mongoDB配置主从同步

官方网站：
http://www.mongodb.org/

MongoDB 安裝,主从配置

一 MongoDB 安装

1. [[email protected]_server src]# wget http://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.0.0.tgz
2. [[email protected]_server src]# tar xzvf mongodb-linux-x86_64-2.0.0.tgz
3. [[email protected]_server src]# mv mongodb-linux-x86_64-2.0.0 /usr/local/mongodb
4. [[email protected]_server src]# mkdir /usr/local/mongodb/data
5. [[email protected]_server src]# touch /usr/local/mongodb/logs
6. [[email protected]_server bin]# /usr/local/mongodb/bin/mongod --dbpath=/usr/local/mongodb/data --logpath=/usr/local/mongodb/logs --logappend --port=27017 --fork
7. [[email protected]_server bin]#./mongo
8. MongoDB shell version: 2.0.0
9. connecting to:test
10. > use test;
11. switched to db test
12. > exit
13. bye
14. [[email protected]_server bin]# netstat -anlpt | grep mongo
15. tcp 0 0 0.0.0.0:27017 0.0.0.0:* LISTEN 11504/mongod
16. tcp 0 0 0.0.0.0:28017 0.0.0.0:* LISTEN 11504/mongod

注意：
如果报错
-bash: /usr/local/mongodb/bin/mongod: cannot execute binary file
说明你的服务器和mongodb 的版本不对应, 如果服务器是64位,下载x86_64的mongodb ,如果服务器是32位的, 下载i686的mongodb/

二 MongoDB 主从配置

1)实验环境
主:192.168.0.14
从:192.168.0.64

2)时间同步
两台机器做时间同步
[[email protected]_server src]# ntpdate time.windows.com

3)启动服务
master:192.168.0.14
启动命令
/usr/local/mongodb/bin/mongod --master --dbpath=/usr/local/mongodb/data --logpath=/usr/local/mongodb/logs --logappend --port=27017 --fork

slave:192.168.0.64
启动命令
/usr/local/mongodb/bin/mongod --slave --source 192.168.0.14:27017 --dbpath=/usr/local/mongodb/data --logpath=/usr/local/mongodb/logs --logappend --port=27017 --fork

4)测试主从
在主上插入数据
测试1：

1. 测试1：
2. 1 在主库上插入数据
3. [[email protected] bin]#./mongo
4. MongoDB shell version: 2.0.0
5. connecting to:test
6. > db.foo.save({"id":123456,"name":‘lizonggang‘})
7. > db.foo.find({"id":123456})
8. { "_id": ObjectId("51c3f4b21399022afd992f39"),"id": 123456,"name":"lizonggang" }
9. >
10. 2 在从上查看数据(已有在主上插入的数据,说明主从成功)
11. [[email protected]_server bin]#./mongo
12. MongoDB shell version: 2.0.0
13. connecting to:test
14. > db.foo.find({"id":123456})
15. { "_id": ObjectId("51c3f4b21399022afd992f39"),"id": 123456,"name":"lizonggang" }
16. >

测试2：

1. 1 在主库上插入数据
2. > use elaindb
3. switched to db elaindb
4. > db.test.save({title:"This is a test!"})
5. > db.test.find();
6. { "_id": ObjectId("51c3f8f11a90c8da157c7f64"),"title":"This is a test!" }
7. >
8. 2 在从库上验证数据
9. [[email protected]_server bin]#./mongo
10. MongoDB shell version: 2.0.0
11. connecting to:test
12. > use elaindb
13. switched to db elaindb
14. > db.test.find();
15. { "_id": ObjectId("51c3f8f11a90c8da157c7f64"),"title":"This is a test!" }
16. > db.printReplicationInfo();
17. this is a slave, printing slave replication info.
18. source: 192.168.0.14:27017
19. syncedTo: Fri Jun 21 2013 14:59:10 GMT+0800 (CST)
20. = 9 secs ago (0hrs)
21. >
22. > db.printSlaveReplicationInfo();
23. source: 192.168.0.14:27017
24. syncedTo: Fri Jun 21 2013 14:59:30 GMT+0800 (CST)
25. = 16 secs ago (0hrs)
26. >

测试3：

1. 在这个状态下,slave 下是不可以插入数据的
2. > db.test.save({title:"This is slave test!"})
3. not master

5) 一些查询状态的语句

1)查询库

1. > show dbs;
2. elaindb 0.0625GB
3. local 0.125GB
4. test 0.0625GB

2)在从库上查询主库的地址

1. > use local;
2. switched to db local
3. > db.sources.find()
4. { "_id": ObjectId("51c3f5dd568d10529950b10d"),"host":"192.168.0.14:27017","source":"main","syncedTo": { "t": 1371797300000,"i": 1 } }
5. >

3)查看主从复制状态

1. > db.printReplicationInfo();
2. configured oplog size: 47.6837158203125MB
3. log length start to end: 1375secs (0.38hrs)
4. oplog first event time: Fri Jun 21 2013 14:30:35 GMT+0800 (CST)
5. oplog last event time: Fri Jun 21 2013 14:53:30 GMT+0800 (CST)
6. now: Fri Jun 21 2013 14:53:32 GMT+0800 (CST)
7. >

4)查看Collection状态

1. > db.printCollectionStats();
2. foo
3. {
4. "ns":"test.foo",
5. "count": 1,
6. "size": 56,
7. "avgObjSize": 56,
8. "storageSize": 4096,
9. "numExtents": 1,
10. "nindexes": 1,
11. "lastExtentSize": 4096,
12. "paddingFactor": 1,
13. "flags": 1,
14. "totalIndexSize": 8176,
15. "indexSizes": {
16. "_id_": 8176
17. },
18. "ok": 1
19. }
20. ---
21. system.indexes
22. {
23. "ns":"test.system.indexes",
24. "count": 1,
25. "size": 64,
26. "avgObjSize": 64,
27. "storageSize": 4096,
28. "numExtents": 1,
29. "nindexes": 0,
30. "lastExtentSize": 4096,
31. "paddingFactor": 1,
32. "flags": 0,
33. "totalIndexSize": 0,
34. "indexSizes": {
35. },
36. "ok": 1
37. }
38. ---
39. >

6)应急
如果在应用中主挂掉了怎么办？
这个情况就需要,停止从库, 把从库以主库的启动命令起来就可以了。

1)停掉从库

kill -9 进程号

2)删除locat下文件

1. rm mongodb/db/locat.*-rf

3)启动从库

1. /usr/local/mongodb/bin/mongod --master --dbpath=/usr/local/mongodb/data --logpath=/usr/local/mongodb/logs --logappend --port=27017 --fork

7) MongoDB 增，删，改，查

1. [[email protected] bin]#./mongo

2. MongoDB shell version: 2.0.0
3. connecting to:test
4. > db.test.insert({"Name":"ymind","age": 8 }); #在test数据库里插入数据
5. >
6. > db.test.find({"Name":"ymind" } ); #查询数据
7. { "_id": ObjectId("51c4187090db4e4751a3cd05"),"Name":"ymind","age": 8 }
8. > db.test.find({"age": 8} ); #查询数据
9. { "_id": ObjectId("51c4187090db4e4751a3cd05"),"Name":"ymind","age": 8 }
10. >
11. >
12. > db.test.update({"Name":"ymind"}, { "$set": { "age":"5" } } ); #修改数据
13. > db.test.find({"Name":"ymind" } );
14. { "Name":"ymind","_id": ObjectId("51c4187090db4e4751a3cd05"),"age":"5" }
15. >
16. > db.test.remove({"Name":"ymind" } ); #删除数据
17. > db.test.find({"Name":"ymind" } );
18. >
19. >