Archived
beatzaplentyandClaude Sonnet 4.6
8d43b7039c
Check NixOS configurations / eval-hosts (push) Successful in 10m39s
Infrastructure changes already applied to pve1:
- vmbr2 internal bridge created (192.168.5.0/24, no physical uplink)
- VM 200 (ha-server-1): net2 added → vmbr2 (ens20)
- VM 201 (ha-server-2): net2 added → vmbr2 (ens20)
- CT 105 (docker): net1 added → vmbr2 (eth1)
- VM 101 (server): net1 added → vmbr2 (ens19) — needs reboot to activate
NixOS config (deploy to ha nodes to complete; docker/server at cutover):
- ha-server-{1,2}/host.nix: ens20 with 192.168.5.{228,227}/24
- docker/host.nix: eth1 with 192.168.5.225/24
- server/host.nix: ens19 with 192.168.5.226/24
- cluster-config.nix: corosync ring1 on LAN IPs as backup heartbeat path
- cluster-config.nix: allow haClientCidr (192.168.5.0/24) in iptables
- ha-server.nix: NFS exports now allow both lanCidr and haClientCidr
- VIP moves from 192.168.2.229 (vmbr0/LAN) to 192.168.5.229 (vmbr2)
- iSCSI portal to be rebound from [::0] to 192.168.5.229 at cutover
variables.nix: haStorageCidr corrected to 192.168.4.224/29; new vars:
vmStorageClientInterface, lxcStorageInterface, haServer{1,2}ClientIp,
dockerStorageIp, serverStorageIp, haClientCidr/PrefixLength; haServerVip
updated to 192.168.5.229.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
257 lines
11 KiB
Bash
Executable File
257 lines
11 KiB
Bash
Executable File
#!/usr/bin/env bash
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# failover.sh — graceful HA cluster failover
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#
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# Detects which node is active and moves all resources to the other node by
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# putting the active node into Pacemaker standby. Waits for the XFS mount to
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# appear on the target before returning.
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#
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# Usage:
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# scripts/ha/failover.sh [--to node1|node2] [--force] [--timeout <s>] [--dry-run]
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#
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# --to node1|node2 target node (default: the node that is NOT currently active)
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# --force skip the interactive confirmation prompt
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# --timeout <s> seconds to wait for resources to move (default: 120)
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# --dry-run show what would be done without changing anything
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set -euo pipefail
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# ── Configuration ─────────────────────────────────────────────────────────
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NODE1="${NODE1:-ha-server-1}"
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NODE2="${NODE2:-ha-server-2}"
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NODE1_IP="${NODE1_IP:-192.168.2.228}"
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NODE2_IP="${NODE2_IP:-192.168.2.227}"
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VIP="${VIP:-192.168.5.229}"
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XFS_MOUNT="${XFS_MOUNT:-/srv/ha-data}"
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HA_USER="${HA_USER:-nixos}"
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# ──────────────────────────────────────────────────────────────────────────
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n1() { ssh -i ~/.ssh/id_ed25519 -o StrictHostKeyChecking=no -o ConnectTimeout=5 "${HA_USER}@${NODE1_IP}" sudo "$@" 2>/dev/null; }
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n2() { ssh -i ~/.ssh/id_ed25519 -o StrictHostKeyChecking=no -o ConnectTimeout=5 "${HA_USER}@${NODE2_IP}" sudo "$@" 2>/dev/null; }
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# ── Argument parsing ───────────────────────────────────────────────────────
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TARGET_NODE=""
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FORCE=false
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DRY_RUN=false
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TIMEOUT=120
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while [[ $# -gt 0 ]]; do
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case "$1" in
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--to)
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shift
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case "${1:-}" in
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node1|ha-server-1) TARGET_NODE="$NODE1" ;;
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node2|ha-server-2) TARGET_NODE="$NODE2" ;;
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*) echo "ERROR: --to must be node1, node2, ha-server-1, or ha-server-2"; exit 1 ;;
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esac
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;;
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--force) FORCE=true ;;
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--dry-run) DRY_RUN=true ;;
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--timeout) shift; TIMEOUT="${1:?--timeout requires a value}" ;;
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*) echo "Unknown argument: $1"; echo "Usage: $0 [--to node1|node2] [--force] [--timeout <s>] [--dry-run]"; exit 1 ;;
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esac
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shift
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done
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DRY_PREFIX=""
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$DRY_RUN && DRY_PREFIX="[dry-run] "
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echo "════════════════════════════════════════════════════"
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echo " HA Cluster Failover — $(date '+%Y-%m-%d %H:%M:%S')"
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$DRY_RUN && echo " MODE: dry-run — no changes will be made"
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echo "════════════════════════════════════════════════════"
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# ── Detect active node ─────────────────────────────────────────────────────
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echo ""
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echo "Detecting active node..."
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CRM_OUT=""
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if ssh -i ~/.ssh/id_ed25519 -o StrictHostKeyChecking=no -o ConnectTimeout=5 "${HA_USER}@${NODE1_IP}" true 2>/dev/null; then
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CRM_OUT=$(n1 "crm_mon -1" 2>/dev/null || true)
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fi
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if [[ -z "$CRM_OUT" ]]; then
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if ssh -i ~/.ssh/id_ed25519 -o StrictHostKeyChecking=no -o ConnectTimeout=5 "${HA_USER}@${NODE2_IP}" true 2>/dev/null; then
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CRM_OUT=$(n2 "crm_mon -1" 2>/dev/null || true)
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fi
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fi
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# crm_mon 2.x formats Promoted lines as " * Promoted: [ node ]" — the * bullet
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# means ^\s*(Promoted|Masters): never matches; filter Unpromoted first instead.
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ACTIVE_NODE=$(echo "$CRM_OUT" | grep -v 'Unpromoted\|Unmanaged' | \
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grep -E '(Promoted|Masters):' | \
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grep -oE '\b(ha-server-[0-9]+)\b' | head -1 || true)
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if [[ -z "$ACTIVE_NODE" ]]; then
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echo ""
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echo "ERROR: could not determine active node from crm_mon."
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echo " Is Pacemaker still settling? Try running scripts/ha/health.sh first."
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echo " If Pacemaker is down on both nodes, manual recovery is required."
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exit 1
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fi
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if [[ "$ACTIVE_NODE" == "$NODE1" ]]; then
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ACTIVE_IP="$NODE1_IP"
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STANDBY_NODE="$NODE2"
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STANDBY_IP="$NODE2_IP"
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na() { n1 "$@"; }
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ns() { n2 "$@"; }
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else
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ACTIVE_IP="$NODE2_IP"
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STANDBY_NODE="$NODE1"
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STANDBY_IP="$NODE1_IP"
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na() { n2 "$@"; }
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ns() { n1 "$@"; }
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fi
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echo " Active: $ACTIVE_NODE ($ACTIVE_IP)"
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echo " Standby: $STANDBY_NODE ($STANDBY_IP)"
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# ── Validate target ────────────────────────────────────────────────────────
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if [[ -n "$TARGET_NODE" ]]; then
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if [[ "$TARGET_NODE" == "$ACTIVE_NODE" ]]; then
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echo ""
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echo "ERROR: $TARGET_NODE is already the active node — nothing to do."
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exit 1
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fi
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echo " Target: $TARGET_NODE (as requested)"
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else
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echo " Target: $STANDBY_NODE (auto — the other node)"
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fi
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# ── Pre-checks ─────────────────────────────────────────────────────────────
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echo ""
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echo "Pre-checks..."
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DRBD_DSTATE=$(na "drbdadm dstate ha-data 2>/dev/null" 2>/dev/null || echo "unknown")
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if ! echo "$DRBD_DSTATE" | grep -q "UpToDate/UpToDate"; then
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echo ""
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echo " WARNING: DRBD dstate is '$DRBD_DSTATE' (not UpToDate/UpToDate)."
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echo " Failing over with a partially-synced disk risks split-brain."
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if ! $FORCE; then
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echo " Use --force to proceed anyway (not recommended)."
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exit 1
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fi
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echo " --force specified — proceeding despite non-ideal DRBD state."
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else
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echo " DRBD dstate: $DRBD_DSTATE — OK"
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fi
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QUORUM_OK=$(na "corosync-quorumtool -s 2>/dev/null | grep -c 'Quorate:.*Yes'" 2>/dev/null || echo "0")
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if [[ "$QUORUM_OK" -lt 1 ]]; then
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echo " ERROR: cluster does not have quorum — failover would be unsafe."
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exit 1
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fi
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echo " Quorum: OK"
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# ── Confirm ────────────────────────────────────────────────────────────────
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if ! $FORCE && ! $DRY_RUN; then
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echo ""
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echo " This will move all resources from $ACTIVE_NODE → $STANDBY_NODE."
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echo " VIP and services will be unreachable for ~10–30 seconds."
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printf " Proceed? [y/N] "
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read -r ANSWER
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[[ "${ANSWER,,}" == "y" || "${ANSWER,,}" == "yes" ]] || { echo "Aborted."; exit 0; }
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fi
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# ── Capture active node's crm_node name ───────────────────────────────────
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# crm_node -n returns the node name as registered in Pacemaker (may differ
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# from hostname if Pacemaker was configured with explicit node names).
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ACTIVE_CRMD_NAME=$(na "crm_node -n 2>/dev/null" 2>/dev/null || echo "$ACTIVE_NODE")
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# ── Perform failover ───────────────────────────────────────────────────────
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echo ""
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echo "${DRY_PREFIX}Putting $ACTIVE_NODE into standby (resources will migrate to $STANDBY_NODE)..."
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if ! $DRY_RUN; then
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na "crm_standby -N '${ACTIVE_CRMD_NAME}' -v on" 2>/dev/null || true
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fi
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# ── Wait for resources to move ─────────────────────────────────────────────
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echo "${DRY_PREFIX}Waiting up to ${TIMEOUT}s for XFS to mount on $STANDBY_NODE..."
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MOVED=false
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SPIN_CHARS=('|' '/' '-' '\')
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SPIN_I=0
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if $DRY_RUN; then
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echo " [dry-run] would wait for mountpoint $XFS_MOUNT on $STANDBY_NODE"
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MOVED=true
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else
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for i in $(seq 1 "$TIMEOUT"); do
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if ns "mountpoint -q '${XFS_MOUNT}' 2>/dev/null" 2>/dev/null; then
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printf "\r%-80s\r" ""
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echo " Resources moved in ${i}s"
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MOVED=true
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break
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fi
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SPIN_I=$(( SPIN_I + 1 ))
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SC="${SPIN_CHARS[$((SPIN_I % 4))]}"
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printf "\r [%s] waiting... (%ds) " "$SC" "$i"
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sleep 1
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done
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fi
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if ! $MOVED; then
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echo ""
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echo "ERROR: XFS did not mount on $STANDBY_NODE within ${TIMEOUT}s."
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echo ""
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echo " Current resource state:"
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na "crm_mon -1 2>/dev/null" 2>/dev/null | grep -E 'Started|Stopped|Promoted|Unpromoted|FAILED' | sed 's/^/ /' || true
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echo ""
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echo " Clearing standby to restore $ACTIVE_NODE (undo the failover attempt)..."
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na "crm_standby -N '${ACTIVE_CRMD_NAME}' -v off" 2>/dev/null || true
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na "crm_resource --cleanup" 2>/dev/null || true
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exit 1
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fi
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# ── Clear failure history ──────────────────────────────────────────────────
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echo "${DRY_PREFIX}Clearing Pacemaker failure history..."
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if ! $DRY_RUN; then
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ns "crm_resource --cleanup 2>/dev/null" 2>/dev/null || true
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fi
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# ── Re-enable original active node as standby ─────────────────────────────
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echo "${DRY_PREFIX}Re-enabling $ACTIVE_NODE (now standby — will not claim resources)..."
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if ! $DRY_RUN; then
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na "crm_standby -N '${ACTIVE_CRMD_NAME}' -v off" 2>/dev/null || true
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fi
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# ── Wait briefly for DRBD resync to begin ─────────────────────────────────
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if ! $DRY_RUN; then
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sleep 5
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fi
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# ── Final state ────────────────────────────────────────────────────────────
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echo ""
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echo "Failover complete. Final state:"
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echo ""
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CRM_OUT_AFTER=""
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if ! $DRY_RUN; then
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CRM_OUT_AFTER=$(ns "crm_mon -1" 2>/dev/null || na "crm_mon -1" 2>/dev/null || true)
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else
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CRM_OUT_AFTER="$CRM_OUT"
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fi
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NEW_ACTIVE=$(echo "$CRM_OUT_AFTER" | grep -v 'Unpromoted\|Unmanaged' | \
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grep -E '(Promoted|Masters):' | \
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grep -oE '\b(ha-server-[0-9]+)\b' | head -1 || true)
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if [[ -n "$NEW_ACTIVE" ]]; then
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if [[ "$NEW_ACTIVE" == "$ACTIVE_NODE" ]]; then
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echo " WARNING: $ACTIVE_NODE is still showing as active in crm_mon."
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echo " Pacemaker may still be settling — check again in a few seconds."
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else
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echo " Active: $NEW_ACTIVE"
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echo " Standby: $ACTIVE_NODE"
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fi
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fi
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echo ""
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RESOURCES_AFTER=$(echo "$CRM_OUT_AFTER" | awk '/Full List of Resources/,0' | tail -n +2 || true)
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[[ -z "$RESOURCES_AFTER" ]] && RESOURCES_AFTER=$(echo "$CRM_OUT_AFTER" | \
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grep -E 'Started|Stopped|Promoted|Unpromoted|FAILED|Master|Slave' || true)
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[[ -n "$RESOURCES_AFTER" ]] && echo "$RESOURCES_AFTER" | sed 's/^/ /'
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echo ""
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echo " (DRBD resync of $ACTIVE_NODE may take a moment; monitor with:"
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echo " ssh nixos@${ACTIVE_IP} 'sudo watch -n3 cat /proc/drbd')"
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echo ""
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echo "════════════════════════════════════════════════════"
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