wrote article on cert renewal

content/Linux/Certbot well-known auto renew.md

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+This is translation of article from [clsv.ru](https://clsv.ru/linux/lets_encrypt_eto_legko_i_prosto_60), which explains how to automate certbot's well-known, also known as HTTP challenge for wildcard certs renewal.
+
+You'll need 4 scripts:
+
+1. Authentication script, which will write authentication file:
+```shell
+#!/bin/bash
+echo $CERTBOT_VALIDATION > /var/www/html/.well-known/$CERTBOT_TOKEN
+```
+2. Cleanup script, that will delete that 
+```shell
+#!/bin/bash
+rm -f /var/www/html/.well-known/$CERTBOT_TOKEN
+```
+3. Initial cert acquiring script:
+```shell
+certbot certonly \
+  --preferred-challenges=http --manual \
+  --manual-auth-hook /path/to/auth.sh \
+  --manual-cleanup-hook /oath/to/clean.sh 
+  -d "vault48.org,*.vault48.org" \
+  --manual-public-ip-logging-ok
+```
+1. Renewal script itself to put it in crontab
+```shell
+certbot renew --manual-public-ip-logging-ok \
+  --manual-auth-hook /path/to/auth.sh \
+  --manual-cleanup-hook /path/to/clean.sh
+```
+
+Don't forget to configure your http server to serve `.well-known`.