mongodb 3.4复制集配置

1：启动三个实例

/home/maxiangqian/mongodb-linux-x86_64-rhel62-3.4.2/bin/mongod --config /home/mongodb/db27017/mongodb27017.conf
/home/maxiangqian/mongodb-linux-x86_64-rhel62-3.4.2/bin/mongod --config /home/mongodb/db27018/mongodb27018.conf
/home/maxiangqian/mongodb-linux-x86_64-rhel62-3.4.2/bin/mongod --config /home/mongodb/db27019/mongodb27019.conf

2：为每个实例配置超级管理员账号：maxiangqian

use admin
db.createUser(
{
user: "maxiangqian",
pwd: "maxiangqian",
roles: [ { role: "root", db: "admin" } ]
}
)

然后使用验证登录

use admin
db.auth("maxiangqian","maxiangqian")
db.shutdownServer()

3:重启mongodb数据库以复制集的形式启动mongodb数据库

mongod -f /home/mongodb/db27017/mongodb27017.conf
mongod -f /home/mongodb/db27018/mongodb27018.conf
mongod -f /home/mongodb/db27019/mongodb27019.conf

4：登入27017mongodb数据库进行初始化：

mongo localhost:27017
配置主节点：
rsconf = { _id: "rsmxqtest", members: [ { _id: 0,host: "localhost:27017" } ] }
再进行初始化：
> rs.initiate()
进行验证：
rs.conf()
添加一个节点：
rs.add("localhost:27018")

嗯？报错了，什么鬼，看一下报错信息：

rsmxqtest:PRIMARY> rs.add("localhost:27018")
{
"ok" : 0,
"errmsg" : "Quorum check failed because not enough voting nodes responded; required 2 but only the following 1 voting nodes responded: localhost.localdomain:27017; the following nodes did not respond affirmatively: localhost:27018 failed with not authorized on admin to execute command { replSetHeartbeat: \"rsmxqtest\", pv: 1, v: 2, from: \"localhost.localdomain:27017\", fromId: 0, checkEmpty: false }",
"code" : 74,
"codeName" : "NodeNotFound"
}
意思就是没有权限，复制集之间的互联也是需要验证的，所以要配置keyfile来满足这个需求，如果开启了 authorization ，投票节点通过证书的形式与复制集中其他节点进行认证。MongoDB的身份认证过程是加密的。MongoDB的认证交互是通过密码进行的
5：创建一个keyfile,并且拷贝到其他从节点

openssl rand -base64 756 > /home/mongodb/db27017/key/autokey
chmod 400 /home/mongodb/db27017/key/autokey

然后进行拷贝并且查看文件：

[root@localhost key]# cp /home/mongodb/db27017/key/autokey /home/mongodb/db27018/key/autokey
[root@localhost key]# cp /home/mongodb/db27017/key/autokey /home/mongodb/db27019/key/autokey
[root@localhost key]# ls -ll /home/mongodb/db27018/key/
total 4
-r-------- 1 root root 1024 Mar 14 16:32 autokey
[root@localhost key]# ls -ll /home/mongodb/db27019/key/
total 4
-r-------- 1 root root 1024 Mar 14 16:33 autokey

6：以keyFile 参数启动mongodb数据库

首先我们在三个数据库的配置文件添加以下信息：

keyFile = /home/mongodb/db27017/key/autokey
keyFile = /home/mongodb/db27018/key/autokey
keyFile = /home/mongodb/db27019/key/autokey

重启三台mongodb数据库

db.shutdownServer()
mongod -f /home/mongodb/db27017/mongodb27017.conf
mongod -f /home/mongodb/db27018/mongodb27018.conf
mongod -f /home/mongodb/db27019/mongodb27019.conf

7：登录主节点27017节点，然后进行操作添加节点

[root@localhost tmp]# mongo localhost:27017
MongoDB shell version v3.4.2
connecting to: localhost:27017
MongoDB server version: 3.4.2
rsmxqtest:PRIMARY> use admin
switched to db admin
rsmxqtest:PRIMARY> db.auth("maxiangqian","maxiangqian")

开始添加节点

rsmxqtest:PRIMARY> rs.add("localhost:27018")
{ "ok" : 1 }

显示添加成功，然后添加一个投票节点（投票节点是不保存数据的，只是作为投票使用）

rsmxqtest:PRIMARY> rs.addArb("localhost:27019")
{ "ok" : 1 }

显示添加成功，然后验证看一下节点状态：

rs.status()
rs.conf()

打印的消息就不打印贴出来了，有点太长了。

OK，现在一个keyfile的验证复制集（一主一从一投票）已经配置完了，我们现在开始验证一下复制集：
（1）主节点添加一条数据27017

rsmxqtest:PRIMARY> use maxiangqian
switched to db maxiangqian
rsmxqtest:PRIMARY> db.maxiangqian.insert({"name":"maxiangqian"})
WriteResult({ "nInserted" : 1 })
rsmxqtest:PRIMARY> db.maxiangqian.find().pretty()
{ "_id" : ObjectId("58c7b0c0088625cf734503ae"), "name" : "maxiangqian" }

（2）登录从节点验证数据27018

rsmxqtest:SECONDARY> use admin
switched to db admin
rsmxqtest:SECONDARY> db.auth("maxiangqian","maxiangqian")
1
rsmxqtest:SECONDARY> rs.slaveOk()
rsmxqtest:SECONDARY> show dbs
admin 0.000GB
local 0.000GB
maxiangqian 0.000GB
rsmxqtest:SECONDARY> use maxiangqian
switched to db maxiangqian
rsmxqtest:SECONDARY> db.maxiangqian.find().pretty()
{ "_id" : ObjectId("58c7b0c0088625cf734503ae"), "name" : "maxiangqian" }

可以看得到，复制集的功能已经完成了，数据也已经同步了。投票节点是不存储数据的，所以我们就不需要去验证数据了。