Date: Thu, 16 Aug 2018 09:25:37 +0200 From: "Patrick M. Hausen" <hausen@punkt.de> To: Mark Johnston <markj@freebsd.org> Cc: David Powers via freebsd-virtualization <freebsd-virtualization@freebsd.org>, freebsd-dtrace@freebsd.org Subject: Re: Why can't I dtrace processes running in a jail from the host? Message-ID: <5BD4792C-D8AB-4598-BE7A-9D63A5757392@punkt.de> In-Reply-To: <20180810183419.GA52302@raichu> References: <FB08F1C9-C066-4C78-8D35-E2A522ADC8F8@punkt.de> <20180809145258.GA68459@raichu> <8B1BDE9F-BDAD-4CEB-B7A2-8052497F50EA@punkt.de> <20180810183419.GA52302@raichu>
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Good morning, I did some further investigation and with help from Mark was finally able to get it working. Took quite some effort - documentation on the PHP side - NULL :-/ BTW: has anyone ever successfully subscribed to one of the PHP mailing lists? Where is the community of the people developing that stuff? OK, back to topic, in fact I had two issues, one FreeBSD, one PHP related. 1. DTrace'ing jailed userland probes requires /dev/dtrace/* to be visible inside the jail. Hence: [devfsrules_proserver=3D100] add include $devfsrules_jail add path dtrace/* unhide iocage set devfs_ruleset=3D100 vpro0069 Voila - dtrace on the host, watch userland probes in the jail. 2. PHP > 5.6 needs the environment variable USE_ZEND_DTRACE to be set to register it's probes. Turned out that it was not sufficient to *configure* that into the PHP FPM worker but you need to set (and export) the variable on the shell before you start the FPM master daemon. Then everything works as = expected. What I regularly do in such a case is sh -x /usr/local/etc/rc.d/php-fpm start to find out what command is actually executed in the end. Then call that = directly after setting the environment. Result: setenv USE_ZEND_DTRACE 1 limits -C daemon /usr/local/sbin/php-fpm Bingo! Surprisingly enough it is *not* necessary to configure clear_env =3D no in PHP FPM ... DTrace is active as soon as the master daemon sees that environment variable. Kind regards Patrick --=20 punkt.de GmbH Internet - Dienstleistungen - Beratung Kaiserallee 13a Tel.: 0721 9109-0 Fax: -100 76133 Karlsruhe info@punkt.de http://punkt.de AG Mannheim 108285 Gf: Juergen Egeling
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