[bug#42317] Adding a "Running Guix on a Linode" to the cookbook

[Joshua Branson via Guix-patches via <guix-patches@gnu.org>]

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From 4fd558ae00c5137b76e2a365b1640b95d4f02913 Mon Sep 17 00:00:00 2001
From: Joshua Branson <jbranso@dismail.de>
Date: Fri, 10 Jul 2020 20:32:30 -0400
Subject: [PATCH] doc: cookbook:  Adding a section "Running Guix on a Linode""

* doc/guix-cookbook.texi (Running Guix on a Linode):
I added a section that explains how to run guix on a linode.
Thanks Chris Webber!
---
 doc/guix-cookbook.texi | 239 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 239 insertions(+)

diff --git a/doc/guix-cookbook.texi b/doc/guix-cookbook.texi
index f541592d13..a907ddaf33 100644
--- a/doc/guix-cookbook.texi
+++ b/doc/guix-cookbook.texi
@@ -16,6 +16,7 @@ Copyright @copyright{} 2020 Matthew Brooks@*
 Copyright @copyright{} 2020 Marcin Karpezo@*
 Copyright @copyright{} 2020 Brice Waegeneire@*
 Copyright @copyright{} 2020 André Batista@*
+Copyright @copyright{} 2020 Christopher Lemmer Webber
 
 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
@@ -1347,6 +1348,7 @@ reference.
 * Customizing the Kernel::       Creating and using a custom Linux kernel on Guix System.
 * Connecting to Wireguard VPN::  Connecting to a Wireguard VPN.
 * Customizing a Window Manager:: Handle customization of a Window manager on Guix System.
+* Running Guix on a Linode:: Running Guix on a Linode
 * Setting up a bind mount:: Setting up a bind mount in the file-systems definition.
 * Getting substitutes from Tor:: Configuring Guix daemon to get substitutes through Tor.
 @end menu
@@ -1759,6 +1761,243 @@ your screen but not suspend it, it's a good idea to notify xss-lock about this s
 confusion occurs. This can be done by executing @code{xset s activate} immediately
 before you execute slock.
 
+@node Running Guix on a Linode
+@section Running Guix on a Linode
+@cindex linode
+
+Start with a recommended Debian server.  We recommend using the default
+distro as a way to bootstrap Guix. Create your ssh keys.
+
+@example
+ssh-keygen
+@end example
+
+Be sure to add your ssh key for easy login to the remote server.  This
+is trivially done via linode's graphical interface for adding ssh keys.
+Go to your profile and click add SSH Key.  Copy into it the output of:
+
+@example
+cat ~/.ssh/<username>_rsa.pub
+@end example
+
+Power the linode down. In the Linode's Disks/Configurations tab, resize
+the Debian disk to be smaller. 30 GB is recommended.
+
+In the Linode settings, "Add a disk", with the following:
+@itemize @bullet
+@item
+Label: "Guix"
+
+@item
+Filesystem: ext4
+
+@item
+Set it to the remaining size
+@end itemize
+
+On the "configuration" field that comes with the default image, press
+"..." and select "Edit", then on that menu add to /dev/sdc the "Guix"
+label.
+
+Now "Add a Configuration", with the following:
+@itemize @bullet
+@item
+Label: Guix
+
+@item
+Kernel: Grub 2 (it's at the bottom!  This step is @b{IMPORTANT!})
+
+@item
+Block device assignment:
+
+@item
+/dev/sda: Guix
+
+@item
+/dev/sdb: swap
+
+@item
+Root device: /dev/sda
+
+@item
+Turn off all the filesystem/boot helpers
+@end itemize
+
+Now power it back up, picking the Debian configuration.  Once it's
+booted up, ssh in your server via @code{ssh
+root@@<your-server-ip-here>}. (You can find your server ip address in
+your Linode Summary section.) Now you can run the "install guix from
+binary installer" steps:
+
+@example
+sudo apt-get install gpg
+wget https://sv.gnu.org/people/viewgpg.php?user_id=15145 -qO - | gpg --import -
+wget https://git.savannah.gnu.org/cgit/guix.git/plain/etc/guix-install.sh
+chmod +x guix-install.sh
+./guix-install.sh
+guix pull
+@end example
+
+Now it's time to write out a config for the server.  The key information
+is below. Save the resulting file as @code{guix-config.scm}.
+
+@lisp
+(use-modules (gnu)
+             (guix modules))
+(use-service-modules networking
+                     ssh)
+(use-package-modules admin
+                     certs
+                     package-management
+                     ssh
+                     tls)
+
+(operating-system
+  (host-name "my-server")
+  (timezone "America/New_York")
+  (locale "en_US.UTF-8")
+  ;; This goofy code will generate the grub.cfg
+  ;; without installing the grub bootloader on disk.
+  (bootloader (bootloader-configuration
+               (bootloader
+                (bootloader
+                 (inherit grub-bootloader)
+                 (installer #~(const #t))))))
+  (file-systems (cons (file-system
+                        (device "/dev/sda")
+                        (mount-point "/")
+                        (type "ext4"))
+                      %base-file-systems))
+
+
+  (swap-devices (list "/dev/sdb"))
+
+
+  (initrd-modules (cons "virtio_scsi"    ; Needed to find the disk
+                        %base-initrd-modules))
+
+  (users (cons (user-account
+                (name "janedoe")
+                (group "users")
+                ;; Adding the account to the "wheel" group
+                ;; makes it a sudoer.
+                (supplementary-groups '("wheel"))
+                (home-directory "/home/janedoe"))
+               %base-user-accounts))
+
+  (packages (cons* nss-certs            ;for HTTPS access
+                   openssh-sans-x
+                   %base-packages))
+
+  (services (cons*
+             (service dhcp-client-service-type)
+             (service openssh-service-type
+                      (openssh-configuration
+                       (openssh openssh-sans-x)
+                       (password-authentication? #f)
+                       (authorized-keys
+                        `(("janedoe" ,(local-file "janedoe_rsa.pub"))
+                          ("root" ,(local-file "janedoe_rsa.pub"))))))
+             %base-services)))
+@end lisp
+
+Replace the following fields in the above configuration:
+@lisp
+(host-name "my-server")       ; replace with your server name
+; if you chose a linode server outside the U.S., then
+; use tzselect to find a correct timezone string
+(timezone "America/New_York") ; if needed replace timezone
+(name "janedoe")              ; replace with your username
+("janedoe" ,(local-file "janedoe_rsa.pub")) ; replace with your ssh key
+("root" ,(local-file "janedoe_rsa.pub")) ; replace with your ssh key
+@end lisp
+
+The last line in the above example lets you log into the server as root
+and set the initial root password.  After you have done this, you may
+delete that line from your configuration and reconfigure to prevent root
+login.
+
+Save your ssh public key (eg: @code{~/.ssh/id_rsa.pub}) as
+<your-username-here>_rsa.pub and your @code{guix-config.scm} in the same
+directory.  In a new terminal run these commands.
+
+@example
+sftp root@@<remote server ip address>
+put /home/<username>/ssh/id_rsa.pub .
+put /path/to/linode/guix-config.scm .
+@end example
+
+In your first terminal, mount the guix drive:
+
+@example
+mkdir /mnt/guix
+mount /dev/sdc /mnt/guix
+@end example
+
+Due to the way we set things up above, we do not install Grub
+completely.  Instead we install only our grub configuration file.  So we
+need to copy over some of the other Grub stuff that is already there:
+
+@example
+mkdir -p /mnt/guix/boot/grub
+cp -r /boot/grub/* /mnt/guix/boot/grub/
+@end example
+
+Now initialize the Guix installation:
+
+@example
+guix system init guix-config.scm /mnt/guix
+@end example
+
+Ok, power it down!
+Now from the linode console, select boot and select "Guix".
+
+Once it boots, you should be able to log in via ssh!  (The server
+config will have changed though.)  You may encounter an error like:
+
+@example
+$ ssh root@@<server ip address>
+@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
+@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
+Someone could be eavesdropping on you right now (man-in-the-middle attack)!
+It is also possible that a host key has just been changed.
+The fingerprint for the ECDSA key sent by the remote host is
+SHA256:0B+wp33w57AnKQuHCvQP0+ZdKaqYrI/kyU7CfVbS7R4.
+Please contact your system administrator.
+Add correct host key in /home/joshua/.ssh/known_hosts to get rid of this message.
+Offending ECDSA key in /home/joshua/.ssh/known_hosts:3
+ECDSA host key for 198.58.98.76 has changed and you have requested strict checking.
+Host key verification failed.
+@end example
+
+Either delete ~/.ssh/known_hosts file, or delete the offending line
+starting with your server IP address.
+
+Be sure to set your password and root's password.
+
+@example
+ssh root@@<remote ip address>
+passwd  ; for the root password
+passwd <username> ; for the user password
+@end example
+
+You may not be able to run the above commands at this point.  If you
+have issues ssh-ing into your box, then you may still need to set your
+root and user password initially by clicking on the ``Launch Console''
+option in your linode.  Choose the ``Glish'' instead of ``Weblish''.
+Now you should be able to ssh into the machine.
+
+Horray!  At this point you can shut down the server, delete the
+Debian disk, and resize the Guix to the rest of the size.
+Congratulations!
+
+By the way, if you save it as a disk image right at this point, you'll
+have an easy time spinning up new Guix images!  You may need to
+down-size the Guix image to 6144MB, to save it as an image.  Then you
+can resize it again to the max size.
+
 @node Setting up a bind mount
 @section Setting up a bind mount
 
-- 
2.28.0