环境

• Linux Mint 17.1
• 本地主机
• 默认 MongoDB 端口 27017
• 从脚本连接不需要用户名或密码。

背景

我安装了 MongoDB:

apt-get install mongodb-10gen=2.4.9

然后我“固定”了包，这样就不会对其应用任何更新:

echo "mongodb-10gen hold" | sudo dpkg --set-selections

期望的行为r

我想升级到最新版本的 MongoDB，正在查看有关此过程的官方指南:

http://docs.mongodb.org/manual/release-notes/2.6-upgrade

早期声明:

To begin the upgrade procedure, connect a 2.6 mongo shell to your MongoDB 2.4 mongos or mongod and run the db.upgradeCheckAllDBs() to check your data set for compatibility.

问题

如何将 2.6 mongo shell 连接到 2.4.9 mongod？

我猜想我需要安装 2.6 mongo shell 并运行它，但是:

• 我不知道该怎么做
• 我不想破坏任何东西。

我已经完成了所有数据库的mongodump，所以有一个备份。

最佳答案

我尝试单独安装 mongo 2.6，但这导致其他包被标记为删除。我最终只是卸载旧包并重新安装新包，并将过程包含在此处以供引用。

下面的一些步骤没有用，但我已经将它们和它们的结果作为尝试的文档包括在内。我之前对所有数据库进行了 mongodump，因此有一个备份。

最终结果是，除了 admin 数据库恢复之外，目前一切似乎都在“工作”。

01. 关闭 mongod

mongo
use admin
db.shutdownServer()

来自:http://docs.mongodb.org/manual/tutorial/manage-mongodb-processes/

02. 删除了 mongodb-10gen 的“固定包”状态:

echo "mongodb-10gen install" | sudo dpkg --set-selections

来自:https://help.ubuntu.com/community/PinningHowto

03. 然后我尝试安装最新的 mongo:

sudo apt-get install -y mongodb-org-shell

来自:http://docs.mongodb.org/manual/tutorial/install-mongodb-on-ubuntu/

04. shell版本好像更新了:

mongo --version
MongoDB shell version: 2.6.6

05. 但是后来我无法连接 mongo:

mongo
connecting to: test
2015-01-04T00:08:50.482+1000 warning: Failed to connect to 127.0.0.1:27017, reason: errno:111 Connection refused
2015-01-04T00:08:50.483+1000 Error: couldn't connect to server 127.0.0.1:27017 (127.0.0.1), connection attempt failed at src/mongo/shell/mongo.js:146
exception: connect failed

或mongod:

mongod
The program 'mongod' is currently not installed. You can install it by typing:
sudo apt-get install mongodb-server

06. 我运行了以下命令以查看 apt-get 安装/删除的历史记录:

less /var/log/apt/history.log

得到:

Start-Date: 2015-01-04  00:02:08
Commandline: apt-get install -y mongodb-org-shell
Install: mongodb-org-shell:amd64 (2.6.6)
Remove: mongodb-10gen:amd64 (2.4.9)
End-Date: 2015-01-04  00:02:21

07. 我跑了:

dpkg --get-selections

看到了:

mongodb-10gen deinstall

我认为“卸载”意味着它被标记为删除。

08. 我决定删除所有 mongodb-10gen 包:

sudo apt-get purge mongodb-10gen

Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  gir1.2-clutter-gst-2.0 gir1.2-ges-1.0 gstreamer1.0-gnonlin libav-tools
  libavdevice53 libavfilter3 libavresample1 libges-1.0-0 libgoocanvas-common
  libgoocanvas3 libmlt++3 libmlt-data libmlt6 libqjson0 libquicktime2
  libsoprano4 melt python-dateutil python-gst-1.0 python-matplotlib
  python-matplotlib-data python-mlt python-pygoocanvas python-pyparsing
  python-tz python3-bs4 python3-markdown shared-desktop-ontologies
  soprano-daemon wkhtmltopdf
Use 'apt-get autoremove' to remove them.
The following packages will be REMOVED:
  mongodb-10gen*
0 to upgrade, 0 to newly install, 1 to remove and 3 not to upgrade.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] 

Y

(Reading database ... 246460 files and directories currently installed.)
Removing mongodb-10gen (2.4.9) ...
Purging configuration files for mongodb-10gen (2.4.9) ...
dpkg: warning: while removing mongodb-10gen, directory '/var/lib/mongodb' not empty so not removed

来自:https://askubuntu.com/a/147177

09. 我备份了无法删除的目录，即/var/lib/mongodb:

sudo cp -avr /var/lib/mongodb/ /home/

10. 然后删除它。

cd /var/lib/
sudo rm -rf mongodb/

11. 我搜索了一下是否还有 mongodb-10gen 包:

dpkg --get-selections | grep "mongodb-10gen"

什么也没返回。

12. 我通过 Synaptic Package Manager 安装了版本为 2.6.6 的 mongodb-org。

13. 我检查了所有 mongodb 包的版本是否相同:

mongodump --version
mongorestore --version
mongo --version
mongod --version
mongos --version
# all returned 2.6.6

14. 然后我对每个数据库转储执行了一个 mongorestore，例如:

mongorestore --db dname_01 /path/to/dump/dbname_01/
mongorestore --db dname_02 /path/to/dump/dbname_02/

它似乎适用于所有数据库，但在 admin 数据库上失败:

assertion: 17415 Cannot restore users with schema version 1 to a system with server version 2.5.4 or greater

users 数据库抛出了一些异常，例如:

Restoring to users.pending_registrations without dropping. Restored data will be inserted without raising errors; check your server log
Restoring to users.roles without dropping. Restored data will be inserted without raising errors; check your server log
Restoring to users.users without dropping. Restored data will be inserted without raising errors; check your server log

15. 我运行了 db.upgradeCheckAllDBs():

mongo
use admin

db.upgradeCheckAllDBs()

Checking database local
Checking collection local.startup_log
Checking collection local.system.indexes
Checking database dname_01
...
Checking database admin
Everything is ready for the upgrade!
true

来自:http://docs.mongodb.org/manual/release-notes/2.6-upgrade/#preparedness

关于mongodb - 如何将 2.6 mongo shell 连接到 2.4.9 mongod？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27755054/