[SOLVED] Swap Partition

Nemesissparadise · 01-09-2019, 11:42 PM

I just installed Fedora 29 on my laptop. I did a fresh install from a previous version. On the system Monitor resource tab it states swap unavailable. The File systems tab states I have 3.6 gb of swap available. Is the system just not using swap and that's why it's not available on the resource tab or is Fedora not finding swap to use? If it's the latter can I fix this without reinstalling? My Linux knowledge is probably beginner to Mid level, I have been running Linux since about the time Fedora 1 so I am fairly familiar with How Fedora works and I have never seen this, have I just been blissfully ignorant in the past? I set this install up like I always do. I am somewhat comfortable using the terminal if I have good instructions. A new install wouldn't be horrible other than the time spent as my home directory is its own partition.

mrmazda · 01-10-2019, 12:04 AM

Does the swap partition's UUID from blkid output match the UUID used by fstab's swap entry, and grub.cfg's linux lines? They need to, unless mounting is being done by LABEL, in which case the LABELs must match.

Nemesissparadise · 01-10-2019, 12:23 AM

To sound stupid lol, IDK, How do I check?

GlennsPref · 01-10-2019, 12:25 AM

Hi,

Do you have an entry for the swap in /etc/fstab?
mine looks like this,

Code:

...
# Entry for /dev/sdb3 :
UUID=f9853eb1-ff74-4bd1-b48e-f9f5995a05fd swap swap defaults 0 0

If it's not there you could add the entry yourself, if the uuid is a worry, just use the /dev/ address in it's place
Like this

Code:

...
# Entry for /dev/sdb3 :
/dev/sdb3 swap swap defaults 0 0

I could use a gui like GParted to check the swap partition, even to the point of deleting it and re-configuring it in the same place.

Like you I have a separate /home partitions so not too painful if I have to reinstall the OS

I hope this helps, Glenn

Nemesissparadise · 01-10-2019, 12:35 AM

I couldn't find that directory nor could I cd to it in the terminal. I am not sure how to add it via terminal since Fedora doesn't allow gui login to root. GParted also doesn't show a swap partition.

GlennsPref · 01-10-2019, 01:07 AM

If the swap partition was there and verified it would show in gparted.
The un-partitioned space should also show...

type

Code:

cat /etc/fstab

to edit use you favourite text editor, I use nano, some use vi, or kate in a gui.

Code:

nano /etc/fstab

mrmazda · 01-10-2019, 01:15 AM

Output from blkid will show which partition, if any, is swap, and its UUID.

You can login as root on Fedora's vttys, such as you get using Ctrl-Alt-F3.

In a terminal or a vtty, using mc to navigate filesystems, persuse files, edit text files, copy & rename files and much more is easy. If mc is not installed, install it, using sudo if necessary:

Code:

dnf install mc

Nemesissparadise · 01-10-2019, 02:48 AM

I am not sure what this means I see it lists a swap but beyond that I can't glean much else

# blkid
/dev/sda1: SEC_TYPE="msdos" UUID="323D-CA50" TYPE="vfat" PARTLABEL="EFI System Partition" PARTUUID="a97b288f-c566-4212-885b-a7de10da8d36"
/dev/sda2: UUID="3daa894b-f062-4b7f-b4da-5ddfcfed539e" TYPE="ext4" PARTUUID="6ec2fd65-0a6f-45de-bad0-56b255089e37"
/dev/sda3: UUID="2mfuYK-c2gG-sQEf-YdwW-lFU8-m23E-Yct0Lz" TYPE="LVM2_member" PARTUUID="1ad004bf-2e3c-42b9-8813-e73bca06acb0"
/dev/mapper/fedora-root: UUID="220c3af6-8748-488c-822a-fb4453971d34" TYPE="ext4"
/dev/mapper/fedora-home: UUID="f9c6e6bb-14ec-49f4-a32f-56a5995b9fc8" TYPE="crypto_LUKS"
/dev/mapper/fedora-swap: UUID="a20aec96-9358-430a-994d-53f2409e6794" TYPE="ext4"
/dev/mapper/luks-f9c6e6bb-14ec-49f4-a32f-56a5995b9fc8: UUID="98395f21-7ef7-43d3-9aaf-8a9117eddb7b" TYPE="ext4"

mrmazda · 01-10-2019, 03:19 AM

Quote:

Originally Posted by Nemesissparadise

I am not sure what this means I see it lists a swap but beyond that I can't glean much else

Code:

...
/dev/mapper/fedora-swap: UUID="a20aec96-9358-430a-994d-53f2409e6794" TYPE="ext4"
...

The UUID you see there needs to match exactly the UUID in the swap line in /etc/fstab. Does it?

ehartman · 01-10-2019, 06:42 AM

Quote:

Originally Posted by mrmazda

The UUID you see there needs to match exactly the UUID in the swap line in /etc/fstab. Does it?

And the "type=ext4" sounds wrong to me, a swap partition (or logical volume, in this case) should not have a file system on it. The OP may have reformmated the partition to a fs so that swap cannot find the swap header anymore.

mrmazda · 01-10-2019, 10:43 AM

Quote:

Originally Posted by ehartman

And the "type=ext4" sounds wrong to me, a swap partition (or logical volume, in this case) should not have a file system on it. The OP may have reformmated the partition to a fs so that swap cannot find the swap header anymore.

I missed that. We need to see his /etc/fstab if he wants help determining the optimal way to repair. In the mean time, he can avoid the problem by commenting the swap line in /etc/fstab.

lleb · 01-10-2019, 06:47 PM

Quote:

Originally Posted by Nemesissparadise

I am not sure what this means I see it lists a swap but beyond that I can't glean much else

# blkid
/dev/sda1: SEC_TYPE="msdos" UUID="323D-CA50" TYPE="vfat" PARTLABEL="EFI System Partition" PARTUUID="a97b288f-c566-4212-885b-a7de10da8d36"
/dev/sda2: UUID="3daa894b-f062-4b7f-b4da-5ddfcfed539e" TYPE="ext4" PARTUUID="6ec2fd65-0a6f-45de-bad0-56b255089e37"
/dev/sda3: UUID="2mfuYK-c2gG-sQEf-YdwW-lFU8-m23E-Yct0Lz" TYPE="LVM2_member" PARTUUID="1ad004bf-2e3c-42b9-8813-e73bca06acb0"
/dev/mapper/fedora-root: UUID="220c3af6-8748-488c-822a-fb4453971d34" TYPE="ext4"
/dev/mapper/fedora-home: UUID="f9c6e6bb-14ec-49f4-a32f-56a5995b9fc8" TYPE="crypto_LUKS"
/dev/mapper/fedora-swap: UUID="a20aec96-9358-430a-994d-53f2409e6794" TYPE="ext4"
/dev/mapper/luks-f9c6e6bb-14ec-49f4-a32f-56a5995b9fc8: UUID="98395f21-7ef7-43d3-9aaf-8a9117eddb7b" TYPE="ext4"

Looks like something is amiss on your system. I just performed a fresh install, manual setup for partitions as i did not want to use LVM scheme:

Code:

user@workstation Downloads]$ cat /etc/fstab 

#
# /etc/fstab
# Created by anaconda on Wed Jan  9 18:21:47 2019
#
# Accessible filesystems, by reference, are maintained under '/dev/disk/'.
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info.
#
# After editing this file, run 'systemctl daemon-reload' to update systemd
# units generated from this file.
#
UUID=17535026-1669-46fe-9cac-f3d39b89ca5b /                       ext4    defaults        1 1
UUID=b8c25ce1-6a04-4873-8824-93bbc68b5e51 /boot                   ext4    defaults        1 2
UUID=1717-8D5C          /boot/efi               vfat    umask=0077,shortname=winnt 0 2
UUID=edfbf070-902a-4371-8943-7ddee3b48e8a /home                   ext4    defaults        1 2
UUID=d9cf277d-4175-4f16-8c2a-049cc70425bb /stuff                  ext4    defaults        1 2
UUID=1a1a2bef-b944-4e4e-98b4-132c1f6ae6e3 swap                    swap    defaults        0 0
[user@workstation Downloads]$ su -
Password: 
[root@workstation ~]# blkid
/dev/sda1: UUID="edfbf070-902a-4371-8943-7ddee3b48e8a" TYPE="ext4" PARTUUID="4a131f65-a87d-4e0b-87b6-a89510733a20"
/dev/sdb1: UUID="5C8C-D428" TYPE="vfat" PARTLABEL="EFI system partition" PARTUUID="704ce167-3b69-44ed-aa81-e2b4bcfcd663"
/dev/sdb2: SEC_TYPE="msdos" UUID="1717-8D5C" TYPE="vfat" PARTLABEL="EFI System Partition" PARTUUID="f20372ed-d7d0-4053-84d4-1174b6588ee8"
/dev/sdb3: UUID="17535026-1669-46fe-9cac-f3d39b89ca5b" TYPE="ext4" PARTUUID="ce0756e4-6c3a-4883-be8d-e3313a2d6758"
/dev/sdb4: UUID="1a1a2bef-b944-4e4e-98b4-132c1f6ae6e3" TYPE="swap" PARTUUID="f2c78b43-05c3-487d-8e34-60fe7c214dc8"
/dev/sdb5: UUID="b8c25ce1-6a04-4873-8824-93bbc68b5e51" TYPE="ext4" PARTUUID="3570667b-28b0-499c-9859-0e2b2138a84c"
/dev/sdb6: UUID="d9cf277d-4175-4f16-8c2a-049cc70425bb" TYPE="ext4" PARTUUID="9f26ed46-fbbf-400c-a7d6-d528c41b894f"
/dev/sdc1: LABEL="WD Passport" UUID="FEFAE9F0FAE9A55D" TYPE="ntfs" PTTYPE="atari" PARTLABEL="Basic data partition" PARTUUID="6f8ff4c7-6d0f-4974-9916-1b341e5b27ee"

Note the 2 bold font lines. Both have type=swap, not ext4.

Nemesissparadise · 01-11-2019, 01:19 AM

Quote:

Originally Posted by ehartman

And the "type=ext4" sounds wrong to me, a swap partition (or logical volume, in this case) should not have a file system on it. The OP may have reformmated the partition to a fs so that swap cannot find the swap header anymore.

When I try an open that directory it tells me it does not exist. If I did that my bad, didn't mean to.

mrmazda · 01-11-2019, 01:23 AM

Quote:

Originally Posted by Nemesissparadise

When I try an open that directory it tells me it does not exist.

Is "that directory" a reference to /etc/fstab? That's an important file, not a directory. If not, what is the "directory" to which you refer?

Nemesissparadise · 01-11-2019, 01:50 AM

Quote:

Originally Posted by mrmazda

Is "that directory" a reference to /etc/fstab? That's an important file, not a directory. If not, what is the "directory" to which you refer?

I stand corrected I should have been more clear and also used file. I cannot find the file.