diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/guix.texi | 27 | ||||
| -rw-r--r-- | doc/images/dmd-graph.dot | 75 |
2 files changed, 98 insertions, 4 deletions
diff --git a/doc/guix.texi b/doc/guix.texi index 0e0e507714..fd0adfd203 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -7004,6 +7004,12 @@ $ guix system extension-graph @var{file} | dot -Tpdf > services.pdf produces a PDF file showing the extension relations among services. +@anchor{system-dmd-graph} +@item dmd-graph +Emit in Dot/Graphviz format to standard output the @dfn{dependency +graph} of dmd services of the operating system defined in @var{file}. +@xref{dmd Services}, for more information and for an example graph. + @end table @@ -7332,10 +7338,23 @@ setuid-root programs on the system (@pxref{Setuid Programs}). The @code{(gnu services dmd)} provides a way to define services managed by GNU@tie{}dmd, which is GuixSD initialization system---the first process that is started when the system boots, aka. PID@tie{}1 -(@pxref{Introduction,,, dmd, GNU dmd Manual}). The -@var{%dmd-root-service} represents PID@tie{}1, of type -@var{dmd-root-service-type}; it can be extended by passing it lists of -@code{<dmd-service>} objects. +(@pxref{Introduction,,, dmd, GNU dmd Manual}). + +Services in dmd can depend on each other. For instance, the SSH daemon +may need to be started after the syslog daemon has been started, which +in turn can only happen once all the file systems have been mounted. +The simple operating system defined earlier (@pxref{Using the +Configuration System}) results in a service graph like this: + +@image{images/dmd-graph,,5in,Typical dmd service graph.} + +You can actually generate such a graph for any operating system +definition using the @command{guix system dmd-graph} command +(@pxref{system-dmd-graph, @command{guix system dmd-graph}}). + +The @var{%dmd-root-service} is a service object representing PID@tie{}1, +of type @var{dmd-root-service-type}; it can be extended by passing it +lists of @code{<dmd-service>} objects. @deftp {Data Type} dmd-service The data type representing a service managed by dmd. diff --git a/doc/images/dmd-graph.dot b/doc/images/dmd-graph.dot new file mode 100644 index 0000000000..220a2afca1 --- /dev/null +++ b/doc/images/dmd-graph.dot @@ -0,0 +1,75 @@ +digraph "Guix dmd-service" { + "user-file-systems" [label = "user-file-systems", shape = box, fontname = Helvetica]; + "user-processes" -> "user-file-systems" [color = red]; + "user-processes" [label = "user-processes", shape = box, fontname = Helvetica]; + "nscd" -> "user-processes" [color = red]; + "guix-daemon" -> "user-processes" [color = red]; + "syslogd" -> "user-processes" [color = red]; + "term-tty6" -> "user-processes" [color = red]; + "term-tty5" -> "user-processes" [color = red]; + "term-tty4" -> "user-processes" [color = red]; + "term-tty3" -> "user-processes" [color = red]; + "term-tty2" -> "user-processes" [color = red]; + "term-tty1" -> "user-processes" [color = red]; + "networking" -> "user-processes" [color = red]; + "nscd" [label = "nscd", shape = box, fontname = Helvetica]; + "guix-daemon" [label = "guix-daemon", shape = box, fontname = Helvetica]; + "syslogd" [label = "syslogd", shape = box, fontname = Helvetica]; + "ssh-daemon" -> "syslogd" [color = red]; + "ssh-daemon" [label = "ssh-daemon", shape = box, fontname = Helvetica]; + "term-tty6" [label = "term-tty6", shape = box, fontname = Helvetica]; + "console-font-tty6" -> "term-tty6" [color = red]; + "console-font-tty6" [label = "console-font-tty6", shape = box, fontname = Helvetica]; + "term-tty5" [label = "term-tty5", shape = box, fontname = Helvetica]; + "console-font-tty5" -> "term-tty5" [color = red]; + "console-font-tty5" [label = "console-font-tty5", shape = box, fontname = Helvetica]; + "term-tty4" [label = "term-tty4", shape = box, fontname = Helvetica]; + "console-font-tty4" -> "term-tty4" [color = red]; + "console-font-tty4" [label = "console-font-tty4", shape = box, fontname = Helvetica]; + "term-tty3" [label = "term-tty3", shape = box, fontname = Helvetica]; + "console-font-tty3" -> "term-tty3" [color = red]; + "console-font-tty3" [label = "console-font-tty3", shape = box, fontname = Helvetica]; + "term-tty2" [label = "term-tty2", shape = box, fontname = Helvetica]; + "console-font-tty2" -> "term-tty2" [color = red]; + "console-font-tty2" [label = "console-font-tty2", shape = box, fontname = Helvetica]; + "term-tty1" [label = "term-tty1", shape = box, fontname = Helvetica]; + "console-font-tty1" -> "term-tty1" [color = red]; + "console-font-tty1" [label = "console-font-tty1", shape = box, fontname = Helvetica]; + "networking" [label = "networking", shape = box, fontname = Helvetica]; + "ssh-daemon" -> "networking" [color = red]; + "root-file-system" [label = "root-file-system", shape = box, fontname = Helvetica]; + "file-system-/run/user" -> "root-file-system" [color = red]; + "file-system-/run/systemd" -> "root-file-system" [color = red]; + "file-system-/gnu/store" -> "root-file-system" [color = red]; + "file-system-/dev/shm" -> "root-file-system" [color = red]; + "file-system-/dev/pts" -> "root-file-system" [color = red]; + "user-processes" -> "root-file-system" [color = red]; + "udev" -> "root-file-system" [color = red]; + "file-system-/run/user" [label = "file-system-/run/user", shape = box, fontname = Helvetica]; + "user-processes" -> "file-system-/run/user" [color = red]; + "file-system-/run/systemd" [label = "file-system-/run/systemd", shape = box, fontname = Helvetica]; + "user-processes" -> "file-system-/run/systemd" [color = red]; + "file-system-/gnu/store" [label = "file-system-/gnu/store", shape = box, fontname = Helvetica]; + "user-processes" -> "file-system-/gnu/store" [color = red]; + "file-system-/dev/shm" [label = "file-system-/dev/shm", shape = box, fontname = Helvetica]; + "user-processes" -> "file-system-/dev/shm" [color = red]; + "file-system-/dev/pts" [label = "file-system-/dev/pts", shape = box, fontname = Helvetica]; + "user-processes" -> "file-system-/dev/pts" [color = red]; + "udev" [label = "udev", shape = box, fontname = Helvetica]; + "term-tty6" -> "udev" [color = red]; + "term-tty5" -> "udev" [color = red]; + "term-tty4" -> "udev" [color = red]; + "term-tty3" -> "udev" [color = red]; + "term-tty2" -> "udev" [color = red]; + "term-tty1" -> "udev" [color = red]; + "networking" -> "udev" [color = red]; + "host-name" [label = "host-name", shape = box, fontname = Helvetica]; + "term-tty6" -> "host-name" [color = red]; + "term-tty5" -> "host-name" [color = red]; + "term-tty4" -> "host-name" [color = red]; + "term-tty3" -> "host-name" [color = red]; + "term-tty2" -> "host-name" [color = red]; + "term-tty1" -> "host-name" [color = red]; + "loopback" [label = "loopback", shape = box, fontname = Helvetica]; + +} |