TFT

CRON Expressions for SSL Certificate Renewal

Automate your SSL certificate renewals with CRON. Generate expressions to run renewal checks daily or weekly, ensuring your website's HTTPS never breaks due to an expired cert.

CRON for SSL Certificate Renewal
Automate SSL/TLS certificate renewal with Let's Encrypt and Certbot
Domain Configuration
Customize the templates for your domain
Certbot Daily Check
Daily certificate renewal check
0 3 * * *

Daily at 3:00 AM

certbot renew --quiet --deploy-hook "systemctl reload nginx"

Standard Let's Encrypt auto-renewal

Certbot Weekly Check
Weekly certificate renewal check
0 4 * * 0

Every Sunday at 4:00 AM

certbot renew --quiet --post-hook "systemctl reload nginx"

Less frequent renewal checks

Twice Daily Check
Morning and evening renewal checks
0 6,18 * * *

6:00 AM and 6:00 PM daily

certbot renew --quiet --deploy-hook "systemctl reload nginx"

High-availability environments

ACME Daily Renewal
Daily ACME protocol check
0 2 * * *

Daily at 2:00 AM

acme.sh --cron --home /root/.acme.sh --reloadcmd "systemctl reload nginx"

ACME.sh or similar tools

Certificate Expiry Check
Check certificate expiry and alert
0 9 * * *

Daily at 9:00 AM

echo | openssl s_client -servername example.com -connect example.com:443 2>/dev/null | openssl x509 -noout -enddate

Monitoring and alerting

Monthly Manual Check
Monthly reminder for manual renewal
0 9 1 * *

1st of every month at 9:00 AM

echo "Check SSL certificates for example.com" | mail -s "SSL Certificate Check" [email protected]

Manual certificate management

Pre-Expiry Alert (30 days)
Alert 30 days before expiry
0 9 * * *

Daily at 9:00 AM

#!/bin/bash expiry=$(echo | openssl s_client -servername example.com -connect example.com:443 2>/dev/null | openssl x509 -noout -enddate) days_left=$(( ($(date -d "$(echo $expiry | cut -d= -f2)" +%s) - $(date +%s)) / 86400 )) if [ $days_left -lt 30 ]; then echo "SSL expires in $days_left days" | mail -s "SSL Alert: example.com" [email protected] fi

Early warning system

Multi-Domain Renewal
Renew certificates for multiple domains
0 3 * * *

Daily at 3:00 AM

certbot renew --quiet --deploy-hook "systemctl reload nginx"

Multiple domain management

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