The biggest problem of frequent disconnection of high-defense game servers lies in resource overload, network defects and defense failure. It is necessary to disassemble the use process of high-defense game servers, and the core reasons and corresponding solutions are summarized in this article.
1. In-depth analysis of the root cause of disconnection
The hardware performance bottleneck is mainly insufficient hardware configuration, which is the primary cause of disconnection. CPU overload (> 90%), memory exhaustion leading to OOM Killer forced termination of the process, and high disk I/O latency (> 20ms) will cause service interruption. Especially when the burst traffic exceeds the hardware carrying capacity, the server crashes directly due to resource contention.
The defects of the network architecture are reflected in the bandwidth of less than 50Mbps, which is instantly occupied under DDoS attacks, and legitimate traffic is squeezed out of the queue; there are also cross-border links with route degradation (such as China-US transmission) due to BGP route shock, causing more than 30% packet loss; in the cleaning of false positives, the high-defense equipment's overly strict strategy judges normal player data packets as attack traffic, resulting in connection interruption.
Failure of security protection, such as when the defense exceeds the limit, when the 300G defense bandwidth encounters a 500G attack, the service is completely paralyzed; when the adjacent server sharing the high-defense IP is attacked in the side effect of cluster defense, the packet loss rate of the server itself will soar; Trojans have PHPDDoS Trojans that launch traffic attacks inside the server, consuming 90% of bandwidth resources.
Improper software and operation and maintenance, such as unoptimized operating system kernel parameters (such as TCP half-connection queue is too small). Game service process memory leaks exhaust 64GB of memory within 24 hours; firewall rules incorrectly block game communication ports (such as UDP 7777).
2. Efficient processing solutions
Hardware and architecture optimization Through dynamic expansion strategy, real-time monitoring of CPU/memory: Setting threshold alarms through `htop` (CPU＞85% automatically triggers expansion), hierarchical storage design:
Hot data: NVMe SSD RAID 10 (IOPS＞500K);
Cold data: SATA HDD archiving.
Network link enhancement uses BGP multi-line access to deploy three-line BGP (China Telecom + China Unicom + China Mobile) to reduce cross-network latency, continuously monitors the quality of routing jumps through the `mtr` tool, and uses an intelligent scheduling system to mark traffic priorities using IPtables:
iptables -A OUTPUT -p udp --dport 7777 -j DSCP --set-dscp-class EFCombined with SD-WAN to automatically switch to the optimal path, the latency fluctuation is compressed to less than 5%.
Security protection enhancement
1. Layered defense system
| Level | Technical means | Function |
| Network layer | Anycast traffic scheduling | Disperse attack traffic to multiple cleaning centers |
| Application layer | Web application firewall (WAF) | Intercept CC attacks and malicious protocol packets |
| Host layer | HIDS intrusion detection | Real-time blocking of PHPDDoS Trojan behavior |
2. Elastic protection mechanism
Purchase cloud high-defense services that can be elastically expanded to 1Tbps, automatically trigger expansion when encountering over-limit attacks, and deploy independent IP high-defense and non-high-defense IP in a mixed manner, and isolate core services to exclusive protection IPs.
Automated operation and maintenance
1. Real-time diagnostic tool chain
Packet loss tracing:
tcpping -C 192.168.1.1:7777 # Continuously test the connectivity of the game port
tcpdump -i eth0 'udp port 7777' -w game.pcap # Packet capture and analysis of protocol anomaliesAttack fingerprint identification: Extract the signature code of the attack traffic (such as fixed Payload header) through `tshark`, and dynamically update the firewall blacklist.
2. Resource isolation and self-healing
Containerized deployment:
```dockerfile
# Limit single container resources
CGROUP_CPU=2 CGROUP_MEM=4G docker run --name game-serverCombined with Kubernetes, automatically restart the instance within 15 seconds when the process crashes;
Log-driven operation and maintenance: The ELK cluster analyzes the game log in real time, and triggers security isolation when the "repeated abnormal login" mode is found.
Service provider collaboration
1. Establish an SLA guarantee mechanism
Require service providers to provide cleaning event reports (including attack type, peak value, and handling results);
Sign a 4-hour fault recovery SLA, and delay compensation is charged by the minute.
2. Joint attack and defense drills
Simulate mixed attacks of more than 300G (SYN Flood+HTTP Slowloris) every quarter to verify the effectiveness of protection strategies and optimize the rule false kill rate to <0.1%.
III. Verification and effect improvement
A MOBA game has been significantly improved after adopting the above solution: the CPU peak load at the hardware level has dropped from 98% to 75%, and the number of daily downtimes caused by memory leaks has returned to zero; at the network level, CN2 GIA line + Anycast scheduling has stabilized the delay of Asian players at 35ms±3ms; at the security level, attacks below 50G are 100% automatically cleaned, and the service interruption time under 500G attacks is reduced from 30 minutes to 42 seconds.
Ultimate optimization direction: Build a closed-loop system of dynamic resource perception → intelligent attack cleaning → lossless service switching. The key command `nvidia-smi` monitors GPU load (if using GPU physics engine) and `netstat -s` analyzes packet loss protocol layer, supplemented by BGP routing health report provided by the service provider, which can systematically eliminate the problem of high-defense server disconnection.
