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docker - 如何限制容器内存大小?

我分别用两种linux系统部署Docker0.8,都没法限制容器的内存大小。具体情况如下:

  1. 用CentOS6.5【内核为3.10.5-3.el6.x86_64】做主机,新建容器,得到结果如下:
# docker run -i -t -d -m 512m centos /bin/bash   
WARNING: WARNING: Your kernel does not support swap limit capabilities. Limitation discarded.
9229fe1bac59992337e909cbc5a11f3e0fa81553ad7b136bec95a62181a251fd

该容器新建成功,但不能限制内存大小。

  1. Ubuntu 12.04【内核为3.8.0-38-generic】做主机,并且修正/etc/default/grub,更改$ GRUB_CMDLINE_LINUX="cgroup_enable=memory swapaccount=1"之后,新建容器,得到结果如下:
# sudo docker run -i -t -m 512m -d ubuntu /bin/bash
89d629ed37d63b67b49ed8c4c11cab653d61d5b85227bdd10c8a9a0a718c686e

看似未报错,登陆该新建的容器里面查看内存【free命令】,发现并未限制。

大家手头的主机都是什么系统,有没有这种情况?如何解决?盼回复,谢谢!

怪我咯怪我咯2761 days ago842

reply all(4)I'll reply

  • 怪我咯

    怪我咯2017-04-21 10:58:38

    The memory on

    in the free命令,看的是Hostcontainer.

    To check the memory limit of container use this:

    cat /cgroup/memory/lxc/{full_container_id}/memory.limit_in_bytes
    
    
    You can also check the restrictions of other resources under

    /cgroup/:

    ll /cgroup/
    总用量 0
    drwxr-xr-x 3 root root 0 3月  17 13:33 blkio
    drwxr-xr-x 3 root root 0 3月  17 13:33 cpu
    drwxr-xr-x 3 root root 0 3月  17 13:33 cpuacct
    drwxr-xr-x 3 root root 0 3月  17 13:33 cpuset
    drwxr-xr-x 3 root root 0 3月  17 13:33 devices
    drwxr-xr-x 3 root root 0 3月  17 13:33 freezer
    drwxr-xr-x 3 root root 0 3月  17 13:33 memory
    drwxr-xr-x 3 root root 0 3月  17 13:33 net_cls
    

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    0
  • PHP中文网

    PHP中文网2017-04-21 10:58:38

    Owner, I also encountered this problem when I was doing experiments with Ubuntu virtual machine. Please refer to here to solve it
    http://docs.docker.com/articles/runmetrics/
    The following are key excerpts

    If you want to enable memory and swap accounting, you must add the following command-line parameters to your kernel:

    $ cgroup_enable=memory swapaccount=1
    

    On systems using GRUB (which is the default for Ubuntu), you can add those parameters by editing /etc/default/grub and extending GRUB_CMDLINE_LINUX. Look for the following line:

    $ GRUB_CMDLINE_LINUX=""
    

    And replace it by the following one:

    $ GRUB_CMDLINE_LINUX="cgroup_enable=memory swapaccount=1"
    

    Then run sudo update-grub, and reboot.

    These parameters will help you get rid of the following warnings:

    WARNING: Your kernel does not support cgroup swap limit.
    WARNING: Your kernel does not support swap limit capabilities. Limitation discarded.
    

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  • 大家讲道理

    大家讲道理2017-04-21 10:58:38

    Does anyone know how to solve this problem on Centos6?
    My docker is 1.6.2, Centos is 6.6, and the kernel version is 3.10.81

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  • 黄舟

    黄舟2017-04-21 10:58:38

    @colin5063

    I am CentOS6.7, it should be almost the same

    I modified it/etc/grub.conf 在当前使用的内核的kernel项的最后加上cgroup_enable=memory swapaccount=1

    reboot

    Then cat /proc/cmdline you will find that the configuration has taken effect

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