Modify sysctl parameters inside docker container

Question

I am running a 3 node swarm cluster and trying to launch services with

docker stack deploy

Below is my compose file

services:

  nginx:
   image: nginx:latest
   networks:
     - til-prod-network
   volumes:
     - type: bind
       source: /tmp/nginx/nginx.conf
       target: /etc/nginx/nginx.conf
   ports:
     - 83:80
  depends_on:
    - BLUE
  deploy:
    replicas: 1
    update_config:
    parallelism: 1
    delay: 10s
  restart_policy:
    condition: on-failure
  placement:
    constraints:
      - node.role == manager
  resources:
    reservations:
      memory: 4096M
    limits:
      memory: 4096M

  BLUE:
    image: dtr.xxx.xxx/cmdb:v1.26
    sysctls:
      net.core.somaxconn: 4096
    networks:
     - til-prod-network
    deploy:
     replicas: 2
     update_config:
     parallelism: 1
     delay: 10s
    placement:
      constraints:
        - node.role == worker
    resources:
      reservations:
         memory: 2048M
      limits:
         memory: 2048M

 networks:
   til-prod-network:
      external: true

But when i deploy this via docker stack deploy, it gives me error of "Unsupported option sysctls".

Docker docs says same.

What solution should i implement to modify sysctl inside containers when running in swarm mode.

score 2 · Answer 1 · answered Apr 24 '19 at 07:00

2

Sysctl support for docker swarm cluster added in Docker 19.03.0.

answered Apr 24 '19 at 07:00

Anatoly Kudryashov

43
6

score 1 · Answer 2 · edited Mar 14 '19 at 08:24

1

version compose file must be 3.
swarm will ignore key sysctls anyway

For now, no correct solutions exist

edited Mar 14 '19 at 08:24

danblack

12,130
2
22
41

answered Mar 13 '19 at 17:37

Dmitry

11
1

Modify sysctl parameters inside docker container

2 Answers2