HackMDAWS 共學 Week3: RDS, AuroraDB, ElastiCache
Host: Eric Chang
tags: AWS, ElastiCache, AuroraDB
目標: 每個 Part 需要做一些基本介紹，然後給出一個 Demo，讓大家了解對應服務使用上的細節
Part1: RDS
成員: AC, Gin
For relation database:
Postgres, MySQL, MariaDB, Oracle, Microsoft SQL Server, Aurora
RDS vs DB on EC2
- 免處理os方面的事情
- 自動幫你備份
- Read replicas (讀寫分離)
- 跨AZs for HA
- 自行設定維護時間
- Auto Scaling: set the Max storage value.
- EBS
- No SSH
Read Replicas
- 只能SELECT
- 最多5個
- 同AZ,跨AZ,跨區
- ASYNC (每隔5分鐘)
- 如果RR變動 需手動更新連線資訊
- 數據傳輸
AWS 跨AZ $$
RDS 跨AZ Free
RDS 跨區 $$
Multi-AZ (RDS AZs)
- SYNC
- One DNS (自動更新連線資訊)
- 自動災難轉移
- Not for scaling, No one can access
- Read replicas can be Standby
RDS AZ -> AZs
- No downtime
- Just click on modify
- 內部流程
1.snapshot
2.restore from snapshot
3.build SYNC
RDS Custom
- Ec2 + OS + Oracle/MS-SQL
- SSH
Aurora
- AWS 優化過 (更快更大)
工商時間 - MYSQL / Postgres
- 15 replicas vs MySQL 5 replicas
- Cost more, but efficient
- HA (瞬間故障轉移)
- Auto-scling ~128T
- 6 copies in 3 AZs
- Only ONE (Master) for read/write
- the others for read/restore
- Writer/Reader endpointer (load balancing) for connection level
- Restore at ANY time vs RDS at each 5-min
Part2: AuroraDB
成員: 大Leo, Rick, Saker
補充
Part3: ElastiCache
成員: Larry, Bear
