178 lines
3.7 KiB
Markdown
178 lines
3.7 KiB
Markdown
# Let's Encrypt
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Use [acme.sh](https://github.com/Neilpang/acme.sh/) for wholly self-contained Let's Encrypt certificates. This assumes CloudFlare DNS is used for authentication.
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*Note: You probably want to use a DNS provider/API so you don't have to expose a service to the outside world*
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*NOTE: You may want to use a filesystem on a USB disk instead of /var for the volumes setup in the below Docker command(s) to help reduce writes to the micro sd card*
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## Dependencies
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``` bash
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apt update
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apt install jq
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```
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## Prep
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Grab the acme.sh Dockerfile and update it to work with arm (32 or 64).
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``` bash
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mkdir -p /root/docker/acme.sh
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cd /root/docker/acme.sh
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wget https://raw.githubusercontent.com/Neilpang/acme.sh/master/Dockerfile
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sed -i '1s/^/ARG ALPINE=alpine:3.6\n/' Dockerfile
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sed -i '/FROM/c\FROM $ALPINE' Dockerfile
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mkdir /var/acme.sh
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chmod 700 /var/acme.sh
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```
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## Setup / Run
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Setup a basic update/run script with the adjusted upstream Dockerfile
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``` bash
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cat > /root/docker/acme.sh/acme.sh <<EOF
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#!/bin/bash
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LATEST=\`docker images --no-trunc acme.sh/acme.sh | awk '{print \$2}' | sort -r | head -n1\`
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RELEASE=\`curl -s https://api.github.com/repos/Neilpang/acme.sh/releases/latest | jq -r .tag_name\`
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if [ \$RELEASE == \$LATEST ]
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then
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echo "Already up to date"
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fi
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ARCH=\`arch\`
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ALPINE=""
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# Cleanup arch here
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if [ \$ARCH == "aarch64" ]
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then
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echo "64bit arm"
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ARCH="arm64"
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ALPINE="arm64v8/alpine"
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else
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echo "32bit arm"
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ARCH="arm"
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ALPINE="arm32v6/alpine"
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fi
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echo "Build parms"
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echo " \${RELEASE}"
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echo " \${ARCH}"
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echo " \${ALPINE}"
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echo "Running build"
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docker build \\
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--network host \\
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--build-arg ALPINE=\$ALPINE \\
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--file /root/docker/acme.sh/Dockerfile \\
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--tag acme_sh/acme_sh:\$RELEASE \\
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.
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echo "Running with latest release"
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# Cleanup existing container
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docker stop acme_sh
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docker rm acme_sh
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# Re-run/create container with latest image
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# daemon (for cron auto renews)
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docker run -itd \\
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-v "/var/acme.sh":/acme.sh \\
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--net=host \\
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--restart unless-stopped \\
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--name=acme_sh \\
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acme_sh/acme_sh:\$RELEASE daemon
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EOF
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chmod a+x /root/docker/acme.sh/acme.sh
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```
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## First Run
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Run ```cd /root/docker/acme.sh && /root/docker/acme.sh/acme.sh``` to get the container online. The following commands will get your Let's Encrypt certificates created.
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*Note: The above script(s) setup the container to auto-run for auto-renew purposes. If you think you'll miss your renew window, force update the certs*
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## Get Help
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``` bash
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docker exec acme.sh --help
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```
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## Renewals...
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If you're going to be on the go, you may want to force rewewal of your scripts ahead of any travel or longer periods of time away from the internet. The author recommends a simple script at ```/root/update_certs.sh``` or similar that calls the necessary command(s) from below.
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## Register a Let's Encrypt Account
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Only do this **ONCE**
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``` bash
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docker exec acme.sh \
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--register-account \
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--staging
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```
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## Issue Cert (CloudFlare DNS API)
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``` bash
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docker exec \
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-e CF_Email='[your cloudflare email]' \
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-e CF_Key='[your cloudflare api key]' \
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acme.sh \
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--issue \
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--cert-file /acme.sh/domain.tld/domain.tld.crt \
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--dns dns_cf \
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-d domain.tld \
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-d pi-hole-gui.domain.tld \
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-d syncthing-gui.domain.tld \
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-d nextcloud.domain.tld \
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--staging
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```
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## Force Renew All Certs (CloudFlare DNS API)
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``` bash
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docker exec \
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-e CF_Email='[your cloudflare email]' \
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-e CF_Key='[your cloudflare api key]' \
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acme.sh \
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--renew-all \
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--force \
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--dns dns_cf \
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--staging
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```
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## Revoke Cert
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``` bash
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docker exec acme.sh \
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--revoke \
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-d domain.tld \
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-d pi-hole-gui.domain.tld \
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-d syncthing-gui.domain.tld \
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-d nextcloud.domain.tld \
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--staging
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```
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