Docker provides a handy tool called docker stats that allows users to monitor various metrics related to running containers in real-time. In this blog post, we will explore Docker stats and how it can be utilized to gain insights into container resource usage.
Understanding Docker Stats
Docker stats provides a real-time stream of performance data for running containers. This information includes CPU usage, memory usage, network activity, and block I/O. With docker stats, you can quickly assess the health and resource utilization of your containers.
Usage
To get started, open a terminal and use the following command:
[root@siddhesh ~]# docker stats cdba0562a15c
CONTAINER CPU % MEM USAGE / LIMIT MEM % NET I/O BLOCK I/O PIDS
cdba0562a15c 0.00% 3.559 MiB / 15.33 GiB 0.02% 11.3 kB / 11.5 kB 0 B / 0 B 5where,
CONTAINER ID: The unique identifier for the container.
CPU %: The percentage of CPU usage.
MEM USAGE / LIMIT: The current memory usage and the memory limit.
MEM %: The percentage of memory usage.
NET I/O: Network Input/Output.
BLOCK I/O: Block Input/Output.
Understanding the Metrics
CPU %: This metric represents the percentage of CPU resources used by the container. A value of 100% indicates that the container is using all available CPU resources.
MEM USAGE / LIMIT: This shows the current memory usage and the memory limit set for the container. If the memory usage approaches the limit, it may lead to performance issues.
MEM %: The percentage of memory usage compared to the container's memory limit.
NET I/O: This indicates the amount of data sent and received over the network by the container.
BLOCK I/O: Represents the block input/output operations.
Docker stats is a valuable tool for troubleshooting container performance issues. If a container is exhibiting unexpected behavior or performance degradation, monitoring its resource usage with docker stats can help identify the root cause.
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