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89 lines
2.9 KiB
89 lines
2.9 KiB
Let all the files in the system tarball sit in a directory served by NFS (the
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NFS root) like this in exportfs:
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/home/pcroot 192.168.1.0/24(rw,no_root_squash,no_all_squash)
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Run "exportfs -a" after editing /etc/exportfs, for the nfs server to be aware
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of the changes.
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Use a tftp server serving the root of boot/ (from the system tarball).
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In order to have PXE boot, use the boot/dhcpd.conf-example file for your dhcpd
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server, as it will point your PXE clients to pxelinux.0 from the tftp server.
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Adapt the configuration to your network.
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Adapt the pxelinux configuration (boot/pxelinux.cfg/default) to set the path to
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your nfrroot. If you use ip=dhcp in the kernel, the nfs server ip will be taken
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from dhcp and so you don't have to specify it.
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The linux in bzImage includes network drivers for some usual cards.
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QEMU Testing
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---------------
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You can test qemu pxe boot without having a DHCP server adapted, but having
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nfsroot, like this:
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qemu-system-x86_64 -tftp /home/pcroot/boot -net nic -net user,bootfile=pxelinux.0 -boot n
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I don't know how to use NFS through the qemu '-net user' though.
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QEMU Testing with NFS root and bridged network
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-------------------------------------------------
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This allows testing with qemu as any other host in your LAN.
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Testing with the real dhcpd server requires setting up a bridge and having a
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tap device.
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tunctl -t tap0
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brctl addbr br0
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brctl addif br0 eth0
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brctl addif tap0 eth0
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ifconfig eth0 0.0.0.0 up
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ifconfig tap0 0.0.0.0 up
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ifconfig br0 up # With your ip configuration
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Then you can run qemu:
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qemu-system-x86_64 -boot n -net tap,ifname=tap0,script=no -net nic,model=e1000
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Using the system-tarball-pc in a chroot
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--------------------------------------------------
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Installation:
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mkdir nixos-chroot && cd nixos-chroot
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tar xf your-system-tarball.tar.xz
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mkdir sys dev proc tmp root var run
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mount --bind /sys sys
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mount --bind /dev dev
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mount --bind /proc proc
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Activate the system: look for a directory in nix/store similar to:
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"/nix/store/y0d1lcj9fppli0hl3x0m0ba5g1ndjv2j-nixos-feb97bx-53f008"
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Having found it, activate that nixos system *twice*:
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chroot . /nix/store/SOMETHING-nixos-SOMETHING/activate
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chroot . /nix/store/SOMETHING-nixos-SOMETHING/activate
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This runs a 'hostname' command. Restore your old hostname with:
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hostname OLDHOSTNAME
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Copy your system resolv.conf to the /etc/resolv.conf inside the chroot:
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cp /etc/resolv.conf etc
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Then you can get an interactive shell in the nixos chroot. '*' means
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to run inside the chroot interactive shell
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chroot . /bin/sh
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* source /etc/profile
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Populate the nix database: that should be done in the init script if you
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had booted this nixos. Run:
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* `grep local-cmds run/current-system/init`
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Then you can proceed normally subscribing to a nixos channel:
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nix-channel --add https://nixos.org/channels/nixos-unstable
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nix-channel --update
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Testing:
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nix-env -i hello
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which hello
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hello
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