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78 lines
4.2 KiB
Markdown
78 lines
4.2 KiB
Markdown
# cast01–cast03 lab architecture
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## Goals
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Simulate production patterns on three isolated Alpine VMs with **shared config only** on NFS (`/shared/cluster/`). No database files on NFS — each node owns `/var/lib/mysql` locally.
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## Topology
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```text
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┌─────────────────────────────────────┐
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│ FE 10.7.0.10 (NFS export /shared) │
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└──────────────────┬──────────────────┘
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│ NFS (configs/scripts only)
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┌─────────────────────────────┼─────────────────────────────┐
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▼ ▼ ▼
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┌───────────┐ ┌───────────┐ ┌───────────┐
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│ cast01 │ async GTID │ cast02 │ async GTID │ cast03 │
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│ .16.236 │◄──────────────│ .16.237 │◄──────────────│ .16.238 │
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│ PRIMARY │ replica │ REPLICA │ replica │ REPLICA │
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│ MariaDB │ │ MariaDB │ │ MariaDB │
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│ nginx/php │ │ nginx/php │ │ nginx/php │
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└───────────┘ └───────────┘ └───────────┘
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▲ │ │
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└──────── writes + default reads ────────────────────────────┘
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(replicas: read-only, failover drill)
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```
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| Node | IP | MariaDB | App role (planned) |
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|------|-----|---------|-------------------|
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| cast01 | 10.7.16.236 | **Primary** (read/write) | Crashes console primary target |
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| cast02 | 10.7.16.237 | Replica (read_only) | App worker / read replica |
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| cast03 | 10.7.16.238 | Replica (read_only) | App worker / read replica |
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## MariaDB
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- **Engine:** MariaDB 11.8 (Alpine 3.24 packages — no edge required)
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- **Replication:** GTID async primary → two replicas (`server-id` 1/2/3)
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- **Bootstrap:** app DB dump over TCP (`--skip-ssl`); GTID position copied from primary; `replicate-do-db` filters ongoing binlog to app schemas only (avoids `mysql.help_topic` dump failures)
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- **Databases:** `androidcast_crashes`, `url_shortener` (schemas from project SQL in `/shared/cluster/sql/`)
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- **Credentials:** see `credentials.txt` (same lab password on all nodes)
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## PHP
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- **Version:** 8.3 (`php83-fpm`) on all nodes — matches modern Alpine; prod BE remains 8.1 until upgraded separately
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- **Socket:** `127.0.0.1:9000`
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## DNS
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Pending external records. Until then: `/etc/hosts` block maintained by `baseline.sh`.
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## Service split (selected for lab)
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| Service | Write DB host | Read DB host (lab default) | Future app path (local disk) |
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|---------|---------------|----------------------------|------------------------------|
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| Crashes / tickets / RA | cast01 | cast01 (cast02/03 for drill) | `/var/www/androidcast/` per node |
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| URL shortener API | cast01 | cast01 | `/var/www/url-shortener/` on cast03 |
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| Graphs ingest | cast01 | cast01 | shared crashes backend |
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App deploys stay on **local VM disk**, not NFS.
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## Operations
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```sh
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sudo sh /shared/cluster/scripts/baseline.sh # per-node baseline
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sudo sh /shared/cluster/scripts/mariadb-primary.sh # cast01 only
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sudo sh /shared/cluster/scripts/load-schemas.sh # cast01 only
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sudo sh /shared/cluster/scripts/mariadb-replica.sh # cast02 + cast03
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sudo sh /shared/cluster/scripts/verify-cluster.sh # any node
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```
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NFS mount may be `noexec` — always invoke scripts with `sh`.
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## Not in scope yet
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- ProxySQL / MaxScale (add if read splitting becomes necessary)
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- Galera multi-primary (overkill for 3-node lab; async matches prod BE migration path)
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- TLS between nodes (intra VLAN)
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