Analyze The Protection And Monitoring Configuration Of Taiwan’s Local Vps Cloud Space From A Security Perspective

2026-08-16 22:43:05

Current Location： Blog > Taiwan VPS

Environment preparation and initial update

Steps:
1) Login: Use the console or SSH to log in to the Taiwanese VPS (for example: ssh root@your.ip.address).
2) Update the system (taking Debian/Ubuntu as an example): apt update && apt -y upgrade
3) Install common tools: apt -y install sudo ufw fail2ban rsync curl vim git

Create non-root administrative users with sudo permissions

Steps:
1) Create a new user and set a password: adduser deployer
2) Join the sudo group: usermod -aG sudo deployer
3) Disable root password login: edit /etc/ssh/sshd_config, set PermitRootLogin prohibit-password or no, and then systemctl restart sshd

SSH hardening (key login, port and anti-explosion)

Steps:
1) Generate key locally: ssh-keygen -t ed25519 -C "your@domain"
2) Copy the public key to the server: ssh-copy-id deployer@your.ip.address
3) Modify /etc/ssh/sshd_config: change Port (such as 2222), PermitRootLogin no, PasswordAuthentication no, AllowUsers deployer, and then systemctl restart sshd
4) If using non-standard ports, remember to update the firewall rules (see next paragraph).

Firewall configuration (UFW example)

Steps:
1) Enable and set the default policy: ufw default deny incoming; ufw default allow outgoing
2) Allow necessary ports (example): ufw allow 2222/tcp # SSH non-default port; ufw allow 80/tcp; ufw allow 443/tcp
3) Enable UFW: ufw enable; check the status: ufw status verbose
Note: If you use CentOS/RHEL, you can use firewalld or nftables instead. The commands are similar to policies.

Installation and configuration of Fail2Ban to prevent brute force cracking

Steps:
1) Installation: apt -y install fail2ban
2) Create local configuration: cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local
3) Enable sshd in /etc/fail2ban/jail.local and set bantime, findtime, maxretry, for example:

[sshd]
enabled = true
port=2222
filter=sshd
logpath = /var/log/auth.log
maxretry=5
bantime = 3600

4) Restart fail2ban: systemctl restart fail2ban; check: fail2ban-client status sshd

File Integrity and Intrusion Detection (AIDE/Wazuh/OSSEC)

Steps:
1) AIDE simple configuration and initialization: apt -y install aide; aideinit; mv /var/lib/aide/aide.db.new /var/lib/aide/aide.db
2) Check manually or periodically via cron: /usr/bin/aide --check; example crontab: 0 3 * * * /usr/bin/aide --check | mail -s "AIDE report" admin@domain
3) If centralization and SIEM are required: Deploy Wazuh/OSSEC Server on the monitoring server, install the agent (wget installation script, register server), and configure the agent's login key and rules.

Log management and centralization (rsyslog + logrotate / ELK)

Steps:
1) Make sure /etc/rsyslog.conf has remote transmission enabled (if using centralized logging): *.* @@logserver:514
2) logrotate: Check /etc/logrotate.d/ and set rotation and compression of key logs, such as /var/log/nginx/*.log
3) If you need stronger analysis, build ELK or EFK, send logs to Logstash/Fluentd, then to Elasticsearch, and use Kibana to view it.

Web Applications and TLS (Let's Encrypt / Certbot)

Steps:
1) Install certbot: apt -y install certbot python3-certbot-nginx
2) Automatically issue certificates and configure nginx: certbot --nginx -d example.tw
3) Configure automatic renewal: systemctl enable certbot.timer or crontab: 0 0 * * * certbot renew --quiet
4) Configure HSTS, security headers and minimum TLS version in the nginx configuration file, and restart nginx.

Monitoring and Alert (Prometheus + node_exporter + Grafana + Alertmanager)

Steps:
1) Install node_exporter on each VPS: download the binary, set up the systemd service and enable it, the default port is 9100.
2) Install Prometheus on the central monitoring server, edit prometheus.yml, and add targets: - your.ip.address:9100
3) Enable Alertmanager and configure alarm rules in Prometheus (for example, cpu is higher than 90%, triggered for 5m continuously), and configure notification channels (email, Slack, LINE, PagerDuty).
4) Install Grafana and add Prometheus as a data source, and import dashboard (node exporter full) for visualization.

10.

Backup strategy and snapshot (local + cloud)

Steps:
1) File-level backup: Use rsync to perform incremental backup of /etc, /var/www, and database export files. Example: rsync -a --delete /var/www/ user@backup.server:/backups/vps1/
2) Database backup: mysqldump -u root -p dbname > /root/dbname_$(date +%F).sql, and synchronize to the backup server or object storage (S3 compatible).
3) Take advantage of the VPS provider's snapshot capabilities (such as daily/weekly snapshots) and set retention policies and off-site replication to test the recovery process.

11.

Question: How to quickly confirm whether it has been invaded on a local VPS in Taiwan?

Tips:
Check abnormal login: sudo lastb / var/log/auth.log; check the newly added root cron, suspicious service (ss -tulpn), AIDE report; if an unknown binary or persistent startup item is found, isolate it immediately and perform image analysis.

12.

Answer: How to handle and recover if an intrusion is suspected?

Recommended steps:
1) Immediately disconnect the network or restrict external access (firewall rules); 2) Export logs and disk images for forensics; 3) Use a clean environment to restore services (from verified backups or snapshots), 4) Replace keys and passwords and patch vulnerabilities.

13.

Q: How to integrate network latency or passive measurement of Taiwanese VPS into monitoring alarms?

Answer points:
Use blackbox monitoring (blackbox_exporter) or custom scripts to regularly perform HTTP, TCP, and ICMP detection on key ports/URLs, send the results to Prometheus, set a delay threshold (for example, 200ms) as a trigger condition, and alert the relevant person in charge through Alertmanager.

Next article： Technical Tutorial: Configuring Multiple Domain Names And High Availability Solutions On Taiwan DNS Server Cloud Host

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