louislam/uptime-kuma · error · Error

Failed to load docker host config

Error message

Failed to load docker host config

What it means

Thrown by a Docker monitor when R.load("docker_host", this.docker_host) returns nothing. The monitor cannot run without the host's connection details, and there is no fallback, so a missing host row aborts the beat.

Source

Thrown at server/model/monitor.js:800

                        url: `/containers/${this.docker_container}/json`,
                        timeout: this.interval * 1000 * 0.8,
                        headers: {
                            Accept: "*/*",
                        },
                        httpsAgent: new https.Agent({
                            maxCachedSessions: 0, // Use Custom agent to disable session reuse (https://github.com/nodejs/node/issues/3940)
                            rejectUnauthorized: !this.getIgnoreTls(),
                            secureOptions: crypto.constants.SSL_OP_LEGACY_SERVER_CONNECT,
                        }),
                        httpAgent: new http.Agent({
                            maxCachedSessions: 0,
                        }),
                    };

                    const dockerHost = await R.load("docker_host", this.docker_host);

                    if (!dockerHost) {
                        throw new Error("Failed to load docker host config");
                    }

                    if (dockerHost._dockerType === "socket") {
                        options.socketPath = dockerHost._dockerDaemon;
                    } else if (dockerHost._dockerType === "tcp") {
                        options.baseURL = DockerHost.patchDockerURL(dockerHost._dockerDaemon);
                        options.httpsAgent = new https.Agent(
                            await DockerHost.getHttpsAgentOptions(dockerHost._dockerType, options.baseURL)
                        );
                    }

                    log.debug("monitor", `[${this.name}] Axios Request`);
                    let res = await axios.request(options);

                    if (!res.data.State) {
                        throw Error("Container state is not available");
                    }
                    if (!res.data.State.Running) {

View on GitHub (pinned to 6b5ea01557)

Solutions

1. Open Settings -> Docker Hosts and recreate or verify the host exists
2. Re-assign the monitor to an existing Docker host, or delete the orphaned monitor
3. Inspect the docker_host table for integrity if the issue recurs

// Confirm the referenced docker host exists before saving/running the monitor
const host = await R.findOne("docker_host", " id = ? ", [monitor.docker_host]);
if (!host) throw new Error(`docker_host id ${monitor.docker_host} does not exist`);

When it happens

Trigger: The docker_host id stored on the monitor does not resolve to any row in the docker_host table.

Common situations: Docker host was deleted from Settings -> Docker Hosts while monitors still reference it; an incomplete DB restore/migration; a monitor imported without its host.

Related errors

• Invalid db-config.json, type must be a string
• Unknown Database type: ${dbConfig.type}
• Unknown Monitor Type
• Both ${envName} and ${envName}_FILE are set. Please use only
• Failed to read ${envName}_FILE at ${fileValue}: ${err.messag

AI-assisted analysis of louislam/uptime-kuma@6b5ea01557 (2026-08-12). Data as JSON: /api/errors/cabc5e5a6eefbed0. Report an issue: GitHub.