Memory Used - cgroup - container

What it does#

It reads the amount of memory, in bytes, used by the cgroup of a container. More information about cgroups can be found in the Linux manual pages.

Classname#

• MemoryUsedCgroupContainerProvider

Metric Name#

• memory_used_cgroup_container

Input Parameters#

• args
  • -s: container-ids separated by commas
  • -i: interval in milliseconds

By default the measurement interval is 100 ms.

./metric-provider-binary -i 100 -s 7f38a4c25fb8f9d5f8651d6ed986b3658dba20d1f5fec98a1f71c141c2b48f4b,c3592e1385d63f9c7810470b12aa00f7d6f7c0e2b9981ac2bdb4371126a0660a

Output#

This metric provider prints to Stdout a continuous stream of data. The format of the data is as follows:

TIMESTAMP READING CONTAINER-ID

Where:

• TIMESTAMP: Unix timestamp, in microseconds
• READING: The amount of memory, in bytes, used during the time interval
• CONTAINER-ID: The container ID that this reading is for

Any errors are printed to Stderr.

How it works#

The provider assumes that you have cgroups v2 enabled on your system. It reads from the memory.current file under sys/fs/cgroup/user.slice/user-<USER-ID>.slice/user@<USER-ID>.service/user.slice/docker-<CONTAINER-ID>.scope/

Currently, <USER-ID> is set to the calling user.