nginx/nginx · error

NGX_LOG_EMERG

NGX_LOG_EMERG

Error message

gethostname() failed

What it means

Error "gethostname() failed" thrown in nginx/nginx.

Source

Thrown at src/core/ngx_cycle.c:208

        ngx_destroy_pool(pool);
        return NULL;
    }

    ngx_memzero(cycle->listening.elts, n * sizeof(ngx_listening_t));


    ngx_queue_init(&cycle->reusable_connections_queue);


    cycle->conf_ctx = ngx_pcalloc(pool, ngx_max_module * sizeof(void *));
    if (cycle->conf_ctx == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }


    if (gethostname(hostname, NGX_MAXHOSTNAMELEN) == -1) {
        ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "gethostname() failed");
        ngx_destroy_pool(pool);
        return NULL;
    }

    /* on Linux gethostname() silently truncates name that does not fit */

    hostname[NGX_MAXHOSTNAMELEN - 1] = '\0';
    cycle->hostname.len = ngx_strlen(hostname);

    cycle->hostname.data = ngx_pnalloc(pool, cycle->hostname.len);
    if (cycle->hostname.data == NULL) {
        ngx_destroy_pool(pool);
        return NULL;
    }

    ngx_strlow(cycle->hostname.data, (u_char *) hostname, cycle->hostname.len);

View on GitHub (pinned to 3f6f7824d4)

When it happens

Trigger: Thrown at src/core/ngx_cycle.c:208 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of nginx/nginx@3f6f7824d4 (2026-08-22). Data as JSON: /api/errors/0bfbf6ce2d1bc91b. Report an issue: GitHub.