QUANTARA • QUANTUM-RESISTANT L1
Rollback & Recovery for Quantara Devnet-0
How to safely roll back Quantara node binaries and runtimes on Devnet-0 — and how this rehearsal prepares us for public testnet and mainnet.
Docs • Ops
Rollback & Recovery for Quantara Devnet-0
A practical playbook for controlled rollbacks on Devnet-0 — when to roll back, how to pin known-good versions, and how to verify you’re back on solid ground.
Most incidents resolve by moving forward — deploy a fix, let the chain catch up, and keep going. But sometimes the safest move is to roll back to a known-good version while we investigate.
This runbook explains when rollback is appropriate on Devnet-0, how to coordinate with the Quantara team and other validators, and how to execute a rollback without making the situation worse.
Use this alongside the Incident response, Devnet-0 launch checklist, and Validator runbook docs. Those cover steady-state operations and first-response; this one covers coordinated downgrades.
Never perform a solo rollback when the rest of the network is moving forward. If in doubt, pause, capture evidence, and align with the /status page and validator channels first.
Devnet-0 is a rehearsal environment for the future public testnet and mainnet. Rollback drills here help us design safe playbooks for real economic exposure later.
• Token: QTR / 12 / SS58=73
• RPC: wss://rpc.devnet-0.quantara.xyz
• Explorer: https://explorer.devnet-0.quantara.xyz
Last updated: 2025-11-23 22:00 UTC. Check /status for live incident state, rollback advisories, and version pins.
1 • When to roll back
Deciding whether rollback is the right move
Not every incident needs a rollback. These are the patterns where we’re likely to recommend downgrading to a known-good version.
1.1 — High-risk runtime behavior
- • New runtime correlates with loss of finality.
- • Consensus errors spike right after upgrade.
- • Critical invariants look violated on explorer / RPC.
- • Incident marked Sev-1 on the Status page.
1.2 — Node binary regressions
- • Severe performance regression after node upgrade.
- • Frequent panics or crashes introduced by new binary.
- • Disk or DB issues tied to a specific version.
- • Recovery forward looks riskier than stepping back.
1.3 — What not to roll back
- • Isolated validator misconfiguration or hardware issues.
- • Transient RPC / explorer glitches with healthy chain.
- • Noisy alerts that resolve after tuning thresholds.
- • Cosmetic UI bugs in wallets or dashboards.
When in doubt, assume “stabilize first, then roll back in lockstep”. Devnet-0 is collaborative — use validator / ops channels before changing versions on your own.
2 • Node rollback
Rolling back the Quantara node binary
The most common rollback is downgrading the node binary while keeping the same chain state and runtime.
2.1 — Prerequisites
- • Incident acknowledged on /status with rollback recommendation.
- • Access to the previous known-good binary or container.
- • Checksums / signatures published in release notes.
- • Local notes on your current flags and systemd unit.
2.2 — Binary rollback flow
- 1) Stop the node cleanly via systemd (no forced kills unless directed).
- 2) Download or restore the pinned quantara-node version from the rollback advisory.
- 3) Verify checksum / signature matches release notes.
- 4) Swap the binary (or update container tag) in place.
- 5) Restart with the same flags as before.
- 6) Monitor height, peers, and logs for anomalies.
The Release artifacts doc explains how we publish binaries, checksums, and signatures for Devnet-0.
3 • Runtime & chain state
Runtime rollbacks and state resets
Less common, but sometimes necessary: rewinding or resetting chain state after a problematic runtime or configuration change.
3.1 — Coordinated runtime rollback
- • Only initiated by the Quantara core team.
- • Announced in advance on the Status page and validator channels.
- • Includes explicit target spec version and block height.
- • May require a brief validator pause or sequence of steps.
3.2 — Local state resets (Devnet-0 only)
- • Used when a single node’s DB is unhealthy or corrupt.
- • You may be asked to wipe local state and resync.
- • Follow advisory for purge-chain or snapshot restore commands.
- • Confirm you rejoin the canonical chain post-reset.
3.3 — Full devnet reboots
- • Occasionally we may deliberately restart Devnet-0.
- • You'll receive fresh chain-specs and genesis state.
- • Treat these as full “day-one” drills for your infra.
- • The Launch checklist is your playbook here.
4 • Validator checklist
Validator-specific rollback checklist
When the core team recommends a rollback, this is what we expect individual validators to do and record.
4.1 — Before you roll back
- • Read the /status advisory end-to-end (including exact versions / hashes).
- • Capture current node version and block height.
- • Snapshot key logs and metrics for later analysis.
- • Confirm your team knows the rollback window.
4.2 — After you roll back
- • Verify the running binary version matches advisory.
- • Confirm block height, peers, and finality look healthy.
- • Check your validator is back in the active set.
- • Share a short “all-clear” note with the validator group.
A good rollback report includes: node version → version, block height before/after, timestamps, and any anomalies you noticed. This is gold for future incident reviews.
5 • Record-keeping
Write it down so we don’t repeat it
Rollbacks are only truly successful if they feed into better tooling, better docs, and fewer repeat incidents.
5.1 — Minimum local record
- • Date, time, and severity of the incident.
- • Node and runtime versions before / after rollback.
- • Summary of steps you took and how long it took.
- • Any surprises, pain points, or broken assumptions.
5.2 — Feeding into postmortems
- • We aggregate incident details into a shared Postmortem template.
- • Your notes influence future runbooks and scripts.
- • We may tune alerts and dashboards based on your case.
- • For larger events, we'll share a summarized write-up with validators.
Next steps
Practice rollback now, so mainnet feels boring
Rollback should feel rehearsed, not improvised. Devnet-0 is where we build those muscles together.
Keep this runbook close to the Incident response, Devnet-0 launch checklist and Validator runbook docs. Together, they're the operational core of Quantara's early networks.
If you can perform a clean rollback under mild pressure on Devnet-0 — with notes, hashes, and timelines recorded — mainnet incidents will feel controlled, boring, and professional. That's the goal.