Creating user password hash strings for user authorisation with traefik basic-auth middlewares
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# If not installed, install htpasswd:
jlmkr shell docker
apt update & apt install apache2-utils
# The user credentials can be applied as a label entry in an app's compose.yml file or as a line entry in a text file; these two methods can co-exist
# 
# When used as a label entry, all '$''s need to be escaped with a second '$'; sed can be used for this purpose
#
# Example: Create user authorisation credentials for users 'alice' with password 'test!234' and 'bob' with password 'test$678' for sonarr application using basic-auth
# First, assign middlewares to router in sonarr compose.yml file; this is required irrespective of the method chosen below; add the following label to sonarr's compose.yml file:
 - "traefik.http.routers.ROUTER_NAME.middlewares=MIDDLEWARES_NAME"  # replace ROUTER_NAME with appropriate name and replace MIDDLEWARES_NAME with whatever name you choose for this middlewares 
#
# userList method
# ---------------
mkdir /opt/stacks/traefik/users
echo $(htpasswd -nB alice) >> /opt/stacks/traefik/users/sonarr.txt
echo $(htpasswd -nB bob) >> /opt/stacks/traefik/users/sonarr.txt
# If not already present, add the following middlewares label to sonarr's compose.yml file  (if newly added/modified, requires sonarr restart)
 - "traefik.http.middlewares.MIDDLEWARES_NAME.basicauth.usersfile=/mnt/users/sonarr.txt"
# the above requires the following traefik compose file volume mount entry (if newly added/modified, requires traefik restart):
 /opt/stacks/traefik/users:/mnt/users
#
# app compose file label method
# -----------------------------
echo $(htpasswd -nB alice) | sed -e s/\\$/\\$\\$/g
echo $(htpasswd -nB bob) | sed -e s/\\$/\\$\\$/g
# Edit/add output of above to the basicauth.users label to sonarr's compose.yml file as follows (comma separated):
 - "traefik.http.middlewares.MIDDLEWARES_NAME.basicauth.users=alice:$$2y$$05$$kvFK1SXs5mOzYLXiWT0Bku8rLeUoZWZxBI5./jX/vkhEiYlN/xB1W,
    bob:$$2y$$05$$E2DeZC3L.wQxYMWlxhtTRusys23y4fabhvzOKTgKNMSzw9cweBeJK"
# above edit to sonarr's compose file requires sonarr restart