Anso
64bf6344a3
* fix(mesh): reserve Sencho static IP via IPAM auxiliary address (F-13)
Sencho pins itself to <network>+2 on sencho_mesh, but the IPAM block only
declared Subnet, so Docker freely handed that address to any meshed
workload that restarted while Sencho was offline. A real-world hit on
arrapps-prod during a Sencho upgrade had tautulli grab 172.30.0.2, which
blocked the new Sencho container's mesh attach with "Address already in
use" and left compose in a half-state needing manual disconnect/recreate.
The fix reserves <network>+2 via AuxiliaryAddresses on the IPAM Config
when creating sencho_mesh. Aux-listed addresses are removed from the
auto-allocatable pool, so Docker refuses to hand the IP to any container
that does not explicitly request it. Sencho's own attach via
connectContainerToNetwork({ ipv4Address }) is unaffected because
explicit pins still bind aux-reserved addresses. Workload containers
without a pinned IP get .3 and up.
Wire format verified against the Docker Engine REST v1.33 OpenAPI spec:
the JSON key on POST /networks/create (and on the inspect response) is
AuxiliaryAddresses inside each IPAM.Config item, value { sencho: <ip> }.
Adopt-existing path: when Sencho boots against a sencho_mesh that
pre-dates this reservation, the data plane still comes up but a one-time
warn fires (mesh.enable activity at level: 'warn' plus a [Mesh] console
line so docker logs surfaces it). The advisory explains the squat risk
and gives the recreate recipe.
Tests: 5 cases added to mesh-setup-error-classification.test.ts covering
the explicit-env create payload, the candidate-iteration winner payload,
the adopt-legacy warn (env-unset), the adopt-already-reserved silent
path, and the TOCTOU 409 race-winner adopt-legacy warn.
Docs: one sentence added to docs/features/sencho-mesh.mdx under
"Customising the mesh subnet" describing the reservation positively.
No tier/role/capability/flag gates touched (no frontend changes).
* fix(mesh): use IPRange upper-half bias instead of aux-address reservation
The initial F-13 fix used IPAM AuxiliaryAddresses to reserve <network>+2
on sencho_mesh. Empirical probe against Docker 29.4.3 confirmed this
also blocks explicit pins via EndpointConfig.IPAMConfig.IPv4Address:
libnetwork's RequestAddress() rejects a preferred-address request when
the bit is already set by the aux reservation. Result: the freshly-
reserved network refuses Sencho's own ensureSelfAttached, and the data
plane never comes up.
The pivot uses IPRange instead. IPRange constrains Docker's auto-
allocation to the configured CIDR; preferred-address requests via
RequestAddress(prefAddress) skip the IPRange check and only consult
the subnet-wide bitmap. So setting IPRange to the upper half of the
subnet (e.g. 172.30.0.128/25 for 172.30.0.0/24) biases workloads
without an explicit IP to <network>+128 and up, while Sencho's
explicit pin to <network>+2 still succeeds.
Verified on Docker 29.4.3 with the same workstation that produced the
original audit:
- `docker run --rm --network N --ip 10.99.99.2` against a network
with `--aux-address sencho=10.99.99.2` → "Address already in use"
(rejects explicit pin).
- Same `--ip` against a network with `--ip-range 10.99.99.128/25` →
succeeds (10.99.99.2 is outside the range but inside the subnet).
- Auto-allocated workload on the IPRange network lands at .129.
Adopt-existing legacy detection now compares IPRange instead of
AuxiliaryAddresses. inspectExistingMeshSubnet returns { subnet,
ipRange } and the warn fires when ipRange differs from the expected
upper-half CIDR. Same once-per-process semantics as before.
createMeshNetwork now derives the IPRange via a new
getMeshIpRangeFromSubnet helper. The five regression tests assert
IPRange = <network>+128/<prefix+1> in the create payload and the
expected/actual IPRange in the legacy-warn details.
Self-hosted Docker Compose management for one machine or a fleet.
Docs · Website · Discussions · Sponsor
What Sencho is
Sencho is for homelab operators, small DevOps teams, and platform engineers who run services on Docker Compose, want a graphical interface without giving up file-on-disk workflows, and need to manage more than one machine without SSH gymnastics or a VPN.
It runs as a single container on your hardware and gives you a UI for the work you currently do over SSH on compose stacks: deploying, editing files, watching logs, restarting containers, browsing volumes, and recovering from failures. Your compose files stay on the host filesystem and remain the source of truth.
A Sencho instance is autonomous. To manage another machine, you install a second Sencho on it and connect them with a long-lived API token; the primary dashboard then acts as a transparent HTTPS proxy across your fleet. There is no SSH and no exposed Docker socket. For nodes behind NAT or strict firewalls, the Pilot Agent establishes a single outbound WebSocket tunnel to the primary, so the remote host opens no inbound port at all.
Most capabilities are free in the Community tier. A few advanced automation and fleet-control features ship in paid tiers; pricing lives at sencho.io/pricing.
Capabilities
Stacks
- Full Compose lifecycle: create, deploy, restart, stop, pull
- Monaco editor with diff preview before save and one-click rollback
- Git-sourced stacks pulled and synced from any repository
- File explorer for compose, env, and supporting files
- Stack labels for grouping and bulk operations
- App Store with LinuxServer.io templates
Observability
- Aggregated log search and stream across every container in the fleet
- Live container stats, health checks, and image-update notifications
- Threshold alerts for CPU, memory, and network
- Read-only audit log of every action
- Network topology view of containers, networks, and nodes
Fleet
- Multi-node management via authenticated HTTP and WebSocket proxy
- Fleet view with grid and topology layouts
- Fleet snapshots of compose and env across the fleet
- Pilot Agent for nodes behind NAT or strict firewalls
- Node compatibility checks before deploying
Automation
- Auto-heal policies for failed containers
- Auto-update policies for image rollouts
- Scheduled operations on cron
- Blueprints: declarative fleet templates with drift detection
- Webhooks on stack lifecycle events
- Encrypted Fleet Secrets pushed to labeled nodes
Security
- SSO: custom OIDC, presets for Google, GitHub, and Okta, plus LDAP and Active Directory
- Two-factor authentication with TOTP and backup codes
- RBAC with admin, editor, and viewer roles
- Vulnerability scanning via Trivy with VEX-based suppression and SARIF export
- Private registries and deploy enforcement for non-compliant images
- API tokens for automation
Operations
- Host console in the browser
- Sencho Cloud Backup for off-site stack archives
- Notification routing to Slack, Discord, email, and webhooks
- Global search across stacks, containers, and services
- Resources view for images, volumes, and networks with scoped prune actions
Quick start
Sencho runs in a single container.
services:
sencho:
image: saelix/sencho:latest
container_name: sencho
restart: unless-stopped
ports:
- "1852:1852"
volumes:
- /var/run/docker.sock:/var/run/docker.sock
- ./data:/app/data
# 1:1 Compose Path Rule: the host path MUST match the container path
- /opt/docker:/opt/docker
environment:
- COMPOSE_DIR=/opt/docker
- DATA_DIR=/app/data
docker compose up -d
Open http://your-server:1852 and create your admin account.
Always front Sencho with a TLS-terminating reverse proxy in production. See the self-hosting guide for hardening, environment variables, and reverse-proxy examples.
Run with docker run instead
docker run -d --name sencho \
-p 1852:1852 \
-v /var/run/docker.sock:/var/run/docker.sock \
-v sencho_data:/app/data \
-e COMPOSE_DIR=/opt/docker \
saelix/sencho:latest
For the full walkthrough, see the quickstart guide.
Adding remote nodes
To manage a second machine, install Sencho on it the same way, then add it from the primary dashboard with its URL and a long-lived API token. The primary proxies authenticated HTTPS and WebSocket requests to the remote instance. No SSH, no exposed Docker socket, no agent process on the remote. Nodes behind NAT or strict firewalls can opt into the Pilot Agent for outbound-only connectivity.
See the multi-node guide for the full token-bearer flow.
Screenshots
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Documentation, community, and license
- Documentation: docs.sencho.io
- Community: GitHub Discussions
- Contributing: CONTRIBUTING.md
- Security: SECURITY.md. Do not open public issues for security vulnerabilities.
- License: Business Source License 1.1. Free for production use; the only restriction is offering Sencho as a competing hosted or managed service. Converts to Apache 2.0 on 2030-03-25.