Question

我需要在主机上使用最新的Debian（9）或Ubuntu（17.0.4）来限制Docker容器中的CPU。

$ docker info
  Containers: 0
  Running: 0
  Paused: 0
  Stopped: 0
  Images: 1
  Server Version: 17.06.0-ce
  Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Native Overlay Diff: true
  Logging Driver: json-file
  Cgroup Driver: cgroupfs
  Plugins: 
    Volume: local
    Network: bridge host macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog
  Swarm: inactive
  Runtimes: runc
  Default Runtime: runc
  Init Binary: docker-init
  containerd version: cfb82a876ecc11b5ca0977d1733adbe58599088a
  runc version: 2d41c047c83e09a6d61d464906feb2a2f3c52aa4
  init version: 949e6fa
  Security Options:
    seccomp
  Profile: default
  Kernel Version: 4.9.20-std-1
  Operating System: Ubuntu 17.04
  OSType: linux
  Architecture: x86_64
  CPUs: 4
  Total Memory: 7.753GiB
  ID: 2JJV:EM37:VCY5:HVKQ:MUNV:VV5N:H247:XE5Q:VBFD:6VES:P62H:YXPJ
  Docker Root Dir: /var/lib/docker
  Debug Mode (client): false
  Debug Mode (server): false
  Registry: https://index.docker.io/v1/
  Experimental: false
  Insecure Registries:
    127.0.0.0/8
  Live Restore Enabled: false

  WARNING: No cpu cfs quota support
  WARNING: No cpu cfs period support

我环顾四周，但我还没弄清楚如何在Debian / Ubuntu上实际启用CFS报价/期限支持。每当我尝试使用--cpus或--cpu-shares时，我都会收到错误：

NanoCPUs can not be set, as your kernel does not support CPU cfs period/quota or the cgroup is not mounted.

主机使用4.9.20内核运行最新的Ubuntu，因此应该有支持。在Debian 9上也一样。有关如何安装cgroup的任何说明或一个很好的教程？

Answer 1

请参阅CFS Bandwidth Control

上的内核文档

在内核中启用：

General setup --->
    -*- Control Group support ---> 
        -*- CPU controller --->
            -*- Group scheduling for SCHED_OTHER
               [*] CPU bandwidth provisioning for FAIR_GROUP_SCHED

Caveat Emptor：在重新编译和安装发行版未提供的内核之前，请确保您知道自己在做什么。考虑UEFI安全启动，并从当前的.config开始。

如何在Debian / Ubuntu中启用CFS cgroup支持

1 个答案: