docker Run the operation of the specified memory

As follows:

-m,--memory          Memory limit, the format is numbers plus units, and the units can be  b,k,m,g . Minimum is  4M
--memory-swap         Memory + Total swap partition size limit. The format is the same as above. Must must -m Setting large 
--memory-reservation      Soft limits on memory. Same format as above 
--oom-kill-disable       Whether to block  OOM killer  Kill container, not set by default 
--oom-score-adj        Container is  OOM killer  The priority of killing, the range is [-1000, 1000] The default is  0
--memory-swappiness      Used to set the virtual memory control behavior of the container. Value is  0~100  Integer between 
--kernel-memory        Core memory limit. The format is the same as above, and the minimum is  4M

View examples:

[root@sannian ~]# docker run -d -m 1G --memory-swap 3G -p 9999:80 --restart=always --name gitlab twang2218/gitlab-ce-zh
a3254078a79a084f3f3bed5f4ade3e26c7d86951cd822d95b113227d75b00097

[root@sannian ~]# docker ps
CONTAINER ID    IMAGE          COMMAND       CREATED       STATUS          PORTS                  NAMES
a3254078a79a    twang2218/gitlab-ce-zh  "/assets/wrapper"  21 minutes ago   Up 2 minutes (healthy)  22/tcp, 443/tcp, 0.0.0.0:9999->80/tcp  gitlab

[root@sannian ~]# docker images
REPOSITORY                        TAG         IMAGE ID      CREATED       SIZE
twang2218/gitlab-ce-zh                  latest       18da462b5ff5    3 months ago    1.61GB
registry-vpc.cn-hangzhou.aliyuncs.com/wenty/jumpserver  latest       055f42f305f5    7 months ago    1.41GB
registry.cn-hangzhou.aliyuncs.com/wenty/jumpserver    latest       055f42f305f5    7 months ago    1.41GB
registry.jumpserver.org/public/jumpserver        1.0.0        055f42f305f5    7 months ago    1.41GB
registry.jumpserver.org/public/jumpserver        latest       055f42f305f5    7 months ago    1.41GB

Added: docker run-m Specified memory size does not work

When executing docker run, you want to specify the memory size under 1, and use the-m parameter

The error is reported as follows

#docker run -id -m 3g -p 7001:7001 197.3.16.51/sysmgr/mywebapptest_app_weblogic:20180820047 WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. 52380a4896f3f916cd0f95f97e233b30d9406840e10c0c53484b3be9000d0321

Then I found that even though I set the heap size to 5G, the container was created and the 3g limit was not in effect.

Looking up the data, we found that this error was reported because the related functions of the host kernel were not turned on.

Solutions

Just follow the following settings

step 1:

Edit the document /etc/default/grub and change line GRUB_CMDLINE_LINUX1 to read

GRUB_CMDLINE_LINUX="cgroup_enable=memory swapaccount=1"

step 2:

Update GRUB, that is, execute $sudo update-grub

step 3:

Restart the system.