debian and yum packages - is there a way we can set max mem % and CPU % limits?

Question

Is there a hard limit we can set on Debian and RPM packages? My thought is to put 20% CPU, 20% Memory and 200 MB Disk Usage hard limits. So the package can play within those limits and not beyond that.

On Googling I found bind and pam.limits can be used. Has anyone used this before? Are there any better approaches?

score 2 · Accepted Answer · answered May 08 '18 at 08:41

2

The package is just a container so it is unlikely to set a limit on that.

If your package installs a service, the best way to impose limits on services nowadays I think is to leverage the fact that systemd gives you easy access to cgroups ; control groups where you can set a number of resource limits.

For a service "foo" with set resource limits either in the unit file of foo.service itself or create for instance a foo.slice and set options such as:

CPUAccounting=true
CPUQuota=20%
MemoryAccounting=true
MemoryMax=bytes

answered May 08 '18 at 08:41

HBruijn

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Yes. It runs as a service. I'll look into this. Thanks for your answer – Mir Adnan May 08 '18 at 08:59
I have added this to /lib/systemd/system/my-package.service file. To test I have set the max memory to 1 MB. And it still consumes more than 1 MB. – Mir Adnan May 08 '18 at 11:21
Where do I place this? under [Service] block? – Mir Adnan May 08 '18 at 12:29
1

the settings are indeed valid in a `[Service]` block – HBruijn May 08 '18 at 14:24
I still see the service taking 23% of CPU and RAM. I have those attributes placed under `[Service]` block. – Mir Adnan May 08 '18 at 14:28
Is the systemd release > 213? – HBruijn May 08 '18 at 18:01
I am using Ubuntu 16.04. That has systemd version 229 – Mir Adnan May 09 '18 at 04:07
Could it be because of cores on the machine? The documentation says each the % can go beyond 100% based on the number of cores the machine has. – Mir Adnan May 09 '18 at 04:11
But if this is the case, then why is the memory still going beyond the threshold? I had set MemoryMax to 500MB, but when I was load testing it went beyond 1.5 GB RAM. I have now set MemoryHigh=10% and MemoryMax=15%. Is there something wrong I am doing here? – Mir Adnan May 09 '18 at 04:13

debian and yum packages - is there a way we can set max mem % and CPU % limits?

1 Answers1