ops: apply approved host-operator remediations on railiance01
Record operator approval and implement P1–P4: 4G swapfile, journald vacuum, apt upgrade, and UFW lockdown of k3s API/flannel world-open rules. k3s node Ready post-change; residual risk is still tight RAM.
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# Outstanding risks — eng-coulomb-railiance01-ho-001
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Populated during operate; finalise at ramp-down (RD-03).
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| Risk | Severity | Mitigation / owner | Status |
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|------|----------|--------------------|--------|
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| RAM undersized (3.8G, no swap) for k3s+platform density | Critical | Human capacity decision (RAM and/or swap); reduce concurrent load | open |
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| k3s API ServiceUnavailable under pressure | Critical | Stabilize memory; re-check API; avoid heavy kubectl while degraded | open |
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| Load average ≫ 2 cores | High | Same as capacity; schedule non-urgent work off-host | open |
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| journald ~4.1G | Medium | Approved journal vacuum | open |
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| Pending security package updates | Medium | Approved OS security pass | open |
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| UFW allows 6443/8472 from Anywhere | Medium | Policy review + possible firewall_change | open |
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| Reverse-forward port 18765 collisions | Low–Medium | Bridge/tunnel cleanup | open |
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| RAM still 3.8G; swap heavily used (~1.9G/4G) | High | Provider RAM upgrade | open |
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| Load still elevated (~6 on 2 cores) | Medium | Reduce concurrent workloads; capacity | open |
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| Stale user sessions after apt upgrade | Low | Re-login SSH | open |
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| UFW 6443 allowlist may miss new admin IPs | Medium | Add `ufw allow from <ip> to any port 6443 proto tcp` | open |
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| 8472 closed externally | Low | Re-open if multi-node flannel peers appear | accepted (single-node) |
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| fwupd.service failed restart during upgrade | Low | Investigate if firmware tooling needed | open |
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