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docs: update INSTALL.md with a section about building CRIU

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The building section also contains the information how to change the
network locking backend without source code changes.

Signed-off-by: Adrian Reber <areber@redhat.com>
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Adrian Reber 2025-02-04 15:56:27 +00:00 committed by Andrei Vagin
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INSTALL.md
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## Building CRIU from source code
First, you need to install compile-time dependencies. Check [Installation dependencies](https://criu.org/Installation#Dependencies) for more info.
To compile CRIU, run:
```
make
```
This should create the `./criu/criu` executable.
To change the default behaviour of CRIU, the following variables can be passed
to the make command:
* **NETWORK_LOCK_DEFAULT**, can be set to one of the following
values: `NETWORK_LOCK_IPTABLES`, `NETWORK_LOCK_NFTABLES`,
`NETWORK_LOCK_SKIP`. CRIU defaults to `NETWORK_LOCK_IPTABLES`
if nothing is specified. If another network locking backend is
needed, `make` can be called like this:
`make NETWORK_LOCK_DEFAULT=NETWORK_LOCK_NFTABLES`
## Installing CRIU from source code
Once CRIU is built one can easily setup the complete CRIU package