Hey Everyone
I'm trying to migrate from V1.7 to V2.4 and flow this steps : https://traefik.io/blog/gradual-migration-from-traefik-1-to-2/ but not work for HTTPS ( HTTP redirecting work ) .
scenario that I try to resolve is : start with empty ( no routers configured ) traefik V2.4 that redirect https request to traefik V1.7 ( https)
my config :
docker-compose.yml
...
services:
traefik:
image: traefik:1.7.10-alpine
command: ${TRAEFIK_COMMAND---file}
restart: always
volumes:
- /var/run/docker.sock:/var/run/docker.sock:ro
- ${PWD}/traefik:/etc/traefik
- ${PWD}/traefik/acme:/etc/traefik/acme
traefik2:
image: traefik:v2.4
ports:
- 80:80
- 443:443
- 8080:8080
volumes:
- /var/run/docker.sock:/var/run/docker.sock
- ${PWD}/traefik2:/etc/traefik/
- ${PWD}/traefik2/acme:/etc/traefik/acme
command: >
--api.insecure
......
traefik.yml
entryPoints:
http:
address: :80
transport:
respondingTimeouts:
readTimeout: "60s"
writeTimeout: "60s"
https:
address: :443
transport:
respondingTimeouts:
readTimeout: "60s"
writeTimeout: "60s"
providers:
providersThrottleDuration: 2s
file:
directory: /etc/traefik/providers
providers.yml
http:
routers:
# Define a catch-all router that forwards requests to legacy Traefik V1.7
to-traefik:
# Catch all http domains (regex matches all strings)
rule: "HostRegexp({domain:.+})"
service: old-traefik-version
# Set the lowest priority, so this route is only used as a last resort
priority: 1
entryPoints: http
to-https-traefik:
# Catch all https domains (regex matches all strings)
rule: "HostRegexp({domain:.+})"
service: old-https-traefik-version
# Set the lowest priority, so this route is only used as a last resort
priority: 1
entryPoints: https
tls: {}
services:
old-traefik-version:
loadBalancer:
servers:
- url: http://traefik
old-https-traefik-version:
loadBalancer:
servers:
- url: http://traefik
middlewares:
middleware-retry:
retry:
attempts: 3
Solution : 
add third entryPoints : tls ( traefik.yml file )
add into the router https ( providers.yml ) : tls: {}
service to V1.7 traefik :
old-https-traefik-version:
loadBalancer:
servers:
- url: https://traefik