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 here.

Classname

  • MemoryUsedCgroupContainerProvider

Metric Name

  • memory_used_cgroup_container

Input Parameters

  • args
    • -s: container-ids seperated 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.

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