Bug #13007: Webbrick takes 5s to start when machine name looks like a real domain

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: 2.3.3
• Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN

[grosser (Michael Grosser)]

sudo scutil --set HostName foo.local
ruby -r socket -e "Socket.gethostbyname(Socket.gethostname)"

or much simpler:

ruby -r socket -e "Socket.gethostbyname('foo.local')"

called from webrick/config.rb:24 ... Utils::getservername

Ideally this should be lazy, so I can override ServerName and avoid this ...
or not do a remote lookup at all by default

[shyouhei (Shyouhei Urabe)]

Sad news is gethostbyname blocks under the hood in the system library, not in ruby's code.

But webrick's issue might be resolved already by issue #6559. Can you try the latest trunk to see if that fixed your problem?

[shyouhei (Shyouhei Urabe)]

• Related to Feature #6559: Set DoNotReverseLookup to true in Webrick added

[shugo (Shugo Maeda)]

Shyouhei Urabe wrote:

Sad news is gethostbyname blocks under the hood in the system library, not in ruby's code.

But webrick's issue might be resolved already by issue #6559. Can you try the latest trunk to see if that fixed your problem?

It seems not a reverse lookup issue, but a forward lookup issue.

It sounds reasonable to delay the call of Utils.getservername so that
users can override ServerName, in which case there's no need to call
Utils.getservername.

[shyouhei (Shyouhei Urabe)]

Hmm, I see. No objection for the approach then.

[shugo (Shugo Maeda)]

• Status changed from Open to Closed

Applied in changeset r57014.

---

Delay Utils.getservername until needed.

There is no need to call Utils.getservername when the :ServerName option is
specified, so delay Utils.getservername until needed to avoid unnecessary
DNS lookups. [ruby-core:78492] [Bug #13007]