Installation
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 the latter way is highly recommended.
Getting source tarball
Tarball: | criu-4.0.tar.gz |
Version: | 4.0 "CRIUDA" |
Released: | 20 Sep 2024 |
GIT tag: | v4.0 |
Cloning git repository
git clone https://github.com/xemul/criu
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
sets.
Some additional steps are required if you're using Debian.
- For native compilation on Debian based systems, install the
build-essential
package. - On a modern Debian based x86_64 you will need to install the
lib32stdc++6
andlib32z1
packages.
For cross compiling for ARM and AArch64, the Linaro prebuilt toolchains are a good choice. Installing them is described below. They are ia32 architecture 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
is required at build and run time. CRIT also uses python language bindings for protocol buffers and requires the descriptor.proto
file from devel set that can be typically found in the protobuf-devel
package.
Distribution Packages
The easiest way is to install distribution packages.
- RPM package names
protobuf
protobuf-c
protobuf-python
protobuf-compiler
protobuf-devel
protobuf-c-devel
- Debian package names
protobuf-c-compiler
libprotobuf-c0-dev
protobuf-compiler
protobuf-python
Building Protocol Buffers From Source
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 do autoconf curl g++ libtool
first.
To build protobuf
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 ../..
To build protobuf-c
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 ../..
To cross-compile for ARM some more tricks will be required.
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 ../..
Other deps
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
.
Linux Kernel
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 CONFIG_EXPERT=y
(General setup -> Configure standard kernel features (expert users)) option, which on x86_64 depends on the CONFIG_EMBEDDED=y
(General setup -> Embedded system) one (welcome to Kconfig reverse chains hell).
The following options must be enabled for CRIU to work:
- General setup options
CONFIG_CHECKPOINT_RESTORE=y
(Checkpoint/restore support)CONFIG_NAMESPACES=y
(Namespaces support)CONFIG_UTS_NS=y
(Namespaces support -> UTS namespace)CONFIG_IPC_NS=y
(Namespaces support -> IPC namespace)CONFIG_PID_NS=y
(Namespaces support -> PID namespaces)CONFIG_NET_NS=y
(Namespaces support -> Network namespace)CONFIG_FHANDLE=y
(Open by fhandle syscalls)CONFIG_EVENTFD=y
(Enable eventfd() system call)CONFIG_EPOLL=y
(Enable eventpoll support)
- Networking support -> Networking options options for sock-diag subsystem
CONFIG_UNIX_DIAG=y
(Unix domain sockets -> UNIX: socket monitoring interface)CONFIG_INET_DIAG=y
(TCP/IP networking -> INET: socket monitoring interface)CONFIG_INET_UDP_DIAG=y
(TCP/IP networking -> INET: socket monitoring interface -> UDP: socket monitoring interface)CONFIG_PACKET_DIAG=y
(Packet socket -> Packet: sockets monitoring interface)CONFIG_NETLINK_DIAG=y
(Netlink socket -> Netlink: sockets monitoring interface)
- Other options
CONFIG_INOTIFY_USER=y
(File systems -> Inotify support for userspace)CONFIG_IA32_EMULATION=y
(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 CONFIG_MEM_SOFT_DIRTY=y
(optional) (Processor type and features -> Track memory changes).
Note we also have our custom kernel, which might contain some experimental CRIU related patches.
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.
Compilation with non-standard paths to dependencies
Here is an example of building natively specifying manually built dependencies.
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 ../..
ARMv7
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 ../..
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
Checking That It Works
First thing to do is to run criu check --ms
.
At the end it should say "Looks OK", if it doesn't the messages on the screen explain what functionality is missing. If you're using our custom kernel, then the --ms
option should not 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
Please see Usage and Advanced usage, as well as Category:HOWTO.