配置mongodb 复制集3.2

我们这里讲解的是如何配置mongodb复制集,首先在每一个机器上面安装mongodb,我们是通过yum的方式安装mongodb3.2

1.在文章中添加yum安装的配置文件:

touch /etc/yum.repos.d/mongodb-org-3.2.repo
vim /etc/yum.repos.d/mongodb-org-3.2.repo

打开文件后里面添加内容:

[mongodb-org-3.2]  
name=MongoDB Repository  
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.2/x86_64/  
gpgcheck=1  
enabled=1  
gpgkey=https://www.mongodb.org/static/pgp/server-3.2.asc

2.yum安装

sudo yum install -y mongodb-org

其他节点也进行进行上面的步骤,将其他的节点按照上面,进行安装mongodb,安装完成后,都关闭mongodb:

sudo service mongod stop

3. 在每一个mongodb的节点,修改hosts

节点:192.168.220.105  mongo0.example.com

节点:192.168.220.106 mongo1.example.com

vim /etc/hosts

192.168.220.105:在上面打开的文件中添加或修改:

127.0.0.1   localhost mongo0.example.com  
192.168.220.105 mongo0.example.com  
192.168.220.106 mongo1.example.com

192.168.220.106:在上面文件中添加或者修改:

127.0.0.1   localhost mongo1.example.com  
192.168.220.105 mongo0.example.com  
192.168.220.106 mongo1.example.com

 

4. 在每一个mongodb的节点,修改hostname

节点:192.168.220.105  mongo0.example.com

节点:192.168.220.106 mongo1.example.com

192.168.220.105:

sudo hostname mongo0.example.com  
vim   /etc/hostname
#在打开的文件中添加: 
mongo0.example.com

192.168.220.106:

sudo hostname mongo1.example.com  
vim   /etc/hostname 
mongo1.example.com

5.修改mongodb的配置  vim /etc/mongod.conf

进行的修改为: 把bingIp注释掉,因为这一行只让本地访问:

net:  
  port: 27017  
#  bindIp: 127.0.0.1  # Listen to local interface only, comment to listen on all interfaces.

添加复制集配置:

replication:  
   replSetName: rs0

编辑完的内容为:

# mongod.conf

# for documentation of all options, see:
#   http://docs.mongodb.org/manual/reference/configuration-options/

# where to write logging data.
systemLog:
  destination: file
  logAppend: true
  path: /var/log/mongodb/mongod.log

# Where and how to store data.
storage:
  dbPath: /var/lib/mongo
  journal:
    enabled: true
#  engine:
#  mmapv1:
#  wiredTiger:

# how the process runs
processManagement:
  fork: true  # fork and run in background
  pidFilePath: /var/run/mongodb/mongod.pid  # location of pidfile

# network interfaces
net:
  port: 27017
#  bindIp: 127.0.0.1  # Listen to local interface only, comment to listen on all interfaces.

#security:

#operationProfiling:

replication:
   replSetName: rs0
#sharding:

## Enterprise-Only Options

#auditLog:

#snmp:

保存文件后,重启linxu。

添加开机启动

chkconfig mongod on

启动mongodb:

/etc/init.d/mongod restart

 

8.现在有两台linux,现在开始配置,注意,只能进入一台mongodb,其他的mongdb不要配置,启动就好。

在mongo0中:(这个作为主节点)

mongo

执行log如下:

[root@mongo0 ~]# mongo  
MongoDB shell version: 3.2.7  
connecting to: test  
Server has startup warnings:   
2016-06-20T14:10:48.876+0800 I CONTROL  [initandlisten]   
2016-06-20T14:10:48.876+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.  
2016-06-20T14:10:48.876+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'  
2016-06-20T14:10:48.876+0800 I CONTROL  [initandlisten]   
2016-06-20T14:10:48.876+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.  
2016-06-20T14:10:48.876+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'  
2016-06-20T14:10:48.876+0800 I CONTROL  [initandlisten]   
2016-06-20T14:10:48.876+0800 I CONTROL  [initandlisten] ** WARNING: soft rlimits too low. rlimits set to 1024 processes, 64000 files. Number of processes should be at least 32000 : 0.5 times number of files.  
2016-06-20T14:10:48.876+0800 I CONTROL  [initandlisten]

然后初始化:(注意,从节点不要执行rs.initiate()  , 只有主节点执行这个)

rs.initiate()

log如下:

rs.initiate()  
{  
    "info2" : "no configuration specified. Using a default configuration for the set",  
    "me" : "mongo0.example.com:27017",  
    "ok" : 1  
}  
rs0:OTHER>

增加节点:(在主节点中执行,添加从节点,主要从节点的iptables要添加信任,如果是本地,则可以直接关掉iptables,最好是添加ip信任,添加ip信任的方式

/sbin/iptables -I INPUT -p tcp --dport 27017 -j ACCEPT
/etc/rc.d/init.d/iptables save

rs0:OTHER> rs.add("mongo1.example.com:27017");  
{ "ok" : 1 }

rs.config() 查看配置,log如下:

rs0:PRIMARY> rs.config();  
{  
    "_id" : "rs0",  
    "version" : 2,  
    "protocolVersion" : NumberLong(1),  
    "members" : [  
        {  
            "_id" : 0,  
            "host" : "mongo0.example.com:27017",  
            "arbiterOnly" : false,  
            "buildIndexes" : true,  
            "hidden" : false,  
            "priority" : 1,  
            "tags" : {  
                  
            },  
            "slaveDelay" : NumberLong(0),  
            "votes" : 1  
        },  
        {  
            "_id" : 1,  
            "host" : "mongo1.example.com:27017",  
            "arbiterOnly" : false,  
            "buildIndexes" : true,  
            "hidden" : false,  
            "priority" : 1,  
            "tags" : {  
                  
            },  
            "slaveDelay" : NumberLong(0),  
            "votes" : 1  
        }  
    ],  
    "settings" : {  
        "chainingAllowed" : true,  
        "heartbeatIntervalMillis" : 2000,  
        "heartbeatTimeoutSecs" : 10,  
        "electionTimeoutMillis" : 10000,  
        "getLastErrorModes" : {  
              
        },  
        "getLastErrorDefaults" : {  
            "w" : 1,  
            "wtimeout" : 0  
        },  
        "replicaSetId" : ObjectId("5767896cd1595b8f30b7cd4a")  
    }  
}

查看状态:

rs0:PRIMARY> rs.status()

如果后续添加节点,那么,安装完mongodb,设置完成mongodb后,启动mongodb后,设置完成hosts后,直接在主节点中执行添加:

执行log如下:

rs0:PRIMARY> rs.add("mongo2.example.com:27017");
{ "ok" : 1 }
rs0:PRIMARY> rs.status
function () {
    return db._adminCommand("replSetGetStatus");
}
rs0:PRIMARY> rs.status();
{
  "set" : "rs0",
  "date" : ISODate("2016-10-08T02:45:54.068Z"),
  "myState" : 1,
  "term" : NumberLong(19),
  "heartbeatIntervalMillis" : NumberLong(2000),
  "members" : [
    {
      "_id" : 0,
      "name" : "mongo0.example.com:27017",
      "health" : 1,
      "state" : 1,
      "stateStr" : "PRIMARY",
      "uptime" : 1126,
      "optime" : {
        "ts" : Timestamp(1475894744, 1),
        "t" : NumberLong(19)
      },
      "optimeDate" : ISODate("2016-10-08T02:45:44Z"),
      "electionTime" : Timestamp(1475894303, 1),
      "electionDate" : ISODate("2016-10-08T02:38:23Z"),
      "configVersion" : 3,
      "self" : true
    },
    {
      "_id" : 1,
      "name" : "mongo1.example.com:27017",
      "health" : 1,
      "state" : 2,
      "stateStr" : "SECONDARY",
      "uptime" : 617,
      "optime" : {
        "ts" : Timestamp(1475894744, 1),
        "t" : NumberLong(19)
      },
      "optimeDate" : ISODate("2016-10-08T02:45:44Z"),
      "lastHeartbeat" : ISODate("2016-10-08T02:45:52.842Z"),
      "lastHeartbeatRecv" : ISODate("2016-10-08T02:45:52.847Z"),
      "pingMs" : NumberLong(0),
      "syncingTo" : "mongo0.example.com:27017",
      "configVersion" : 3
    },
    {
      "_id" : 2,
      "name" : "mongo2.example.com:27017",
      "health" : 0,
      "state" : 8,
      "stateStr" : "(not reachable/healthy)",
      "uptime" : 0,
      "optime" : {
        "ts" : Timestamp(0, 0),
        "t" : NumberLong(-1)
      },
      "optimeDate" : ISODate("1970-01-01T00:00:00Z"),
      "lastHeartbeat" : ISODate("2016-10-08T02:45:52.842Z"),
      "lastHeartbeatRecv" : ISODate("1970-01-01T00:00:00Z"),
      "pingMs" : NumberLong(0),
      "lastHeartbeatMessage" : "No route to host",
      "configVersion" : -1
    }
  ],
  "ok" : 1
}
rs0:PRIMARY> 

 

 

日志:

rs0:PRIMARY> rs.status()  
{  
    "set" : "rs0",  
    "date" : ISODate("2016-06-20T06:14:17.377Z"),  
    "myState" : 1,  
    "term" : NumberLong(1),  
    "heartbeatIntervalMillis" : NumberLong(2000),  
    "members" : [  
        {  
            "_id" : 0,  
            "name" : "mongo0.example.com:27017",  
            "health" : 1,  
            "state" : 1,  
            "stateStr" : "PRIMARY",  
            "uptime" : 92,  
            "optime" : {  
                "ts" : Timestamp(1466403201, 1),  
                "t" : NumberLong(1)  
            },  
            "optimeDate" : ISODate("2016-06-20T06:13:21Z"),  
            "infoMessage" : "could not find member to sync from",  
            "electionTime" : Timestamp(1466403181, 1),  
            "electionDate" : ISODate("2016-06-20T06:13:01Z"),  
            "configVersion" : 2,  
            "self" : true  
        },  
        {  
            "_id" : 1,  
            "name" : "mongo1.example.com:27017",  
            "health" : 1,  
            "state" : 2,  
            "stateStr" : "SECONDARY",  
            "uptime" : 55,  
            "optime" : {  
                "ts" : Timestamp(1466403201, 1),  
                "t" : NumberLong(1)  
            },  
            "optimeDate" : ISODate("2016-06-20T06:13:21Z"),  
            "lastHeartbeat" : ISODate("2016-06-20T06:14:15.784Z"),  
            "lastHeartbeatRecv" : ISODate("2016-06-20T06:14:14.010Z"),  
            "pingMs" : NumberLong(0),  
            "configVersion" : 2  
        }  
    ],  
    "ok" : 1  
}

如果连接的机器是另外一个机器,也就说不是mongodb复制集中的机器,需要添加host(此处需要说明的是php,如果是和mongodb分开的那么需要在php机器的hosts中添加hosts)

vim  /etc/hosts

192.168.220.105 mongo0.example.com
192.168.220.106 mongo1.example.com

 

在shell 下面链接:(test是数据库的名字,rs0是复制集的名字)

mongo --host rs0/mongo0.example.com:27017,mongo1.example.com:27017 test

在php中连接:

'dsn' => 'mongodb://192.168.220.105:27017/erp,192.168.220.106:27017/erp?replicaSet=rs0&readPreference=primaryPreferred',

备份:

mongodump  -h 192.168.220.60:27500 -d erp -o /terry/erp

恢复:

mongorestore  -h 192.168.220.105:27017 -d erp  /terry/erp

如果在配置复制集过程中出现了问题,无法进行,一般是想重新配置,但有一种比较好的办法,就是删除掉dbPath,在配置文件中dbPath的配置如下:

dbPath: /var/lib/mongo
rm -rf /var/lib/mongo/*

 

其他:

1. 删除mongodb的库,重新启动

mv /var/lib/mongo /var/lib/mongo1  
mkdir /var/lib/mongo  
chown mongod:mongod /var/lib/mongo

2.删除复制集节点:

rs.remove("mongo0.example.com:27017")

3.在副本集的副节点读数据:

db.setSlaveOk()

4.主从切换

进入主mongo  执行:

rs.stepDown(15);

log如下:

rs0:PRIMARY> rs.stepDown(15);
2016-10-08T10:37:25.511+0800 E QUERY    [thread1] 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:135:1
DB.prototype.adminCommand@src/mongo/shell/db.js:153:16
rs.stepDown@src/mongo/shell/utils.js:1181:12
@(shell):1:1

2016-10-08T10:37:25.513+0800 I NETWORK  [thread1] trying reconnect to 127.0.0.1:27017 (127.0.0.1) failed
2016-10-08T10:37:25.525+0800 I NETWORK  [thread1] reconnect 127.0.0.1:27017 (127.0.0.1) ok
rs0:SECONDARY> 
rs0:SECONDARY> 
rs0:SECONDARY> 
rs0:SECONDARY> 
rs0:SECONDARY> 

 

 

参考:

https://gist.github.com/leommoore/309de7c0042ed697ee84

https://docs.mongodb.com/manual/tutorial/install-mongodb-on-red-hat/

https://docs.mongodb.com/manual/tutorial/deploy-replica-set/

https://docs.mongodb.com/manual/reference/configuration-options/