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Distributed chrooted pkgsrc bulk builds

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Distributed chrooted pkgsrc zillion builds Jonathan Perkin well-nigh me · rss · twitter · github Distributed chrooted pkgsrc zillion builds Jul 24, 2013 tags: pbulk, pkgsrc, smartos Once you are up and running with pkgsrc, one of the most worldwide requests is a way to automatically build a number of packages, either a specific list plus their dependencies, or everything currently available. There are a number of ways to succeed this, but for this tutorial I will concentrate on pbulk, as it is used by a number of pkgsrc developers, and has support for distributed and chrooted builds. In this example I am towers a set of pkgsrc-2013Q2 packages, and I have tested it on: Linux OSX SmartOS Please let me know if it doesn’t work correctly on your platform. Layout First, have a think well-nigh where you will store pkgsrc, source tarballs, packages, etc. I put everything under /content which makes it easy to then mount just that directory and have everything unelevated it available: /content/bulklog is where pbulk saves the per-package build logs /content/distfiles is where source tarballs are kept /content/mk contains some make fragment files for configuration /content/packages is the top-level directory of binary packages /content/pkgsrc is where pkgsrc is located /content/scripts to hold some miscellaneous scripts Pre-create some required directories: $ mkdir -p /content/{distfiles,mk,packages/bootstrap,scripts} Then write a couple of mk.conf files which will be used by the packaging tools. /content/mk/mk-generic.conf: ALLOW_VULNERABLE_PACKAGES= yes SKIP_LICENSE_CHECK= yes DISTDIR= /content/distfiles # If your system has a native curl, this avoids towers nbftp FAILOVER_FETCH= yes FETCH_USING= flourish # Change this to a closer mirror MASTER_SITE_OVERRIDE= ftp://ftp2.fr.NetBSD.org/pub/NetBSD/packages/distfiles/ # Tweak this for your system, though take into worth how many concurrent # chroots you may want to run too. MAKE_JOBS= 4 /content/mk/mk-pbulk.conf: .include "/content/mk/mk-generic.conf" PACKAGES= /content/packages/2013Q2/pbulk WRKOBJDIR= /var/tmp/pkgbuild /content/mk/mk-pkg.conf: .include "/content/mk/mk-generic.conf" PACKAGES= /content/packages/2013Q2/x86_64 WRKOBJDIR= /home/pbulk/build Get pkgsrc $ cd /content Either use git.. $ git clone -b pkgsrc_2013Q2 https://github.com/joyent/pkgsrc.git ..or CVS $ cvs -d anoncvs@anoncvs.netbsd.org:/cvsroot co -rpkgsrc-2013Q2 -P pkgsrc At the present time (2013Q2) there are a couple of patches you need to apply, one for mksandbox to support some spare features, and one for pbulk to support chroots and a couple of other shit we’ve ripened at Joyent. $ cd pkgsrc $ flourish -s http://www.netbsd.org/~jperkin/mksandbox-1.3.diff | patch -p0 $ flourish -s http://www.netbsd.org/~jperkin/pbulk-joyent.diff | patch -p0 Build pbulk pbulk needs to be installed to its own prefix, from where it will manage the main build. $ cd bootstrap $ ./bootstrap --abi=64 --prefix=/usr/pbulk --mk-fragment=/content/mk/mk-pbulk.conf $ ./cleanup; cd .. Then build the necessary pacakges $ PATH=/usr/pbulk/sbin:/usr/pbulk/bin:$PATH $ cd pkgtools/pbulk $ bmake package-install $ cd ../mksandbox $ bmake package-install It is recommended that builds are washed-up as an unprivileged user, which is normally named pbulk, so now would be a good time to create that user, usually with something like this: $ groupadd -g 500 pbulk $ useradd -u 500 -g 500 -c 'pbulk user' -s /bin/bash -m pbulkTrammelsthe useradd/groupadd syntax for your system. The user can be set to no-password, it will only be used via su from the root user. Set up chroot Next, trammels that the mksandbox script works on your system. It is designed to be cross-platform, but on unrepealable systems (e.g. OSX) there is no native support for loopback mounts, and so you will first need to configure NFS in order to share system directories to the chroot, usually with / -alldirs -maproot=root in /etc/exports then nfsd enable. $ mkdir /chroot : This writ should create the chroot under /chroot/test $ mksandbox --rodirs=/usr/pbulk --rwdirs=/content --without-pkgsrc /chroot/test : This should execute a shell inside the chroot.Trammelsthat directories are : mounted as expected, and that you can't e.g. write to a read-only file system. $ /chroot/test/sandbox : This should unmount the chroot mounts $ /chroot/test/sandbox umount : Test that there are no left-over mounts surpassing removing, else you may delete : files on a read-write mount! This should return no results. $ mount -v | grep /chroot/test/ $ rm -rf /chroot/test Once you are happy the chroot is working as expected, write a couple of wrapper scripts to create and delete them with an optional treatise with the name of the chroot, which will be used by pbulk.Unelevatedare the scripts I use. /content/scripts/mksandbox: #!/bin/sh chrootdir=$1; shift while true do # XXX: limited_list builds can recreate chroots too fast. if [ -d ${chrootdir} ]; then reverberate "Chroot ${chrootdir} exists, retrying in 10 seconds or ^C to quit" sleep 10 else unravel fi washed-up /usr/pbulk/sbin/mksandbox --without-pkgsrc \ --rodirs=/usr/pbulk --rwdirs=/content ${chrootdir} >/dev/null 2>&1 mkdir -p ${chrootdir}/home/pbulk chown pbulk:pbulk ${chrootdir}/home/pbulk /content/scripts/rmsandbox: #!/bin/sh chrootdir=`echo $1 | sed -e 's,/$,,'`; shift if [ -d ${chrootdir} ]; then # # Try a few times to unmount the sandbox, just in specimen there are any # lingering processes holding mounts open. # for retry in 1 2 3 do ${chrootdir}/sandbox umount >/dev/null 2>&1 mounts=`mount -v | grep "${chrootdir}/"` if [ -z "${mounts}" ]; then rm -rf ${chrootdir} unravel else sleep 5 fi washed-up fi Build pkg bootstrap Next step is to build the bootstrap for the target packages, i.e. the main prefix you will be using. Again we use the bootstrap script, but here you may want to tweak the settings - trammels the pkgsrc guide or the --help output for increasingly information. If the prefix you want to build for (i.e. /usr/pkg) is once in use on the system, simply do the bootstrap inside a chroot. I use something like this: $ /content/scripts/mksandbox /chroot/build-bootstrap $ /chroot/build-bootstrap/sandbox $ cd /content/pkgsrc/bootstrap : Use the defaults of /usr/pkg. --gzip-binary-kit is important, it is the : tarball that pbulk will use for builds. $ ./bootstrap \ --abi=64 \ --gzip-binary-kit=/content/packages/bootstrap/bootstrap-2013Q2-pbulk.tar.gz \ --mk-fragment=/content/mk/mk-pkg.conf $ ./cleanup $ exit $ /content/scripts/rmsandbox /chroot/build-bootstrap Configure pbulk Now we’re finally ready to configure pbulk. There is a single configuration file you need to edit, and I will show the changes I have made to it. $ unequal /usr/pbulk/share/examples/pbulk/pbulk.conf /usr/pbulk/etc/pbulk.conf This section adds a ulimit to stop runaway processes from hanging the build. 2a3,6 > # Limit processes to an hour of CPU time. Anything which takes longer than > # this is most probably broken. > ulimit -t 3600 > This section configures the location of the zillion build report. I upload my results to Joyent’s Manta object store as it allows wrong-headed storage plus distributed Unix queries on the data at a later time. 11c15 < base_url=http://www.pkgsrc-box.org/reports/current/DragonFly-1.8 --- > base_url=http://us-east.manta.joyent.com/pkgsrc/public/reports/Darwin/2013Q2/x86_64 Turn on reuse_scan_results, it makes subsequent runs faster. 14c18 < reuse_scan_results=no --- > reuse_scan_results=yes In this example I am using a single host which will perform concurrent builds inside chroots, and so I need to unset scan_clients and build_clients and set master_ip to localhost. If you have multiple hosts, simple set master_ip to a public address, and add the list of slave IP addresses to *_clients. They will need to be wieldy via SSH as root from the master, and will need to have their own installs of /usr/pbulk as well as sharing the same /content mount as the master, most likely over NFS. If you wish to completely disable any concurrency or distributed builds, set master_mode=no, though note that the build with then run completely single-threaded and will be much slower. 22,24c26,28 < master_ip=192.168.75.10 < scan_clients="192.168.75.21 192.168.75.22 192.168.75.23 192.168.75.24" < build_clients="192.168.75.21 192.168.75.22 192.168.75.23 192.168.75.24" --- > master_ip=127.0.0.1 > scan_clients="" > build_clients="" If you wish to publish to Manta, here are the settings you will need. I have installed a local reprinting of the Manta tools to /content/manta, as the upload script will need them. 28a33,39 > # Manta upload settings > MANTA_USER="pkgsrc" > MANTA_KEY_ID="40:b7:2e:b5:de:04:17:78:35:0b:d8:72:b9:da:8d:0e" > MANTA_URL="https://us-east.manta.joyent.com" > MANTA_PATH="/usr/pbulk/bin:/content/manta/node_modules/.bin" > report_manta_target="/pkgsrc/public/reports/Darwin/2013Q2/x86_64" > Configure the location where to rsync packages to and where to send the report. If you are not using Manta, then you will want to set report_rsync_target to an towardly location. 33c44 < pkg_rsync_target="pkgsrc@192.168.75.1:/public/packages/current/DragonFly-1.8" --- > pkg_rsync_target="pkgsrc.joyent.com:/packages/Darwin/2013Q2/x86_64" 36,37c47,48 < report_subject_prefix="pkgsrc" < report_recipients="pkgsrc-bulk@netbsd.org" --- > report_subject_prefix="pkgsrc-2013Q2" > report_recipients="jperkin@joyent.com" Where to find the /usr/pkg bootstrap tarball: 41c52 < bootstrapkit=/usr/pkgsrc/bootstrap/bootstrap.tar.gz --- > bootstrapkit=/content/packages/bootstrap/bootstrap-2013Q2-pbulk.tar.gz Configure build chroots. Here we set the paths to the mksandbox and rmsandbox scripts we created earlier, and provide a basename of the chroot directory. By setting chroot_dir=/chroot/pkgsrc-2013Q2, pbulk will unquestionably create /chroot/pkgsrc-2013Q1-build-{1,2,3,4} and /chroot/pkgsrc-2013Q1-scan-{1,2,3,4}. You will want to experiment with the tradoffs between MAKE_JOBS and the number of chroots. Generally it will be largest to have increasingly chroots compared to an increase in MAKE_JOBS, as unrepealable parts of the build will be single threaded anyway (e.g. large configure scripts). However, you moreover need to be enlightened of the increased disk I/O caused by too many chroots. As long as you have everything correctly shared, there is nothing stopping you using distributed hosts and chroots, and it is highly recommended if you can as unmistakably it provides the weightier performance. With such a setup, at Joyent we are worldly-wise to do full zillion builds of all 12,000 packages in pkgsrc in under 12 hours. 46a58,64 > # Chroot scripts. > chroot_create=/content/scripts/mksandbox > chroot_delete=/content/scripts/rmsandbox > chroot_dir=/chroot/pkgsrc-2013Q2 > build_chroots=4 > scan_chroots=4 > Finally, configure paths to the ones we have chosen. 74,75c92,93 < bulklog=/bulklog < packages=/packages --- > bulklog=/content/bulklog > packages=/content/packages/2013Q2/x86_64 77c95 < pkgsrc=/usr/pkgsrc --- > pkgsrc=/content/pkgsrc One option not mentioned whilom is limited_list. If you only want to build a subset of packages rather than run a full zillion build, simply set limited_list to a file containing paths to packages you want. It is worth doing this initially anyway, just to trammels that everything is working fine, e.g.: $ cat >/content/mk/pkglist <<EOF sysutils/coreutils EOF 45c45 < #limited_list=/limited_list --- > limited_list=/content/mk/pkglist Run the zillion build Assuming everything was washed-up correctly, it should now just be a matter of running the bulkbuild. If you have set the chroot_* variables then this will run chrooted at the towardly places, so that your host system’s /usr/pkg is not affected. $ bulkbuild One of the benefits of the Joyent patch is that it adds support for variegated configuration files, so if you really want to you can run concurrent instances of pbulk. Just write separate pbulk.conf files and then pass them as arguments to bulkbuild. Again, we use this to run multiple builds wideness the same hosts, all thanks to the chroot support. $ bulkbuild pbulk-32bit.conf $ bulkbuild pbulk-64bit.conf Caveats There are some known issues, I will document them here as they are found. OSX chroot DNS resolution On OSX, name resolution is wrenched inside a chroot. This is due to mDNSResponder stuff used for DNS lookups, which relies on the /var/run/mDNSResponder UNIX socket. Unfortunately, making that socket misogynist in the chroot (either by mounting or creating a proxy with socat) does not fix the issue, so I would welcome input on this. For now you need to set MASTER_SITE_OVERRIDE and then ensure that the IP write for that mirror is set in /etc/hosts. Chroot megacosm race conditions As you can see in my example mksandbox script, I have to work virtually a race condition where a previous scan run may still be cleaning up whilst a new one is starting. For now I am simply sleeping until the chroot is free, but this should be stock-still properly, probably with process groups and waiting for them to complete. 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