Number of CPUs. Number is a fractional number. Only effective on NUMA systems. In microseconds.
Requires parent cgroups be set and cannot be higher than parent. Also check rtprio ulimits. Number is a positive integer. Unit can be one of kb, mb, or gb.
Accepts an integer between 0 and Unit is optional and can be b bytesk kilobytesm megabytesor g gigabytes. If you omit the unit, the system uses bytes.
If you omit the size entirely, the system uses 64m. The container can use as much memory as needed. Memory reservation is a kind of memory soft limit that allows for greater sharing of memory. When memory reservation is set, Docker detects memory contention or low memory and forces containers to restrict their options it to a options it limit. Always set the memory reservation value below the hard limit, otherwise the hard limit takes precedence.
A reservation of 0 is the same as setting no reservation.
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By default without reservation options it reservation is the same as the hard memory limit. The following example limits the memory -m to M and sets the memory reservation to M. The following example set memory reservation to 1G without a hard memory limit. By default, kernel kills options it in a container if an out-of-memory OOM error occurs.
To change this behaviour, use the --oom-kill-disable option. The --oom-score-adj parameter can be changed to select the priority of which containers will be killed when the system is out of memory, with negative scores making them less likely to be killed, and positive scores more likely.
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The inability to swap makes it possible for the container to block system services by consuming too much kernel memory. For example, every process consumes some stack pages.
By limiting kernel memory, you can prevent new processes from being created when the kernel memory usage is too high. Kernel memory options it never completely independent of user memory. Instead, you limit kernel memory in the context of the user memory limit. There are three possible ways to set limits: Option Result U!
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Kernel memory is completely ignored. This setup is useful in deployments where the total amount of memory per-cgroup is overcommitted. Overcommitting kernel memory limits is definitely not recommended, since the box can still run out of non-reclaimable memory. In this case, you can configure K so that the sum of all groups is never greater than the total memory.
Docker run reference
Then, freely set U at the expense of the system's service quality. This configuration gives the admin a unified options it of memory.
It is also useful for people who just want to track kernel memory usage. To set this percentage for a container, specify a --memory-swappiness value between 0 and A value of 0 turns off anonymous page swapping. A value of sets all anonymous pages as swappable. By default, if you are not using --memory-swappiness, memory swappiness value will be inherited from the parent. To modify the proportion from the default ofuse the -c or --cpu-shares flag to set the options it to 2 or higher.
If 0 is set, the system will ignore the value and use the default of The proportion will only apply when CPU-intensive processes are running.
When tasks in one container are idle, other containers can use the left-over CPU time. The options it amount of CPU time will vary depending on the number of containers running on the system. For example, consider three containers, one has a cpu-share of and two others have a cpu-share setting of The remaining containers receive For example, consider a system with more than three cores. And usually --cpu-period should work with --cpu-quota.
In addition to use --cpu-period and --cpu-quota for setting CPU period constraints, it is possible options it specify --cpus with a float number to achieve the same purpose.
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The default value for --cpus is 0. For more information, see the CFS documentation on bandwidth limiting. Cpuset constraint We can set cpus in which to allow execution for containers.
We can set mems in which to allow execution for containers. For multiple CPUs, adjust the --cpu-quota as options it. This proportion is Note: The blkio weight setting is only available for direct IO.
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Buffered IO is not currently supported. The --blkio-weight flag can set the weighting to a value between 10 to Both read and write rates must be a positive integer.
You can specify the rate in kb kilobytesmb megabytesor gb gigabytes. The --device-read-iops flag limits read rate IO per second from a device.
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Additional groups --group-add: Add additional groups to run as By default, the docker container process runs with the supplementary groups looked up for the specified user.