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Frautoincnam
Guru
Joined: 19 May 2017
Posts: 324
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 Posted: Wed Jul 14, 2021 2:19 pm Post subject: swapfile not on / not mouted at start |
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Hi,
I have a swap partition, and I want to add a swap file.
If this swap file is on root partition, all works fine, it is mounted at start with fstab :
| Code: | /dev/sdb1 / ext3 noatime,user_xattr 0 1
/swapfile none swap sw 0 0 |
But, if I put it on another disk/partition :
| Code: | /dev/sda5 /other ext3 acl,noatime,user_xattr 1 2
/other/swapfile none swap sw 0 0 |
It isn't mounted at start.
but swapon -a works.
Does mounting that swap file should "wait" for this partition (/dev/sda5) being mounted ? and how ? |
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figueroa
Advocate
Joined: 14 Aug 2005
Posts: 3005
Location: Edge of marsh USA
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| Posted: Thu Jul 15, 2021 5:20 am Post subject: |
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Yes, the partition with the swapfile has to be mounted first.
Probably the wrong way to solve this, but a way, would be to swapon your swapfile in /etc/local.d, with a delay if necessary, assuming your running openrc.
What's your use case for wanting a swapfile? If you need more swap, why not increase the size of your existing swap partition, or add another? Do you really use a lot of swap? Do you monitor it?
_________________
Andy Figueroa
hp pavilion hpe h8-1260t/2AB5; spinning rust x3
i7-2600 @ 3.40GHz; 16 gb; Radeon HD 7570
amd64/23.0/split-usr/desktop (stable), OpenRC, -systemd -pulseaudio -uefi |
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Frautoincnam
Guru
Joined: 19 May 2017
Posts: 324
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| Posted: Thu Jul 15, 2021 6:37 pm Post subject: |
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| figueroa wrote: | | What's your use case for wanting a swapfile? |
I need swap for 1) hibernate 2) compile because I can't have more RAM (gcc, mysql)
| Code: | | If you need more swap, why not increase the size of your existing swap partition, |
Not enough space. It's a small SSD (116GB).
that's finaly what I did. I resized my /dev/sd5, to create a swap partition. But it's less flexible than a swapfile, so I add to create a bigger one than the swap file.
| Quote: | | Do you really use a lot of swap? |
Rarely, but sometimes. Of course, in that case I can mount it manualy, except if I forget to do it before starting emerge. And in that case, I spend a lot of time for nothing. I have to add swap, than restart emerge.
I wanted to automaticaly create that swapfile when emerging certain packages but never found a simple solution with portage. So I prefer to mount it at start. |
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Hu
Administrator
Joined: 06 Mar 2007
Posts: 22598
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| Posted: Fri Jul 16, 2021 2:09 am Post subject: |
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As a tip, you should state under what init system you are operating. I had to chase down your old posts to see this is likely not a systemd system, and is therefore probably (but not necessarily) an openrc system.
Under openrc, /etc/init.d/swap is before localmount, so you cannot normally enable a swap file on a filesystem that is mounted by localmount, because it will not be available. You must override this ordering if you want to mount a swap file from such a filesystem. I think most people who use swap files put them on the root, so the init script does not handle this case.
As an aside, why are your filesystems ext3? |
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Frautoincnam
Guru
Joined: 19 May 2017
Posts: 324
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| Posted: Fri Jul 16, 2021 2:41 am Post subject: |
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| Hu wrote: | | As a tip, you should state under what init system you are operating. I had to chase down your old posts to see this is likely not a systemd system, and is therefore probably (but not necessarily) an openrc system. |
You're right, sorry.
| Quote: | | Under openrc, /etc/init.d/swap is before localmount, so you cannot normally enable a swap file on a filesystem that is mounted by localmount, because it will not be available. You must override this ordering if you want to mount a swap file from such a filesystem. |
It makes sense, I should have thought about it.
| Quote: | | As an aside, why are your filesystems ext3? |
For the HD, it is just because that's a very old disk and at the time, I didn't dare to use ext4.
On the other hand, indeed I see that my root is in ext3 in fstab, whereas it is mounted in ext4.
| Code: | $ grep sdb1 /etc/fstab
/dev/sdb1 / ext3 noatime,user_xattr 0 1
$ mount | grep sdb1
/dev/sdb1 on / type ext4 (rw,noatime) |
probably an error (corrected) on my part in fstab. As it is formatted in ext4, it is therefore correctly mounted, regardless of the fstab option. |
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netsplit
n00b
Joined: 10 Jun 2024
Posts: 6
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| Posted: Thu Aug 01, 2024 4:39 pm Post subject: |
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Had the same issue. This thread gave me the insight to fix it for myself. Documenting in case it helps someone else who finds this thread.
In my case:
the swapfile is a on a partition mounted at /home:
| Code: | sudo rc-update add swap default
sudo rc-update del swap boot |
This fixed the issue, as stated above the swap partition wasn't mounted, so moving the swap service to a later in boot runlevel worked. Deleting swap from boot is required because it won't start the service twice.
Note: I speak with the confidence only someone on the wrong side of the Dunning-Krueger affect could have. Specifically the swap service being on the boot runlevel is probably for a very good reason that I'm not privy to. So this fix could case problems. I don't know. |
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grknight
Retired Dev
Joined: 20 Feb 2015
Posts: 1899
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| Posted: Thu Aug 01, 2024 4:43 pm Post subject: |
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| netsplit wrote: | the swapfile is a on a partition mounted at /home:
| Code: | sudo rc-update add swap default
sudo rc-update del swap boot |
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A better solution is to edit /etc/conf.d/swap and remove the comments to what applies to you: | Code: | # If you are only using local swap partitions, you should not change
# this file. Otherwise, you need to uncomment the below rc_before line
# followed by the appropriate rc_need line.
#rc_before="!localmount"
#
# If you are using swap files stored on local file systems, uncomment
# this line.
#rc_need="localmount"
#
# If you are using swap files stored on network file systems or swap
# partitions stored on network block devices such as iSCSI, uncomment
# this line.
#rc_need="netmount" |
In the example quoted in this post, it would be the rc_before and the first rc_need |
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netsplit
n00b
Joined: 10 Jun 2024
Posts: 6
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| Posted: Fri Aug 02, 2024 9:17 pm Post subject: |
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| grknight wrote: | | netsplit wrote: | the swapfile is a on a partition mounted at /home:
| Code: | sudo rc-update add swap default
sudo rc-update del swap boot |
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A better solution is to edit /etc/conf.d/swap and remove the comments to what applies to you: | Code: | # If you are only using local swap partitions, you should not change
# this file. Otherwise, you need to uncomment the below rc_before line
# followed by the appropriate rc_need line.
#rc_before="!localmount"
#
# If you are using swap files stored on local file systems, uncomment
# this line.
#rc_need="localmount"
#
# If you are using swap files stored on network file systems or swap
# partitions stored on network block devices such as iSCSI, uncomment
# this line.
#rc_need="netmount" |
In the example quoted in this post, it would be the rc_before and the first rc_need |
Thanks! Was doing a long build but it finished, I tried that change and it works great! |
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