How to export from Redis to MongoDB? (My database got wiped)

rbeer

I'm curious about the contents of two files:

/var/log/redis/redis-server.log

/path/to/nodebb/log/nodebb.log

Charly86

Hi guys,
Experienced the same last night too, and again today!
logs (redis,nginx,nodebb) says everything is fine, it's just amazing.
I wrote a blog article on this problem with all my configuration/log files and what I've done to investigate but with no luck
you can read full article here
Any ideas are welcome, since I'm not the 1st having this problem

@Pilvinen would you share your bash backup scripts ?

PitaJ

@Charly86 @Pilvinen @wellenreiter What version of redis are you guys on?

Charly86

Mine is Redis 2.8.17 (00000000/0) 64 bit

? Offline

I use Redis 3.0.5 and I got it running since May.
Never had a problem except once, but it was my own fold as I overwrote the database during a NodeBB upgrade.

Do you guys all use OVH?
I cannot confirm any of this issues for me Redis seems to just work fine.

Charly86

I'm using it since may, just some pains during upgrade else all works fine.

OVH as VM provider ? is that what you mean ? Yes correct I'm on a VPS over OVH with 2.6.32 kernel

? Offline

@Charly86 thats interesting. I would suspect OVH to be responsible for the failure. It could be the case that their RAM has certain problems. Maybe try a setup on Kimsufi (OVH - dedicated servers) and see if it occurs again.

Charly86

@AOKP
Seems that we came to the same results, after checked everything I suspected may be shared RAM on OVH (it will not be my first issue with OVH)
Just followed your link, worth trying kimsufi, thanks

? Offline

@Charly86 keep us updated. I am very curious now. Think its time to write Oles an email

Charly86

@AOKP
To be honest, server migration does take time that I do not have for now (especially after the crash of this week), in the meantime I need to keep OVH because my server is hosting different applications that I can't move at the same time. So of course I will try it for new application or test but for now my dirty fix would be upgrading redis (I just compiled latest 3.0.5, it's ok) or upgrade nodeBB to another db, but seems I need to pay for this one.

? Offline

@Charly86 it does not makes a lot of sense to compile a new version of Redis, which also has its difficuilties with OVH. If you want I can assist you, just PM me.

Pilvinen

That's just silly theory. I have been using the same 32 GB dedicated OVH server for several years and I've never had any RAM or any other issues with the server.

@AOKP said:

@Charly86 thats interesting. I would suspect OVH to be responsible for the failure. It could be the case that their RAM has certain problems. Maybe try a setup on Kimsufi (OVH - dedicated servers) and see if it occurs again.

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@Pilvinen sure? OVH is known for having its difficuilties here and there. The other question then would also be why I didn't lost my data.

And why all of you 3 (at least 2), who are using OVH have the same problem.

Charly86

@Pilvinen
You said it all you've got a "dedicated server", I've got a VPS which is slightly different because all resources are shared with other customers VM (on same physical server), so of course in your case it make no sense, but in mine, I'm not sure this is so silly

Pilvinen

But it seems like the same issue. Redis database gets destroyed randomly, but rarely.

Charly86

correct, I forgot you had the issue

? Offline

@Pilvinen well. Then you have to think what can cause Redis to destroy its database.

Corruption, seems like the most logical case.
And as Redis does not stores the database on your HDD it can only be the RAM.

Also the fact that both of you use OVH makes it a bit strange.

Charly86

@AOKP
I agree, upgrading to 3.0.5 will certainly not solve the issue, but does not hurt to try

PitaJ

@AOKP Well, it persists it to HDD on shutdown. Maybe the server was forced shutdown, and redis didn't have time to save, or the save corrupted the db?

Pilvinen

If it helps clarifying the issue - when I noticed the forum had crashed and database was gone I tried to use redis-cli to do a proper shutdown - I connected which worked fine and tried running commands - And I got no response to the commands like Redis normally gives.