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Re: Is there a way to make the pi use swap?

On Friday 14 September 2018 20:16:32 Alan Corey wrote:

> My /etc/fstab just has
>  /var/swap2 none swap sw 0 0
> That's for a swap file which was made by dding 0s into it, then
> running mkswap.
> You'd replace /var/swap2 with /dev/sda2
> Sounds like you're just not loading it from your fstab.  Should load
> every boot.  Nothing new or tricky there.

I found an error in the line above that in fstab, # it out.
Using htop as a swap monitor I can make the swap come and go.

Heres the fstab now:

proc                    /proc                   proc    defaults        0       0
PARTUUID=4fb6ef8f-01    /boot                   vfat    defaults        0       2
PARTUUID=4fb6ef8f-02    /                       ext4    defaults,noatime  0       1
# but lets see if a swap can be made to work
PARTUUID="000ba889-02"  none                    swap    defaults,nofail 0       0
#/dev/sda2      none    swap    sw,nofail
# a swapfile is not a swap partition, no line here
#   use  dphys-swapfile swap[on|off]  for that
LABEL=bootpi    /media/boot                     vfat    defaults        0       2
LABEL=workpi1   /media/slash            ext4    defaults,noatime        0       1
LABEL=backuppi  /media/backupsd         ext4    defaults,noatime        0       1
LABEL=workpi120 /media/work                     ext4    defaults,noatime        0	1

But it doesn't show in a mount, nor does it show in a cat /etc/mtab:

/dev/root / ext4 rw,noatime,data=ordered 0 0
devtmpfs /dev devtmpfs rw,relatime,size=468264k,nr_inodes=117066,mode=755 0 0
sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
proc /proc proc rw,relatime 0 0
tmpfs /dev/shm tmpfs rw,nosuid,nodev 0 0
devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
tmpfs /run tmpfs rw,nosuid,nodev,mode=755 0 0
tmpfs /run/lock tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k 0 0
tmpfs /sys/fs/cgroup tmpfs ro,nosuid,nodev,noexec,mode=755 0 0
cgroup /sys/fs/cgroup/systemd cgroup 
rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd 0 0
cgroup /sys/fs/cgroup/cpu,cpuacct cgroup rw,nosuid,nodev,noexec,relatime,cpu,cpuacct 0 0
cgroup /sys/fs/cgroup/blkio cgroup rw,nosuid,nodev,noexec,relatime,blkio 0 0
cgroup /sys/fs/cgroup/memory cgroup rw,nosuid,nodev,noexec,relatime,memory 0 0
cgroup /sys/fs/cgroup/devices cgroup rw,nosuid,nodev,noexec,relatime,devices 0 0
cgroup /sys/fs/cgroup/freezer cgroup rw,nosuid,nodev,noexec,relatime,freezer 0 0
cgroup /sys/fs/cgroup/net_cls cgroup rw,nosuid,nodev,noexec,relatime,net_cls 0 0
tmpfs /etc/machine-id tmpfs ro,mode=755 0 0
systemd-1 /proc/sys/fs/binfmt_misc autofs 
rw,relatime,fd=22,pgrp=1,timeout=300,minproto=5,maxproto=5,direct 0 0
debugfs /sys/kernel/debug debugfs rw,relatime 0 0
mqueue /dev/mqueue mqueue rw,relatime 0 0
configfs /sys/kernel/config configfs rw,relatime 0 0
fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0
/dev/mmcblk0p1 /boot vfat 
rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shortname=mixed,errors=remount-ro 0 0
/dev/sda1 /media/boot vfat 
rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shortname=mixed,errors=remount-ro 0 0
/dev/sdb1 /media/backupsd ext4 rw,noatime,data=ordered 0 0
/dev/sda3 /media/slash ext4 rw,noatime,stripe=8191,data=ordered 0 0
/dev/sdb2 /media/work ext4 rw,noatime,data=ordered 0 0
tmpfs /run/user/1000 tmpfs rw,nosuid,nodev,relatime,size=94520k,mode=700,uid=1000,gid=1000 0 0
gvfsd-fuse /run/user/1000/gvfs fuse.gvfsd-fuse rw,nosuid,nodev,relatime,user_id=1000,group_id=1000 0 0

Which seems to be way too complex, but htop says its there. But I did a swapoff -a
then a sudo mkswap .dev/sda2 which reported:
pi@picnc:~ $ sudo mkswap /dev/sda2
mkswap: /dev/sda2: warning: wiping old swap signature.
Setting up swapspace version 1, size = 10239996 KiB
no label, UUID=7b06d9bc-18f2-4c25-957d-f426141664b3

So I copied that UUID into /etc/fstab, making this line:
UUID=7b06d9bc-18f2-4c25-957d-f426141664b3 swap     defaults,nofail 0 0
But now its not working at all.  What did I screw up?

I rebooted, and its found a 99meg swapfile, probably on the 32GB u-sd,
but not /dev/sda2 ???

Call me puzzled.

Thanks Alan

Cheers, Gene Heskett
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>

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