Merge pull request #16433 from vespa-engine/hmusum/print-info-when-fallback-to-localhost

Print info when detecting hostname fails and we fallback to localhost

1 files changed, 4 insertions, 0 deletions

diff --git a/vespalib/src/apps/vespa-detect-hostname/detect_hostname.cpp b/vespalib/src/apps/vespa-detect-hostname/detect_hostname.cpp
index 5c84790a669..d65c8f20e12 100644
--- a/vespalib/src/apps/vespa-detect-hostname/detect_hostname.cpp
+++ b/vespalib/src/apps/vespa-detect-hostname/detect_hostname.cpp
@@ -49,6 +49,10 @@ int main(int, char **) {
     if (check(my_hostname, my_ip_set, my_hostname_error)) {
         fprintf(stdout, "%s\n", my_hostname.c_str());
     } else if (check(localhost, my_ip_set, localhost_error)) {
+        fprintf(stderr, "WARN: hostname detection failed, falling back to local hostname: %s", localhost.c_str());
+        fprintf(stderr, "  WARN: canonical hostname (from gethostname/getaddrinfo): %s\n", my_hostname.c_str());
+        fprintf(stderr, "  WARN: %s\n", my_hostname_error.c_str());
+
         fprintf(stdout, "%s\n", localhost.c_str());
     } else {
         fprintf(stderr, "FATAL: hostname detection failed\n");