06ead3a19d
Lands the Nomad install + baseline HCL config for the single-node factory dev box. Nothing is wired into `disinto init` yet — S0.4 does that. - lib/init/nomad/install.sh: idempotent apt install pinned to NOMAD_VERSION (default 1.9.5). Adds HashiCorp apt keyring and sources list only if absent; fast-paths when the pinned version is already installed. - lib/init/nomad/systemd-nomad.sh: writes /etc/systemd/system/nomad.service (rewrites only when content differs), creates /etc/nomad.d and /var/lib/nomad, runs `systemctl enable nomad` WITHOUT starting. - nomad/server.hcl: single-node combined server+client role. bootstrap_expect=1, localhost bind, default ports pinned explicitly, UI enabled. No TLS/ACL — factory dev box baseline. - nomad/client.hcl: Docker task driver (allow_privileged=false, volumes enabled) and host_volume pre-wiring for forgejo-data, woodpecker-data, agent-data, project-repos, caddy-data, chat-history, ops-repo under /srv/disinto/*. Verified: `nomad config validate nomad/*.hcl` reports "Configuration is valid!" (with expected TLS/bootstrap warnings for a dev box). Shellcheck clean across the repo. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
130 lines
4.9 KiB
Bash
Executable file
130 lines
4.9 KiB
Bash
Executable file
#!/usr/bin/env bash
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# =============================================================================
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# lib/init/nomad/systemd-nomad.sh — Idempotent systemd unit installer for Nomad
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#
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# Part of the Nomad+Vault migration (S0.2, issue #822). Writes
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# /etc/systemd/system/nomad.service pointing at /etc/nomad.d/ and runs
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# `systemctl enable nomad` WITHOUT starting the service — we don't launch
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# the cluster until S0.4 wires everything together.
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#
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# Idempotency contract:
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# - Existing unit file is NOT rewritten when on-disk content already
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# matches the desired content (avoids spurious `daemon-reload`).
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# - `systemctl enable` on an already-enabled unit is a no-op.
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# - This script is safe to run unconditionally before every factory boot.
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#
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# Preconditions:
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# - nomad binary installed (see lib/init/nomad/install.sh)
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# - /etc/nomad.d/ will hold server.hcl / client.hcl (placed by S0.4)
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#
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# Usage:
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# sudo lib/init/nomad/systemd-nomad.sh
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#
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# Exit codes:
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# 0 success (unit installed + enabled, or already so)
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# 1 precondition failure (not root, no systemctl, no nomad binary)
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# =============================================================================
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set -euo pipefail
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UNIT_PATH="/etc/systemd/system/nomad.service"
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NOMAD_CONFIG_DIR="/etc/nomad.d"
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NOMAD_DATA_DIR="/var/lib/nomad"
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log() { printf '[systemd-nomad] %s\n' "$*"; }
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die() { printf '[systemd-nomad] ERROR: %s\n' "$*" >&2; exit 1; }
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# ── Preconditions ────────────────────────────────────────────────────────────
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if [ "$(id -u)" -ne 0 ]; then
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die "must run as root (needs write access to ${UNIT_PATH})"
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fi
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command -v systemctl >/dev/null 2>&1 \
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|| die "systemctl not found (systemd is required)"
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NOMAD_BIN="$(command -v nomad 2>/dev/null || true)"
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[ -n "$NOMAD_BIN" ] \
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|| die "nomad binary not found — run lib/init/nomad/install.sh first"
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# ── Desired unit content ─────────────────────────────────────────────────────
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# Upstream-recommended baseline (https://developer.hashicorp.com/nomad/docs/install/production/deployment-guide)
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# trimmed for a single-node combined server+client dev box.
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# - Wants=/After= network-online: nomad must have networking up.
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# - User/Group=root: the Docker driver needs root to talk to dockerd.
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# - LimitNOFILE/LimitNPROC=infinity: avoid Nomad's startup warning.
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# - KillSignal=SIGINT: triggers Nomad's graceful shutdown path.
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# - Restart=on-failure with a bounded burst to avoid crash-loops eating the
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# journal when /etc/nomad.d/ is mis-configured.
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read -r -d '' DESIRED_UNIT <<EOF || true
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[Unit]
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Description=Nomad
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Documentation=https://developer.hashicorp.com/nomad/docs
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Wants=network-online.target
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After=network-online.target
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# When Docker is present, ensure dockerd is up before nomad starts — the
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# Docker task driver needs the daemon socket available at startup.
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Wants=docker.service
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After=docker.service
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[Service]
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Type=notify
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User=root
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Group=root
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ExecReload=/bin/kill -HUP \$MAINPID
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ExecStart=${NOMAD_BIN} agent -config=${NOMAD_CONFIG_DIR}
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KillMode=process
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KillSignal=SIGINT
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LimitNOFILE=infinity
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LimitNPROC=infinity
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Restart=on-failure
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RestartSec=2
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StartLimitBurst=3
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StartLimitIntervalSec=10
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TasksMax=infinity
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OOMScoreAdjust=-1000
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[Install]
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WantedBy=multi-user.target
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EOF
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# ── Ensure config + data dirs exist ──────────────────────────────────────────
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# We do not populate /etc/nomad.d/ here (that's S0.4). We do create the
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# directory so `nomad agent -config=/etc/nomad.d` doesn't error if the unit
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# is started before hcl files are dropped in.
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for d in "$NOMAD_CONFIG_DIR" "$NOMAD_DATA_DIR"; do
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if [ ! -d "$d" ]; then
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log "creating ${d}"
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install -d -m 0755 "$d"
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fi
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done
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# ── Install unit file only if content differs ────────────────────────────────
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needs_reload=0
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if [ ! -f "$UNIT_PATH" ] \
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|| ! printf '%s\n' "$DESIRED_UNIT" | cmp -s - "$UNIT_PATH"; then
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log "writing unit → ${UNIT_PATH}"
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tmp="$(mktemp)"
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trap 'rm -f "$tmp"' EXIT
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printf '%s\n' "$DESIRED_UNIT" > "$tmp"
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install -m 0644 -o root -g root "$tmp" "$UNIT_PATH"
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rm -f "$tmp"
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trap - EXIT
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needs_reload=1
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else
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log "unit file already up to date"
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fi
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# ── Reload + enable ──────────────────────────────────────────────────────────
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if [ "$needs_reload" -eq 1 ]; then
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log "systemctl daemon-reload"
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systemctl daemon-reload
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fi
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if systemctl is-enabled --quiet nomad.service 2>/dev/null; then
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log "nomad.service already enabled"
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else
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log "systemctl enable nomad"
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systemctl enable nomad.service >/dev/null
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fi
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log "done — unit installed and enabled (NOT started; S0.4 brings the cluster up)"
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