Detailed Explanation Of Malaysian CN2 VPS Backup And Security Protection Policies And Recommended Tools

1.

Overview: Why is it important to prioritize backup and security when using CN2 VPS in Malaysia

? - CN2 (China Telecom International Backbone Network) lines have clear advantages over mainland access latency and packet loss rates, making them suitable for deployment at target customer bases in Malaysia in China.
- Using CN2 VPS can reduce RTT by typically 40-80ms (depending on the node and carrier), but still faces risks such as DDoS and data loss.
- Enterprise-level businesses have high availability requirements, with SLA targets typically above 99.95%, necessitating mature backup and protection systems.
- Backup policies and security protection should be coordinated from the network layer, host layer, and application layer to avoid single points of failure.
- This article provides a list of tools, configuration examples, and real cases to facilitate engineers in implementing and practicing on the field.

2.

Threat and risk assessment (common attack types and examples of magnitude).

- Common attacks: SYN Flood, UDP Flood, HTTP GET/POST flood, Slowloris, application layer injection, and brute-force attacks.
- DDoS magnitude reference: Small attacks <1 Gbps, medium attacks 1-10 Gbps, large attacks 10-100+ Gbps; In real-world cases, 120 Gbps is considered a large-scale attack.
- Disk/hardware failure probability: The annual failure rate (AFR) per disk is usually 1-3%, making RAID/RAID-Z and regular backups essential.
- RTO (Recovery Time Objective) and RPO (Recovery Point Target) caused by accidental data deletion or application failure must be defined in advance. For example: RTO ≤ 1 hour, RPO ≤ 1 hour.
- Risk assessment results determine investment priority: whether to purchase professional cleaning services, whether to enable multi-node hot standby or synchronous replication.

3.

Server and network configuration recommendations (sample configuration and comparison table).

- Choose data centers that support CN2 or BGP multi-line: prioritize operators with CN2/China Telecom Direct Peering.
- Network interfaces and bandwidth: It is recommended to have at least a 1Gbps network card, with public bandwidth planned based on peak traffic + security redundancy (for example, a website peak of 200Mbps, with 2-3x redundancy reserved).
- Storage recommendations: system disk NVMe 50-100GB, data disk NVMe/SATA designed according to IOPS requirements and capacity, critical data using RAID or ZFS.
- Security advice: enable firewalls (nftables/iptables/CSF), SSH key authentication, change default ports, and harden kernel parameters.
- The table below shows three typical CN2 VPS configuration examples (values in the table are recommended references):

< td style="text-align:center;">1Gbps / 30-60ms

solution	CPU/memory	bandwidth / latency	storage
lightweight	2 vCPU / 4GB	100Mbps / 40-80ms	50GB NVMe
standard	4 vCPU / 8GB	300Mbps / 35-70ms	200GB NVMe
high availability	8 vCPU / 16GB	2x500GB NVMe RAID1

4.

Detailed explanation of backup strategies (examples of snapshots, incremental and offsite backup combinations).

- Local snapshots (such as LVM/ZFS or cloud vendor snapshots): Used for minute-level recovery, it is recommended to retain daily snapshots from the last 7 days and hourly snapshots from the last 24 hours.
- Incremental backup: Using rsync, restic, borg, or rclone to object storage saves bandwidth and storage; Example: RestiC increments backup sites every night.
- Offsite backup: Copy data to Singapore, Hong Kong, or China mainland (compliant allowed) as remote disaster recovery; it is recommended to back up at least two locations.
- Storage estimation example: Assuming total site data is 500GB, daily increment is about 5GB, retention strategy is 30 days, then approximate storage = initial 500GB + 5GB ×30 = 650GB (can be reduced to 200-400GB by deduplication compression).
- Automation and validation: Regularly check backup availability with crontab + validation scripts (such as weekly restore walkthroughs) to ensure RPO and RTO are achievable.

5.

Disaster recovery and automatic switchover (BGP, Keepalive, and CDN integration).

- Remote hot standby: The primary site is in Malaysia, the backup station is in Singapore/Hong Kong, and the database uses master-slave/asynchronous replication or cross-data center synchronization.
- BGP Elasticity: If using your own IP or hosting BGP, traffic can be diverted to the cleaning center or backup station via BGP announce/withdraw.
- Keepalived + VRRP: Used for internal VIP switching, combined with health checks (nginx probe) for second-level intranet switching.
- CDN/Anycast: Use a CDN at the application layer (Cloudflare, Akamai, or Alibaba Cloud CDN) to offload static traffic and provide initial DDoS mitigation.
- Drill recommendations: Conduct a quarterly switchover drill to record switching duration, data loss, and service availability metrics to optimize processes.

6.

Practical DDoS protection and tool recommendations

- Boundary protection: negotiate scrubbing services with upstream ISPs and set up black hole routing (BGP Flowspec) as a last resort.
- CDN priority: Enable CDN + WAF for web applications, recommending Cloudflare, Tencent Cloud CDN, or Alibaba Cloud CDN enterprise editions to resist high-traffic attacks.
- Host-level protection: Use nftables/iptables + ipset to limit speed (sample threshold: 1000 per IP concurrent connection> or 200 new connections per second > add to the blacklist).
- Apply rate limiting: nginx sets limit_conn and limit_req, and works with mod_security to block abnormal request modes.
- Automated response: Use fail2ban/OSSEC to identify brute-force attacks and automatically block them. If necessary, trigger notifications and switch to grayscale pages or read-only mode to protect the backend.

7.

Monitoring, alerts, and log management

- Metric monitoring: Prometheus + Grafana monitors CPU, memory, disk, network throughput, connection count, and application response time.
- Traffic analysis: Enable Netflow/sFlow or VPC Flow Logs, combined with traffic baseline to detect anomalies (e.g., spikes of 10x).
- Log centralization: Use ELK/EFK or Loki to collect access and error logs, making it easier to trace attack trajectories.
- Alert Policy: Set multi-level alerts (e.g., warning threshold 70% for resources, 90% severity threshold) and push alerts to Email/Slack/DingTalk.
- Regular drills: simulate traffic surges, disk failures, and node failures to verify monitoring alert links and emergency plans.

8.

Real cases and summaries (including data and configuration examples).

- Real case: An e-commerce company deployed CN2 VPS in Malaysia, configured with 8 vCPU/16GB, 1Gbps bandwidth, 2x500GB NVMe RAID1. The site experienced a 120 Gbps UDP flood attack lasting 45 minutes.
- Response process: Enable upstream cleaning (BGP redirect to the cleaning center), switch static resources to CDN, restrict source IPs, and enable ipset blacklist on host computers. End users perceive no obvious interruptions, RTO ≈ 10 minutes.
- Backup and Recovery: Daily backups are from restic to Alibaba Cloud OSS (off-site), with incremental 6GB of backup per night, monthly storage consumption of about 300GB (about 120GB after deduplication). Recovery tests showed that the single-warehouse recovery time was about 12 minutes.
- Configuration Example Summary: Host 8 vCPU/16GB, 1Gbps public network; Scheduled backup using restic+oss; Prometheus indicator acquisition interval: 15 seconds; nginx limit_req set to 10r/s.
- Summary recommendation: Leveraging the advantages of CN2 lines, it is essential to build multi-layer protection (CDN + cleaning + BGP + host protection) and implement verifiable backup/drill plans to ensure business continuity and compliance.