document MySQL Backup

README.md

@@ -92,6 +92,38 @@ Check, wer gebanned ist:
 ## Backup Server
 
 ```bash
+Backup MySQL-DBs:
+
+/usr/local/bin/backup-mysql-dbs.sh (sinngemaess, eine Zeile pro Container):
+root@moby:/usr/local/bin# more backup-mysql-dbs.sh 
+#!/bin/bash
+# Backup der MySQL DBs (Docker)
+#
+for container_name in $(docker ps --format "{{.Image}} {{.Names}}" |grep mysql  |awk '{print $2}'); do
+  if [ -f /usr/local/bin/${container_name}.pwd ]; then
+    # im pwd-File muss "PWD=XXXX" (root) gesetzt werden
+    . /usr/local/bin/${container_name}.pwd
+    docker exec ${container_name} /usr/bin/mysqldump -u root --password=${PWD} --all-databases > /backup/mysql-databases-${container_name}-$(date +%Y%m%W).sql 2>/dev/null
+  else
+    >&2 echo "Password must be set as PWD=XXXX in /usr/local/bin/${container_name}.pwd" 
+  fi
+done
+
+# Cleanup Old Backups
+find /backup -type f -mtime +30 -exec rm {} \;
+
+/etc/cron.d/backup-mysql-dbs: 
+# Backup MySQL DBs
+#
+45 5 * * * root /usr/local/bin/backup-mysql-dbs.sh >/dev/null
+
+
+Restore: just in case:
+cat backup.sql | docker exec -i CONTAINER /usr/bin/mysql -u root --password=root DATABASE
+
+
+
+
 # apt install restic
 # mkdir /backup
 # mkdir /backup-restic