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 autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 20884 invoked from network); 25 Oct 2021 13:26:49 -0000 Received: from alyss.skarnet.org (95.142.172.232) by inbox.vuxu.org with ESMTPUTF8; 25 Oct 2021 13:26:49 -0000 Received: (qmail 11007 invoked by uid 89); 25 Oct 2021 13:27:14 -0000 Mailing-List: contact supervision-help@list.skarnet.org; run by ezmlm Sender: Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Received: (qmail 11000 invoked from network); 25 Oct 2021 13:27:14 -0000 From: "Laurent Bercot" To: "Rio Liu" , supervision@list.skarnet.org Subject: Re: A program that can get exactly the log of a supervised process? Date: Mon, 25 Oct 2021 13:26:48 +0000 Message-Id: In-Reply-To: References: Reply-To: "Laurent Bercot" User-Agent: eM_Client/8.2.1659.0 Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: -100 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvtddrvdefhedgiedvucetufdoteggodftvfcurfhrohhfihhlvgemucfpfgfogfftkfevteeunffgpdfqfgfvnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhvffufffkjghfrhgfgggtgfesthhqredttderjeenucfhrhhomhepfdfnrghurhgvnhhtuceuvghrtghothdfuceoshhkrgdqshhuphgvrhhvihhsihhonhesshhkrghrnhgvthdrohhrgheqnecuggftrfgrthhtvghrnhepvdfgveffueelgedvkedtffetgedvieeifeektefgueehffehleehjefhveeuieejnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmohguvgepshhmthhpohhuth >Why not have the grepper listen on the log file directly? You'll need to h= ave a timestamp in the log and know where the log is, but those can be know= n at the time of writing the service script. There's no such thing as "the log file". There's the log backendS, which can be one or more automatically rotated log files in a directory, status files, network backends, etc. The only way to access the log stream in a reliable and generic way is to read it on the way to the backends. You have no control over what happens later on. -- Laurent