It becomes so easy to host a WordPress CMS using its official Docker container image. If only 1 domain is available, it might be useful to serve WordPress from subdirectory, i.e https://$SITE_URL/blog/.

First, follow the official documentation (Method II) to setup WordPress installation in subdirectory.

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Use Method II (With URL Changes) to finish the installation

$ export SUBPATH="blog"
$ mv !($SUBPATH) $SUBPATH/
$ cp SUBPATH/index.php index.php
$ sed -i "s/wp-blog-header.php/$SUBPATH\/wp-blog-header.php/g"

Then configure Traefik label:

version: '3'
services:
	wordpress:
    	....
        labels:
            - 'traefik.enable=true'
            - 'traefik.http.routers.blog.rule=Host(`$SITE_URL`) && PathPrefix(`/blog`)'
            - 'traefik.http.routers.blog.entrypoints=https'
        ....
        
            - 'traefik.http.routers.blog.tls=true'