From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 11973 invoked from network); 4 Apr 2021 16:18:52 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 4 Apr 2021 16:18:52 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id CA3499CA51; Mon, 5 Apr 2021 02:18:50 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 012849C641; Mon, 5 Apr 2021 02:18:22 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id BF0B49C641; Mon, 5 Apr 2021 02:18:20 +1000 (AEST) Received: from ppsw-32.csi.cam.ac.uk (ppsw-32.csi.cam.ac.uk [131.111.8.132]) by minnie.tuhs.org (Postfix) with ESMTPS id 7E5CA9C63F for ; Mon, 5 Apr 2021 02:18:19 +1000 (AEST) X-Cam-AntiVirus: no malware found X-Cam-ScannerInfo: http://help.uis.cam.ac.uk/email-scanner-virus Received: from [90.251.56.255] (port=62860 helo=milebook.lan) by ppsw-32.csi.cam.ac.uk (smtp.hermes.cam.ac.uk [131.111.8.156]:25) with esmtpsa (PLAIN:fanf2) (TLS1.2:ECDHE-RSA-AES256-GCM-SHA384:256) id 1lT5S5-000Pe6-13 (Exim 4.94) (return-path ); Sun, 04 Apr 2021 17:18:17 +0100 Date: Sun, 4 Apr 2021 17:18:16 +0100 From: Tony Finch To: Dan Stromberg In-Reply-To: Message-ID: <3c7d43cd-3f3d-bbcc-ea93-f27289935d5c@dotat.at> References: <20210401145025.GA1202@naleco.com> <202104020700.13270EDK018774@freefriends.org> <202104021026.132AQhs5014565@freefriends.org> <20210402140229.GD1202@naleco.com> <20210402151650.GA8268@mcvoy.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Subject: Re: [TUHS] Zombified SCO comes back from the dead, brings trial back to life against IBM X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: The Eunuchs Hysterical Society Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" Dan Stromberg wrote: > > Please see https://stromberg.dnsalias.org/~strombrg/why-solaris.html for a > list of benefits of 5.5 over 4.1.x. A few of those are distinctly mixed blessings :-) I learned about Solaris's in-kernel telnet the hard way, trying to debug a system on which telnet would not work properly after rebooting. I think I worked it out by trussing telnetd, which showed me that it was trying to load a kernel module, and failing because we had chrooted it. A bit of searching around told me what the module was for. The Solaris automounter was neat - we did clever things with the userland part, and it mostly performed well because the fast path was in the kernel. Except that it didn't have a cache for ENOENT directory entries, so requests for nonexistent paths always took a trip to userland, and (as far as I could tell) these requests were serialized, and if you managed to overload the automounter it would start returning bogus errors - I think it was EPERM. Our Apache httpd started randomly returning 403 errors when it tried to access a missing .htaccess (which it did on every request!) and got EPERM instead. The name service cache was also problematic. It was probably useful for getpwnam() etc. on systems using NIS, but it behaved very badly on systems that sent a lot of DNS queries through nscd. It worked much better for us if we simply prevented it from running at all. And I'm not entirely sure it was all that great for NIS: another problem I heard of second hand was password files getting truncated when lots of users were trying to change their passwords at the same time. My colleagues fixed that by ensuring all password changes happened on the NIS master with suitable locking, and the password files were periodically replicated with rdist instead of using more normal NIS machinery. Tony. -- f.anthony.n.finch https://dotat.at/ Shetland Isles: West 7 or gale 8, veering northwest gale 8 or severe gale 9, occasionally storm 10 later. Moderate or rough, becoming very rough in sheltered east, otherwise very rough becoming high or very high. Rain then squally snow showers. Moderate or poor, occasionally good.