container_memory_usage_bytes

[Daniel Watrous]

Hello,

 

I have question about how `container_memory_usage_bytes` is calculated. Right now I see in Prometheus that a container is consuming nearly 6GB of memory

When I run docker stats for that same container on the actual node, it shows that the container is using closer to 3GB.

 

CONTAINER ID    NAME                                                                                              CPU %     MEM USAGE / LIMIT     MEM %     NET I/O    BLOCK I/O         PIDS

c6379315a3c1    k8s_jenkins_jenkins-deployment-65b57446f6-twsbn_jenkins_e6223e7d-886e-11e9-8d56-fa163e6c897e_0    59.44%    3.12GiB / 5.588GiB    55.83%    0B / 0B    138MB / 60.4kB    187

 

Why does prometheus show almost double?

 

Daniel

[Chris Marchbanks]

Hi Daniel,

Docker stats calculates the memory usage by subtracting cache from the total memory usage, whereas container_memory_usage_bytes includes the cache. The container_memory_rss series from cAdvisor will also exclude the cache and will be close to what docker stats produces.

Chris

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