78 lines
3.1 KiB
Markdown
78 lines
3.1 KiB
Markdown
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# Restore MySQL (InnoDB Cluster)
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## Prerequisites
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- `kubectl` access to the cluster
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- MySQL root password (from `cluster-secret` in `dbaas` namespace, key `ROOT_PASSWORD`)
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- Backup dump available on NFS at `/mnt/main/mysql-backup/`
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## Backup Location
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- NFS: `/mnt/main/mysql-backup/dump_YYYY_MM_DD_HH_MM.sql`
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- Replicated to Synology NAS (192.168.1.13) via TrueNAS ZFS replication
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- Retention: 14 days
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- Size: ~11MB per dump
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## Restore Procedure
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### 1. Identify the backup to restore
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```bash
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# List available backups
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kubectl run mysql-ls --rm -it --image=mysql \
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--overrides='{"spec":{"volumes":[{"name":"backup","persistentVolumeClaim":{"claimName":"dbaas-mysql-backup"}}],"containers":[{"name":"mysql-ls","image":"mysql","volumeMounts":[{"name":"backup","mountPath":"/backup"}],"command":["ls","-lt","/backup/"]}]}}' \
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-n dbaas
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```
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### 2. Get the root password
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```bash
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kubectl get secret cluster-secret -n dbaas -o jsonpath='{.data.ROOT_PASSWORD}' | base64 -d
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```
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### 3. Option A: Restore via port-forward (from outside cluster)
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```bash
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# Port-forward to MySQL primary
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kubectl port-forward svc/mysql -n dbaas 3307:3306 &
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# Get root password
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ROOT_PWD=$(kubectl get secret cluster-secret -n dbaas -o jsonpath='{.data.ROOT_PASSWORD}' | base64 -d)
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# Restore (use --host to avoid unix socket, specify non-default port)
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mysql -u root -p"$ROOT_PWD" --host 127.0.0.1 --port 3307 < /path/to/dump_YYYY_MM_DD_HH_MM.sql
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```
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### 3. Option B: Restore via in-cluster pod
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```bash
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ROOT_PWD=$(kubectl get secret cluster-secret -n dbaas -o jsonpath='{.data.ROOT_PASSWORD}' | base64 -d)
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kubectl run mysql-restore --rm -it --image=mysql \
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--overrides='{"spec":{"volumes":[{"name":"backup","persistentVolumeClaim":{"claimName":"dbaas-mysql-backup"}}],"containers":[{"name":"mysql-restore","image":"mysql","env":[{"name":"MYSQL_PWD","value":"'$ROOT_PWD'"}],"volumeMounts":[{"name":"backup","mountPath":"/backup"}],"command":["mysql","-u","root","--host","mysql.dbaas.svc.cluster.local","<","/backup/dump_YYYY_MM_DD_HH_MM.sql"]}]}}' \
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-n dbaas
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```
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### 4. Verify restoration
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```bash
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# Check databases exist
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mysql -u root -p"$ROOT_PWD" --host 127.0.0.1 --port 3307 -e "SHOW DATABASES;"
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# Check InnoDB Cluster status
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mysql -u root -p"$ROOT_PWD" --host 127.0.0.1 --port 3307 -e "SELECT * FROM performance_schema.replication_group_members;"
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# Check table counts for key databases
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for db in speedtest wrongmove codimd nextcloud shlink grafana; do
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echo "=== $db ==="
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mysql -u root -p"$ROOT_PWD" --host 127.0.0.1 --port 3307 -e "SELECT TABLE_NAME, TABLE_ROWS FROM information_schema.TABLES WHERE TABLE_SCHEMA='$db' ORDER BY TABLE_ROWS DESC LIMIT 5;"
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done
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```
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### 5. InnoDB Cluster Recovery
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If the InnoDB Cluster itself is broken (not just data loss):
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```bash
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# Check cluster status via MySQL Shell
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kubectl exec -it mysql-cluster-0 -n dbaas -c mysql -- mysqlsh root@localhost --password="$ROOT_PWD" -- cluster status
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# Force rejoin a member
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kubectl exec -it mysql-cluster-0 -n dbaas -c mysql -- mysqlsh root@localhost --password="$ROOT_PWD" -- cluster rejoinInstance root@mysql-cluster-1:3306
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```
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## Estimated Time
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- Data restore: ~5 minutes (11MB dump)
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- InnoDB Cluster recovery: ~15-20 minutes (init containers are slow)
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