> ## Documentation Index
> Fetch the complete documentation index at: https://docs2.openclaw.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Linux app

The Gateway is fully supported on Linux. Node is the recommended runtime; Bun
is not recommended (known WhatsApp/Telegram issues).

There is no native Linux companion app yet. Contributions are welcome.

## Quick path (VPS)

1. Install Node 24 (recommended) or Node 22.19+ (LTS, still supported).
2. `npm i -g openclaw@latest`
3. `openclaw onboard --install-daemon`
4. From your laptop: `ssh -N -L 18789:127.0.0.1:18789 <user>@<host>`
5. Open `http://127.0.0.1:18789/` and authenticate with the configured shared
   secret (token by default; password if `gateway.auth.mode` is `"password"`).

Full server guide: [Linux Server](/vps). Step-by-step VPS example:
[exe.dev](/install/exe-dev).

## Install

* [Getting Started](/start/getting-started)
* [Install & updates](/install/updating)
* Optional: [Bun (experimental)](/install/bun), [Nix](/install/nix), [Docker](/install/docker)

## Gateway service (systemd)

Install with one of:

```bash theme={"theme":{"light":"min-light","dark":"min-dark"}}
openclaw onboard --install-daemon
openclaw gateway install
openclaw configure   # select "Gateway service" when prompted
```

Repair or migrate an existing install:

```bash theme={"theme":{"light":"min-light","dark":"min-dark"}}
openclaw doctor
```

`openclaw gateway install` renders a systemd **user** unit by default. Full
service guidance, including the **system**-level unit variant for shared or
always-on hosts, lives in the [Gateway runbook](/gateway#supervision-and-service-lifecycle).

Write a unit by hand only for a custom setup. Minimal user-unit example
(`~/.config/systemd/user/openclaw-gateway[-<profile>].service`):

```ini theme={"theme":{"light":"min-light","dark":"min-dark"}}
[Unit]
Description=OpenClaw Gateway (profile: <profile>, v<version>)
After=network-online.target
Wants=network-online.target
StartLimitBurst=5
StartLimitIntervalSec=60

[Service]
ExecStart=/usr/local/bin/openclaw gateway --port 18789
Restart=always
RestartSec=5
RestartPreventExitStatus=78
TimeoutStopSec=30
TimeoutStartSec=30
SuccessExitStatus=0 143
OOMPolicy=continue
KillMode=control-group

[Install]
WantedBy=default.target
```

Enable it:

```bash theme={"theme":{"light":"min-light","dark":"min-dark"}}
systemctl --user enable --now openclaw-gateway[-<profile>].service
```

## Memory pressure and OOM kills

On Linux, the kernel picks an OOM victim when a host, VM, or container cgroup
runs out of memory. The Gateway is a poor victim because it owns long-lived
sessions and channel connections, so OpenClaw biases transient child
processes to be killed first when possible.

For eligible Linux child spawns, OpenClaw wraps the command in a short
`/bin/sh` shim that raises the child's own `oom_score_adj` to `1000`, then
`exec`s the real command. This is unprivileged: a process may always raise
its own OOM score.

Covered child process surfaces:

* Supervisor-managed command children
* PTY shell children
* MCP stdio server children
* OpenClaw-launched browser/Chrome processes (via the plugin SDK process runtime)

The wrapper is Linux-only and skipped when `/bin/sh` is unavailable, or when
the child env sets `OPENCLAW_CHILD_OOM_SCORE_ADJ` to `0`, `false`, `no`, or
`off`.

Verify a child process:

```bash theme={"theme":{"light":"min-light","dark":"min-dark"}}
cat /proc/<child-pid>/oom_score_adj
```

Expected value for covered children is `1000`; the Gateway process itself
keeps its normal score (usually `0`).

The systemd unit's `OOMPolicy=continue` keeps the Gateway service alive when
a transient child is selected by the OOM killer instead of marking the whole
unit failed and restarting all channels; the failed child/session reports its
own error.

This does not replace normal memory tuning. If a VPS or container repeatedly
kills children, raise the memory limit, reduce concurrency, or add stronger
resource controls (systemd `MemoryMax=`, container memory limits).

## Related

* [Install overview](/install)
* [Linux server](/vps)
* [Raspberry Pi](/platforms/raspberry-pi)
* [Gateway runbook](/gateway)
* [Gateway configuration](/gateway/configuration)