Difference between revisions of "Installation"

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<code>criu</code> is an utility to checkpoint/restore a process tree. This page describes how to manually build and install prerequisites and the tool itself.
+
<code>criu</code> is an utility to checkpoint/restore a process tree. This page describes how to get CRIU binary on your box.
  
 
== Installing from packages ==
 
== Installing from packages ==
  
−
Some distributions provide ready-to-use [[packages]]. If no, or the CRIU version you want is not yet there, you will need to get CRIU sources and compile it.
+
Many distributions provide ready-to-use [[packages]]. If no, or the CRIU version you want is not yet there, you will need to get CRIU sources and compile it.
  
−
== Obtaining CRIU Source ==
+
== Obtaining CRIU sources ==
  
−
You can download the source code as a release tarball or sync the [https://github.com/xemul/criu git repository]. If you plan to modify CRIU sources the latter way is highly recommended.
+
You can download the source code as a [https://download.openvz.org/criu/ release tarball] or sync the [https://github.com/checkpoint-restore/criu git repository]. If you plan to modify CRIU sources (e.g. to [[How to submit patches|contribute the code back]]) the latter way is highly recommended. The latest and greatest sources are: {{Latest release}}
  
−
=== Getting source tarball ===
+
== Installing build dependencies ==
−
: {{Latest release}}
 
−
 
 
−
=== Cloning git repository ===
 
−
git clone https://github.com/xemul/criu
 
−
 
 
−
== Dependencies ==
 
  
 
=== Compiler and C Library ===
 
=== Compiler and C Library ===
  
−
CRIU is mostly written in C and the build system is based on Makefiles. Thus just install standard <code>gcc</code> and <code>make</code> packages (on Debian, <code>[https://packages.debian.org/build-essential build-essential]</code> will pull in both at once).
+
CRIU is mostly written in C and the build system is based on Makefiles. Thus just install standard <code>gcc</code> and <code>make</code> packages (on Debian use <code>[https://packages.debian.org/build-essential build-essential]</code>).
−
 
 
−
For building on x86 with compatible 32-bit applications C/R support you will need <code>libc6-dev-i386, gcc-multilib</code> instead of <code>gcc</code>.
 
  
−
If you are cross compiling for ARM, use distribution packages or download prebuilt toolchains from Linaro.
+
For building with [[32bit tasks C/R]] support you will need <code>libc6-dev-i386, gcc-multilib</code> instead of <code>gcc</code>.
  
−
<div class="toccolours mw-collapsible mw-collapsed" style="width:800px">
+
[[ARM crosscompile|Cross-compilation for ARM]] is also possible.
−
Downloading Linaro toolchains
 
−
<div class="mw-collapsible-content">
 
−
sudo apt-get install lib32stdc++6 lib32z1 # These are ia32 binaries
 
−
mkdir -p deps/`uname -m`-linux-gnu
 
−
cd deps
 
−
wget http://releases.linaro.org/14.09/components/toolchain/binaries/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux.tar.xz
 
−
tar --strip=1 -C `uname -m`-linux-gnu -xf gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux.tar.xz
 
−
wget http://releases.linaro.org/14.09/components/toolchain/binaries/gcc-linaro-aarch64-linux-gnu-4.9-2014.09_linux.tar.xz
 
−
tar --strip=1 -C `uname -m`-linux-gnu -xf gcc-linaro-aarch64-linux-gnu-4.9-2014.09_linux.tar.xz
 
−
cd ..
 
−
</div>
 
−
</div>
 
  
 
=== Protocol Buffers ===
 
=== Protocol Buffers ===
  
−
CRIU uses the [https://developers.google.com/protocol-buffers/ Google Protocol Buffers] to read and write [[images]] and thus requires [https://github.com/protobuf-c/protobuf-c C language bindings]. The <code>protoc</code> tool is required at build time and the <code>libprotobuf-c.so</code> shared object is required at build and run time. [[CRIT]] also uses python language bindings for protocol buffers and requires the <code>descriptor.proto</code> file typically provided by a distribution's protobuf development package.
+
CRIU uses the [https://developers.google.com/protocol-buffers/ Google Protocol Buffers] to read and write [[images]]. The <code>protoc</code> tool is used at build time and CRIU is linked with the <code>libprotobuf-c.so</code>. Also [[CRIT]] uses python bindings and the <code>descriptor.proto</code> file which typically provided by a distribution's protobuf development package.
  
−
==== Distribution Packages ====
+
; RPM packages
−
The easiest way is to install distribution packages.
+
: <code>protobuf protobuf-c protobuf-c-devel protobuf-compiler protobuf-devel protobuf-python </code>
  
−
* RPM package names
+
; Deb packages
−
** <code>group Development\ Tools</code>
+
: <code>libprotobuf-dev libprotobuf-c-dev protobuf-c-compiler protobuf-compiler python3-protobuf</code>
−
** <code>protobuf</code>
 
−
** <code>protobuf-c</code>
 
−
** <code>protobuf-c-devel</code>
 
−
** <code>protobuf-compiler</code>
 
−
** <code>protobuf-devel</code>
 
−
** <code>protobuf-python</code>
 
−
** <code>libnet-devel</code>
 
−
* Debian package names
 
−
** <code>build-essential</code>
 
−
** <code>libprotobuf-dev</code>
 
−
** <code>libprotobuf-c0-dev</code>
 
−
** <code>protobuf-c-compiler</code>
 
−
** <code>protobuf-compiler</code>
 
−
** <code>python-protobuf</code>
 
−
** <code>libnet1-dev</code>
 
−
* Ubuntu
 
−
** The below will get your freshly installed Ubuntu host ready to compile criu. "--no-install-recommends" parameter is to avoid asciidoc pulling in a lot of dependencies.
 
−
** sudo apt-get install --no-install-recommends git build-essential libprotobuf-dev libprotobuf-c0-dev protobuf-c-compiler protobuf-compiler python-protobuf libnl-3-dev libpth-dev pkg-config libcap-dev asciidoc libnet
 
  
−
==== Building Protocol Buffers From Source ====
+
Optionally, you may [[build protobuf]] from sources.
−
If you would like to build from source, you can use the following commands to obtain the source code repositories, configure, and build the code. On a Debian based system, you may have to install <code>autoconf curl g++ libtool</code> packages first.
 
  
−
<div class="toccolours mw-collapsible mw-collapsed" style="width:800px">
+
=== Other stuff ===
−
To build protobuf
 
−
<div class="mw-collapsible-content">
 
−
cd deps
 
−
git clone https://github.com/google/protobuf.git protobuf
 
−
cd protobuf
 
−
./autogen.sh
 
−
./configure --prefix=`pwd`/../`uname -m`-linux-gnu
 
−
make
 
−
make install
 
−
cd ../..
 
−
</div>
 
−
</div>
 
  
−
<div class="toccolours mw-collapsible mw-collapsed" style="width:800px">
 
−
To build protobuf-c
 
−
<div class="mw-collapsible-content">
 
−
cd deps
 
−
git clone https://github.com/protobuf-c/protobuf-c.git protobuf-c
 
−
cd protobuf-c
 
−
./autogen.sh
 
−
mkdir ../pbc-`uname -m`
 
−
cd ../pbc-`uname -m`
 
−
../protobuf-c/configure --prefix=`pwd`/../`uname -m`-linux-gnu \
 
−
  PKG_CONFIG_PATH=`pwd`/../`uname -m`-linux-gnu/lib/pkgconfig
 
−
make
 
−
make install
 
−
cd ../..
 
−
</div>
 
−
</div>
 
−
 
−
<div class="toccolours mw-collapsible mw-collapsed" style="width:800px">
 
−
To cross-compile for ARM some more tricks will be required.
 
−
<div class="mw-collapsible-content">
 
−
For ARMv7
 
−
 
−
cd deps
 
−
mkdir -p pbc-arm
 
−
cd pbc-arm
 
−
../protobuf-c/configure --host=arm-linux-gnueabihf --prefix=`pwd`/../arm-linux-gnueabihf \
 
−
                        --disable-protoc PATH=`pwd`/../`uname -m`-linux-gnu/bin:$PATH
 
−
make PATH=`pwd`/../`uname -m`-linux-gnu/bin:$PATH
 
−
make install PATH=`pwd`/../`uname -m`-linux-gnu/bin:$PATH
 
−
cd ../..
 
−
 
−
For ARM8
 
−
 
−
cd deps
 
−
mkdir -p pbc-aarch64
 
−
cd pbc-aarch64
 
−
  ../protobuf-c/configure --host=aarch64-linux-gnu --prefix=`pwd`/../aarch64-linux-gnu \
 
−
                          --disable-protoc PATH=`pwd`/../`uname -m`-linux-gnu/bin:$PATH
 
−
make PATH=`pwd`/../`uname -m`-linux-gnu/bin:$PATH
 
−
make install PATH=`pwd`/../`uname -m`-linux-gnu/bin:$PATH
 
−
cd ../..
 
−
</div>
 
−
</div>
 
−
 
−
=== Other deps ===
 
 
* <code>pkg-config</code> to check on build library dependencies.
 
* <code>pkg-config</code> to check on build library dependencies.
−
* <code>libnl3</code> and <code>libnl3-devel</code> (RPM distros) or <code>libnl-3-dev</code> (DEB distros) for network operations.
+
* <code>python-ipaddress</code> is used by CRIT to pretty-print IP addresses and is also required by zdtm.py
−
* <code>python-ipaddr</code> is used by CRIT to pretty-print ip.
+
* <code>libbsd-devel</code> (RPM) / <code>libbsd-dev</code> (DEB) If available, CRIU will be compiled with <code>setproctitle()</code> support and set verbose process titles on service workers.
−
* If <code>libbsd</code> available, CRIU will be compiled with setproctitle() support. It will allow to make process titles of service workers to be more verbose.
+
* <code>iproute2</code> version 3.5.0 or higher is needed for dumping network namespaces. The latest one can be cloned from [http://git.kernel.org/?p=linux/kernel/git/shemminger/iproute2.git;a=summary iproute2]. It should be compiled and a path to ip set as the [[environment variables|<code>CR_IP_TOOL</code> variable]]
−
* The iproute2 tool version 3.5.0 or higher is needed for dumping network namespaces. The latest one can be cloned from [http://git.kernel.org/?p=linux/kernel/git/shemminger/iproute2.git;a=summary iproute2]. It should be compiled and a path to ip written in the environment variable <code>CR_IP_TOOL</code>.
+
* <code>nftables</code> (RPM) / <code>libnftables-dev</code> (DEB) If available, CRIU will be compiled with nftables C/R support
−
* <code>libcap-devel</code> (RPM) or <code>libcap-dev</code> (DEB)
+
* <code>libcap-devel</code> (RPM) / <code>libcap-dev</code> (DEB) - Require
−
* If you would like to use <code>make test</code> you should install <code>libaio-devel</code> (RPM) or <code>libaio-dev</code> (DEB).
+
* <code>libnet-devel libnl3-devel</code> (RPM) / <code>libnet1-dev</code> (DEB) / <code>libnl-3-dev libnet-dev</code> (Ubuntu) - Require
−
* For test launcher <code>zdtm.py</code> you need <code>PyYAML</code> (RPM) or <code>python-yaml</code> (DEB).
+
* <code>libaio-devel</code> (RPM) / <code>libaio-dev</code> (DEB) is needed to run tests
−
 
+
* <code>gnutls-devel</code> (RPM) / <code>libgnutls28-dev</code> (DEB), if available, CRIU will be compiled with [[TLS]] support
−
== Linux Kernel ==
+
* <code>python2-future</code> or <code>python3-future</code> is now needed for zdtm.py tests launcher
−
 
+
* <code>libdrm-devel</code> (RPM) / <code>libdrm-dev</code> (DEB) If available, CRIU will be compiled with support for AMD GPUs.
−
Linux kernel v3.11 or newer is required, with some specific options set. If your distribution does not provide needed kernel, you might want to compile one yourself.
 
−
 
 
−
=== Configuring the kernel ===
 
−
 
 
−
Most likely the first thing to enable is the <code>CONFIG_EXPERT=y</code> (General setup -> Configure standard kernel features (expert users)) option, which on x86_64 depends on the <code>CONFIG_EMBEDDED=y</code> (General setup -> Embedded system) one (welcome to Kconfig reverse chains hell).
 
−
 
 
−
The following options must be enabled for CRIU to work:
 
−
 
 
−
* ''General setup'' options
 
−
** <code>CONFIG_CHECKPOINT_RESTORE=y</code> (Checkpoint/restore support)
 
−
** <code>CONFIG_NAMESPACES=y</code> (Namespaces support)
 
−
** <code>CONFIG_UTS_NS=y</code> (Namespaces support -> UTS namespace)
 
−
** <code>CONFIG_IPC_NS=y</code> (Namespaces support -> IPC namespace)
 
−
** <code>CONFIG_PID_NS=y</code> (Namespaces support -> PID namespaces)
 
−
** <code>CONFIG_NET_NS=y</code> (Namespaces support -> Network namespace)
 
−
** <code>CONFIG_FHANDLE=y</code> (Open by fhandle syscalls)
 
−
** <code>CONFIG_EVENTFD=y</code> (Enable eventfd() system call)
 
−
** <code>CONFIG_EPOLL=y</code> (Enable eventpoll support)
 
−
* ''Networking support -> Networking options'' options for sock-diag subsystem
 
−
** <code>CONFIG_UNIX_DIAG=y</code> (Unix domain sockets -> UNIX: socket monitoring interface)
 
−
** <code>CONFIG_INET_DIAG=y</code> (TCP/IP networking -> INET: socket monitoring interface)
 
−
** <code>CONFIG_INET_UDP_DIAG=y</code> (TCP/IP networking -> INET: socket monitoring interface -> UDP: socket monitoring interface)
 
−
** <code>CONFIG_PACKET_DIAG=y</code> (Packet socket -> Packet: sockets monitoring interface)
 
−
** <code>CONFIG_NETLINK_DIAG=y</code> (Netlink socket -> Netlink: sockets monitoring interface)
 
−
 
 
−
Other options not required by CRIU, but C/R supported ([[ZDTM test suite]] may fail without them):
 
−
* <code>CONFIG_INOTIFY_USER=y</code> (File systems -> Inotify support for userspace)
 
−
* <code>CONFIG_FANOTIFY=y</code> (File systems -> Filesystem wide access notification)
 
−
* <code>CONFIG_MEMCG=y</code> (General setup -> Control Group support -> Memory controller)
 
−
* <code>CONFIG_CGROUP_DEVICE=y</code> (General setup -> Control Group support -> Device controller)
 
−
* <code>CONFIG_MACVLAN=y</code> (Device Drivers -> Network device support -> Network core driver support -> MAC-VLAN support)
 
−
* <code>CONFIG_BRIDGE=y</code> (Networking support -> Networking options -> 802.1d Ethernet Bridging)
 
−
* <code>CONFIG_BINFMT_MISC=y</code> (Userspace binary formats -> Kernel support for MISC binaries)
 
−
* <code>CONFIG_IA32_EMULATION=y</code> (x86 only) (Executable file formats -> Emulations -> IA32 Emulation)
 
−
 
 
−
For some [[usage scenarios]] there is an ability to track memory changes and produce [[incremental dumps]]. Need to enable the <code>CONFIG_MEM_SOFT_DIRTY=y</code> (optional) (Processor type and features -> Track memory changes).
 
  
−
Note we also have our [[custom kernel]], which might contain some experimental CRIU related patches.
+
For APT use the <code>--no-install-recommends</code> parameter is to avoid asciidoc pulling in a lot of dependencies.
 +
Also read about [[ZDTM test suite]] if you will run CRIU tests, those sources need other deps.
  
−
== Building CRIU From Source ==
+
== Building the tool ==
  
−
=== Native Compilation ===
+
Simply run <code>make</code> in the CRIU source directory. This is the standard way, but there are some options available.
−
Simply run <code>make</code> in the CRIU source directory.
 
  
−
=== Compilation in Docker container ===
+
# There's a ''docker-build'' target in Makefile which builds CRIU in Ubuntu Docker container. Just run <code>make docker-build</code> and that's it.
 +
# CRIU has functionality that is either optional or behaves differently depending on the kernel CRIU is running on. By default build process includes maximum of it, but this behavior [[configuring|can be changed]].
 +
# You may [[Manual build deps|specify build dependencies by hands]]
  
−
There's a ''docker-build'' target in Makefile which builds CRIU in Ubuntu Docker container. Just run <code>make docker-build</code> and that's it.
+
== Installing ==
  
−
=== Non-standard compilation ===
+
CRIU works perfectly even when run from the sources directory (with the <code>./criu/criu</code> command), but if you want to have in standard paths run <code>make install</code>. You may need to install <code>asciidoc</code> and <code>xmlto</code> packages to make install-man work.
−
 
 
−
<div class="toccolours mw-collapsible mw-collapsed" style="width:800px">
 
−
Building natively, but specifying built dependencies manually
 
−
<div class="mw-collapsible-content">
 
−
cd deps
 
−
rsync -a --exclude=.git --exclude=deps .. criu-`uname -m`
 
−
cd criu-`uname -m`
 
−
make \
 
−
  USERCFLAGS="-I`pwd`/../`uname -m`-linux-gnu/include -L`pwd`/../`uname -m`-linux-gnu/lib" \
 
−
  PATH="`pwd`/../`uname -m`-linux-gnu/bin:$PATH"
 
−
sudo LD_LIBRARY_PATH=`pwd`/../`uname -m`-linux-gnu/lib ./criu check
 
−
cd ../..
 
−
</div>
 
−
</div>
 
−
 
 
−
<div class="toccolours mw-collapsible mw-collapsed" style="width:800px">
 
−
Cross Compilation for ARM
 
−
<div class="mw-collapsible-content">
 
−
ARMv7
 
−
cd deps
 
−
rsync -a --exclude=.git --exclude=deps .. criu-arm
 
−
cd criu-arm
 
−
make \
 
−
  ARCH=arm \
 
−
  CROSS_COMPILE=`pwd`/../`uname -m`-linux-gnu/bin/arm-linux-gnueabihf- \
 
−
  USERCFLAGS="-I`pwd`/../arm-linux-gnueabihf/include -L`pwd`/../arm-linux-gnueabihf/lib" \
 
−
  PATH="`pwd`/../`uname -m`-linux-gnu/bin:$PATH"
 
−
cd ../..
 
−
 
 
−
ARMv8
 
−
  cd deps
 
−
  rsync -a --exclude=.git --exclude=deps .. criu-aarch64
 
−
  cd criu-aarch64
 
−
  make \
 
−
  ARCH=aarch64 \
 
−
  CROSS_COMPILE=`pwd`/../`uname -m`-linux-gnu/bin/aarch64-linux-gnu- \
 
−
  USERCFLAGS="-I`pwd`/../aarch64-linux-gnu/include -L`pwd`/../aarch64-linux-gnu/lib" \
 
−
  PATH="`pwd`/../`uname -m`-linux-gnu/bin:$PATH"
 
−
  cd ../..
 
−
</div>
 
−
</div>
 
−
 
 
−
=== Configuration ===
 
−
 
 
−
CRIU has functionality that is either optional or behaves differently depending on the kernel CRIU is running on. By default build process includes maximum of it, but this behavior can be changed.
 
−
 
 
−
''Main article: [[Configuring]]''
 
−
 
 
−
== Installation ==
 
−
CRIU works perfectly even when run from the sources directory (with the "./criu" command), but if you want to have in standard paths run <code>make install</code>.
 
−
 
 
−
You may need to install the following packages to generate docs in Debian-based OS's to avoid errors from install-man:
 
−
* <code>asciidoc</code>
 
−
* <code>xmlto</code>
 
  
 
== Checking That It Works ==
 
== Checking That It Works ==
  
−
First thing to do is to run <code>criu check</code>. At the end it should say "Looks OK", if it doesn't the messages on the screen explain what functionality is missing.  
+
Linux kernel v3.11 or newer is required, with some specific config options turned on. Various advanced CRIU features might require even newer kernel.  So the first thing to do is to [[Checking the kernel|check the kernel]] by running <code>criu check</code>. At the end it should say "Looks OK", if it doesn't the messages on the screen explain what functionality is missing. If your distribution does not provide needed kernel, you might want to [[Linux kernel|compile one yourself]].
−
 
 
−
Some kernel functionality is required in rare cases and may not block the dump (but sometimes may). These features can be checked by adding the <code>--extra</code> flag.
 
−
 
 
−
If you're using our custom kernel, then the <code>--all</code> option can be used, in this case CRIU would check for ''all'' the kernel features to work.
 
  
−
You can then try running the [[ZDTM Test Suite]] which sits in the <code>tests/zdtm/</code> directory.
+
You can then try running the [[ZDTM Test Suite]] which sits in the <code>test/zdtm/</code> directory.
  
 
== Further reading ==
 
== Further reading ==
  
−
* [[Checking the kernel]]
 
 
* [[Usage]]
 
* [[Usage]]
 
* [[Advanced usage]]
 
* [[Advanced usage]]
Line 262: Line 73:
  
 
[[Category:HOWTO]]
 
[[Category:HOWTO]]
 +
[[Category:Editor help needed]]

Latest revision as of 01:56, 30 September 2023

criu is an utility to checkpoint/restore a process tree. This page describes how to get CRIU binary on your box.

Installing from packages[edit]

Many distributions provide ready-to-use packages. If no, or the CRIU version you want is not yet there, you will need to get CRIU sources and compile it.

Obtaining CRIU sources[edit]

You can download the source code as a release tarball or sync the git repository. If you plan to modify CRIU sources (e.g. to contribute the code back) the latter way is highly recommended. The latest and greatest sources are:

Tarball: criu-3.19.tar.gz
Version: 3.19 "Bronze Peacock"
Released: 27 Nov 2023
GIT tag: v3.19

Installing build dependencies[edit]

Compiler and C Library[edit]

CRIU is mostly written in C and the build system is based on Makefiles. Thus just install standard gcc and make packages (on Debian use build-essential).

For building with 32bit tasks C/R support you will need libc6-dev-i386, gcc-multilib instead of gcc.

Cross-compilation for ARM is also possible.

Protocol Buffers[edit]

CRIU uses the Google Protocol Buffers to read and write images. The protoc tool is used at build time and CRIU is linked with the libprotobuf-c.so. Also CRIT uses python bindings and the descriptor.proto file which typically provided by a distribution's protobuf development package.

RPM packages
protobuf protobuf-c protobuf-c-devel protobuf-compiler protobuf-devel protobuf-python
Deb packages
libprotobuf-dev libprotobuf-c-dev protobuf-c-compiler protobuf-compiler python3-protobuf

Optionally, you may build protobuf from sources.

Other stuff[edit]

  • pkg-config to check on build library dependencies.
  • python-ipaddress is used by CRIT to pretty-print IP addresses and is also required by zdtm.py
  • libbsd-devel (RPM) / libbsd-dev (DEB) If available, CRIU will be compiled with setproctitle() support and set verbose process titles on service workers.
  • iproute2 version 3.5.0 or higher is needed for dumping network namespaces. The latest one can be cloned from iproute2. It should be compiled and a path to ip set as the CR_IP_TOOL variable
  • nftables (RPM) / libnftables-dev (DEB) If available, CRIU will be compiled with nftables C/R support
  • libcap-devel (RPM) / libcap-dev (DEB) - Require
  • libnet-devel libnl3-devel (RPM) / libnet1-dev (DEB) / libnl-3-dev libnet-dev (Ubuntu) - Require
  • libaio-devel (RPM) / libaio-dev (DEB) is needed to run tests
  • gnutls-devel (RPM) / libgnutls28-dev (DEB), if available, CRIU will be compiled with TLS support
  • python2-future or python3-future is now needed for zdtm.py tests launcher
  • libdrm-devel (RPM) / libdrm-dev (DEB) If available, CRIU will be compiled with support for AMD GPUs.

For APT use the --no-install-recommends parameter is to avoid asciidoc pulling in a lot of dependencies. Also read about ZDTM test suite if you will run CRIU tests, those sources need other deps.

Building the tool[edit]

Simply run make in the CRIU source directory. This is the standard way, but there are some options available.

  1. There's a docker-build target in Makefile which builds CRIU in Ubuntu Docker container. Just run make docker-build and that's it.
  2. CRIU has functionality that is either optional or behaves differently depending on the kernel CRIU is running on. By default build process includes maximum of it, but this behavior can be changed.
  3. You may specify build dependencies by hands

Installing[edit]

CRIU works perfectly even when run from the sources directory (with the ./criu/criu command), but if you want to have in standard paths run make install. You may need to install asciidoc and xmlto packages to make install-man work.

Checking That It Works[edit]

Linux kernel v3.11 or newer is required, with some specific config options turned on. Various advanced CRIU features might require even newer kernel. So the first thing to do is to check the kernel by running criu check. At the end it should say "Looks OK", if it doesn't the messages on the screen explain what functionality is missing. If your distribution does not provide needed kernel, you might want to compile one yourself.

You can then try running the ZDTM Test Suite which sits in the test/zdtm/ directory.

Further reading[edit]

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