将旧版本的mongo的数据库转储还原到新版本的mongo [英] Restoring the database dump of an older version of mongo to a new version of mongo

问题描述

当前，我有一个较旧的mongo版本，即系统上运行的2.6.我已经在生产站点，并且有很多客户数据.我正计划升级到mongo 3.2.

Currently, I have an older version of mongo, i.e 2.6 running on my system. I already have my site in production and have a lot of client data. I am planning an upgrade to mongo 3.2.

所以，我的问题是mongo v3.2 的mongorestore是否可以与 v2.6 的数据转储一起使用?还是已知会造成问题?

So, my question is whether mongorestore of mongo v3.2 work with data dump of v2.6? Or, is it known to create problems?

任何答案都是无价之宝！谢谢

Any answers will be invaluable! Thanks

推荐答案

我问了这个

I asked this same question on the official MongoDB mailing list. They said not to upgrade more than 1 major version at a time. (Major versions being: 2.2, 2.4, 2.6, 3.0, 3.2, 3.4)

我不想遵循安装每个版本的正常升级过程，只是启动mongod然后将其关闭.在我看来，这会遗留下来的麻烦，而且我希望对基础架构进行脚本编写和版本控制.因此，我决定使用最新的Ubuntu(因为我的Mongo v2.4服务器也落后2个LTS版本)和最新的MongoDB启动新的EC2实例.我使用了MongoDB中间版本的docker映像进行数据升级.

I didn't want to follow the normal upgrade process of installing every version Just to launch mongod and then shut it down. That feels to me like it would leave cruft behind and I like to have my infrastructure building scripted and version controlled. So, I decided to launch new EC2 instances with the latest Ubuntu (since my Mongo v2.4 servers were also 2 LTS versions behind) and the latest MongoDB. I used docker images of intermediate versions of MongoDB to do the data upgrades.

https://gist.github.com/RichardBronosky/2d60c797a uat_mongodb_upgrade_from_prod-sh

解决方案的主要内容是:

The bulk of the solution is this:

# mongo.conf is using the default dbPath: /var/lib/mongodb
# this path is for temporary use by the mongo docker container
mkdir -p /data/db/dump
# see: https://hub.docker.com/_/mongo/ (search for /data/db)
# see: https://github.com/docker-library/mongo/blob/30d09dbd6343d3cbd1bbea2d6afde49f5d9a9295/3.4/Dockerfile#L59
cd /data/db
mongodump -h prodmongo.int

# Get major versions from https://hub.docker.com/r/library/mongo/tags/
step=0
for major_version in 2.6.12 3.0.14 3.2.11 3.4.1; do
    sudo docker stop some-mongo || true
    sudo docker rm   some-mongo || true
    sudo docker run --name some-mongo -v /data/db:/data/db -d mongo:$major_version
    false; while [[ $? > 0 ]]; do
        sleep 0.5
        sudo docker exec -it some-mongo mongo --eval 'printjson((new Mongo()).getDBNames())'
    done
    if (( $step == 0 )); then
        sudo docker exec -it some-mongo mongorestore /data/db/dump
    fi
    ((step += 1))
done

# Finish up with docker
sudo rm -rf /data/db/dump/*
sudo docker exec -it some-mongo bash -c 'cd /data/db; mongodump'
sudo docker stop some-mongo
sudo docker rm   some-mongo

# Load upgraded data into latest version of MongoDB (WiredTiger storage engine will be used)
mongorestore /data/db/dump
sudo rm -rf /data

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