不能恢復其使用mongorestore

Question

刪除的表我做這個測試mongorestore實用

下面是我的測試程序：

mongo 127.0.0.1/mytest -u alex -p alex 
> db.createCollection("test1") 
{ "ok" : 1 } 
> db.test1.insert({id:1,name:"alex"}) 
> db.test1.find() 
{ "_id" : ObjectId("519b3d7808b450e533c8ea5e"), "id" : 1, "name" : "alex" } 
> show collections; 
system.indexes 
system.users 
test1 
testtable 
> exit 

ps -ef|grep mongod 
root  3201 3180 0 16:46 pts/1 00:00:00 vi /etc/mongod.conf 
root  3583  1 0 17:27 ?  00:00:00 /opt/mongodb/bin/mongod -f /etc/mongod.conf 
root  3600 3267 0 17:28 pts/3 00:00:00 grep mongod 

kill -9 3583 

使用mongodump

/opt/mongodb/bin/mongodump --dbpath /data/db/ --journal --out /data/dump 
Tue May 21 17:26:38.107 [tools] journal dir=/data/db/journal 
Tue May 21 17:26:38.107 [tools] recover begin 
Tue May 21 17:26:38.107 [tools] recover lsn: 33813 
Tue May 21 17:26:38.107 [tools] recover /data/db/journal/j._0 
Tue May 21 17:26:38.126 [tools] recover skipping application of section seq:0 < lsn:33813 
Tue May 21 17:26:38.129 [tools] recover cleaning up 
Tue May 21 17:26:38.129 [tools] removeJournalFiles 
Tue May 21 17:26:38.130 [tools] recover done 
Tue May 21 17:26:38.204 [tools] all dbs 
Tue May 21 17:26:38.205 [tools] DATABASE: mytest   to  /data/dump/mytest 
Tue May 21 17:26:38.206 [tools]   mytest.system.indexes to /data/dump/mytest/system.indexes.bson 
Tue May 21 17:26:38.207 [tools]     4 objects 
Tue May 21 17:26:38.207 [tools]   mytest.system.users to /data/dump/mytest/system.users.bson 
Tue May 21 17:26:38.207 [tools]     1 objects 
Tue May 21 17:26:38.207 [tools]   Metadata for mytest.system.users to /data/dump/mytest/system.users.metadata.json 
Tue May 21 17:26:38.207 [tools]   mytest.testtable to /data/dump/mytest/testtable.bson 
Tue May 21 17:26:38.208 [tools]     3 objects 
Tue May 21 17:26:38.208 [tools]   Metadata for mytest.testtable to /data/dump/mytest/testtable.metadata.json 
Tue May 21 17:26:38.208 [tools]   mytest.test1 to /data/dump/mytest/test1.bson 
Tue May 21 17:26:38.208 [tools]     1 objects 
Tue May 21 17:26:38.208 [tools]   Metadata for mytest.test1 to /data/dump/mytest/test1.metadata.json 
Tue May 21 17:26:38.208 dbexit: 
Tue May 21 17:26:38.209 [tools] shutdown: going to close listening sockets... 
Tue May 21 17:26:38.209 [tools] shutdown: going to flush diaglog... 
Tue May 21 17:26:38.209 [tools] shutdown: going to close sockets... 
Tue May 21 17:26:38.209 [tools] shutdown: waiting for fs preallocator... 
Tue May 21 17:26:38.209 [tools] shutdown: lock for final commit... 
Tue May 21 17:26:38.209 [tools] shutdown: final commit... 
Tue May 21 17:26:38.209 [tools] shutdown: closing all files... 
Tue May 21 17:26:38.210 [tools] closeAllFiles() finished 
Tue May 21 17:26:38.210 [tools] journalCleanup... 
Tue May 21 17:26:38.210 [tools] removeJournalFiles 
Tue May 21 17:26:38.211 [tools] shutdown: removing fs lock... 
Tue May 21 17:26:38.211 dbexit: really exiting now 

開始做文件備份mongod

# /opt/mongodb/bin/mongod -f /etc/mongod.conf 

DROP TABLE test1的

# mongo 127.0.0.1/mytest -u alex -p alex 
> show collections; 
system.indexes 
system.users 
test1 
testtable 
> db.test1.drop() 
true 
> show collections; 
system.indexes 
system.users 
testtable 
> exit 
bye 

關機的mongod

# ps -ef|grep mongod 
root  3201 3180 0 16:46 pts/1 00:00:00 vi /etc/mongod.conf 
root  3544  1 0 17:24 ?  00:00:00 /opt/mongodb/bin/mongod -f /etc/mongod.conf 
root  3556 3267 0 17:24 pts/3 00:00:00 grep mongod 
# kill -9 3544 

嘗試從備份

# mongorestore --dbpath /data/db --directoryperdb --journal /data/dump/ 
Tue May 21 17:29:57.518 [tools] journal dir=/data/db/journal 
Tue May 21 17:29:57.518 [tools] recover begin 
Tue May 21 17:29:57.519 [tools] info no lsn file in journal/ directory 
Tue May 21 17:29:57.519 [tools] recover lsn: 0 
Tue May 21 17:29:57.519 [tools] recover /data/db/journal/j._0 
Tue May 21 17:29:57.554 [tools] recover cleaning up 
Tue May 21 17:29:57.554 [tools] removeJournalFiles 
Tue May 21 17:29:57.555 [tools] recover done 
Tue May 21 17:29:57.629 [tools] /data/dump/mytest/test1.bson 
Tue May 21 17:29:57.630 [tools]   going into namespace [mytest.test1] 
Tue May 21 17:29:57.631 [tools] warning: Restoring to mytest.test1 without dropping. Restored data will be inserted without raising errors; check your server log 
1 objects found 
Tue May 21 17:29:57.632 [tools]   Creating index: { key: { _id: 1 }, ns: "mytest.test1", name: "_id_" } 
Tue May 21 17:29:57.633 [tools] /data/dump/mytest/system.users.bson 
Tue May 21 17:29:57.633 [tools]   going into namespace [mytest.system.users] 
Tue May 21 17:29:57.633 [tools] warning: Restoring to mytest.system.users without dropping. Restored data will be inserted without raising errors; check your server log 
1 objects found 
Tue May 21 17:29:57.634 [tools]   Creating index: { key: { _id: 1 }, ns: "mytest.system.users", name: "_id_" } 
Tue May 21 17:29:57.634 [tools]   Creating index: { key: { user: 1, userSource: 1 }, unique: true, ns: "mytest.system.users", name: "user_1_userSource_1" } 
Tue May 21 17:29:57.634 [tools] /data/dump/mytest/testtable.bson 
Tue May 21 17:29:57.634 [tools]   going into namespace [mytest.testtable] 
Tue May 21 17:29:57.634 [tools] warning: Restoring to mytest.testtable without dropping. Restored data will be inserted without raising errors; check your server log 
3 objects found 
Tue May 21 17:29:57.635 [tools]   Creating index: { key: { _id: 1 }, ns: "mytest.testtable", name: "_id_" } 
Tue May 21 17:29:57.635 dbexit: 
Tue May 21 17:29:57.636 [tools] shutdown: going to close listening sockets... 
Tue May 21 17:29:57.636 [tools] shutdown: going to flush diaglog... 
Tue May 21 17:29:57.636 [tools] shutdown: going to close sockets... 
Tue May 21 17:29:57.636 [tools] shutdown: waiting for fs preallocator... 
Tue May 21 17:29:57.636 [tools] shutdown: lock for final commit... 
Tue May 21 17:29:57.636 [tools] shutdown: final commit... 
Tue May 21 17:29:57.649 [tools] shutdown: closing all files... 
Tue May 21 17:29:57.649 [tools] closeAllFiles() finished 
Tue May 21 17:29:57.649 [tools] journalCleanup... 
Tue May 21 17:29:57.649 [tools] removeJournalFiles 
Tue May 21 17:29:57.650 [tools] shutdown: removing fs lock... 
Tue May 21 17:29:57.650 dbexit: really exiting now 

恢復TEST1並找到mytest的數據庫中沒有test1的

# mongo 127.0.0.1/mytest -u alex -p alex\ 
> show collections; 
system.indexes 
system.users 
testtable 

Answer 1

當您使用帶有--directoryperdb選項的mongorestore時，每個數據庫的文件都將保存在磁盤上的離散目錄中。

對於您的情況，集合test1的名稱空間爲mytest.test1。當使用--directoryperdb選項還原轉儲時，集合test1已恢復到目錄/data/db/mytest，而不是/data/db。

如果您從--dbpath /data/db啓動mongod，則無法找到test1集合，因爲集合已從此dbpath中刪除。要找到您恢復的test1集合，您應該使用--dbpath /data/db/mytest啓動mongod。