因为之前 MongoDB 云数据库 购买是深圳地区单节点版，续费略有些贵，一年续费1020元，目前主机是在香港，单节点MongoDB，香港区域的阿里云没得买，还有一个 Serverless 版 MongoDB，价格便宜一些，一年要三四百元，摸索了几天，发现太坑了，连接方式不一样，导入数据失败。
原来的数据库版本是 4.0，Serverless 版 MongoDB 的版本是4.2，将数据从4.0导出到4.2中，死活不行，数据导入一部分后提示
createIndex error。将数据导入到本地 4.0，升级 MongoDB 到 4.2 后导出，再导入到 Serverless 版 MongoDB，仍然是数据导入一部分后提示
createIndex error在网上搜索也找不到相关内容 😓
想起 MongoDB 官方有个可以免费使用的 atlas，很早以前就注册了，一直没有怎么使用，试着将数据导入，顺畅一气呵成。从4.0导出，直接导入到了4.4.4版本，没有提示任何错误。看起来数据也很正常
因为 MongoDB atlas 创建时选择的是 Azure Hong Kong，从阿里云香港到 MongoDB atlas 到 ping 值在 3 毫秒左右，够啦，够啦。不过 MongoDB atlas 免费版没有数据备份，以后就要手动备份了。
数据备份导出
mongodump --uri="mongodb://username:password@dds-wz9c05****************.mongodb.rds.aliyuncs.com:3717/dbname"
替换上面的
username、password、dbname以及 URL 地址
执行完成后，将在当前目录自动生成一个 dump 文件夹，里面即为备份文件
导出记录
coder@761a694cd888:~/project/server/db$ mongodump --uri="mongodb://funsapp:*****@dds-wz9c05****************.mongodb.rds.aliyuncs.com:3717/funsapp"
2021-03-27T02:28:08.272+0000 writing funsapp.sessions to dump/funsapp/sessions.bson
2021-03-27T02:28:08.341+0000 writing funsapp.stats to dump/funsapp/stats.bson
2021-03-27T02:28:08.348+0000 writing funsapp.posts to dump/funsapp/posts.bson
2021-03-27T02:28:08.355+0000 writing funsapp.signs to dump/funsapp/signs.bson
2021-03-27T02:28:08.397+0000 done dumping funsapp.signs (4888 documents)
2021-03-27T02:28:08.398+0000 writing funsapp.users to dump/funsapp/users.bson
2021-03-27T02:28:08.409+0000 done dumping funsapp.posts (299 documents)
2021-03-27T02:28:08.423+0000 done dumping funsapp.users (62 documents)
2021-03-27T02:28:08.423+0000 writing funsapp.apps to dump/funsapp/apps.bson
2021-03-27T02:28:08.431+0000 writing funsapp.links to dump/funsapp/links.bson
2021-03-27T02:28:08.432+0000 done dumping funsapp.stats (3338 documents)
2021-03-27T02:28:08.447+0000 writing funsapp.myapps to dump/funsapp/myapps.bson
2021-03-27T02:28:08.455+0000 done dumping funsapp.apps (51 documents)
2021-03-27T02:28:08.456+0000 done dumping funsapp.links (37 documents)
2021-03-27T02:28:08.456+0000 writing funsapp.comments to dump/funsapp/comments.bson
2021-03-27T02:28:08.457+0000 writing funsapp.promotions to dump/funsapp/promotions.bson
2021-03-27T02:28:08.469+0000 done dumping funsapp.myapps (28 documents)
2021-03-27T02:28:08.470+0000 writing funsapp.urls to dump/funsapp/urls.bson
2021-03-27T02:28:08.473+0000 done dumping funsapp.comments (24 documents)
2021-03-27T02:28:08.479+0000 writing funsapp.pages to dump/funsapp/pages.bson
2021-03-27T02:28:08.481+0000 done dumping funsapp.promotions (9 documents)
2021-03-27T02:28:08.482+0000 writing funsapp.tasks to dump/funsapp/tasks.bson
2021-03-27T02:28:08.493+0000 done dumping funsapp.urls (8 documents)
2021-03-27T02:28:08.497+0000 done dumping funsapp.tasks (3 documents)
2021-03-27T02:28:08.518+0000 done dumping funsapp.pages (8 documents)
2021-03-27T02:28:08.552+0000 done dumping funsapp.sessions (32454 documents)
数据导入
mongorestore --uri mongodb+srv://username:password@cluster0.p****.mongodb.net/dbname
mongorestore --uri mongodb+srv://username:password@clust***.p4***.mongodb.net/dbname --db dbname ./dump/dbname
替换上面的
username、password、dbname以及 URL 地址--db 指定导入的数据库名，后面接导入数据源。可省略，默认导入当前目录下的
./dump/中数据
导入记录
coder@761a694cd888:~/project/server/db27$ mongorestore --uri mongodb+srv://funsapp:*****@cluster0.p****.mongodb.net/funsapp --db funsapp ./dump/funsapp
2021-03-27T02:29:14.365+0000 the --db and --collection args should only be used when restoring from a BSON file. Other uses are deprecated and will not exist in the future; use --nsInclude instead
2021-03-27T02:29:14.369+0000 building a list of collections to restore from dump/funsapp dir
2021-03-27T02:29:14.462+0000 reading metadata for funsapp.sessions from dump/funsapp/sessions.metadata.json
2021-03-27T02:29:15.166+0000 reading metadata for funsapp.stats from dump/funsapp/stats.metadata.json
2021-03-27T02:29:15.169+0000 reading metadata for funsapp.posts from dump/funsapp/posts.metadata.json
2021-03-27T02:29:15.173+0000 reading metadata for funsapp.signs from dump/funsapp/signs.metadata.json
2021-03-27T02:29:15.177+0000 restoring funsapp.sessions from dump/funsapp/sessions.bson
2021-03-27T02:29:15.290+0000 restoring funsapp.stats from dump/funsapp/stats.bson
2021-03-27T02:29:15.326+0000 restoring funsapp.posts from dump/funsapp/posts.bson
2021-03-27T02:29:15.947+0000 restoring funsapp.signs from dump/funsapp/signs.bson
2021-03-27T02:29:17.199+0000 [#.......................] funsapp.sessions 395KB/6.22MB (6.2%)
2021-03-27T02:29:17.199+0000 [#############...........] funsapp.stats 846KB/1.44MB (57.5%)
2021-03-27T02:29:17.199+0000 [########################] funsapp.posts 1.09MB/1.09MB (100.0%)
2021-03-27T02:29:17.199+0000 [##############..........] funsapp.signs 234KB/381KB (61.5%)
2021-03-27T02:29:17.199+0000
2021-03-27T02:29:18.029+0000 [########################] funsapp.signs 381KB/381KB (100.0%)
2021-03-27T02:29:18.030+0000 no indexes to restore
2021-03-27T02:29:18.034+0000 finished restoring funsapp.signs (4888 documents, 0 failures)
2021-03-27T02:29:18.037+0000 reading metadata for funsapp.apps from dump/funsapp/apps.metadata.json
2021-03-27T02:29:18.148+0000 restoring funsapp.apps from dump/funsapp/apps.bson
2021-03-27T02:29:18.342+0000 no indexes to restore
2021-03-27T02:29:18.345+0000 finished restoring funsapp.apps (51 documents, 0 failures)
2021-03-27T02:29:18.348+0000 reading metadata for funsapp.users from dump/funsapp/users.metadata.json
2021-03-27T02:29:18.470+0000 restoring funsapp.users from dump/funsapp/users.bson
2021-03-27T02:29:18.579+0000 restoring indexes for collection funsapp.users from metadata
2021-03-27T02:29:19.031+0000 finished restoring funsapp.users (62 documents, 0 failures)
2021-03-27T02:29:19.035+0000 reading metadata for funsapp.pages from dump/funsapp/pages.metadata.json
2021-03-27T02:29:19.151+0000 restoring funsapp.pages from dump/funsapp/pages.bson
2021-03-27T02:29:19.245+0000 restoring indexes for collection funsapp.pages from metadata
2021-03-27T02:29:19.482+0000 finished restoring funsapp.pages (8 documents, 0 failures)
2021-03-27T02:29:19.485+0000 reading metadata for funsapp.myapps from dump/funsapp/myapps.metadata.json
2021-03-27T02:29:19.600+0000 restoring funsapp.myapps from dump/funsapp/myapps.bson
2021-03-27T02:29:19.661+0000 [########################] funsapp.posts 1.09MB/1.09MB (100.0%)
2021-03-27T02:29:19.661+0000 restoring indexes for collection funsapp.posts from metadata
2021-03-27T02:29:19.706+0000 no indexes to restore
2021-03-27T02:29:19.709+0000 finished restoring funsapp.myapps (28 documents, 0 failures)
2021-03-27T02:29:19.712+0000 reading metadata for funsapp.links from dump/funsapp/links.metadata.json
2021-03-27T02:29:19.824+0000 restoring funsapp.links from dump/funsapp/links.bson
2021-03-27T02:29:19.860+0000 finished restoring funsapp.posts (299 documents, 0 failures)
2021-03-27T02:29:19.863+0000 reading metadata for funsapp.comments from dump/funsapp/comments.metadata.json
2021-03-27T02:29:19.926+0000 restoring indexes for collection funsapp.links from metadata
2021-03-27T02:29:19.977+0000 restoring funsapp.comments from dump/funsapp/comments.bson
2021-03-27T02:29:20.104+0000 no indexes to restore
2021-03-27T02:29:20.108+0000 finished restoring funsapp.comments (24 documents, 0 failures)
2021-03-27T02:29:20.111+0000 reading metadata for funsapp.urls from dump/funsapp/urls.metadata.json
2021-03-27T02:29:20.125+0000 finished restoring funsapp.links (37 documents, 0 failures)
2021-03-27T02:29:20.127+0000 reading metadata for funsapp.promotions from dump/funsapp/promotions.metadata.json
2021-03-27T02:29:20.199+0000 [##......................] funsapp.sessions 787KB/6.22MB (12.4%)
2021-03-27T02:29:20.199+0000 [########################] funsapp.stats 1.44MB/1.44MB (100.0%)
2021-03-27T02:29:20.199+0000
2021-03-27T02:29:20.236+0000 restoring funsapp.urls from dump/funsapp/urls.bson
2021-03-27T02:29:20.270+0000 restoring funsapp.promotions from dump/funsapp/promotions.bson
2021-03-27T02:29:20.326+0000 no indexes to restore
2021-03-27T02:29:20.330+0000 finished restoring funsapp.urls (8 documents, 0 failures)
2021-03-27T02:29:20.334+0000 reading metadata for funsapp.tasks from dump/funsapp/tasks.metadata.json
2021-03-27T02:29:20.360+0000 [########################] funsapp.stats 1.44MB/1.44MB (100.0%)
2021-03-27T02:29:20.360+0000 no indexes to restore
2021-03-27T02:29:20.364+0000 finished restoring funsapp.stats (3338 documents, 0 failures)
2021-03-27T02:29:20.369+0000 no indexes to restore
2021-03-27T02:29:20.373+0000 finished restoring funsapp.promotions (9 documents, 0 failures)
2021-03-27T02:29:20.443+0000 restoring funsapp.tasks from dump/funsapp/tasks.bson
2021-03-27T02:29:20.555+0000 no indexes to restore
2021-03-27T02:29:20.559+0000 finished restoring funsapp.tasks (3 documents, 0 failures)
2021-03-27T02:29:23.199+0000 [#######.................] funsapp.sessions 1.92MB/6.22MB (30.9%)
2021-03-27T02:29:26.199+0000 [#############...........] funsapp.sessions 3.45MB/6.22MB (55.5%)
2021-03-27T02:29:29.199+0000 [###################.....] funsapp.sessions 5.18MB/6.22MB (83.2%)
2021-03-27T02:29:30.964+0000 [########################] funsapp.sessions 6.22MB/6.22MB (100.0%)
2021-03-27T02:29:30.965+0000 restoring indexes for collection funsapp.sessions from metadata
2021-03-27T02:29:31.244+0000 finished restoring funsapp.sessions (32454 documents, 0 failures)
2021-03-27T02:29:31.245+0000 41209 document(s) restored successfully. 0 document(s) failed to restore.
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