timar

Agentless fleet care for homelabs: wake machines that are asleep, update them, read their logs, and put them back the way they were found.

Nothing is installed on the machines you manage — timar needs SSH, and Wake-on-LAN for the ones that sleep. It is one container with one data volume, so moving it is copying a directory. There is a one-page tour at timar.tools.

Three states, not two. Asleep (grey) is a machine that is meant to be off, and it is not painted like a fault — a status page that shows both in red teaches you to ignore red.

Status: early. Wake, update, log sweep, containers, the scheduler and key enrolment work and are tested. Read CHANGELOG.md before upgrading.

Run it

curl -O https://raw.githubusercontent.com/orkun-soylu/timar/main/docker-compose.yml
docker compose up -d

Open http://<host>:8080 and create the operator account — nothing else answers until you do.

The image is built for amd64 and arm64; a Raspberry Pi is a first-class host. :latest follows the newest release; pin a version (ghcr.io/orkun-soylu/timar:0.2.39) to choose when you move.

Add, edit and remove servers and containers from their pages. A server's form has three sections — Server info, Update, SSH access — each with a ? that explains it; the SSH section is also where the server is enrolled: timar installs its own key with your password once (never stored) and proves the key works on its own. An address may carry an SSH port (10.0.0.5:2222), and a web interface turns the server's name into a link while it is up — a panel, or a program on your own machine through a scheme you allow (below). It all lands in config.yaml in the timar-data volume, which you can also edit by hand — see config.example.yaml.

A VM has no wake address of its own, so it names the hypervisor that starts it and inherits on-demand from it — otherwise every night it spends off would be reported as an outage.

⚠️ Do not expose this to the internet. timar holds an SSH key that reaches every machine it manages and can grant itself sudo on them. Keep it on a private network, or behind a reverse proxy you control.

Bridge networks and other subnets

The compose file uses network_mode: host because Wake-on-LAN does not work from a bridge network: the send succeeds, no error, and the packet never reaches the LAN (measured with tcpdump: bridge 0 packets, host 1).

If you do not need to wake machines, a bridge is fine — replace network_mode: host with:

    ports:
      - "8080:8080"

To wake from a bridge — or to wake a machine in a different subnet, which host networking cannot do either — give that server a wake relay (below).

Advanced wake settings

Two settings are written in config.yaml by hand; the server form does not show them as fields. It says when one is set, and saving the form keeps it untouched. Most installations need neither: with host networking, one LAN and every machine on it, the defaults wake everything.

Key	Default	Set it when
wol_relay	none — timar sends the packet itself	the machine is in another subnet (a second site, an office VLAN), or timar runs on a bridge network
wol_broadcast	255.255.255.255	timar's host has several networks and the packet leaves through the wrong one

wol_relay names another server in the same file. A magic packet is a broadcast, and a broadcast stops at the router, so the packet has to start inside the target's own subnet: timar connects to the relay over SSH and sends it from there. The relay must be always on, already enrolled, and have python3 or wakeonlan. If the relay is renamed in the form, the reference follows. If it is removed, the wake fails and says the relay "is not configured"; it doesn't fail silently.

wol_broadcast is the address the packet is sent to. 255.255.255.255 leaves through the interface of the default route, which is right on a single-LAN host. On a host with several networks, give the target segment's own broadcast address (10.0.0.255 for a 10.0.0.0/24) so the kernel picks the interface that reaches it. With a relay it is the address the relay sends to.

servers:
  - name: office-nas
    host: 10.1.0.20
    user: deploy
    wol_mac: "aa:bb:cc:dd:ee:20"
    wol_relay: office-router      # an always-on, enrolled host in 10.1.0.0/24
    wol_broadcast: 10.1.0.255     # optional; the relay's own segment

Edit the file inside the volume — docker exec -it timar vi /data/config.yaml, or copy it out and back with docker cp. It is read on every request: no restart.

Devices without SSH

An access point or a NAS appliance belongs on the servers page too, with its link, even though timar cannot log in to it. Tick No SSH — only watch it and link to it in its form, or write ssh: false in config.yaml:

servers:
  - name: access-point
    host: 10.0.0.2
    platform: linux          # required by the form, otherwise unused
    ssh: false
    logo: tplink             # synology, qnap, truenas, unraid, tplink, ubiquiti, mikrotik, …
    web_url: "https://10.0.0.2"

Such a device:

• is probed on its web port (443, then 80) instead of SSH, or on the port its address carries;
• is drawn with the logo its entry names, since nothing can be read from it, and its System cell names that logo;
• is never enrolled, swept, updated or shut down, and is left out of the job lists and reports. A Wake-on-LAN MAC still works.

Links to programs

A server's web interface is normally a panel: https:// (added if you leave it out) or http://. It can also be a link that opens a program on the machine you are looking from: a handler registered for its own scheme, like claude://open for a terminal. timar draws that link only if its scheme is listed in config.yaml:

link_schemes: [claude, pi]

servers:
  - name: workstation
    host: 10.0.0.8
    user: deploy
    web_url: "claude://open"   # the form accepts it once claude is in link_schemes

The list lives only in the file, and the form cannot change it. Allowing a scheme decides what this page may launch, and the page sits in front of a key that reaches every machine. Anything not listed is refused, and the error names link_schemes. javascript, data, vbscript, file and blob are refused even when listed: they run inside the page, not in another program. A link to a program opens in place, with no new tab, because a new tab would be left behind empty. The value is checked again every time the page is drawn. A hand-edited javascript: therefore never reaches it, and removing a scheme from the list removes its links. Container links stay http(s) only, because a container's address is also its health check.

Why

Homelab machines are mostly off. Tools built for always-on fleets assume an agent that phones home — the one thing a sleeping machine cannot do. timar inverts it: waking the host is the first step of the job, and shutting it back down is the last.

What it does

• Update — wake if asleep, run the platform's update command, update the machine's compose projects, shut down again if it started off. Proxmox hosts bring their guests along, in order. The machine timar itself runs on goes last. Its package update is handed to that machine's systemd, so upgrading Docker under timar no longer cuts the run short.
• Power — wake an on-demand machine or shut it down from its row. Guests go through their hypervisor with qm. Any running machine can be shut down; one timar cannot wake again — always-on, or switched on by hand — gets a confirmation that says it will stay off.
• Log sweep — system log errors, disk pressure, stopped containers, and scheduled jobs that did not run.
• Its logo, in its state's colour — each server's name has its OS's logo before it, or its appliance's (Proxmox, OctoPrint), green when up, grey asleep, red down. Each container project has its application's logo the same way. The OS and its version ("Debian 13", "Proxmox VE 9.2") are read on connections timar makes anyway (enrolment, the sweep, the update), never by the status probe.
• The fleet at a glance — a summary above the servers table counts each state ("13 up · 3 asleep · 0 down"), and each count filters the table. Sorted by name, a hypervisor's VMs sit nested under it.
• Platform-aware — Linux/systemd, OpenWrt and Proxmox VE each get commands that exist on them. A check that cannot run says so instead of reporting all-clear.
• Report archive — every finished run is kept under /reports, so a disk creeping upward or an update failing every week shows as a series. Telegram delivery is a copy, not the only one. Each run's outcome is its counts as coloured chips (red failed, yellow findings, green updated), and times read relatively ("2 hours ago", "in 8 hours") with the exact minute on hover.
• Containers — Docker Compose projects on those machines: their state, start / stop / restart, and an update with every run (below).

The written assessment sits above the findings it came from, never instead of them. A machine that was asleep is not checked, not clean — a sweep does not wake the fleet, and calling an unchecked host healthy is the one thing a status page must not do.

Reports and the two jobs

The reports page holds the two jobs at the top and every run they finished below.

• run starts a job now; while it runs the button becomes stop, which asks first. The job stops after the step it is on — a command running on a host finishes, a machine woken for the run is still shut down — and its report says what was not reached.
• The pencil opens the job's settings: its schedule (daily, weekly, or every N hours) and, for the sweep, the log window and the disk threshold — and which servers it runs on.

A job runs on every server that is enrolled — timar has logged in to it with its key — and not left out of that job. − leaves a server out after asking, + takes it back; a server that is not enrolled links to its card's SSH section. The others are not woken and not connected to, and the report names them as skipped. A VM is updated through its hypervisor, so leaving the hypervisor out leaves its VMs out too. The lists are job_exclude in config.yaml.

A report opens over the list, so comparing runs does not lose your place:

Containers

The containers page lists Docker Compose projects — one row per project directory, however many containers it starts. Add one with +: a name, the server it runs on, and the absolute path of the directory holding its docker-compose.yml. Or let Find on a host, at the top of that form, ask a server for its compose projects (docker compose ls): those not registered yet are listed with their name, directory and a web address guessed from a Traefik Host() rule — tick, adjust, Add selected. All ticked rows go in, or, if any is wrong, none.

• State comes from one docker ps -a per host over SSH, grouped by the compose working-directory label, read in the background every minute — the page shows the last answer and never waits for it. Green is running; yellow is running but a container's healthcheck fails, a container exited with an error (a one-shot that exited 0 does not count), or the optional health check address does not answer below HTTP 500; grey is stopped and marked on-demand, or the host is not up and was not asked; red should run and does not.
• The light is the application's logo in the state's colour. It is read off names timar already has: the project's own name, then each image and its owner, so vaultwarden/server shows Vaultwarden. Project names are often not the application's (photos, vault), which is why the images decide. A bundled database or proxy loses to the application it serves, and anything not recognised, such as a local build, shows Docker's whale. The last logo seen is kept, so a project on a host that is asleep looks the same as when it ran.
• Start, stop, restart run docker compose up -d, stop and restart in the project's directory. Start uses up -d because after a down the containers no longer exist.
• timar's own project gets no stop or restart button: it finds its container id in /proc/self/mountinfo and refuses to take the page down with it.
• The account needs to be in the docker group or have passwordless sudo; timar tries plain docker first and falls back to sudo -n docker.
• Removing an entry only forgets it. Nothing on the host is touched.

Updates. The update run updates each registered project right after its host, over the same connection — one line per project in the report:

update	What runs, in the project's directory
pull (default)	docker compose pull --ignore-buildable, then docker compose up -d — only if the project was running
custom	your update_cmd, for example docker compose up -d --build
skip	nothing

There is never a down first: a failed pull leaves the project as it was, where down + failed pull would leave it removed. up -d recreates only the containers whose image changed. A project that was not running is pulled and left stopped. Services with a build: section are not pulled (rebuild them by hand or with a custom command). Unused images are pruned once per host afterwards. timar's own project is always skipped — recreating itself would end the run halfway.

Log sweep. Stopped containers of a project marked on-demand are not reported; everything else that exited still is, registered or not.

Hardware

The hardware page keeps what the fleet table cannot show — boards, cards, disks, which MAC moved to which box — as Markdown documents, one tab each, the first one open. + uploads a .md file or starts an empty one; the pencil switches a document to a text box.

• The files are the store: /data/hardware/<name>.md, nothing else. Bind-mount that directory (- ./hardware:/data/hardware beside the volume) to keep it in git or edit it with your own tools; the container user (uid 1000) needs to be able to write it.
• A save is refused if the file changed since the editor opened it, so an edit made elsewhere is not overwritten without you seeing it. Saving again replaces it.
• HTML in a document is shown as text, and links may only point at the web or at pages of the same site — the page belongs to an app that holds an SSH key to every machine.
• title: in a leading --- block, or the first # heading, names a document's tab; order: (a number) puts tabs first, the rest follow by title. A parts list for people as order: 1 and a page of detailed notes for your scripts or agents beside it works well.

Supported platforms

	System log	Disk	Containers	Unattended updates
Linux (systemd)	journalctl	✅	Docker	✅
Proxmox VE	journalctl	✅	— (guests via qm)	✅
OpenWrt	logread	✅	—	off by default

Each platform's update command, used when a server's own update_cmd is empty (the server form shows them under platform default):

Platform	Default update command
Linux (systemd)	sudo apt-get update -qq && sudo DEBIAN_FRONTEND=noninteractive apt-get -y -o Dpkg::Options::=--force-confold upgrade --with-new-pkgs && sudo apt-get autoremove -y && sudo apt-get clean
Proxmox VE	apt-get update -qq && DEBIAN_FRONTEND=noninteractive apt-get dist-upgrade -y && apt-get autoremove -y
OpenWrt	none

--with-new-pkgs matters: plain apt-get upgrade holds back any update that needs a package it does not have yet — a kernel ABI bump, a driver metapackage — so security kernels sit "kept back" and are never installed, and nothing says so. Unlike full-upgrade it never removes a package. --force-confold keeps a config file you edited instead of stopping at a prompt no one will answer.

OpenWrt has no default update command on purpose: an unattended apk upgrade can fill the overlay or land a kernel-module mismatch on the machine carrying the SSH session you would repair it from. Set update_cmd yourself if you want it.

Development

python3 -m venv .venv && .venv/bin/pip install -e '.[dev]'
.venv/bin/python -m pytest

TIMAR_DATA is the whole installation, so point it somewhere disposable to run against a throwaway copy instead of your real fleet:

TIMAR_DATA=/tmp/timar-dev TIMAR_PORT=8099 .venv/bin/python -m timar.web

Contributing

Contributions are welcome — see CONTRIBUTING.md. One habit up front: for anything that touches a machine, a network or a page, run it and put the measurement in the pull request. timar's failures are quiet — a magic packet that never leaves the host, a disk check that fails and reports all-clear — and a passing test does not always mean it works.

Commits are signed off under the DCO (git commit -s); there is no CLA. Design decisions and their pitfalls are in ARCHITECTURE.md.

License

MIT © 2026 Orkun Soylu. Third-party components, including the vendored htmx, are listed in THIRD-PARTY-NOTICES.md.