CRIU

Installation

Revision as of 13:02, 12 July 2017 by Xemul (talk | contribs) (→‎Obtaining CRIU Source)

criu is an utility to checkpoint/restore a process tree. This page describes how to manually build and install prerequisites and the tool itself.

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.

Obtaining CRIU Source

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-4.0.tar.gz
Version: 4.0 "CRIUDA"
Released: 20 Sep 2024
GIT tag: v4.0

Dependencies

Compiler and C Library

CRIU is mostly written in C and the build system is based on Makefiles. Thus just install standard gcc and make packages (on Debian, build-essential will pull in both at once).

For building on x86 with compatible 32-bit applications C/R support you will need libc6-dev-i386, gcc-multilib instead of gcc.

If you are cross compiling for ARM, use distribution packages or download prebuilt toolchains from Linaro.

Downloading Linaro toolchains 

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 ..

Protocol Buffers

CRIU uses the Google Protocol Buffers to read and write images and thus requires C language bindings. The protoc tool is required at build time and the libprotobuf-c.so shared object is required at build and run time. CRIT also uses python language bindings for protocol buffers and requires the descriptor.proto file typically provided by a distribution's protobuf development package.

Distribution Packages

The easiest way is to install distribution packages.

  • RPM package names
    • group Development\ Tools
    • protobuf
    • protobuf-c
    • protobuf-c-devel
    • protobuf-compiler
    • protobuf-devel
    • protobuf-python
    • libnet-devel
    • libnl3-devel
    • asciidoc (for make install)
    • xmlto (for make install)
  • Debian package names
    • build-essential
    • libprotobuf-dev
    • libprotobuf-c0-dev
    • protobuf-c-compiler
    • protobuf-compiler
    • python-protobuf
    • libnet1-dev
  • 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 xmlto libnet-dev

Optionally, you may build protobuf from sources.

Other deps

  • pkg-config to check on build library dependencies.
  • libnl3 and libnl3-devel (RPM distros) or libnl-3-dev (DEB distros) for network operations.
  • python-ipaddr is used by CRIT to pretty-print ip.
  • If libbsd available, CRIU will be compiled with setproctitle() support. It will allow to make process titles of service workers to be more verbose.
  • The iproute2 tool 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 written in the environment variable CR_IP_TOOL.
  • libcap-devel (RPM) or libcap-dev (DEB)
  • If you would like to use make test you should install libaio-devel (RPM) or libaio-dev (DEB).
  • For test launcher zdtm.py you need PyYAML (RPM) or python-yaml (DEB).

Linux Kernel

Linux kernel v3.11 or newer is required, with some specific options set. Various CRIU features might require even newer kernel. If your distribution does not provide needed kernel, you might want to compile one yourself. Criu can check the kernel features presence.

Building CRIU From Source

Native Compilation

Simply run make 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 make docker-build and that's it.

Non-standard compilation

Building natively, but specifying built dependencies manually 

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 ../..

Cross Compilation for ARM

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 ../..

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 make install.

You may need to install the following packages to generate docs in Debian-based OS's to avoid errors from install-man:

  • asciidoc
  • xmlto

Checking That It Works

First thing to do is to run criu check. At the end it should say "Looks OK", if it doesn't the messages on the screen explain what functionality is missing.

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 --extra flag.

If you're using our custom kernel, then the --all 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 tests/zdtm/ directory.

Further reading

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