yanokwa
(Yaw Anokwa)
1
Manual backups (local and to S3) work great, but automated backups don’t seem to work. Any ideas why?
Settings
Errors ~ 6 minutes after trigger
Job exception: Cannot allocate memory - fork(2)
/var/www/discourse/lib/backup_restore/backup_restore.rb:160:in `fork'
/var/www/discourse/lib/backup_restore/backup_restore.rb:160:in `start!'
/var/www/discourse/lib/backup_restore/backup_restore.rb:15:in `backup!'
/var/www/discourse/app/jobs/regular/create_backup.rb:8:in `execute'
/var/www/discourse/app/jobs/base.rb:154:in `block (2 levels) in perform'
Ram
root@discourse-app:/var/www/discourse# free -mh
total used free shared buff/cache available
Mem: 992M 664M 72M 137M 255M 50M
Swap: 2.0G 1.0G 1.0G
Falco
(Falco)
2
If you are constantly swapping 1GB, you need more memory on this server.
3 Likes
you probably are big enough that more memory is needed…1GB is enough.
1 Like
yanokwa
(Yaw Anokwa)
4
If it’s a RAM issue, why do manual backups work then?
I’m not entirely sure but that error is due to insufficient memory available.
yanokwa
(Yaw Anokwa)
6
I upgraded from 1 GB to 2 GB box and backups seem to be working now.
total used free shared buff/cache available
Mem: 2.0G 1.2G 276M 141M 544M 498M
Swap: 2.0G 28M 2.0G
If anyone else has this problem, I’d try a reboot first because the Ubuntu box had also recently had kernel upgrades, so maybe that was the issue.
2 Likes
pfaffman
(Jay Pfaffman)
7
If you run discourse-setup it will tweak the memory settings to take advantage of the additional memory.
JagWaugh
(Andrew Waugh)
8
Interesting - I didn’t realise that running discourse-setup could be done on an install which was already up and running.
1 Like
yanokwa
(Yaw Anokwa)
9
Hmm. Running the setup again sounds dangerous to my existing app.yml. Any idea what the tweaks are?
yanokwa
(Yaw Anokwa)
10
I answered my own question . According to https://github.com/discourse/discourse_docker/blob/master/discourse-setup, the tweaks to app.yml are:
# db_shared_buffers: 128MB for 1GB, 256MB for 2GB, or 256MB * GB, max 4096MB
# UNICORN_WORKERS: 2 * GB for 2GB or less, or 2 * CPU, max 8
2 Likes
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