clusterTime" : { "clusterTime" : Timestamp(1553752333, 1), "signature" : { "hash" : BinData(0,"d1WKCPj/gjXfPNh+E8J3GUPrveA="), "keyId" : NumberLong("6673011308209635329") } } })
原因:
没有按照以下原则进行:
- 数据库和用户是绑定的,光创建一个超级用户并不能操作在其他新建的数据库中插入数据
- 在切换数据库时,先切换认证用户,不然会出现too many users are authenticated的错误。
解决方法:
1. 输入use admin,进入admin数据库,root用户需要在admin数据库中认证。
2. 输入db.auth('root','root')超级用户进行认证
3. 输入db.createUser({user: "okevin",pwd: "123456",roles: [ { role: "readWrite", db: "recommended" } ]} )创建okevin用户,并为它指定数据库为recommended。
4. 输入db.auth('okevin','123456')切换认证用户。
5. 输入use recommended切换至recommended数据库
6. 输入db.repo.insert({"name":"kevin"}),创建一条数据。
主要参考网址:http://www.cnblogs.com/yulinfeng/p/10226977.html
问题五(创建用户失败):
replSet:PRIMARY> db.createUser({user:"test", pwd:"test", roles:[{role: "userAdminAnyDatabase", db:"test" }]}) 2019-03-28T13:56:08.968+0800 E QUERY [js] Error: couldn't add user: No role named userAdminAnyDatabase@test : _getErrorWithCode@src/mongo/shell/utils.js:25:13 DB.prototype.createUser@src/mongo/shell/db.js:1491:15
原因:
在db.createUser()方法中roles里面的db必须写成是admin库。
解决方法:
将db的值改为admin
db.createUser({user:"test", pwd:"test", roles:[{role: "userAdminAnyDatabase", db:"admin" }]})
可参考网址:https://blog.csdn.net/jianlong727/article/details/53889990
问题六(从节点读取主节点数据失败):
019-03-28T14:43:13.643+0800 E QUERY [js] Error: not master and slaveOk=false : _getErrorWithCode@src/mongo/shell/utils.js:25:13 DB.prototype.getUsers@src/mongo/shell/db.js:1763:1 shellHelper.show@src/mongo/shell/utils.js:859:9 shellHelper@src/mongo/shell/utils.js:766:15 @(shellhelp2):1:1
原因:
这是正常的,默认情况下,主节点有读写权限,从节点是没有读写权限的。
解决方法:
通过命令进行设置
rs.slaveOk()
读写权限设置可参考网址:
https://blog.csdn.net/u011191463/article/details/68485529
配置完成后,Java连接池配置,可参考: