How to increase the size of the /dev/shm in docker

问题:

Currently When I create new docker container the size of the shared memory directory is limited to 64MB. But, I need to increase this size since my application depend on this shared memory. Is there any way to increase the size of /dev/shm in docker container? I heard that the 64MB is hard coded in the docker code, How to install docker from source and change the value of the /dev/shm?

回答1:

You can modify shm size by passing the optional parameter --shm-size to docker run command. The default is 64MB.

eg:

docker run -it --shm-size=256m oracle11g /bin/bash

回答2:

If you use docker-compose to set up your docker environment, it is also possible to set the shared memory in the docker-compose.yml configuration file (since the 3.5 version of the file format):

build:
  context: .
  shm_size: '2gb'

More info: https://docs.docker.com/compose/compose-file/#shm_size