Difference between revisions of "Installation"

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<code>criu</code> is an utility to checkpoint/restore a process tree. This page describes manual installation.
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<code>criu</code> is an utility to checkpoint/restore a process tree. This page describes how to get CRIU binary on your box.
  
{{Note|Most probably you don't need manual installation, but rather [[Packages]] for your distro.}}
+
== Installing from packages ==
  
== Tools installation ==
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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.
  
Get the latest release:
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== Obtaining CRIU sources ==
{{Out|{{Latest release}}}}
 
  
Alternatively, use [http://git.criu.org/?p=criu.git;a=summary git.criu.org] git repository. Clone this repo to test new functionality.
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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}}
  
Before building, make sure you have C bindings for Google's Protocol Buffers installed. In an RPM-based world this is the <code>protobuf-c-devel</code> package, and on Debian and derivatives, <code>libprotobuf-c0-dev</code>.
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== Installing build dependencies ==
If for some reason there is no appropriate package for your system available, just install Google's Protocol Buffer from the
 
source tarball. The protocol buffer library can be found at http://code.google.com/p/protobuf/, while
 
protocol buffer C binding can be found at http://code.google.com/p/protobuf-c/.
 
  
Then run <code>make</code> in the sources root. Please note that the tool only supports x86_64 and ARM architectures.
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=== Compiler and C Library ===
  
== Kernel configuration ==
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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>).
  
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. Note we also have our [[custom kernel]], which might contain some experimental CRIU related patches.
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For building with [[32bit tasks C/R]] support you will need <code>libc6-dev-i386, gcc-multilib</code> instead of <code>gcc</code>.
  
Note you might have to enable
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[[ARM crosscompile|Cross-compilation for ARM]] is also possible.
; <code>CONFIG_EXPERT</code>
 
: General setup -> Configure standard kernel features (expert users)
 
option, which depends on
 
; <code>CONFIG_EMBEDDED</code>
 
: General setup -> Embedded system
 
(welcome to Kconfig reverse chains hell).
 
  
The following options should be enabled for CRIU to work:
+
=== Protocol Buffers ===
  
; <code>CONFIG_CHECKPOINT_RESTORE</code>
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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.
: General setup -> Checkpoint/restore support
 
  
; <code>CONFIG_NAMESPACES</code>
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; RPM packages
: General setup -> Namespaces support
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: <code>protobuf protobuf-c protobuf-c-devel protobuf-compiler protobuf-devel protobuf-python</code>
  
; <code>CONFIG_UTS_NS</code>
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; Deb packages
: General setup -> Namespaces support -> UTS namespace
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: <code>libprotobuf-dev libprotobuf-c-dev protobuf-c-compiler protobuf-compiler python-protobuf</code>
  
; <code>CONFIG_IPC_NS</code>
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Optionally, you may [[build protobuf]] from sources.
: General setup -> Namespaces support -> IPC namespace
 
  
; <code>CONFIG_PID_NS</code>
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=== Other stuff ===
: General setup -> Namespaces support -> PID namespaces
 
  
; <code>CONFIG_NET_NS</code>
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* <code>pkg-config</code> to check on build library dependencies.
: General setup -> Namespaces support -> Network namespace
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* <code>python-ipaddress</code> is used by CRIT to pretty-print IP addresses and is also required by zdtm.py
 +
* <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.
 +
* <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]]
 +
* <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) / <code>libcap-dev</code> (DEB)
 +
* <code>libnet-devel libnl3-devel</code> (RPM) / <code>libnet1-dev</code> (DEB) / <code>libnl-3-dev libnet-dev</code> (Ubuntu)
 +
* <code>libaio-devel</code> (RPM) / <code>libaio-dev</code> (DEB) is needed to run tests
 +
* <code>python2-future</code> or <code>python3-future</code> is now needed for zdtm.py tests launcher
  
; <code>CONFIG_FHANDLE</code>
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For APT use the <code>--no-install-recommends</code> parameter is to avoid asciidoc pulling in a lot of dependencies.
: General setup -> open by fhandle syscalls
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Also read about [[ZDTM test suite]] if you will run CRIU tests, those sources need other deps.
  
; <code>CONFIG_EVENTFD</code>
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== Building the tool ==
: General setup -> Enable eventfd() system call
 
  
; <code>CONFIG_EPOLL</code>
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Simply run <code>make</code> in the CRIU source directory. This is the standard way, but there are some options available.
: General setup -> Enable eventpoll support
 
  
; <code>CONFIG_INOTIFY_USER</code>
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# 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.
: File systems -> Inotify support for userspace
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# 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]]
  
; <code>CONFIG_IA32_EMULATION</code>
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== Installing ==
: Executable file formats -> Emulations -> IA32 Emulation
 
  
; <code>CONFIG_UNIX_DIAG</code>
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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.
: Networking support -> Networking options -> Unix domain sockets -> UNIX: socket monitoring interface
 
  
; <code>CONFIG_INET_DIAG</code>
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== Checking That It Works ==
: Networking support -> Networking options -> TCP/IP networking -> INET: socket monitoring interface
 
  
; <code>CONFIG_INET_UDP_DIAG</code>
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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]].
: Networking support -> Networking options -> TCP/IP networking -> INET: socket monitoring interface -> UDP: socket monitoring interface
 
 
 
; <code>CONFIG_PACKET_DIAG</code>
 
: Networking support -> Networking options -> Packet socket -> Packet: sockets monitoring interface
 
 
 
; <code>CONFIG_NETLINK_DIAG</code>
 
: Networking support -> Networking options -> Netlink socket -> Netlink: sockets monitoring interface
 
 
 
For some [[usage scenarios]] there is an ability to track memory changes and produce [[incremental dumps]]. Need to enable
 
; <code>CONFIG_MEM_SOFT_DIRTY</code>
 
: Processor type and features -> Track memory changes
 
 
 
==iproute2==
 
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>.
 
 
 
== Checking how it works ==
 
 
 
First thing to do is to run
 
 
 
<pre>
 
# criu check --ms
 
</pre>
 
 
 
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 <code>--ms</code> 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 <code>tests/zdtm/</code> directory.
 
You can then try running the [[ZDTM Test Suite]] which sits in the <code>tests/zdtm/</code> directory.
  
{{Out|There's a known issue with BTRFS spoiling dev_t values for files and sockets! Not all tests will work on it.}}
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== Further reading ==
  
== Using CR tools ==
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* [[Usage]]
 +
* [[Advanced usage]]
 +
* [[:Category:HOWTO]]
  
Please see [[Usage]] and [[Advanced usage]], as well as [[:Category:HOWTO]].
+
[[Category:HOWTO]]
 +
[[Category:Editor help needed]]

Latest revision as of 05:52, 24 December 2020

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-3.15.tar.bz2
Version: 3.15 "Titanium Falcon"
Released: 03 Nov 2020
GIT tag: v3.15

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 python-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)
  • libnet-devel libnl3-devel (RPM) / libnet1-dev (DEB) / libnl-3-dev libnet-dev (Ubuntu)
  • libaio-devel (RPM) / libaio-dev (DEB) is needed to run tests
  • python2-future or python3-future is now needed for zdtm.py tests launcher

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 tests/zdtm/ directory.

Further reading[edit]