cb1ca42009
The instructions to install nixos behind a proxy were not clear. While one could guess that setting http_proxy variables can get the install rolling, one could end up with an installed system where the proxy settings for the nix-daemon are not configured. This commit updates the documentation with 1. steps to install behind a proxy 2. configure the global proxy settings so that nix-daemon can access internet. 3. Pointers to use nesting.clone in case one has to use different proxy settings on different networks.
448 lines
17 KiB
XML
448 lines
17 KiB
XML
<chapter xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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version="5.0"
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xml:id="sec-installation">
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<title>Installing NixOS</title>
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<para>
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NixOS can be installed on BIOS or UEFI systems. The procedure for a UEFI
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installation is by and large the same as a BIOS installation. The differences
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are mentioned in the steps that follow.
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</para>
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<orderedlist>
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<listitem>
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<para>
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Boot from the CD.
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</para>
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<variablelist>
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<varlistentry>
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<term>
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UEFI systems
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</term>
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<listitem>
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<para>
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You should boot the live CD in UEFI mode (consult your specific
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hardware's documentation for instructions). You may find the
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<link xlink:href="http://www.rodsbooks.com/refind">rEFInd boot
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manager</link> useful.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</listitem>
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<listitem>
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<para>
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The CD contains a basic NixOS installation. (It also contains Memtest86+,
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useful if you want to test new hardware). When it’s finished booting, it
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should have detected most of your hardware.
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</para>
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</listitem>
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<listitem>
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<para>
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The NixOS manual is available on virtual console 8 (press Alt+F8 to access)
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or by running <command>nixos-help</command>.
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</para>
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</listitem>
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<listitem>
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<para>
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You get logged in as <literal>root</literal> (with empty password).
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</para>
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</listitem>
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<listitem>
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<para>
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If you downloaded the graphical ISO image, you can run <command>systemctl
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start display-manager</command> to start KDE. If you want to continue on
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the terminal, you can use <command>loadkeys</command> to switch to your
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preferred keyboard layout. (We even provide neo2 via <command>loadkeys de
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neo</command>!)
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</para>
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</listitem>
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<listitem>
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<para>
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The boot process should have brought up networking (check <command>ip
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a</command>). Networking is necessary for the installer, since it will
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download lots of stuff (such as source tarballs or Nixpkgs channel
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binaries). It’s best if you have a DHCP server on your network. Otherwise
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configure networking manually using <command>ifconfig</command>.
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</para>
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<para>
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To manually configure the network on the graphical installer, first disable
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network-manager with <command>systemctl stop network-manager</command>.
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</para>
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<para>
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To manually configure the wifi on the minimal installer, run
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<command>wpa_supplicant -B -i interface -c <(wpa_passphrase 'SSID'
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'key')</command>.
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</para>
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</listitem>
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<listitem>
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<para>
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If you would like to continue the installation from a different machine you
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need to activate the SSH daemon via <literal>systemctl start
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sshd</literal>. In order to be able to login you also need to set a
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password for <literal>root</literal> using <literal>passwd</literal>.
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</para>
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</listitem>
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<listitem>
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<para>
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The NixOS installer doesn’t do any partitioning or formatting yet, so you
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need to do that yourself. Use the following commands:
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<itemizedlist>
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<listitem>
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<para>
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For partitioning: <command>fdisk</command>.
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<screen>
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# fdisk /dev/sda # <lineannotation>(or whatever device you want to install on)</lineannotation>
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-- for UEFI systems only
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> n # <lineannotation>(create a new partition for /boot)</lineannotation>
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> 3 # <lineannotation>(make it a partition number 3)</lineannotation>
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> # <lineannotation>(press enter to accept the default)</lineannotation>
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> +512M # <lineannotation>(the size of the UEFI boot partition)</lineannotation>
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> t # <lineannotation>(change the partition type ...)</lineannotation>
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> 3 # <lineannotation>(... of the boot partition ...)</lineannotation>
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> 1 # <lineannotation>(... to 'UEFI System')</lineannotation>
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-- for BIOS or UEFI systems
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> n # <lineannotation>(create a new partition for /swap)</lineannotation>
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> 2 # <lineannotation>(make it a partition number 2)</lineannotation>
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> # <lineannotation>(press enter to accept the default)</lineannotation>
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> +8G # <lineannotation>(the size of the swap partition, set to whatever you like)</lineannotation>
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> n # <lineannotation>(create a new partition for /)</lineannotation>
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> 1 # <lineannotation>(make it a partition number 1)</lineannotation>
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> # <lineannotation>(press enter to accept the default)</lineannotation>
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> # <lineannotation>(press enter to accept the default and use the rest of the remaining space)</lineannotation>
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> a # <lineannotation>(make the partition bootable)</lineannotation>
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> x # <lineannotation>(enter expert mode)</lineannotation>
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> f # <lineannotation>(fix up the partition ordering)</lineannotation>
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> r # <lineannotation>(exit expert mode)</lineannotation>
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> w # <lineannotation>(write the partition table to disk and exit)</lineannotation></screen>
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</para>
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</listitem>
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<listitem>
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<para>
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For initialising Ext4 partitions: <command>mkfs.ext4</command>. It is
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recommended that you assign a unique symbolic label to the file system
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using the option <option>-L <replaceable>label</replaceable></option>,
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since this makes the file system configuration independent from device
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changes. For example:
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<screen>
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# mkfs.ext4 -L nixos /dev/sda1</screen>
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</para>
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</listitem>
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<listitem>
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<para>
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For creating swap partitions: <command>mkswap</command>. Again it’s
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recommended to assign a label to the swap partition: <option>-L
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<replaceable>label</replaceable></option>. For example:
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<screen>
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# mkswap -L swap /dev/sda2</screen>
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</para>
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</listitem>
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<listitem>
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<variablelist>
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<varlistentry>
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<term>
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UEFI systems
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</term>
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<listitem>
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<para>
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For creating boot partitions: <command>mkfs.fat</command>. Again
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it’s recommended to assign a label to the boot partition:
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<option>-n <replaceable>label</replaceable></option>. For example:
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<screen>
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# mkfs.fat -F 32 -n boot /dev/sda3</screen>
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</listitem>
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<listitem>
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<para>
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For creating LVM volumes, the LVM commands, e.g.,
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<command>pvcreate</command>, <command>vgcreate</command>, and
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<command>lvcreate</command>.
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</para>
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</listitem>
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<listitem>
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<para>
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For creating software RAID devices, use <command>mdadm</command>.
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</para>
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</listitem>
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</itemizedlist>
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</para>
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</listitem>
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<listitem>
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<para>
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Mount the target file system on which NixOS should be installed on
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<filename>/mnt</filename>, e.g.
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<screen>
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# mount /dev/disk/by-label/nixos /mnt
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</screen>
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</para>
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</listitem>
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<listitem>
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<variablelist>
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<varlistentry>
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<term>
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UEFI systems
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</term>
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<listitem>
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<para>
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Mount the boot file system on <filename>/mnt/boot</filename>, e.g.
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<screen>
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# mkdir -p /mnt/boot
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# mount /dev/disk/by-label/boot /mnt/boot
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</screen>
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</listitem>
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<listitem>
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<para>
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If your machine has a limited amount of memory, you may want to activate
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swap devices now (<command>swapon
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<replaceable>device</replaceable></command>). The installer (or rather, the
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build actions that it may spawn) may need quite a bit of RAM, depending on
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your configuration.
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<screen>
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# swapon /dev/sda2</screen>
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</para>
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</listitem>
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<listitem>
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<para>
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You now need to create a file
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<filename>/mnt/etc/nixos/configuration.nix</filename> that specifies the
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intended configuration of the system. This is because NixOS has a
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<emphasis>declarative</emphasis> configuration model: you create or edit a
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description of the desired configuration of your system, and then NixOS
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takes care of making it happen. The syntax of the NixOS configuration file
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is described in <xref linkend="sec-configuration-syntax"/>, while a list of
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available configuration options appears in
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<xref
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linkend="ch-options"/>. A minimal example is shown in
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<xref
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linkend="ex-config"/>.
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</para>
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<para>
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The command <command>nixos-generate-config</command> can generate an
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initial configuration file for you:
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<screen>
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# nixos-generate-config --root /mnt</screen>
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You should then edit <filename>/mnt/etc/nixos/configuration.nix</filename>
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to suit your needs:
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<screen>
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# nano /mnt/etc/nixos/configuration.nix
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</screen>
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If you’re using the graphical ISO image, other editors may be available
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(such as <command>vim</command>). If you have network access, you can also
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install other editors — for instance, you can install Emacs by running
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<literal>nix-env -i emacs</literal>.
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</para>
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<variablelist>
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<varlistentry>
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<term>
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BIOS systems
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</term>
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<listitem>
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<para>
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You <emphasis>must</emphasis> set the option
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<xref linkend="opt-boot.loader.grub.device"/> to specify on which disk
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the GRUB boot loader is to be installed. Without it, NixOS cannot boot.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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UEFI systems
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</term>
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<listitem>
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<para>
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You <emphasis>must</emphasis> set the option
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<xref linkend="opt-boot.loader.systemd-boot.enable"/> to
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<literal>true</literal>. <command>nixos-generate-config</command> should
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do this automatically for new configurations when booted in UEFI mode.
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</para>
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<para>
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You may want to look at the options starting with
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<option><link linkend="opt-boot.loader.efi.canTouchEfiVariables">boot.loader.efi</link></option>
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and
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<option><link linkend="opt-boot.loader.systemd-boot.enable">boot.loader.systemd</link></option>
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as well.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>
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If there are other operating systems running on the machine before
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installing NixOS, the <xref linkend="opt-boot.loader.grub.useOSProber"/>
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option can be set to <literal>true</literal> to automatically add them to
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the grub menu.
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</para>
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<para>
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Another critical option is <option>fileSystems</option>, specifying the
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file systems that need to be mounted by NixOS. However, you typically
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don’t need to set it yourself, because
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<command>nixos-generate-config</command> sets it automatically in
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<filename>/mnt/etc/nixos/hardware-configuration.nix</filename> from your
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currently mounted file systems. (The configuration file
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<filename>hardware-configuration.nix</filename> is included from
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<filename>configuration.nix</filename> and will be overwritten by future
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invocations of <command>nixos-generate-config</command>; thus, you
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generally should not modify it.)
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</para>
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<note>
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<para>
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Depending on your hardware configuration or type of file system, you may
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need to set the option <option>boot.initrd.kernelModules</option> to
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include the kernel modules that are necessary for mounting the root file
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system, otherwise the installed system will not be able to boot. (If this
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happens, boot from the CD again, mount the target file system on
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<filename>/mnt</filename>, fix
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<filename>/mnt/etc/nixos/configuration.nix</filename> and rerun
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<filename>nixos-install</filename>.) In most cases,
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<command>nixos-generate-config</command> will figure out the required
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modules.
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</para>
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</note>
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</listitem>
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<listitem>
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<para>
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Do the installation:
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<screen>
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# nixos-install</screen>
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Cross fingers. If this fails due to a temporary problem (such as a network
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issue while downloading binaries from the NixOS binary cache), you can just
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re-run <command>nixos-install</command>. Otherwise, fix your
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<filename>configuration.nix</filename> and then re-run
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<command>nixos-install</command>.
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</para>
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<para>
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As the last step, <command>nixos-install</command> will ask you to set the
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password for the <literal>root</literal> user, e.g.
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<screen>
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setting root password...
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Enter new UNIX password: ***
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Retype new UNIX password: ***
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</screen>
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<note>
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<para>
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For unattended installations, it is possible to use
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<command>nixos-install --no-root-passwd</command>
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in order to disable the password prompt entirely.
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</para>
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</note>
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</para>
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</listitem>
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<listitem>
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<para>
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If everything went well:
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<screen>
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# reboot</screen>
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</para>
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</listitem>
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<listitem>
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<para>
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You should now be able to boot into the installed NixOS. The GRUB boot menu
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shows a list of <emphasis>available configurations</emphasis> (initially
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just one). Every time you change the NixOS configuration (see
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<link
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linkend="sec-changing-config">Changing Configuration</link>
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), a new item is added to the menu. This allows you to easily roll back to
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a previous configuration if something goes wrong.
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</para>
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<para>
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You should log in and change the <literal>root</literal> password with
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<command>passwd</command>.
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</para>
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<para>
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You’ll probably want to create some user accounts as well, which can be
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done with <command>useradd</command>:
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<screen>
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$ useradd -c 'Eelco Dolstra' -m eelco
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$ passwd eelco</screen>
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</para>
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<para>
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You may also want to install some software. For instance,
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<screen>
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$ nix-env -qa \*</screen>
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shows what packages are available, and
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<screen>
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$ nix-env -i w3m</screen>
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install the <literal>w3m</literal> browser.
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</para>
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</listitem>
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</orderedlist>
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<para>
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To summarise, <xref linkend="ex-install-sequence" /> shows a typical sequence
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of commands for installing NixOS on an empty hard drive (here
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<filename>/dev/sda</filename>). <xref linkend="ex-config"
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/> shows a
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corresponding configuration Nix expression.
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</para>
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<example xml:id='ex-install-sequence'>
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<title>Commands for Installing NixOS on <filename>/dev/sda</filename></title>
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<screen>
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# fdisk /dev/sda # <lineannotation>(or whatever device you want to install on)</lineannotation>
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-- for UEFI systems only
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> n # <lineannotation>(create a new partition for /boot)</lineannotation>
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> 3 # <lineannotation>(make it a partition number 3)</lineannotation>
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> # <lineannotation>(press enter to accept the default)</lineannotation>
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> +512M # <lineannotation>(the size of the UEFI boot partition)</lineannotation>
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> t # <lineannotation>(change the partition type ...)</lineannotation>
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> 3 # <lineannotation>(... of the boot partition ...)</lineannotation>
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> 1 # <lineannotation>(... to 'UEFI System')</lineannotation>
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-- for BIOS or UEFI systems
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> n # <lineannotation>(create a new partition for /swap)</lineannotation>
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> 2 # <lineannotation>(make it a partition number 2)</lineannotation>
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> # <lineannotation>(press enter to accept the default)</lineannotation>
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> +8G # <lineannotation>(the size of the swap partition)</lineannotation>
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> n # <lineannotation>(create a new partition for /)</lineannotation>
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> 1 # <lineannotation>(make it a partition number 1)</lineannotation>
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> # <lineannotation>(press enter to accept the default)</lineannotation>
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> # <lineannotation>(press enter to accept the default and use the rest of the remaining space)</lineannotation>
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> a # <lineannotation>(make the partition bootable)</lineannotation>
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> x # <lineannotation>(enter expert mode)</lineannotation>
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> f # <lineannotation>(fix up the partition ordering)</lineannotation>
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> r # <lineannotation>(exit expert mode)</lineannotation>
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> w # <lineannotation>(write the partition table to disk and exit)</lineannotation>
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# mkfs.ext4 -L nixos /dev/sda1
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# mkswap -L swap /dev/sda2
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# swapon /dev/sda2
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# mkfs.fat -F 32 -n boot /dev/sda3 # <lineannotation>(for UEFI systems only)</lineannotation>
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# mount /dev/disk/by-label/nixos /mnt
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# mkdir -p /mnt/boot # <lineannotation>(for UEFI systems only)</lineannotation>
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# mount /dev/disk/by-label/boot /mnt/boot # <lineannotation>(for UEFI systems only)</lineannotation>
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# nixos-generate-config --root /mnt
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# nano /mnt/etc/nixos/configuration.nix
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# nixos-install
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# reboot</screen>
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</example>
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<example xml:id='ex-config'>
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<title>NixOS Configuration</title>
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<screen>
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{ config, pkgs, ... }: {
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imports = [
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# Include the results of the hardware scan.
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./hardware-configuration.nix
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];
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<xref linkend="opt-boot.loader.grub.device"/> = "/dev/sda"; # <lineannotation>(for BIOS systems only)</lineannotation>
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<xref linkend="opt-boot.loader.systemd-boot.enable"/> = true; # <lineannotation>(for UEFI systems only)</lineannotation>
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# Note: setting fileSystems is generally not
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# necessary, since nixos-generate-config figures them out
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# automatically in hardware-configuration.nix.
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#<link linkend="opt-fileSystems._name__.device">fileSystems."/".device</link> = "/dev/disk/by-label/nixos";
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# Enable the OpenSSH server.
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services.sshd.enable = true;
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}
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</screen>
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</example>
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<xi:include href="installing-usb.xml" />
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<xi:include href="installing-pxe.xml" />
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<xi:include href="installing-virtualbox-guest.xml" />
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<xi:include href="installing-from-other-distro.xml" />
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<xi:include href="installing-behind-a-proxy.xml" />
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</chapter>
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