环境介绍：

192.168.1.250 主  port=27408

192.168.1.250 仲裁 port=27409

192.168.1.251 备  port=27408

[root@HE4 ~]# tar xvf mongodb-linux-x86_64-2.6.10.tgz

[root@HE4 ~]# mkdir -p /export/mongodb

[root@HE4 ~]# mkdir -p /export/mongodb/bin

[root@HE4 ~]# mkdir -p /export/mongodb/conf

[root@HE4 ~]# mkdir -p /export/mongodb/log

[root@HE4 ~]# mkdir -p /export/mongodb/data

[root@HE4 bin]# cd /root/mongodb-linux-x86_64-2.6.10/bin

[root@HE4 bin]# cp /root/mongodb-linux-x86_64-2.6.10/bin/* /export/mongodb/bin/

[root@HE1 bin]# vi /export/mongodb/conf/mongod.conf

port=27408
dbpath=/export/mongodb/data
logpath=/export/mongodb/log/mongod.log
fork=true
logappend=true
keyFile=/export/mongodb/key/mongod
nohttpinterface=true
replSet=shard1
[root@HE1 bin]# vi /export/mongodb/conf/arbiter.conf
port=27409
dbpath=/export/mongodb/arbiter
logpath=/export/mongodb/log/arbiter.log
fork=true
logappend=true
keyFile=/export/mongodb/key/arbiter
nohttpinterface=true
replSet=shard1

keyfile文件包括:

mongod，arbiter

创建一个生成keyfile的脚本

vi create_key.sh

cat /dev/urandom | LC_ALL=C tr -dc "[:alnum:]" | fold -w 10 |head -1 >/tmp/key.txt
keystring=`cat /tmp/key.txt`
echo $keystring >/export/mongodb/key/mongod
echo $keystring >/export/mongodb/key/arbiter
chmod 600 /export/mongodb/key/*

启动服务器在主

[root@HE3 ~]#/export/mongodb/bin/mongod -f /export/mongodb/conf/mongod.conf

[root@HE3 ~]# /export/mongodb/bin/mongod -f /export/mongodb/conf/arbiter.conf

在从

[root@HE4 ~]#/export/mongodb/bin/mongod -f /export/mongodb/conf/mongod.conf

>config={_id:'shard1',members:[{_id:0,host:'192.168.1.248:27408'},{_id:1,host:'192.168.1.249:27408'},{_id:2,host:'192.168.1.248:27409',arbiterOnly:true}]}

>rs.initiate(config)

初始化rs.initiate(config)，config是之前定义的名

主备库配置好后，备库查询

shard1:SECONDARY> use test
switched to db test
shard1:SECONDARY> db.t1.find()
error: { "$err" : "not master and slaveOk=false", "code" : 13435 }
shard1:SECONDARY> rs.slaveOk()
shard1:SECONDARY> db.t1.find()
{ "_id" : ObjectId("5704c11d3e0651733bfdea23"), "x" : 1 }

rs.stauts()可以看状态，health:1代表健康，stateStr谁是我们的仲裁

想让主库降级成从库，rs.stepDown()