i have been trying to fine tune the docker compose settings but i am not satisfied with the result and the docs are so unspecific for the healthcheck and update_config options.
The scenario are react apps which need to run build and start during entrypoint execution. The builds can not be done on Dockerfile because then i would need to tag redundant images for each environment (amongst other inconveniences)
Because of the build and run steps the container is deployed and after the healthcheck will give a positive from node server it takes about 30 secs.
Now in a rollig update zero downtime scenario what settings would i use? The thing is i dont need more then 1 replica. The ideal config option would be wait_rolling_update_delay or something that would provoke docker to replace containers never before this wait time. i am playing around with the healthcheck.start_period but i am not seeing a difference.
deploy:
mode: replicated
replicas: 1
placement:
constraints:
- node.role == worker
labels:
- "APP=name"
- "traefik.http.services.name.loadbalancer.server.port=1338"
restart_policy:
condition: any
delay: 10s
max_attempts: 3
window: 60s
update_config:
parallelism: 1
delay: 10s
monitor: 10s
order: start-first
failure_action: rollback
healthcheck:
test: "curl --silent --fail http://localhost:1338/_health || exit 1"
interval: 10s
timeout: 120s
retries: 10
start_period: 120s
