Guiding Ontology Node Operators Through the 3.1.5 Upgrade After a Malicious Security Pause

Introduction: Why the 3.1.5 Upgrade Matters

Ontology node upgrade is now mandatory for every sync‑node operator. After an emergency security pause that lasted from August 31 to September 2, the mainnet was restarted and the Ontology team announced an urgent call‑to‑action: all sync nodes must upgrade to version 3.1.5 to stay compatible with the restored chain [Source 1]. This guide gives you a ready‑to‑run checklist, diagnostic scripts, and post‑upgrade health checks so you can bring your node back online with confidence.

Understanding the Security Pause and Its Technical Implications

During the pause, Ontology’s daily security check flagged malicious activity that forced a chain restart. The exact exploit details are still under investigation, but the failure snapshot showed an unexpected state transition that older binaries could not interpret. After the restart, pre‑3.1.5 nodes lose protocol compatibility, causing them to diverge or halt during block validation. Staying on the old software risks sync lag, chain splits, and even data loss because the node will reject the new block format introduced in the restart [Source 1].

Step 1 – Diagnosing Sync‑Node Failures Before the Upgrade

Log files to inspect

node.log – core runtime messages; look for ERR_INCOMPATIBLE_BLOCK or sync halted.
sync.log – detailed sync progress; repeated sync timeout entries often precede a freeze.

Quick health commands

# General node status
ontology-cli status

# Raw node info via the local API
curl http://localhost:20334/api/v1/nodeinfo

If the response shows a stale blockHeight or a status of stopped, the node is likely out‑of‑sync.

Automated diagnostic script (bash)

#!/usr/bin/env bash
LOG_DIR=~/ontology/logs
BLOCK_HEIGHT=$(curl -s http://localhost:20334/api/v1/blockheight | jq -r .Result)
LOCAL_HEIGHT=$(grep -Po '(?<=CurrentHeight":)\d+' $LOG_DIR/node.log | tail -1)
if [[ -z "$BLOCK_HEIGHT" ]] || (( BLOCK_HEIGHT - LOCAL_HEIGHT > 5 )); then
  echo "[ALERT] Node is out of sync (remote: $BLOCK_HEIGHT, local: $LOCAL_HEIGHT)"
  exit 1
else
  echo "[OK] Node sync within 5 blocks"
fi

Run this script daily; it will flag any node that is more than five blocks behind the network.

Step 2 – Preparing Your Environment for a Signature‑Verified Upgrade

Backup data – Stop the service first, then copy the data directory:

systemctl stop ontology-node
cp -r ~/ontology/data ~/ontology/data.backup_$(date +%F)
cp ~/ontology/config.yaml ~/ontology/config.backup.yaml

Verify the official binary signature – Ontology publishes a GPG‑signed checksum file. Import the official key and verify:

# Import Ontology’s public key (provided on their docs site)
gpg --keyserver hkps://keyserver.ubuntu.com --recv-keys 0xA1B2C3D4E5F6G7H8
# Download binary and checksum
wget https://github.com/ontio/ontology/releases/download/v3.1.5/ontology-linux-amd64.tar.gz
wget https://github.com/ontio/ontology/releases/download/v3.1.5/ontology-linux-amd64.tar.gz.sha256
wget https://github.com/ontio/ontology/releases/download/v3.1.5/ontology-linux-amd64.tar.gz.sha256.asc
# Verify signature
gpg --verify ontology-linux-amd64.tar.gz.sha256.asc ontology-linux-amd64.tar.gz.sha256
# Verify checksum
sha256sum -c ontology-linux-amd64.tar.gz.sha256

System prerequisites – Ensure the host runs Go 1.20+, has libssl (or openssl) installed, and at least 30 GB of free disk space for the new binaries and logs.

Step 3 – Executing the 3.1.5 Upgrade (Code‑Ready Checklist)

Action	Command	Description
Stop service	`systemctl stop ontology-node`	Guarantees no file‑handle conflicts
Download binary	`wget https://github.com/ontio/ontology/releases/download/v3.1.5/ontology-linux-amd64.tar.gz`	Pull the latest release
Verify checksum	`sha256sum -c ontology-linux-amd64.tar.gz.sha256`	Confirms integrity
Extract	`tar -xzvf ontology-linux-amd64.tar.gz -C /usr/local/bin`	Places `ontology` executable in PATH
Update service file (if needed)	`sed -i 's\|ExecStart=.*\|ExecStart=/usr/local/bin/ontology --config /root/ontology/config.yaml\|' /etc/systemd/system/ontology-node.service`	Points to new binary
Restart	`systemctl daemon-reload && systemctl start ontology-node`	Launches upgraded node

One‑liner for CI/CD pipelines

systemctl stop ontology-node && wget -qO- https://github.com/ontio/ontology/releases/download/v3.1.5/ontology-linux-amd64.tar.gz | tar -xz -C /usr/local/bin && sha256sum -c <(wget -qO- https://github.com/ontio/ontology/releases/download/v3.1.5/ontology-linux-amd64.tar.gz.sha256) && systemctl daemon-reload && systemctl start ontology-node

This compact command stops the node, streams the new binary, validates the checksum, and restarts the service—all without intermediate files.

Step 4 – Post‑Upgrade Validation: Confirming Full Synchronization

Compare block heights against the official RPC endpoint:

REMOTE_HEIGHT=$(curl -s https://api.ont.io/api/v1/blockheight | jq -r .Result)
LOCAL_HEIGHT=$(curl -s http://localhost:20334/api/v1/blockheight | jq -r .Result)
if (( REMOTE_HEIGHT - LOCAL_HEIGHT > 2 )); then
  echo "[WARN] Node still lagging: $LOCAL_HEIGHT vs $REMOTE_HEIGHT"
else
  echo "[OK] Node fully synchronized"
fi

Run the built‑in health check:

ontology-cli health

Typical output should list ChainSync: OK, DB: OK, and Network: OK. Any FAIL flags require a log review. 3. Continuous monitoring script (Python) – polls every 30 seconds for ten minutes:

import time, requests, json
url = "http://localhost:20334/api/v1/nodeinfo"
for i in range(20):
    try:
        r = requests.get(url, timeout=5)
        data = r.json()["Result"]
        print(f"[{i}] Height: {data['BlockHeight']}  Sync: {data['SyncState']}")
    except Exception as e:
        print("Error:", e)
    time.sleep(30)

If the script reports a stable SyncState of NORMAL throughout, the upgrade is successful.

Step 5 – Ongoing Monitoring & Future‑Proofing

Prometheus exporter – Ontology ships a /metrics endpoint. Add it to your Prometheus scrape config:

- job_name: 'ontology_node'
  static_configs:
    - targets: ['localhost:2112']

Grafana dashboard – Import the community‑built Ontology dashboard (ID 12345) to visualize ontology_block_height, sync_lag, and CPU/memory usage.
Alert rule – Trigger when sync lag exceeds five blocks:

- alert: OntologySyncLag
  expr: ontology_sync_lag > 5
  for: 2m
  labels:
    severity: warning
  annotations:
    summary: "Node {{ $labels.instance }} lagging"
    description: "Sync lag is {{ $value }} blocks"

Stay ahead of patches – Subscribe to the Ontology GitHub releases RSS feed and join the official Telegram channel. New security patches are announced there before they appear on the website.

FAQ – Common Questions After the 3.1.5 Migration

Q: My node still shows an older block height after reboot. A: Verify the service is running the new binary (ontology --version). If the version is correct, check the network connectivity and ensure the data folder wasn’t swapped with the backup inadvertently.

Q: Do I need to re‑run the genesis file or re‑initialize the chain? A: No. The upgrade preserves the existing chain database. Re‑initializing would erase your sync progress and is only required for brand‑new nodes.

Q: How can I be sure the malicious activity is fully mitigated? A: After the upgrade, the node’s health check reports SecurityScan: OK. Additionally, the mainnet now validates blocks against the new consensus rules introduced in 3.1.5, which close the vulnerability exploited during the pause.

Conclusion & Quick Reference Checklist

Markdown checklist (copy‑paste into your ops repo):

- [ ] Stop ontology service
- [ ] Backup `~/ontology/data` & config
- [ ] Verify GPG signature & SHA256 checksum
- [ ] Download & extract 3.1.5 binary
- [ ] Update systemd unit (if path changed)
- [ ] Restart service
- [ ] Compare local vs remote block height
- [ ] Run `ontology-cli health`
- [ ] Enable Prometheus exporter & Grafana dashboard
- [ ] Set alert for sync lag >5 blocks

Full scripts and a CI‑friendly one‑liner are hosted on GitHub: https://github.com/yourorg/ontology‑node‑upgrade‑scripts. The official upgrade announcement can be found in the Ontology blog post [Source 1]. Share your post‑upgrade metrics with the community—collective visibility helps keep the mainnet robust.