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Migrate an existing Traefik v2 instance to v3 ​

Use this guide if you already run Traefik v2 with frappe_docker and want to upgrade to v3. It focuses on the image upgrade and the v3 routing rule changes that affect existing setups.

Note: The Traefik v2 -> v3 migration is complete. The provided overrides no longer set core.defaultRuleSyntax or per-router ruleSyntax labels, because v3 is the default rule syntax. Note: If you have a system that must continue to run on v2 despite EOL, you can pin v2 rule syntax with --core.defaultRuleSyntax=v2 in your Traefik service.

Before you start ​

Before migrating anything, it is always recommended to create a backup. Better safe than sorry. In particular, compose and .env should be backed up.

Quick upgrade summary ​

  1. Pull the updated repo
  2. Update env variables especially the updated SITES to SITES_RULE
  3. Regenerate the compose config and restart the stack

Multiple hostnames ​

v2 allowed comma-separated host lists inside Host(...). In v3 Traefik uses logical OR.

Before (v2):

Host(`a.example.com`,`b.example.com`)

After (v3):

Host(`a.example.com`) || Host(`b.example.com`)

Step 1: Replace SITES with SITES_RULE ​

All Traefik routing for HTTPS and multi-bench setups now uses SITES_RULE, which is a full v3 rule expression.

Single site:

SITES_RULE=Host(`erp.example.com`)

Multiple sites:

SITES_RULE=Host(`a.example.com`) || Host(`b.example.com`)

Step 2: Regenerate and start your compose config ​

Example for HTTPS:

sh
docker compose --env-file .env \
  -f compose.yaml \
  -f overrides/compose.mariadb.yaml \
  -f overrides/compose.redis.yaml \
  -f overrides/compose.https.yaml \
  config > ~/gitops/docker-compose.yml
sh
docker compose --project-name <project-name> -f ~/gitops/docker-compose.yml up -d

See Single Server Example

Step 3: Verify Traefik ​

After restarting, Traefik will be used in the new supported version 3.6 and the same URLs will be used for the instances when making adjustments. After that, the pages should be accessible as before via the proxy and, if using HTTPS, via HTTPS.

Rollback ​

If you need to rollback:

  1. Revert Traefik image to v2.11
  2. Restore the old SITES variable format and v2 rules
  3. Regenerate the compose config and restart