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diff --git a/doc/guix.texi b/doc/guix.texi index ff306a4575..77435d897b 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -228,6 +228,7 @@ Services * Continuous Integration:: The Cuirass service. * Power management Services:: The TLP tool. * Audio Services:: The MPD. +* Virtualization Services:: Virtualization services. * Miscellaneous Services:: Other services. Defining Services @@ -9104,6 +9105,7 @@ declaration. * Continuous Integration:: The Cuirass service. * Power management Services:: The TLP tool. * Audio Services:: The MPD. +* Virtualization Services:: Virtualization services. * Miscellaneous Services:: Other services. @end menu @@ -15838,6 +15840,713 @@ an absolute path can be specified here. @end table @end deftp +@node Virtualization Services +@subsubsection Virtualization services +The @code{(gnu services virtualization)} module provides services for +the libvirt and virtlog daemons. + +@subsubheading Libvirt daemon +@code{libvirtd} is the server side daemon component of the libvirt +virtualization management system. This daemon runs on host servers +and performs required management tasks for virtualized guests. + +@deffn {Scheme Variable} libvirt-service-type +This is the type of the @uref{https://libvirt.org, libvirt daemon}. +Its value must be a @code{libvirt-configuration}. + +@example +(service libvirt-service-type + (libvirt-configuration + (unix-sock-group "libvirt") + (tls-port "16555"))) +@end example +@end deffn + +@c Auto-generated with (generate-libvirt-documentation) +Available @code{libvirt-configuration} fields are: + +@deftypevr {@code{libvirt-configuration} parameter} package libvirt +Libvirt package. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} boolean listen-tls? +Flag listening for secure TLS connections on the public TCP/IP port. +must set @code{listen} for this to have any effect. + +It is necessary to setup a CA and issue server certificates before using +this capability. + +Defaults to @samp{#t}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} boolean listen-tcp? +Listen for unencrypted TCP connections on the public TCP/IP port. must +set @code{listen} for this to have any effect. + +Using the TCP socket requires SASL authentication by default. Only SASL +mechanisms which support data encryption are allowed. This is +DIGEST_MD5 and GSSAPI (Kerberos5) + +Defaults to @samp{#f}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} string tls-port +Port for accepting secure TLS connections This can be a port number, or +service name + +Defaults to @samp{"16514"}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} string tcp-port +Port for accepting insecure TCP connections This can be a port number, +or service name + +Defaults to @samp{"16509"}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} string listen-addr +IP address or hostname used for client connections. + +Defaults to @samp{"0.0.0.0"}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} boolean mdns-adv? +Flag toggling mDNS advertisement of the libvirt service. + +Alternatively can disable for all services on a host by stopping the +Avahi daemon. + +Defaults to @samp{#f}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} string mdns-name +Default mDNS advertisement name. This must be unique on the immediate +broadcast network. + +Defaults to @samp{"Virtualization Host <hostname>"}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} string unix-sock-group +UNIX domain socket group ownership. This can be used to allow a +'trusted' set of users access to management capabilities without +becoming root. + +Defaults to @samp{"root"}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} string unix-sock-ro-perms +UNIX socket permissions for the R/O socket. This is used for monitoring +VM status only. + +Defaults to @samp{"0777"}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} string unix-sock-rw-perms +UNIX socket permissions for the R/W socket. Default allows only root. +If PolicyKit is enabled on the socket, the default will change to allow +everyone (eg, 0777) + +Defaults to @samp{"0770"}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} string unix-sock-admin-perms +UNIX socket permissions for the admin socket. Default allows only owner +(root), do not change it unless you are sure to whom you are exposing +the access to. + +Defaults to @samp{"0777"}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} string unix-sock-dir +The directory in which sockets will be found/created. + +Defaults to @samp{"/var/run/libvirt"}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} string auth-unix-ro +Authentication scheme for UNIX read-only sockets. By default socket +permissions allow anyone to connect + +Defaults to @samp{"polkit"}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} string auth-unix-rw +Authentication scheme for UNIX read-write sockets. By default socket +permissions only allow root. If PolicyKit support was compiled into +libvirt, the default will be to use 'polkit' auth. + +Defaults to @samp{"polkit"}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} string auth-tcp +Authentication scheme for TCP sockets. If you don't enable SASL, then +all TCP traffic is cleartext. Don't do this outside of a dev/test +scenario. + +Defaults to @samp{"sasl"}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} string auth-tls +Authentication scheme for TLS sockets. TLS sockets already have +encryption provided by the TLS layer, and limited authentication is done +by certificates. + +It is possible to make use of any SASL authentication mechanism as well, +by using 'sasl' for this option + +Defaults to @samp{"none"}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} optional-list access-drivers +API access control scheme. + +By default an authenticated user is allowed access to all APIs. Access +drivers can place restrictions on this. + +Defaults to @samp{()}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} string key-file +Server key file path. If set to an empty string, then no private key is +loaded. + +Defaults to @samp{""}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} string cert-file +Server key file path. If set to an empty string, then no certificate is +loaded. + +Defaults to @samp{""}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} string ca-file +Server key file path. If set to an empty string, then no CA certificate +is loaded. + +Defaults to @samp{""}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} string crl-file +Certificate revocation list path. If set to an empty string, then no +CRL is loaded. + +Defaults to @samp{""}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} boolean tls-no-sanity-cert +Disable verification of our own server certificates. + +When libvirtd starts it performs some sanity checks against its own +certificates. + +Defaults to @samp{#f}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} boolean tls-no-verify-cert +Disable verification of client certificates. + +Client certificate verification is the primary authentication mechanism. +Any client which does not present a certificate signed by the CA will be +rejected. + +Defaults to @samp{#f}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} optional-list tls-allowed-dn-list +Whitelist of allowed x509 Distinguished Name. + +Defaults to @samp{()}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} optional-list sasl-allowed-usernames +Whitelist of allowed SASL usernames. The format for username depends on +the SASL authentication mechanism. + +Defaults to @samp{()}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} string tls-priority +Override the compile time default TLS priority string. The default is +usually "NORMAL" unless overridden at build time. Only set this is it +is desired for libvirt to deviate from the global default settings. + +Defaults to @samp{"NORMAL"}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} integer max-clients +Maximum number of concurrent client connections to allow over all +sockets combined. + +Defaults to @samp{5000}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} integer max-queued-clients +Maximum length of queue of connections waiting to be accepted by the +daemon. Note, that some protocols supporting retransmission may obey +this so that a later reattempt at connection succeeds. + +Defaults to @samp{1000}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} integer max-anonymous-clients +Maximum length of queue of accepted but not yet authenticated clients. +Set this to zero to turn this feature off + +Defaults to @samp{20}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} integer min-workers +Number of workers to start up initially. + +Defaults to @samp{5}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} integer max-workers +Maximum number of worker threads. + +If the number of active clients exceeds @code{min-workers}, then more +threads are spawned, up to max_workers limit. Typically you'd want +max_workers to equal maximum number of clients allowed. + +Defaults to @samp{20}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} integer prio-workers +Number of priority workers. If all workers from above pool are stuck, +some calls marked as high priority (notably domainDestroy) can be +executed in this pool. + +Defaults to @samp{5}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} integer max-requests +Total global limit on concurrent RPC calls. + +Defaults to @samp{20}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} integer max-client-requests +Limit on concurrent requests from a single client connection. To avoid +one client monopolizing the server this should be a small fraction of +the global max_requests and max_workers parameter. + +Defaults to @samp{5}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} integer admin-min-workers +Same as @code{min-workers} but for the admin interface. + +Defaults to @samp{1}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} integer admin-max-workers +Same as @code{max-workers} but for the admin interface. + +Defaults to @samp{5}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} integer admin-max-clients +Same as @code{max-clients} but for the admin interface. + +Defaults to @samp{5}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} integer admin-max-queued-clients +Same as @code{max-queued-clients} but for the admin interface. + +Defaults to @samp{5}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} integer admin-max-client-requests +Same as @code{max-client-requests} but for the admin interface. + +Defaults to @samp{5}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} integer log-level +Logging level. 4 errors, 3 warnings, 2 information, 1 debug. + +Defaults to @samp{3}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} string log-filters +Logging filters. + +A filter allows to select a different logging level for a given category +of logs The format for a filter is one of: + +@itemize @bullet +@item +x:name + +@item +x:+name + +@end itemize + +where @code{name} is a string which is matched against the category +given in the @code{VIR_LOG_INIT()} at the top of each libvirt source +file, e.g., "remote", "qemu", or "util.json" (the name in the filter can +be a substring of the full category name, in order to match multiple +similar categories), the optional "+" prefix tells libvirt to log stack +trace for each message matching name, and @code{x} is the minimal level +where matching messages should be logged: + +@itemize @bullet +@item +1: DEBUG + +@item +2: INFO + +@item +3: WARNING + +@item +4: ERROR + +@end itemize + +Multiple filters can be defined in a single filters statement, they just +need to be separated by spaces. + +Defaults to @samp{"3:remote 4:event"}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} string log-outputs +Logging outputs. + +An output is one of the places to save logging information The format +for an output can be: + +@table @code +@item x:stderr +output goes to stderr + +@item x:syslog:name +use syslog for the output and use the given name as the ident + +@item x:file:file_path +output to a file, with the given filepath + +@item x:journald +output to journald logging system + +@end table + +In all case the x prefix is the minimal level, acting as a filter + +@itemize @bullet +@item +1: DEBUG + +@item +2: INFO + +@item +3: WARNING + +@item +4: ERROR + +@end itemize + +Multiple outputs can be defined, they just need to be separated by +spaces. + +Defaults to @samp{"3:stderr"}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} integer audit-level +Allows usage of the auditing subsystem to be altered + +@itemize @bullet +@item +0: disable all auditing + +@item +1: enable auditing, only if enabled on host + +@item +2: enable auditing, and exit if disabled on host. + +@end itemize + +Defaults to @samp{1}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} boolean audit-logging +Send audit messages via libvirt logging infrastructure. + +Defaults to @samp{#f}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} optional-string host-uuid +Host UUID. UUID must not have all digits be the same. + +Defaults to @samp{""}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} string host-uuid-source +Source to read host UUID. + +@itemize @bullet +@item +@code{smbios}: fetch the UUID from @code{dmidecode -s system-uuid} + +@item +@code{machine-id}: fetch the UUID from @code{/etc/machine-id} + +@end itemize + +If @code{dmidecode} does not provide a valid UUID a temporary UUID will +be generated. + +Defaults to @samp{"smbios"}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} integer keepalive-interval +A keepalive message is sent to a client after @code{keepalive_interval} +seconds of inactivity to check if the client is still responding. If +set to -1, libvirtd will never send keepalive requests; however clients +can still send them and the daemon will send responses. + +Defaults to @samp{5}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} integer keepalive-count +Maximum number of keepalive messages that are allowed to be sent to the +client without getting any response before the connection is considered +broken. + +In other words, the connection is automatically closed approximately +after @code{keepalive_interval * (keepalive_count + 1)} seconds since +the last message received from the client. When @code{keepalive-count} +is set to 0, connections will be automatically closed after +@code{keepalive-interval} seconds of inactivity without sending any +keepalive messages. + +Defaults to @samp{5}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} integer admin-keepalive-interval +Same as above but for admin interface. + +Defaults to @samp{5}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} integer admin-keepalive-count +Same as above but for admin interface. + +Defaults to @samp{5}. + +@end deftypevr + +@deftypevr {@code{libvirt-configuration} parameter} integer ovs-timeout +Timeout for Open vSwitch calls. + +The @code{ovs-vsctl} utility is used for the configuration and its +timeout option is set by default to 5 seconds to avoid potential +infinite waits blocking libvirt. + +Defaults to @samp{5}. + +@end deftypevr + +@c %end of autogenerated docs + +@subsubheading Virtlog daemon +The virtlogd service is a server side daemon component of libvirt that is +used to manage logs from virtual machine consoles. + +This daemon is not used directly by libvirt client applications, rather it +is called on their behalf by @code{libvirtd}. By maintaining the logs in a +standalone daemon, the main @code{libvirtd} daemon can be restarted without +risk of losing logs. The @code{virtlogd} daemon has the ability to re-exec() +itself upon receiving @code{SIGUSR1}, to allow live upgrades without downtime. + +@deffn {Scheme Variable} virtlog-service-type +This is the type of the virtlog daemon. +Its value must be a @code{virtlog-configuration}. + +@example +(service virtlog-service-type + (virtlog-configuration + (max-clients 1000))) +@end example +@end deffn + +@deftypevr {@code{virtlog-configuration} parameter} integer log-level +Logging level. 4 errors, 3 warnings, 2 information, 1 debug. + +Defaults to @samp{3}. + +@end deftypevr + +@deftypevr {@code{virtlog-configuration} parameter} string log-filters +Logging filters. + +A filter allows to select a different logging level for a given category +of logs The format for a filter is one of: + +@itemize @bullet +@item +x:name + +@item +x:+name + +@end itemize + +where @code{name} is a string which is matched against the category +given in the @code{VIR_LOG_INIT()} at the top of each libvirt source +file, e.g., "remote", "qemu", or "util.json" (the name in the filter can +be a substring of the full category name, in order to match multiple +similar categories), the optional "+" prefix tells libvirt to log stack +trace for each message matching name, and @code{x} is the minimal level +where matching messages should be logged: + +@itemize @bullet +@item +1: DEBUG + +@item +2: INFO + +@item +3: WARNING + +@item +4: ERROR + +@end itemize + +Multiple filters can be defined in a single filters statement, they just +need to be separated by spaces. + +Defaults to @samp{"3:remote 4:event"}. + +@end deftypevr + +@deftypevr {@code{virtlog-configuration} parameter} string log-outputs +Logging outputs. + +An output is one of the places to save logging information The format +for an output can be: + +@table @code +@item x:stderr +output goes to stderr + +@item x:syslog:name +use syslog for the output and use the given name as the ident + +@item x:file:file_path +output to a file, with the given filepath + +@item x:journald +output to journald logging system + +@end table + +In all case the x prefix is the minimal level, acting as a filter + +@itemize @bullet +@item +1: DEBUG + +@item +2: INFO + +@item +3: WARNING + +@item +4: ERROR + +@end itemize + +Multiple outputs can be defined, they just need to be separated by +spaces. + +Defaults to @samp{"3:stderr"}. + +@end deftypevr + +@deftypevr {@code{virtlog-configuration} parameter} integer max-clients +Maximum number of concurrent client connections to allow over all +sockets combined. + +Defaults to @samp{1024}. + +@end deftypevr + +@deftypevr {@code{virtlog-configuration} parameter} integer max-size +Maximum file size before rolling over. + +Defaults to @samp{2MB} + +@end deftypevr + +@deftypevr {@code{virtlog-configuration} parameter} integer max-backups +Maximum number of backup files to keep. + +Defaults to @samp{3} + +@end deftypevr + + @node Miscellaneous Services @subsubsection Miscellaneous Services |