Walk-thru- Build Lustre MASTER on RHEL 7.3/CentOS 7.3 from Intel Git

<<< In progress >>

This walk-thru is targeting developers who want to explore the bleeding edge of Lustre. If you are evaluating Lustre for production, you should choose a Lustre Release.

Purpose

Describe the steps you need to build and test a Lustre system (MGS, MDT, MDS, OSS, OST, client) from the HPDD master branch on a x86_64, RHEL/CentOS 7.3 machine.

Prerequisite

A newly installed RHEL/CentOS 7.3 x86_64 machine connected to the internet.
EPEL Repository: this is a convenient source for git.
NOTE It is suggested that you have at least 1GB of memory on the machine you are using for the build.
NOTE Verify that selinux is disabled.

Overview

pre-built RPMs are available

Lustre servers require a patched and compiled kernel. A patched and compiled Lustre server kernel is available from Intel. A separate page is available to walk thru setting up Lustre with these pre-built RPMs. This document is for those who wish to build their Lustre system from source. Note that if you are not modifying the kernel patches on the server, it is possible to use the pre-built Lustre server kernel RPMs, and only build the Lustre code. Note that a patched kernel is NOT needed for the Lustre client.

Patches are available in the HPDD Git source repository. A test suite is included with the Lustre source. This document walks through the steps of patching the kernel, building Lustre and running a basic test of the complete system.

Procedure

The procedure requires that a OS is setup for development - this includes Lustre sources, kernel source and build tools. Once setup, a new kernel can be patched, compiled, run and tested. Further reading on building a RHEL RPM based kernel is available from, among other sources, the CentOS site.

Provision machine and installing dependencies.

Once RHEL 7.3 is newly installed on rhel6-master login as root.

Install the kernel development tools.

# yum -y groupinstall "Development Tools"

Problem with installing 'Development Tools'

If the Development Tools group is not be available for some reason, you may find the following list if individual packages necessary to install.

# yum -y install automake xmlto asciidoc elfutils-libelf-devel zlib-devel binutils-devel newt-devel python-devel hmaccalc perl-ExtUtils-Embed rpm-build make gcc redhat-rpm-config patchutils git

Install additional dependencies

# yum -y install xmlto asciidoc elfutils-libelf-devel zlib-devel binutils-devel newt-devel python-devel hmaccalc perl-ExtUtils-Embed bison elfutils-devel audit-libs-devel

Install EPEL 7

# rpm -ivh http://download.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-9.noarch.rpm

Install quilt and libselinux-devel

# yum -y install pesign numactl-devel pciutils-devel ncurses-devel

Preparing the Lustre source.

Create a user build with the home directory /home/build
```
# useradd -m build
```
Switch to the user build and change to the build $HOME directory.
```
# su build
$ cd $HOME
```

Get the MASTER branch from HPDD git.

$ git clone git://git.hpdd.intel.com/fs/lustre-release.git
$ cd lustre-release

Run sh ./autogen.sh

Resolve any outstanding dependencies until autogen.sh completes successfully. Success will look like:

$ sh ./autogen.sh
configure.ac:10: installing 'config/config.guess'
configure.ac:10: installing 'config/config.sub'
configure.ac:12: installing 'config/install-sh'
configure.ac:12: installing 'config/missing'
libcfs/libcfs/autoMakefile.am: installing 'config/depcomp'
$

Prepare a patched kernel for Lustre

You can have different ways to prepare a patched kernel for Lustre. The easier method is to download built RPM packages from build.hpdd.intel.com. For example, if you're running el7, you should download the packages from here: https://build.hpdd.intel.com/view/Non-Reviews/job/lustre-master/arch=x86_64,build_type=server,distro=el7,ib_stack=inkernel/lastSuccessfulBuild/artifact/artifacts/RPMS/x86_64/ at the time when this page is written. You're going to need the packages starting with 'kernel-'. After new kernel packages are downloaded, you can skip the following few steps and go to the section 'Installing the Lustre kernel and rebooting'.

If you want a more challenge life, you can patch the kernel by yourself, in that case, please follow the steps below.

Prepare the kernel source

In this walk-thru, the kernel is built using rpmbuild - a tool specific to RPM based distributions.

Get the kernel source. First create the directory structure, then get the source from the RPM. Create a .rpmmacros file to install the kernel source in our user dir.
```
$ cd $HOME
$ mkdir -p kernel/rpmbuild/{BUILD,RPMS,SOURCES,SPECS,SRPMS}
$ cd kernel
$ echo '%_topdir %(echo $HOME)/kernel/rpmbuild' > ~/.rpmmacros
```

Install the kernel source:

$ rpm -ivh http://vault.centos.org/7.3.1611/updates/Source/SPackages/kernel-3.10.0-514.2.2.el7.src.rpm

Prepare the source using rpmbuild.

$ cd ~/kernel/rpmbuild
$ rpmbuild -bp --target=`uname -m` ./SPECS/kernel.spec

This will end with:

...
+ make ARCH=x86_64 oldnoconfig
scripts/kconfig/conf --olddefconfig Kconfig
#
# configuration written to .config
#
+ echo '# x86_64'
+ cat .config
+ find . '(' -name '*.orig' -o -name '*~' ')' -exec rm -f '{}' ';'
+ find . -name .gitignore -exec rm -f '{}' ';'
+ cd ..
+ exit 0

At this point, we now have kernel source, with all the RHEL/CentOS patches applied, residing in the directory ~/kernel/rpmbuild/BUILD/kernel-3.10.0-514.2.2.el7/linux-3.10.0-514.2.2.el7.x86_64/

Patch the kernel source with the Lustre code.

Gather all the patches from lustre tree into a single file

$ cd ~
$ full_patch="~/lustre-kernel-x86_64-lustre.patch"
$ rm -f ${full_patch}
$ cd ~/lustre-release/lustre/kernel_patches/series

$ for patch in $(<"3.10-rhel7.series"); do \
      patch_file="~/lustre-release/lustre/kernel_patches/patches/${patch}" \
      cat "${patch_file}" >> "${full_patch}" \
  done
$

Copy the lustre kernel patch into RPM build tree

# cp ~/lustre-kernel-x86_64-lustre.patch ~/kernel/rpmbuild/SOURCES/patch-3.10.0-lustre.patch

Edit the kernel spec file by vi ~/kernel/rpmbuild/SPEC/kernel.spec
Find the line with 'find $RPM_BUILD_ROOT/lib/modules/$KernelVer' and insert following two lines below it
```
cp -a fs/ext3/* $RPM_BUILD_ROOT/lib/modules/$KernelVer/build/fs/ext3 
```
```
cp -a fs/ext4/* $RPM_BUILD_ROOT/lib/modules/$KernelVer/build/fs/ext4
```
Find the line with '# empty final patch to facilitate testing of kernel patches' and insert following two lines below it
```
# adds Lustre patches
```
```
Patch99995: patch-%{version}-lustre.patch
```
Find the line with 'ApplyOptionalPatch linux-kernel-test.patch' and insert following two lines below it
```
# lustre patch
```
```
ApplyOptionalPatch patch-%{version}-lustre.patch
```
Find the line with '%define listnewconfig_fail 1' and change 1 to 0
Save and close the spec file.
overwrite the .config file with ~/lustre-release/lustre/kernel_patches/kernel_configs/kernel-2.6.32-2.6-rhel6-x86_64.config

# cp ~/lustre-release/lustre/kernel_patches/kernel_configs/kernel-2.6.32-2.6-rhel6-x86_64.config ./.config

link the Lustre series and patches

# ln -s ~/lustre-release/lustre/kernel_patches/series/2.6-rhel6.series series
# ln -s ~/lustre-release/lustre/kernel_patches/patches patches

Apply the patches to the kernel source using quilt

# quilt push -av
...
...
patching file fs/jbd2/transaction.c
Hunk #3 succeeded at 1222 (offset 3 lines).
Hunk #4 succeeded at 1357 (offset 3 lines).

Now at patch patches/jbd2-jcberr-2.6-rhel6.patch

Build the new kernel as an RPM.

Go into the kernel source directory and issue the following commands to build a kernel rpm.

# cd ~/kernel/rpmbuild/BUILD/kernel-2.6.32-431.5.1.el6/linux-2.6.32-431.5.1.el6.x86_64/
# make oldconfig || make menuconfig
# make include/asm
# make include/linux/version.h
# make SUBDIRS=scripts
# make include/linux/utsrelease.h
# make rpm
 
NOTE: with RHEL 7,
# make oldconfig
# make -j4 rpm

A successful build will return:

...
...
Wrote: /home/build/kernel/rpmbuild/SRPMS/kernel-2.6.32lustremaster-1.src.rpm
Wrote: /home/build/kernel/rpmbuild/RPMS/x86_64/kernel-2.6.32.lustremaster-1.x86_64.rpm
Executing(%clean): /bin/sh -e /var/tmp/rpm-tmp.f73m1V
+ umask 022
+ cd /home/build/kernel/rpmbuild/BUILD
+ cd kernel-2.6.32lustremaster
+ rm -rf /home/build/kernel/rpmbuild/BUILDROOT/kernel-2.6.32.lustremaster-1.x86_64
+ exit 0
rm ../kernel-2.6.32lustremaster.tar.gz

If you receive a request to generate more entropy, you need to trigger some disk I/O or keyboard I/O. In another terminal, you can either type randomly or execute the following command to generate entropy:

# grep -Ri 'intel' /usr

At this point, you should have a fresh kernel RPM ~/kernel/rpmbuild/RPMS/x86_64/kernel-2.6.32.lustremaster-1.x86_64.rpm

Installing the Lustre kernel and rebooting.

1. As root, Install the kernel
```
# rpm -ivh $PKG_PATH/kernel-*.rpm
```
  Depending on how you got your kernel packages, the PKG_PATH should be ~build/kernel/rpmbuild/RPMS/x86_64 if you built the packages by yourself, or any other directory where you downloaded the packages from build.hpdd.intel.com.
2. Create initrd using dracut(*This may not be required because initrd should have been created by installing new kernel*)
```
# /sbin/new-kernel-pkg --package kernel --mkinitrd --dracut --depmod --install 2.6.32.431.5.1.el6_lustre
```
3. optional turn on lustre services, and specify net for lnet
```
* chkconfig lustre on 
* vi /etc/modprobe.d/lustre.conf
```
  If you don't know what should be written to this file, just leave it empty for now.
4. reboot
5. view the login prompt with satisfaction, and make sure that new kernel is running:
```
Red Hat Enterprise Linux Server release 6.0 (Santiago)
Kernel 2.6.32l-'I'm new kernel' on an x86_64

client-10 login:
```

Configure and build Lustre

Configure Lustre source

# cd ~/lustre-release/
# ./configure --with-linux=/lib/modules/kernel-2.6.32_lustremaster/build
...
...
LLCPPFLAGS:    -D__arch_lib__ -D_LARGEFILE64_SOURCE=1
CFLAGS:        -g -O2 -Werror
EXTRA_KCFLAGS: -include /home/build/lustre-release/config.h  -g -I/home/build/lustre-release/libcfs/include -I/home/build/lustre-release/lnet/include -I/home/build/lustre-release/lustre/include
LLCFLAGS:      -g -Wall -fPIC -D_GNU_SOURCE

Type 'make' to build Lustre.

make rpms:

# make rpms
...
...
Executing(%clean): /bin/sh -e /var/tmp/rpm-tmp.TsLWpD
+ umask 022
+ cd /home/build/kernel/rpmbuild/BUILD
+ cd lustre-2.0.61
+ rm -rf /home/build/kernel/rpmbuild/BUILDROOT/lustre-2.0.61-2.6.32_lustremaster_g0533e7b.x86_64
+ exit 0
make[1]: Leaving directory `/home/build/lustre-release'

You should now have build the following, similarly named, rpms:

# ls *.rpm
kernel-2.6.32lustremaster-1.x86_64.rpm
lustre-2.0.61-2.6.32.lustremaster_g0533e7b.x86_64.rpm
lustre-debuginfo-2.0.61-2.6.32.lustremaster_g0533e7b.x86_64.rpm
lustre-ldiskfs-3.3.0-2.6.32.lustremaster_g0533e7b.x86_64.rpm
lustre-ldiskfs-debuginfo-3.3.0-2.6.32.lustremaster_g0533e7b.x86_64.rpm
lustre-modules-2.0.61-2.6.32.lustremaster_g0533e7b.x86_64.rpm
lustre-source-2.0.61-2.6.32.lustremaster_g0533e7b.x86_64.rpm
lustre-tests-2.0.61-2.6.32.lustremaster_g0533e7b.x86_64.rpm

Installing e2fsprogs

e2fsprogs is needed to run the test suite.

Download e2fsprogs from http://downloads.hpdd.intel.com/public/e2fsprogs/latest/

Install with

# rpm -Uvh ./e2fsprogs-1.42.6.wc2-7.el6.x86_64.rpm  ./e2fsprogs-libs-1.42.6.wc2-7.el6.x86_64.rpm

Installing Lustre.

Change to root and Change directory into ~build/lustre-release/

Install modules lustre-modules and user space tools lustre-

# rpm -ivh lustre-ldiskfs-3.3.0-2.6.32.lustremaster*
# rpm -ivh lustre-modules-2.0.61-2.6.32.lustremaster*
# rpm -ivh lustre-2.0.61-2.6.32.lustremaster_*
# rpm -ivh lustre-tests-*

Disable SELinux (Lustre Servers)

SELinux, which is on by default in RHEL/CentOS, will prevent the format commands for the various Lustre targets from completing. Therefore you must either disable it or adjust the settings. These instructions explain how to disable it.

Run getenforce to see if SELinux is enabled. It should return 'Enforcing' or 'Disabled'.
To disable it, vi /etc/selinux/config and change the line 'selinux=enforcing' to 'selinux=disabled'.

Finally, reboot your system.

# vi /etc/selinux/config

----
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - No SELinux policy is loaded.
SELINUX=disabled
# SELINUXTYPE= can take one of these two values:
# targeted - Only targeted network daemons are protected.
# strict - Full SELinux protection.
SELINUXTYPE=targeted
---
# shutdown -r now

Testing

run /usr/lib64/lustre/tests/llmount.sh

# /usr/lib64/lustre/tests/llmount.sh
Loading modules from /usr/lib64/lustre/tests/..
debug=0x33f0404
subsystem_debug=0xffb7e3ff
gss/krb5 is not supported
Formatting mgs, mds, osts
Format mds1: /tmp/lustre-mdt1
Format ost1: /tmp/lustre-ost1
Format ost2: /tmp/lustre-ost2
Checking servers environments
Checking clients rhel6-master environments
Loading modules from /usr/lib64/lustre/tests/..
debug=0x33f0404
subsystem_debug=0xffb7e3ff
gss/krb5 is not supported
Setup mgs, mdt, osts
Starting mds1: -o loop,user_xattr,acl  /tmp/lustre-mdt1 /mnt/mds1
debug=0x33f0404
subsystem_debug=0xffb7e3ff
debug_mb=10
Started lustre-MDT0000
Starting ost1: -o loop  /tmp/lustre-ost1 /mnt/ost1
debug=0x33f0404
subsystem_debug=0xffb7e3ff
debug_mb=10
Started lustre-OST0000
Starting ost2: -o loop  /tmp/lustre-ost2 /mnt/ost2
debug=0x33f0404
subsystem_debug=0xffb7e3ff
debug_mb=10
Started lustre-OST0001
Starting client: rhel5-build: -o user_xattr,acl,flock rhel6-master@tcp:/lustre /mnt/lustre
debug=0x33f0404
subsystem_debug=0xffb7e3ff
debug_mb=10
Using TIMEOUT=20
disable quota as required

you will now have a Lustre filesystem available at /mnt/lustre
NOTE: if you receive an error: mkfs.lustre: Can't parse NID 'rhel6-master@tcp' you'll need to associate the IP address of a non-loopback interface with name of your machine into the /etc/hosts file.

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