Security Guide Alibaba Cloud Singapore Region Server Data Encryption And Intrusion Detection Practice

1.

overview: security environment and threat background of alibaba cloud singapore

- alibaba cloud singapore region usually targets asia-pacific customers and has significant network latency advantages, but it faces high-frequency http attacks targeting e-commerce and apis.
- common threat types: ddos (l3/l4/l7), brute force cracking, web application sql/xxe injection, weak passwords and unpatched vulnerabilities.
- security objectives: ensure data confidentiality (rest/transmission encryption), integrity (intrusion detection and auditing), and availability (cdn and anti-ddos).
- compliance and kms: it is recommended to enable the kms provided by the cloud service for key life cycle management and record the keyusage audit log.
- monitoring requirements: each ecs must be configured with at least 5-minute granular network/cpu/disk monitoring. abnormal thresholds must be set based on historical traffic and linked to alarms.
- recommended sla strategy: the production environment uses multi-availability zone deployment and combines alibaba cloud load balancing and cdn for global distribution to achieve failover.

2.

data encryption practice: specific implementation of disk and transport layer

- disk encryption: use alibaba cloud kms and data disk encryption (sse) examples. the recommended algorithm is aes-256. the example disk encryption throughput: sequential read and write is about 300mb/s (ecs.c6.large + cloud disk essd).
- transport layer: enable https and force tls1.2/1.3, certificates are managed by alibaba cloud certificate service (cas) or automatically renewed using let's encrypt.
- key management: the kms key rotation period is recommended to be 90 days. in addition, the ip and requester (cloudtrail/actiontrail) of each call are recorded.
- application-level encryption: use field-level encryption for sensitive fields (such as user id cards, card numbers), use aes-gcm and retain random ivs and 32-byte tags.
- performance impact: enabling disk encryption affects iops by less than 5%. enabling tls terminal decryption can be placed at the slb/alb layer to reduce ecs load.
- sample command (csr/certificate deployment): openssl req -new -newkey rsa:2048 -nodes -keyout site.key -out site.csr (please save the private key safely in the console or operation and maintenance script).

3.

intrusion detection (ids/ips) deployment practices and rule strategies

- solution selection: host-level ids (such as wazuh/ossec) combined with network-level (suricata/zeek) can cover different scenarios.
- rule management: default rules + custom rules and enable whitelist, regularly update the rule base (daily or weekly updates are recommended).
- log volume and storage: a medium-load ecs (1000 qps) generates waf/ids logs of approximately 500mb/day. it is recommended that the logs be retained for 30 days and archived to oss.
- alarm policy: set thresholds according to severity (high: alert immediately and trigger blocking script; medium: email/work order; low: record audit).
- automated response: combined with alibaba cloud function computing or operation and maintenance orchestration (robot) to automatically block ips, adjust security groups or trigger traffic cleaning.
- performance tuning: network ids is recommended to be deployed on the mirror/traffic replication path or use cloud mirror services to avoid single-point bandwidth bottlenecks.

4.

cdn, ddos defense and domain name level linkage strategy

- cdn acceleration and protection: enable waf rules and url authentication on the alibaba cloud cdn front-end to reduce the direct connection pressure on the origin site, and cache static resources to increase the cache hit rate to 80%+.
- ddos protection: enable alibaba cloud anti-ddos pro/basic and observe peak attack traffic. in real cases, when the peak reaches 120gbps, cloud cleaning is used to restore business traffic to normal bandwidth.
- dns and domain name security: use alibaba cloud resolution and enable anti-hijacking and monitoring of the resolution service, and record dns query patterns to detect abnormal resolution requests.
- traffic scheduling: combine slb and multi-availability zone ecs, set the health check frequency for 30 seconds, and automatically switch if the abnormal threshold fails three times in a row.
- cost control: enable cleaning capabilities based on peak billing on demand. it is recommended to establish a traffic warning line (for example, 30gbps) for quick response and cost control.
- specific threshold examples: normal daily average bandwidth is 5gbps, abnormal attack trigger threshold is >20gbps, automatic linkage starts cleaning and notifies sre.

5.

real case: how an e-commerce platform encountered an l7 attack in singapore

- background: a cross-border e-commerce company's main website in singapore (domain name: shop.example.sg) has daily traffic of about 2,000 qps and peak bandwidth of 5gbps.
- attack process: a short-term l7 request flood was detected, the peak request volume suddenly increased to 15,000 qps, and the peak traffic reached 95gbps, affecting checkout and api response.
- disposal process: 1) trigger waf rules to intercept abnormal ua and rate abnormalities; 2) enable origin site protection through alibaba cloud cdn and increase cache ttl; 3) start anti-ddos pro cleaning, and resume business after the traffic is cleaned to 7gbps.
- post-analysis: the logs show that they are mainly automated brushing scripts. the source ips are concentrated in several proxy nodes. the recurrence rate dropped by 90% within 24 hours after using waf and ip blacklist ban.
- conclusions and improvements: optimize waf custom rules, enable verification code/behavior verification, increase the cache hit rate to 88%, and write key information into the audit table for traceability.

6.

server configuration examples and data display (table demonstration)

- the following table is a typical ecs and security component configuration example, which can be used as a reference for deployment in singapore.

components	example configuration	description/performance data
ecs instance	ecs.c6.large (2 vcpu / 4gb)	suitable for small and medium traffic api, network enhanced
system disk/data disk	mirror centos 7 + essd 200gb	sequential read and write about 300mb/s, random iops 10k+
disk encryption	kms+sse aes-256	encryption overhead <5%, key rotation 90 days
intrusion detection	suricata + wazuh	the log is about 500mb/day, and the rules are updated daily.
cdn/protection	alibaba cloud cdn + waf + anti-ddos pro	the cache hit rate target is 80%+, and the cleaning threshold is 20gbps.

- the table data is an example, and the instance specifications and cleaning strategy should be adjusted according to the actual business scale.
- recommended test: simulate peak traffic (for example, 10k rps) in the pre-release environment to verify the carrying capacity and alarm triggering logic of the waf/slb/backend pool.

7.

operation and maintenance suggestions and summary

- regular drills: conduct ddos and intrusion response drills every quarter and record sop improvement points.
- monitor alarms: establish multi-channel alarms (sms/email/enterprise wechat) and set up automated work order flow.
- least privilege: ecs instances and databases implement the principle of least privilege, and use vpc and security groups to fine-grained control of network access.
- backup and recovery: enable snapshots and cross-az backup, and define rpo/rto indicators (example: rpo 15 minutes, rto 30 minutes).
- continuous updates: timely patching, updating waf/ids rules, and auditing kms key usage to form closed-loop security management.
- conclusion: building a safe and reliable server system in alibaba cloud singapore requires encryption, detection, cdn and ddos collaboration. combining automation and drills can significantly reduce the risk of business interruption.