How to Configure LetsEncrypt-Cerbot in a Standalone Container - docker

Question

I'm trying to find simple documentation on running certbot in a docker-container, but all I can find is complicated guides w/ running certbot + webserver etc. The official page is kinda useless... https://hub.docker.com/r/certbot/certbot/ .I already have webserver separate from my websites and I want to run certbot on it's own as well.
Can anybody give me some guidance on how I could generate certificates for mysite.com with a webroot of /opt/mysite/html.
As I already have services on port 443 and 80 I was thinking of using the "host-network" if needed for certbot, but I don't really understand why it needs access to 443 when my website is served over 443 already.
I have found something like so to generate a certbot container, but I have no idea how to "use it" or tell it to generate a cert for my site.
Eg:
WD=/opt/certbot
mkdir -p $WD/{mnt,setup,conf,www}
cd $WD/setup
cat << 'EOF' >docker-compose.yaml
version: '3.7'
services:
certbot:
image: certbot/certbot
volumes:
- type: bind
source: /opt/certbot/conf
target: /etc/letsencrypt
- type: bind
source: /opt/certbot/www
target: /var/www/certbot
entrypoint: "/bin/sh -c 'trap exit TERM; while :; do certbot renew; sleep 12h & wait $${!}; done;'"
EOF
chmod +x docker-compose.yaml
This link has something close to what I need, (obviously somehow I need to give it my domain as an argument!)
Letsencrypt + Docker + Nginx
docker run -it --rm \
-v certs:/etc/letsencrypt \
-v certs-data:/data/letsencrypt \
deliverous/certbot \
certonly \
--webroot --webroot-path=/data/letsencrypt \
-d api.mydomain.com
I like to keep everything pretty "isolated" so I'm looking to just have certbot run in it's own container and configure nginx/webserver to use the certs seperatley and not have certbot either autoconfigure nginx or run in the same stack as a webserver.

Answer 1

Well I have been learing a lot about docker recently and i recently learned how to look at the Dockerfile. The certbot dockerfile gave me some more hints.
Basically you can append the follow to your docker-compose.yaml and it is as if appending to certbot on the CLI. I will update with my working configs, but I was blocked due to the "Rate Limit of 5 failed auths/hour" :(
See Entrypoint of DockerFile
ENTRYPOINT [ "certbot" ]
Docker-Compose.yaml:
command: certonly --webroot -w /var/www/html -d www.examplecom -d examplecom --non-interactive --agree-tos -m example#example.com
I will update with my full config once I get it working and will be including variables to utilize .env file.
Full Config Example:
WD=/opt/certbot
mkdir -p $WD/{setup,certbot_logs}
cd $WD/setup
cat << 'EOF' >docker-compose.yaml
version: '3.7'
services:
certbot:
container_name: certbot
hostname: certbot
image: certbot/certbot
volumes:
- type: bind
source: /opt/certbot/certbot_logs
target: /var/log/letsencrypt
- type: bind
source: /opt/nginx/ssl
target: /etc/letsencrypt
- type: bind
source: ${WEBROOT}
target: /var/www/html/
environment:
- 'TZ=${TZ}'
command: certonly --webroot -w /var/www/html -d ${DOMAIN} -d www.${DOMAIN} --non-interactive --agree-tos --register-unsafely-without-email ${STAGING}
EOF
chmod +x docker-compose.yaml
cd $WD/setup
Variables:
cat << 'EOF'>.env
WEBROOT=/opt/example/example_html
DOMAIN=example.com
STAGING=--staging
TZ=America/Whitehorse
EOF
chmod +x .env
NGinx:
server {
listen 80;
listen [::]:80;
server_name www.example.com example.com;
location /.well-known/acme-challenge/ {
proxy_pass http://localhost:8575/$request_uri;
include /etc/nginx/conf.d/proxy.conf;
}
location / {
return 301 https://$host$request_uri;
}
}
server {
listen 443 ssl;
listen [::]:443;
server_name www.example.com example.com;
# ssl_certificate /etc/ssl/live/example.com/fullchain.pem;
# ssl_certificate_key /etc/ssl/live/example.com/privkey.pem;
ssl_certificate /etc/ssl/fake/fake.crt;
ssl_certificate_key /etc/ssl/fake/fake.key;
location / {
proxy_pass http://localhost:8575/;
include /etc/nginx/conf.d/proxy.conf;
}
)
Updated Personal Blog --> https://www.freesoftwareservers.com/display/FREES/Use+CertBot+-+LetsEncrypt+-+In+StandAlone+Docker+Container