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[Unit]
Description=Certbot certificate renewal for Keycloak
Wants=certbot-keycloak.timer
[Service]
ExecStart=/opt/certbot/certbot-keycloak.sh
WorkingDirectory=/opt/certbot
[Install]
WantedBy=multi-user.target

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certbot/certbot-keycloak.sh Executable file
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#!/bin/bash
CERTBOT_VER=v1.30.0
CNT=keycloak_nginx_proxy
DOM=acceso.txs.es
NGINX=/opt/nginx-proxy
cd /opt/certbot
docker run --rm \
-v $(pwd)/conf:/etc/letsencrypt \
-v $(pwd)/var:/var/lib/letsencrypt \
-v $(pwd)/log:/var/log/letsencrypt \
-v $NGINX/acme:/acme \
certbot/certbot:$CERTBOT_VER certonly -n --webroot -w /acme -d $DOM
## Check if the Certbot execution modified the certificate in the expected path, then
## copy the new one to the NGINX install folder and restart its container.
cmp $NGINX/certs/keycloak-cert.pem conf/live/$DOM/fullchain.pem </dev/null >&0 2>&0
if [ $? -ne 0 ]; then
echo "Updating certificate in $CNT container"
cp -afL conf/live/$DOM/fullchain.pem $NGINX/certs/keycloak-cert.pem
cp -afL conf/live/$DOM/privkey.pem $NGINX/certs/keycloak-key.pem
docker restart -t 2 $CNT
else
echo "No new certificates detected: omitting installation in $CNT container"
fi

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[Unit]
Description=Run certbot-keycloak service every 5 days since the last time the unit was activated
Requires=certbot-keycloak.service
[Timer]
Unit=certbot-keycloak.service
OnUnitInactiveSec=5days
AccuracySec=12h
[Install]
WantedBy=timers.target