How To: Set shm-size for container

Overview

A user wants to have better performance for their containers/builds in their private Kubernetes clusters using the Codefresh Runner(Hybrid).

Details

Note

• Must be using Hybrid only environments (no SaaS environments).
• By default, a user cannot modify this parameter. A feature-flag controls this on the Codefresh side. Please contact support to enable this.
• Once enabled, Launch Compositions will not work.

Patch Runtime Environment

Get the runtime Environment

codefresh get runtime-environments <runtme_env_name> -o yaml > runtime.yaml

Modify the dockerDaemonScheduler

dockerDaemonScheduler:
  volumeMounts:
    dshm:
      name: dshm
      mountPath: /dev/shm
  volumes:
    dshm:
      name: dshm
      emptyDir:
        medium: Memory

Apply the patch

codefresh patch runtime-environment <runtme_env_name> -f runtime.yaml        

Usage

Freestyle Step

This can only be done using the docker run command

version: '1.0'
steps:
  test_shm:
    image: docker
    commands:
      - docker run -d --shm-size=256m nginx
      - sleep 300

You can exec into dind pod to verify changes

Service Containers

Specify the shm_size as part of the services > composition section

version: '1.0'
steps:  
  test:
    image: docker
    commands:
      - echo "Hello world"
      - sleep 30
    services:
      composition:
        alpine:
          image: alpine
          command: sleep 10
          shm_size: 256m

You can exec into dind pod to verify changes