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Diffstat (limited to 'doc/guix.texi')
| -rw-r--r-- | doc/guix.texi | 69 |
1 files changed, 49 insertions, 20 deletions
diff --git a/doc/guix.texi b/doc/guix.texi index ebb138e15d..f1cb007aa9 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -567,6 +567,12 @@ guix import}). It is of interest primarily for developers and not for casual users. @item +@c Note: We need at least 0.10.2 for 'channel-send-eof'. +Support for build offloading (@pxref{Daemon Offload Setup}) depends on +@uref{https://github.com/artyom-poptsov/guile-ssh, Guile-SSH}, +version 0.10.2 or later. + +@item When @url{http://zlib.net, zlib} is available, @command{guix publish} can compress build byproducts (@pxref{Invoking guix publish}). @end itemize @@ -814,9 +820,11 @@ available on the system---making it much harder to view them as @cindex offloading @cindex build hook -When desired, the build daemon can @dfn{offload} -derivation builds to other machines -running Guix, using the @code{offload} @dfn{build hook}. When that +When desired, the build daemon can @dfn{offload} derivation builds to +other machines running Guix, using the @code{offload} @dfn{build +hook}@footnote{This feature is available only when +@uref{https://github.com/artyom-poptsov/guile-ssh, Guile-SSH} is +present.}. When that feature is enabled, a list of user-specified build machines is read from @file{/etc/guix/machines.scm}; every time a build is requested, for instance via @code{guix build}, the daemon attempts to offload it to one @@ -832,16 +840,18 @@ The @file{/etc/guix/machines.scm} file typically looks like this: (list (build-machine (name "eightysix.example.org") (system "x86_64-linux") + (host-key "ssh-ed25519 AAAAC3Nza@dots{}") (user "bob") - (speed 2.)) ; incredibly fast! + (speed 2.)) ;incredibly fast! (build-machine (name "meeps.example.org") (system "mips64el-linux") + (host-key "ssh-rsa AAAAB3Nza@dots{}") (user "alice") (private-key (string-append (getenv "HOME") - "/.lsh/identity-for-guix")))) + "/.ssh/identity-for-guix")))) @end example @noindent @@ -875,31 +885,50 @@ The user account to use when connecting to the remote machine over SSH. Note that the SSH key pair must @emph{not} be passphrase-protected, to allow non-interactive logins. +@item host-key +This must be the machine's SSH @dfn{public host key} in OpenSSH format. +This is used to authenticate the machine when we connect to it. It is a +long string that looks like this: + +@example +ssh-ed25519 AAAAC3NzaC@dots{}mde+UhL hint@@example.org +@end example + +If the machine is running the OpenSSH daemon, @command{sshd}, the host +key can be found in a file such as +@file{/etc/ssh/ssh_host_ed25519_key.pub}. + +If the machine is running the SSH daemon of GNU@tie{}lsh, +@command{lshd}, the host key is in @file{/etc/lsh/host-key.pub} or a +similar file. It can be converted to the OpenSSH format using +@command{lsh-export-key} (@pxref{Converting keys,,, lsh, LSH Manual}): + +@example +$ lsh-export-key --openssh < /etc/lsh/host-key.pub +ssh-rsa AAAAB3NzaC1yc2EAAAAEOp8FoQAAAQEAs1eB46LV@dots{} +@end example + @end table A number of optional fields may be specified: -@table @code - -@item port -Port number of SSH server on the machine (default: 22). +@table @asis -@item private-key -The SSH private key file to use when connecting to the machine. +@item @code{port} (default: @code{22}) +Port number of SSH server on the machine. -Currently offloading uses GNU@tie{}lsh as its SSH client -(@pxref{Invoking lsh,,, GNU lsh Manual}). Thus, the key file here must -be an lsh key file. This may change in the future, though. +@item @code{private-key} (default: @file{~/.ssh/id_rsa}) +The SSH private key file to use when connecting to the machine, in +OpenSSH format. -@item parallel-builds -The number of builds that may run in parallel on the machine (1 by -default.) +@item @code{parallel-builds} (default: @code{1}) +The number of builds that may run in parallel on the machine. -@item speed +@item @code{speed} (default: @code{1.0}) A ``relative speed factor''. The offload scheduler will tend to prefer machines with a higher speed factor. -@item features +@item @code{features} (default: @code{'()}) A list of strings denoting specific features supported by the machine. An example is @code{"kvm"} for machines that have the KVM Linux modules and corresponding hardware support. Derivations can request features by @@ -915,7 +944,7 @@ machines, since offloading works by invoking the @code{guix archive} and this is the case by running: @example -lsh build-machine guile -c "'(use-modules (guix config))'" +ssh build-machine guile -c "'(use-modules (guix config))'" @end example There is one last thing to do once @file{machines.scm} is in place. As |