container uses SWAP with no SWAP

[fropa]

I set SWAP = 0 on every container I've on Proxmox, but they still use swap for some processes. I can check that from 'top' command. What's wrong?

 

[wolfgang]

Hi,

what do you mean

I set SWAP = 0

a. set swappiness to 0
b. swapoff and remove fstab.

 

[fropa]

I can't change swappiness on a container, only on the host. I set swap = 0 from web and when I check 'free -m' command there is no swap.

 

[wolfgang]

Where did you see that you are using swap?
Because maybe you see the swap of the host.

 

[fropa]

Where did you see that you are using swap?
Because maybe you see the swap of the host.

I can view that in 'top' command. There Are some processes using SWAP that are not run on a host.

 

[wolfgang]

The problem is you can not disable swap in cgoups in version 1.
Version 2 is not supported by LXC yet.
Memory means swap + mem.
swap means only swap.

 

[fropa]

The problem is you can not disable swap in cgoups in version 1.
Version 2 is not supported by LXC yet.
Memory means swap + mem.
swap means only swap.

What do you mean in version 1 and version 2?


I guess I didn't explain correctly. I set swap 0 on each container separately from the web panel.

Do you mean that if I set swap 0 for the container it still would use swap?

 

[wolfgang]

Do you mean that if I set swap 0 for the container it still would use swap?

Yes

 

[fropa]

Thank u.

How I can turn off using swap finally?

 

[wolfgang]

You can turn off swap on the host.
swapoff <swap partition>
remove fstab swap entry.

 

[GKey]

@wolfgang
As setting swap to 0 seems to have no effect, does that mean that LXC Containers can use as much swap as they want ? Potentially one problematic LXC Container filling up all swap that's available ?

If yes, is there any best practice advice on this matter ?

 

[wolfgang]

Hi GKey
as I wrote,

Memory means swap + mem.
swap means only swap.

If you want 100% to avoid swap you can only remove it.