claude-breakglass: in-cluster warm break-glass UI for the devvm
Stand up the infra for Viktor's break-glass: when the devvm is wedged (cluster healthy), open breakglass.viktorbarzin.me, have Claude SSH in to diagnose/fix, and power-cycle VM 102 via the Proxmox host if needed. App half landed in the claude-agent-service repo. New stack stacks/claude-breakglass/ — own namespace + SA, NO Vault role (ESO syncs only its key, so the pod has zero direct Vault access). Hardened to survive the pressure it exists to fix: priorityClassName tier-0-core, broad node-pressure tolerations, anti-affinity off node1, imagePullPolicy Always. auth="required" ingress so it rides the Authentik resilience proxy and stays reachable via the basic-auth fallback during an auth-stack outage. Runs the shared claude-agent-service image with the breakglass entrypoint. files/breakglass-pve is the PVE forced-command (status|forensics|reset|stop| start|cycle on VM 102, forensics-first). Isolation: the shared claude-agent pod's terraform-state Vault policy is explicitly DENIED secret/claude-breakglass/* (stacks/vault/main.tf) so a prompt-injected agent on that pod can't read the root-on-devvm key. traefik: add a checksum/auth-proxy-htpasswd annotation so the auth-proxy rolls when the emergency basic-auth password rotates (it's a subPath mount that doesn't auto-update) — regenerated this session so Viktor has a known emergency credential, which the auth-stack-outage failure domain requires. Docs: docs/runbooks/breakglass-ui.md (full incident + bootstrap procedure, incl. the per-host from= NAT quirks) and a security.md note recording the two new privileged footholds. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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115
stacks/claude-breakglass/files/breakglass-pve
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115
stacks/claude-breakglass/files/breakglass-pve
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@ -0,0 +1,115 @@
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#!/bin/bash
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# breakglass-pve — forced-command wrapper for the in-cluster claude-breakglass
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# service. Installed in the Proxmox host's /root/.ssh/authorized_keys behind a
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# command="/usr/local/bin/breakglass-pve",restrict,from="<cluster CIDRs>"
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# entry, so the breakglass SSH key can ONLY run the verbs below against VM 102
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# (the devvm) — never a free shell on the hypervisor.
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#
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# The requested verb arrives in $SSH_ORIGINAL_COMMAND. Anything that is not a
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# single bare verb from the allowlist is rejected and logged. Every MUTATING
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# verb captures forensics first, unconditionally, so an erroneous reset never
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# destroys the evidence of why the devvm was wedged.
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#
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# Deployed via scp (see docs/runbooks/breakglass-ui.md); not Terraform-managed
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# (PVE host config is out-of-band, like fan-control / pve-nfs-exports).
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set -euo pipefail
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VMID=102
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LOG=/var/log/breakglass-pve.log
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ts() { date -u +%Y-%m-%dT%H:%M:%SZ; }
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log() { echo "$(ts) [breakglass-pve] $*" >>"$LOG" 2>/dev/null || true; }
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verb="${SSH_ORIGINAL_COMMAND:-}"
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src="${SSH_CLIENT%% *}"
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# Only a single bare verb is accepted — no arguments, no shell metacharacters,
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# no second VMID. This is the whole security boundary of the forced command.
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case "$verb" in
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status|forensics|reset|stop|start|cycle) : ;;
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*)
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log "REJECTED verb='$verb' from=$src"
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echo "breakglass-pve: rejected '$verb'. allowed: status|forensics|reset|stop|start|cycle (VM $VMID only)" >&2
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exit 2
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;;
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esac
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forensics() {
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echo "=== breakglass forensics $(ts) — VM $VMID on $(hostname) ==="
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echo "--- qm status ---"; qm status "$VMID" 2>&1 || true
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echo "--- qm config ---"; qm config "$VMID" 2>&1 || true
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echo "--- qm pending (staged) ---"; qm pending "$VMID" 2>&1 || true
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echo "--- guest agent ping ---"; timeout 5 qm agent "$VMID" ping 2>&1 || echo "(no guest-agent response)"
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echo "--- qmp query-status ---"; echo "info status" | timeout 5 qm monitor "$VMID" 2>&1 || true
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echo "--- qmp block jobs ---"; echo "info block-jobs" | timeout 5 qm monitor "$VMID" 2>&1 || true
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echo "--- host uptime/load ---"; uptime 2>&1 || true
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echo "--- host memory ---"; free -h 2>&1 || true
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echo "--- host io (1s) ---"; ( command -v iostat >/dev/null && iostat -dx 1 2 2>/dev/null | tail -n +4 ) || echo "(iostat unavailable)"
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echo "=== end forensics ==="
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}
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# Wait until VM reaches 'stopped', up to ~timeout seconds. Returns 0 if stopped.
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wait_stopped() {
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local timeout="$1" i
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for ((i=0; i<timeout; i+=2)); do
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qm status "$VMID" 2>/dev/null | grep -q 'status: stopped' && return 0
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sleep 2
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done
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return 1
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}
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log "verb=$verb from=$src"
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case "$verb" in
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status)
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qm status "$VMID"
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;;
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forensics)
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forensics
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;;
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stop|reset|start|cycle)
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# Forensics-first: emit to the caller AND persist on the host.
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F="$(forensics)"
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printf '%s\n' "$F"
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printf '%s\n' "$F" | sed "s/^/$(ts) [forensics] /" >>"$LOG" 2>/dev/null || true
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case "$verb" in
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start)
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qm start "$VMID"
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;;
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reset)
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# Warm reset — reuses the QEMU process. Does NOT apply staged config.
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qm reset "$VMID"
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;;
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stop)
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qm stop "$VMID"
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;;
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cycle)
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# Cold stop->start: spawns a FRESH QEMU process, so staged config
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# (qm pending) is applied — the fix class for the 2026-06-11 I/O stall.
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# If a wedged QEMU ignores a clean stop, escalate to killing the
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# process (matches the 2026-06-11 manual recovery), then start.
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echo "$(ts) cycle: requesting clean stop of VM $VMID"
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qm stop "$VMID" >/dev/null 2>&1 || true
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if wait_stopped 40; then
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echo "$(ts) cycle: clean stop OK"
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else
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log "cycle: clean stop FAILED — killing wedged QEMU for $VMID"
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echo "$(ts) cycle: clean stop failed, killing wedged QEMU"
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pid="$(cat "/var/run/qemu-server/$VMID.pid" 2>/dev/null || true)"
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if [[ -n "$pid" ]]; then
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kill -9 "$pid" 2>/dev/null || true
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else
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pkill -9 -f -- "-id $VMID" 2>/dev/null || true
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fi
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sleep 3
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qm unlock "$VMID" 2>/dev/null || true
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fi
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qm start "$VMID"
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;;
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esac
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log "verb=$verb COMPLETE"
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;;
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esac
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361
stacks/claude-breakglass/main.tf
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361
stacks/claude-breakglass/main.tf
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# claude-breakglass — in-cluster emergency-recovery UI for the devvm.
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#
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# A SEPARATE deployment from claude-agent-service (own namespace, own
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# ServiceAccount, NO Vault K8s-auth role) that runs ONLY the breakglass agent.
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# It shares the claude-agent-service image but overrides the command with the
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# breakglass entrypoint. The untrusted-input agents (recruiter-triage,
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# nextcloud-todos) never share this process or these credentials.
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# See claude-agent-service/docs/adr/0001-breakglass-security-architecture.md.
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#
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# Scope is the WARM case: devvm wedged while the cluster is healthy. The cold,
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# cluster-down path is the break-glass SSH on PVE :52222 (docs/runbooks/breakglass-ssh.md)
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# + the server-lifecycle iDRAC CLI — out of scope here.
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variable "tls_secret_name" {
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type = string
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sensitive = true
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}
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locals {
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namespace = "claude-breakglass"
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# Same image as claude-agent-service — the breakglass code lives in that repo
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# under app/breakglass/, and the deployment below overrides the command.
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image = "forgejo.viktorbarzin.me/viktor/claude-agent-service"
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image_tag = "latest"
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labels = {
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app = "claude-breakglass"
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}
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}
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# --- Namespace ---
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resource "kubernetes_namespace" "breakglass" {
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metadata {
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name = local.namespace
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labels = {
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tier = local.tiers.aux
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}
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}
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lifecycle {
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# KYVERNO_LIFECYCLE_V1: goldilocks/vpa-mode label stamping (harmless if absent)
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ignore_changes = [metadata[0].labels["goldilocks.fairwinds.com/vpa-update-mode"]]
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}
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}
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resource "kubernetes_service_account" "breakglass" {
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metadata {
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name = "claude-breakglass"
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namespace = kubernetes_namespace.breakglass.metadata[0].name
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}
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}
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# --- Secrets (synced by ESO; the pod itself has NO Vault access) ---
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# SSH private key (devvm sudo + PVE forced-command). Mounted as a file the
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# entrypoint loads into ssh-agent. Dedicated path secret/claude-breakglass/* —
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# the claude-agent namespace's terraform-state Vault policy is explicitly
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# DENIED this path (see stacks/vault/main.tf) so the shared, prompt-injectable
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# pod can never read it.
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resource "kubernetes_manifest" "external_secret_ssh" {
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manifest = {
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apiVersion = "external-secrets.io/v1beta1"
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kind = "ExternalSecret"
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metadata = {
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name = "breakglass-ssh"
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namespace = local.namespace
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}
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spec = {
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refreshInterval = "1h"
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secretStoreRef = { name = "vault-kv", kind = "ClusterSecretStore" }
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target = { name = "breakglass-ssh" }
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data = [
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{
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secretKey = "private_key"
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remoteRef = { key = "claude-breakglass/ssh_key", property = "private_key" }
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},
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]
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}
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}
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depends_on = [kubernetes_namespace.breakglass]
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}
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# Env secrets: the Anthropic OAuth token (shared with claude-agent-service —
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# same account) and the app bearer token (in-cluster/CLI fallback caller auth).
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resource "kubernetes_manifest" "external_secret_env" {
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manifest = {
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apiVersion = "external-secrets.io/v1beta1"
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kind = "ExternalSecret"
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metadata = {
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name = "breakglass-env"
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namespace = local.namespace
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}
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spec = {
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refreshInterval = "1h"
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secretStoreRef = { name = "vault-kv", kind = "ClusterSecretStore" }
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target = { name = "breakglass-env" }
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data = [
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{
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secretKey = "CLAUDE_CODE_OAUTH_TOKEN"
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remoteRef = { key = "claude-agent-service", property = "claude_oauth_token" }
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},
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{
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secretKey = "API_BEARER_TOKEN"
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remoteRef = { key = "claude-breakglass", property = "api_bearer_token" }
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},
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]
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}
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}
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depends_on = [kubernetes_namespace.breakglass]
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}
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# --- Deployment ---
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resource "kubernetes_deployment" "breakglass" {
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metadata {
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name = "claude-breakglass"
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namespace = kubernetes_namespace.breakglass.metadata[0].name
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labels = local.labels
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}
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spec {
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replicas = 1
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strategy { type = "Recreate" }
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selector { match_labels = local.labels }
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template {
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metadata { labels = local.labels }
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spec {
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service_account_name = kubernetes_service_account.breakglass.metadata[0].name
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image_pull_secrets {
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name = "registry-credentials"
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}
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# Survive the very pressure event the breakglass exists to fix: high
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# priority (resist eviction), tolerate node pressure, and prefer NOT to
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# land on the contended GPU node1. Pull policy is Always: nodes already
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# cache the OLD claude-agent-service:latest (no breakglass entrypoint),
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# so IfNotPresent would run stale code. A registry-down-on-restart is
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# the cluster-down (cold) case, which this UI doesn't cover anyway.
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priority_class_name = "tier-0-core"
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toleration {
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key = "node.kubernetes.io/memory-pressure"
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operator = "Exists"
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effect = "NoSchedule"
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}
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toleration {
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key = "node.kubernetes.io/disk-pressure"
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operator = "Exists"
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effect = "NoSchedule"
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}
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toleration {
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key = "node.kubernetes.io/not-ready"
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operator = "Exists"
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effect = "NoExecute"
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toleration_seconds = 300
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}
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toleration {
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key = "node.kubernetes.io/unreachable"
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operator = "Exists"
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effect = "NoExecute"
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toleration_seconds = 300
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}
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affinity {
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node_affinity {
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preferred_during_scheduling_ignored_during_execution {
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weight = 100
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preference {
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match_expressions {
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key = "kubernetes.io/hostname"
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operator = "NotIn"
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values = ["k8s-node1"]
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}
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}
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}
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}
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}
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security_context {
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run_as_user = 1000
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run_as_group = 1000
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fs_group = 1000
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}
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# Seed the breakglass agent into the fresh ~/.claude emptyDir and make
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# the session dir writable by uid 1000.
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init_container {
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name = "seed-agent"
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image = "${local.image}:${local.image_tag}"
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command = ["sh", "-c", <<-EOT
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set -e
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mkdir -p /home/agent/.claude/agents /workspace/sessions
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cp /usr/share/agent-seed/breakglass.md /home/agent/.claude/agents/breakglass.md
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chown -R 1000:1000 /home/agent/.claude /workspace
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EOT
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]
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image_pull_policy = "Always"
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security_context {
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run_as_user = 0
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}
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volume_mount {
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name = "claude-home"
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mount_path = "/home/agent/.claude"
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}
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volume_mount {
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name = "sessions"
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mount_path = "/workspace"
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}
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resources {
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requests = { memory = "32Mi" }
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limits = { memory = "64Mi" }
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}
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}
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container {
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name = "claude-breakglass"
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image = "${local.image}:${local.image_tag}"
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image_pull_policy = "Always"
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# Override the image's default CMD (the claude-agent-service uvicorn)
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# with the breakglass entrypoint: ssh-agent bootstrap + ssh aliases,
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# then uvicorn app.breakglass.server:app.
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command = ["/srv/docker-entrypoint-breakglass.sh"]
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port { container_port = 8080 }
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# OAuth token (claude -p) + app bearer token.
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env_from {
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secret_ref { name = "breakglass-env" }
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}
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env {
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name = "BREAKGLASS_KEY_PATH"
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value = "/secrets/breakglass/private_key"
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}
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env {
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name = "BREAKGLASS_SESSIONS_DIR"
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value = "/workspace/sessions"
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}
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env {
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name = "HOME"
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value = "/home/agent"
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}
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liveness_probe {
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http_get {
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path = "/health"
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port = 8080
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}
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initial_delay_seconds = 10
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period_seconds = 30
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}
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readiness_probe {
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http_get {
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path = "/health"
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port = 8080
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}
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initial_delay_seconds = 5
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period_seconds = 10
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}
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volume_mount {
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name = "claude-home"
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mount_path = "/home/agent/.claude"
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}
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volume_mount {
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name = "sessions"
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mount_path = "/workspace"
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}
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volume_mount {
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name = "breakglass-ssh"
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mount_path = "/secrets/breakglass"
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read_only = true
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}
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resources {
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requests = {
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cpu = "200m"
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memory = "512Mi"
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}
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limits = {
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memory = "4Gi"
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}
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}
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}
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volume {
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name = "claude-home"
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empty_dir {}
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}
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volume {
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name = "sessions"
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empty_dir {}
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}
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volume {
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name = "breakglass-ssh"
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secret {
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secret_name = "breakglass-ssh"
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# 0440 + fsGroup 1000 ⇒ readable by uid 1000; the entrypoint copies
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# to a 0600 tmpfs file before ssh-add (which rejects group-readable).
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default_mode = "0440"
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}
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||||
}
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||||
}
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||||
}
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||||
}
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||||
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lifecycle {
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ignore_changes = [spec[0].template[0].spec[0].dns_config] # KYVERNO_LIFECYCLE_V1
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}
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depends_on = [
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kubernetes_manifest.external_secret_ssh,
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kubernetes_manifest.external_secret_env,
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]
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}
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# --- Service ---
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resource "kubernetes_service" "breakglass" {
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metadata {
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name = "claude-breakglass"
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namespace = kubernetes_namespace.breakglass.metadata[0].name
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labels = local.labels
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}
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spec {
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||||
selector = local.labels
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||||
port {
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port = 8080
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||||
target_port = 8080
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||||
}
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type = "ClusterIP"
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||||
}
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||||
}
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|
||||
# --- Ingress: breakglass.viktorbarzin.me ---
|
||||
# auth = "required": Authentik forward-auth via the resilience proxy, which
|
||||
# FALLS BACK to HTTP basic-auth when Authentik is down — the whole point, so the
|
||||
# breakglass is reachable during an auth-stack outage. CrowdSec + rate-limit are
|
||||
# attached by default (not excluded). The app additionally accepts the injected
|
||||
# X-authentik-username header (or a bearer) as its own gate.
|
||||
module "ingress" {
|
||||
source = "../../modules/kubernetes/ingress_factory"
|
||||
name = "breakglass"
|
||||
service_name = kubernetes_service.breakglass.metadata[0].name
|
||||
port = 8080
|
||||
namespace = kubernetes_namespace.breakglass.metadata[0].name
|
||||
tls_secret_name = var.tls_secret_name
|
||||
auth = "required"
|
||||
dns_type = "proxied"
|
||||
|
||||
extra_annotations = {
|
||||
"gethomepage.dev/enabled" = "true"
|
||||
"gethomepage.dev/name" = "devvm breakglass"
|
||||
"gethomepage.dev/description" = "Emergency recovery UI for the devvm"
|
||||
"gethomepage.dev/icon" = "proxmox.png"
|
||||
"gethomepage.dev/group" = "Infrastructure"
|
||||
}
|
||||
}
|
||||
20
stacks/claude-breakglass/terragrunt.hcl
Normal file
20
stacks/claude-breakglass/terragrunt.hcl
Normal file
|
|
@ -0,0 +1,20 @@
|
|||
include "root" {
|
||||
path = find_in_parent_folders()
|
||||
}
|
||||
|
||||
# Platform (Traefik/ingress middlewares), Vault (ESO reads secrets), and
|
||||
# external-secrets (the ClusterSecretStore) must exist first.
|
||||
dependency "platform" {
|
||||
config_path = "../platform"
|
||||
skip_outputs = true
|
||||
}
|
||||
|
||||
dependency "vault" {
|
||||
config_path = "../vault"
|
||||
skip_outputs = true
|
||||
}
|
||||
|
||||
dependency "external-secrets" {
|
||||
config_path = "../external-secrets"
|
||||
skip_outputs = true
|
||||
}
|
||||
|
|
@ -851,6 +851,10 @@ resource "kubernetes_deployment" "auth_proxy" {
|
|||
# nginx only reads its config at startup — roll the pods whenever
|
||||
# the ConfigMap content changes.
|
||||
"checksum/auth-proxy-config" = sha1(kubernetes_config_map.auth_proxy_config.data["default.conf"])
|
||||
# The emergency-fallback htpasswd is a subPath secret mount, which
|
||||
# does NOT auto-update on change — roll the pods when it rotates so a
|
||||
# regenerated emergency password actually takes effect.
|
||||
"checksum/auth-proxy-htpasswd" = sha1(var.auth_fallback_htpasswd)
|
||||
}
|
||||
}
|
||||
spec {
|
||||
|
|
|
|||
|
|
@ -598,6 +598,19 @@ resource "vault_policy" "terraform_state" {
|
|||
path "secret/metadata/vault" {
|
||||
capabilities = ["deny"]
|
||||
}
|
||||
# Explicit deny on the breakglass SSH key (added with the claude-breakglass
|
||||
# stack, 2026-06-12). That key grants root-on-devvm + PVE VM-102 power
|
||||
# verbs; it must NOT be readable by the shared claude-agent pod, whose
|
||||
# agents (recruiter-triage, nextcloud-todos-exec) ingest untrusted input
|
||||
# with Bash. The breakglass pod runs in its own namespace with NO Vault
|
||||
# role and gets the key via ESO only. See
|
||||
# claude-agent-service/docs/adr/0001-breakglass-security-architecture.md.
|
||||
path "secret/data/claude-breakglass/*" {
|
||||
capabilities = ["deny"]
|
||||
}
|
||||
path "secret/metadata/claude-breakglass/*" {
|
||||
capabilities = ["deny"]
|
||||
}
|
||||
EOT
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue