diff options
Diffstat (limited to 'man/systemd-vmspawn.xml')
| -rw-r--r-- | man/systemd-vmspawn.xml | 475 |
1 files changed, 417 insertions, 58 deletions
diff --git a/man/systemd-vmspawn.xml b/man/systemd-vmspawn.xml index 9bec440..19dce8a 100644 --- a/man/systemd-vmspawn.xml +++ b/man/systemd-vmspawn.xml @@ -1,6 +1,9 @@ <?xml version='1.0'?> <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" - "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> + "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [ +<!ENTITY % entities SYSTEM "custom-entities.ent" > +%entities; +]> <!-- SPDX-License-Identifier: LGPL-2.1-or-later --> <refentry id="systemd-vmspawn" conditional="ENABLE_VMSPAWN" @@ -31,11 +34,19 @@ <refsect1> <title>Description</title> - <para><command>systemd-vmspawn</command> may be used to start a virtual machine from an OS image. In many ways it is similar to <citerefentry - project='man-pages'><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>, but it + <para><command>systemd-vmspawn</command> may be used to start a virtual machine from an OS image. In many ways it is similar to <citerefentry> + <refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>, but launches a full virtual machine instead of using namespaces.</para> - <para>Note: on Ubuntu/Debian derivatives systemd-vmspawn requires the user to be in the <literal>kvm</literal> group to use the VSock options.</para> + <para>File descriptors for <filename>/dev/kvm</filename> and <filename>/dev/vhost-vsock</filename> can be + passed to <command>systemd-vmspawn</command> via systemd's native socket passing interface (see + <citerefentry><refentrytitle>sd_listen_fds</refentrytitle><manvolnum>3</manvolnum></citerefentry> for + details about the precise protocol used and the order in which the file descriptors are passed), these + file descriptors must be passed with the names <literal>kvm</literal> and <literal>vhost-vsock</literal> + respectively.</para> + + <para>Note: on Ubuntu/Debian derivatives systemd-vmspawn requires the user to be in the + <literal>kvm</literal> group to use the VSOCK options.</para> </refsect1> <refsect1> @@ -45,11 +56,43 @@ <para>The following options are understood:</para> + <variablelist> + + <varlistentry> + <term><option>-q</option></term> + <term><option>--quiet</option></term> + + <listitem><para>Turns off any status output by the tool + itself. When this switch is used, the only output from vmspawn + will be the console output of the Virtual Machine OS itself.</para> + + <xi:include href="version-info.xml" xpointer="v256"/></listitem> + </varlistentry> + + </variablelist> + <refsect2> <title>Image Options</title> <variablelist> <varlistentry> + <term><option>-D</option></term> + <term><option>--directory=</option></term> + + <listitem><para>Directory to use as file system root for the virtual machine.</para> + + <para>One of either <option>--directory=</option> or <option>--image=</option> must be specified. + If neither are specified <option>--directory=.</option> is assumed.</para> + + <para>Note: If mounting a non-root owned directory you may require <option>--private-users=</option> + to map into the user's subuid namespace. An example of how to use <constant>/etc/subuid</constant> + for this is given later.</para> + + <xi:include href="version-info.xml" xpointer="v256"/> + </listitem> + </varlistentry> + + <varlistentry> <term><option>-i</option></term> <term><option>--image=</option></term> @@ -66,9 +109,9 @@ <variablelist> <varlistentry> - <term><option>--qemu-smp=</option><replaceable>SMP</replaceable></term> + <term><option>--cpus=<replaceable>CPUS</replaceable></option></term> - <listitem><para>Configures the number of CPUs to start the virtual machine with. + <listitem><para>The number of CPUs to start the virtual machine with. Defaults to 1.</para> <xi:include href="version-info.xml" xpointer="v255"/> @@ -76,68 +119,156 @@ </varlistentry> <varlistentry> - <term><option>--qemu-mem=</option><replaceable>MEM</replaceable></term> + <term><option>--ram=<replaceable>BYTES</replaceable></option></term> - <listitem><para>Configures the amount of memory to start the virtual machine with. + <listitem><para>The amount of memory to start the virtual machine with. Defaults to 2G.</para> <xi:include href="version-info.xml" xpointer="v255"/> </listitem> </varlistentry> - <varlistentry> - <term><option>--qemu-kvm=</option><replaceable>BOOL</replaceable></term> + <varlistentry> + <term><option>--kvm=<replaceable>BOOL</replaceable></option></term> - <listitem><para>Configures whether to use KVM. If the option is not specified KVM support will be - detected automatically. If true, KVM is always used, and if false, KVM is never used.</para> + <listitem><para>If <option>--kvm=</option> is not specified KVM support will be + detected automatically. If true, KVM is always used, and if false, KVM is never used.</para> - <xi:include href="version-info.xml" xpointer="v255"/></listitem> - </varlistentry> + <xi:include href="version-info.xml" xpointer="v255"/></listitem> + </varlistentry> - <varlistentry> - <term><option>--qemu-vsock=</option><replaceable>BOOL</replaceable></term> + <varlistentry> + <term><option>--vsock=<replaceable>BOOL</replaceable></option></term> - <listitem> - <para>Configure whether to use VSock networking.</para> - <para>If the option is not specified VSock support will be detected automatically. - If yes is specified VSocks are always used, and vice versa if no is set VSocks are never used.</para> - <xi:include href="version-info.xml" xpointer="v255"/> - </listitem> - </varlistentry> + <listitem><para>If <option>--vsock=</option> is not specified VSOCK networking support will be + detected automatically. If true, VSOCK networking is always used, and if false, VSOCK networking is never used.</para> - <varlistentry> - <term><option>--vsock-cid=</option><replaceable>CID</replaceable></term> + <xi:include href="version-info.xml" xpointer="v255"/></listitem> + </varlistentry> - <listitem> - <para>Configure vmspawn to use a specific CID for the guest.</para> - <para>If the option is not specified or an empty argument is supplied the guest will be assigned a random CID.</para> - <para>Valid CIDs are in the range <constant>3</constant> to <constant>4294967294</constant> (<constant>0xFFFF_FFFE</constant>). - CIDs outside of this range are reserved.</para> - <xi:include href="version-info.xml" xpointer="v255"/> - </listitem> - </varlistentry> + <varlistentry> + <term><option>--vsock-cid=<replaceable>CID</replaceable></option></term> - <varlistentry> - <term><option>--qemu-gui</option></term> + <listitem> + <para>Sets the specific CID to use for the guest. + Valid CIDs are in the range <constant>3</constant> to <constant>4294967294</constant> (<constant>0xFFFF_FFFE</constant>). + CIDs outside of this range are reserved. By default vmspawn will attempt to derive a CID for the guest derived from the machine name, + falling back to a random CID if this CID is taken.</para> - <listitem><para>Start QEMU in graphical mode.</para> + <xi:include href="version-info.xml" xpointer="v255"/> + </listitem> + </varlistentry> - <xi:include href="version-info.xml" xpointer="v255"/></listitem> - </varlistentry> + <varlistentry> + <term><option>--tpm=<replaceable>BOOL</replaceable></option></term> - <varlistentry> - <term><option>--secure-boot=</option><replaceable>BOOL</replaceable></term> + <listitem> + <para>If <option>--tpm=</option> is not specified vmspawn will detect the presence of <citerefentry project='debian'> + <refentrytitle>swtpm</refentrytitle><manvolnum>8</manvolnum></citerefentry> and use it if available. + If yes is specified <citerefentry project='debian'><refentrytitle>swtpm</refentrytitle><manvolnum>8</manvolnum></citerefentry> + is always used, and if no is set <citerefentry project='debian'><refentrytitle>swtpm</refentrytitle> + <manvolnum>8</manvolnum></citerefentry> is never used.</para> - <listitem><para>Configure whether to search for firmware which supports Secure Boot.</para> - <para>If the option is not specified the first firmware which is detected will be used. - If the option is set to yes then the first firmware with Secure Boot support will be selected. - If no is specified then the first firmware without Secure Boot will be selected.</para> + <para>Note: the virtual TPM used may change in future.</para> - <xi:include href="version-info.xml" xpointer="v255"/></listitem> - </varlistentry> - </variablelist> + <xi:include href="version-info.xml" xpointer="v256"/> + </listitem> + </varlistentry> - </refsect2><refsect2> + <varlistentry> + <term><option>--linux=<replaceable>PATH</replaceable></option></term> + + <listitem> + <para>Set the linux kernel image to use for direct kernel boot. + If a directory type image is used and <option>--linux=</option> was omitted, vmspawn will search for boot loader entries + according to the + <ulink url="https://uapi-group.org/specifications/specs/boot_loader_specification">Boot Loader Specification</ulink> assuming + XBOOTLDR to be located at /boot and ESP to be /efi respectively. + If no kernel was installed into the image then the image will fail to boot.</para> + + <xi:include href="version-info.xml" xpointer="v256"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><option>--initrd=<replaceable>PATH</replaceable></option></term> + + <listitem> + <para>Set the initrd to use for direct kernel boot. + If the <option>--linux=</option> supplied is a + <ulink url="https://uapi-group.org/specifications/specs/boot_loader_specification">Boot Loader Specification</ulink> + Type #2 entry, then this argument is not required. + If no initrd was installed into the image then the image will fail to boot.</para> + + <para><option>--initrd=</option> can be specified multiple times and vmspawn will merge them together.</para> + + <xi:include href="version-info.xml" xpointer="v256"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><option>-n</option></term> + <term><option>--network-tap</option></term> + + <listitem> + <para>Create a TAP device to network with the virtual machine.</para> + + <para>Note: root privileges are required to use TAP networking. + Additionally, + <citerefentry><refentrytitle>systemd-networkd</refentrytitle><manvolnum>8</manvolnum></citerefentry> + must be running and correctly set up on the host to provision the host interface. The relevant + <literal>.network</literal> file can be found at + <filename>/usr/lib/systemd/network/80-vm-vt.network</filename>. + </para> + + <xi:include href="version-info.xml" xpointer="v255"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><option>--network-user-mode</option></term> + + <listitem><para>Use user mode networking.</para> + + <xi:include href="version-info.xml" xpointer="v255"/></listitem> + </varlistentry> + + <varlistentry> + <term><option>--firmware=<replaceable>PATH</replaceable></option></term> + + <listitem><para>Takes an absolute path, or a relative path beginning with + <filename>./</filename>. Specifies a JSON firmware definition file, which allows selecting the + firmware to boot in the VM. If not specified a suitable firmware is automatically discovered. If the + special string <literal>list</literal> is specified lists all discovered firmwares.</para> + + <xi:include href="version-info.xml" xpointer="v256"/></listitem> + </varlistentry> + + <varlistentry> + <term><option>--discard-disk=<replaceable>BOOL</replaceable></option></term> + + <listitem><para>Controls whether qemu processes discard requests from the VM. + This prevents long running VMs from using more disk space than required. + This is enabled by default.</para> + + <xi:include href="version-info.xml" xpointer="v256"/></listitem> + </varlistentry> + + <varlistentry> + <term><option>--secure-boot=<replaceable>BOOL</replaceable></option></term> + + <listitem><para>Configure whether to search for firmware which supports Secure Boot.</para> + + <para>If the option is not specified the first firmware which is detected will be used. + If the option is set to yes then the first firmware with Secure Boot support will be selected. + If no is specified then the first firmware without Secure Boot will be selected.</para> + + <xi:include href="version-info.xml" xpointer="v255"/></listitem> + </varlistentry> + </variablelist> + </refsect2> + + <refsect2> <title>System Identity Options</title> <variablelist> @@ -145,25 +276,203 @@ <term><option>-M</option></term> <term><option>--machine=</option></term> - <listitem><para>Sets the machine name for this container. This - name may be used to identify this container during its runtime + <listitem><para>Sets the machine name for this virtual machine. This + name may be used to identify this virtual machine during its runtime (for example in tools like <citerefentry><refentrytitle>machinectl</refentrytitle><manvolnum>1</manvolnum></citerefentry> and similar).</para> + <xi:include href="version-info.xml" xpointer="v255"/> </listitem> </varlistentry> + + <varlistentry> + <term><option>--uuid=</option></term> + + <listitem><para>Set the specified UUID for the virtual machine. The + init system will initialize + <filename>/etc/machine-id</filename> from this if this file is + not set yet. Note that this option takes effect only if + <filename>/etc/machine-id</filename> in the virtual machine is + unpopulated.</para> + + <xi:include href="version-info.xml" xpointer="v256"/></listitem> + </varlistentry> </variablelist> + </refsect2> - </refsect2><refsect2> + <refsect2> + <title>Property Options</title> + + <variablelist> + <varlistentry> + <term><option>--register=</option></term> + + <listitem><para>Controls whether the virtual machine is registered with + <citerefentry><refentrytitle>systemd-machined</refentrytitle><manvolnum>8</manvolnum></citerefentry>. Takes a + boolean argument, which defaults to <literal>yes</literal> when running as root, and <literal>no</literal> when + running as a regular user. This ensures that the virtual machine is accessible via + <citerefentry><refentrytitle>machinectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para> + + <para>Note: root privileges are required to use this option as registering with + <citerefentry><refentrytitle>systemd-machined</refentrytitle><manvolnum>8</manvolnum></citerefentry> + requires privileged D-Bus method calls.</para> + + <xi:include href="version-info.xml" xpointer="v256"/></listitem> + </varlistentry> + </variablelist> + </refsect2> + + <refsect2> + <title>User Namespacing Options</title> + + <variablelist> + <varlistentry> + <term><option>--private-users=<replaceable>UID_SHIFT[:UID_RANGE]</replaceable></option></term> + + <listitem><para>Controls user namespacing under <option>--directory=</option>. + If enabled, + <citerefentry><refentrytitle>virtiofsd</refentrytitle><manvolnum>1</manvolnum></citerefentry> + is instructed to map user and group ids (UIDs and GIDs). + This involves mapping the private UIDs/GIDs used in the virtual machine (starting with the virtual machine's + root user 0 and up) to a range of UIDs/GIDs on the host that are not used for other purposes (usually in the + range beyond the host's UID/GID 65536).</para> + + <para>If one or two colon-separated numbers are specified, user namespacing is turned on. <replaceable>UID_SHIFT</replaceable> + specifies the first host UID/GID to map, <replaceable>UID_RANGE</replaceable> is optional and specifies number of host + UIDs/GIDs to assign to the virtual machine. If <replaceable>UID_RANGE</replaceable> is omitted, 65536 UIDs/GIDs are assigned.</para> + + <para>When user namespaces are used, the GID range assigned to each virtual machine is always chosen identical to the + UID range.</para> + + <xi:include href="version-info.xml" xpointer="v256"/></listitem> + </varlistentry> + </variablelist> + </refsect2> + + <refsect2> + <title>Mount Options</title> + + <variablelist> + + <varlistentry> + <term><option>--bind=<replaceable>PATH</replaceable></option></term> + <term><option>--bind-ro=<replaceable>PATH</replaceable></option></term> + + <listitem><para>Mount a directory from the host into the virtual machine. Takes one of: a path + argument — in which case the specified path will be mounted from the host to the same path in the virtual machine, or + a colon-separated pair of paths — in which case the first specified path is the source in the host, and the + second path is the destination in the virtual machine. If the source path is not absolute, it is resolved + relative to the current working directory. The <option>--bind-ro=</option> option creates read-only bind mounts. + Backslash escapes are interpreted, so <literal>\:</literal> may be used to embed colons in either path. + This option may be specified multiple times for creating multiple independent bind mount points.</para> + + <xi:include href="version-info.xml" xpointer="v256"/></listitem> + </varlistentry> + + <varlistentry> + <term><option>--extra-drive=<replaceable>PATH</replaceable></option></term> + + <listitem><para>Takes a disk image or block device on the host and supplies it to the virtual machine as another drive.</para> + + <xi:include href="version-info.xml" xpointer="v256"/></listitem> + </varlistentry> + + </variablelist> + </refsect2> + + <refsect2> + <title>Integration Options</title> + + <variablelist> + <varlistentry> + <term><option>--forward-journal=<replaceable>FILE|DIR</replaceable></option></term> + + <listitem><para>Forward the virtual machine's journal to the host. + <citerefentry><refentrytitle>systemd-journal-remote</refentrytitle><manvolnum>8</manvolnum></citerefentry> + is currently used to receive the guest VM's forwarded journal entries. This option determines where + this journal is saved on the host and has the same semantics as + <option>-o</option>/<option>--output</option> described in + <citerefentry><refentrytitle>systemd-journal-remote</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> + + <xi:include href="version-info.xml" xpointer="v256"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><option>--pass-ssh-key=<replaceable>BOOL</replaceable></option></term> + + <listitem><para>By default an SSH key is generated to allow <command>systemd-vmspawn</command> to open + a D-Bus connection to the VM's systemd bus. Setting this to "no" will disable SSH key generation.</para> + + <para>The generated keys are ephemeral. That is they are valid only for the current invocation of <command>systemd-vmspawn</command>, + and are typically not persisted.</para> + + <xi:include href="version-info.xml" xpointer="v256"/> + </listitem> + </varlistentry> + + <varlistentry> + <term><option>--ssh-key-type=<replaceable>TYPE</replaceable></option></term> + + <listitem><para>Configures the type of SSH key to generate, see + <citerefentry project="man-pages"><refentrytitle>ssh-keygen</refentrytitle><manvolnum>1</manvolnum></citerefentry> + for more information.</para> + + <para>By default <literal>ed25519</literal> keys are generated, however <literal>rsa</literal> keys + may also be useful if the VM has a particularly old version of <command>sshd</command>.</para> + + <xi:include href="version-info.xml" xpointer="v256"/> + </listitem> + </varlistentry> + </variablelist> + </refsect2> + + <refsect2> + <title>Input/Output Options</title> + + <variablelist> + <varlistentry> + <term><option>--console=<replaceable>MODE</replaceable></option></term> + + <listitem><para>Configures how to set up the console of the VM. Takes one of + <literal>interactive</literal>, <literal>read-only</literal>, <literal>native</literal>, + <literal>gui</literal>. Defaults to <literal>interactive</literal>. <literal>interactive</literal> + provides an interactive terminal interface to the VM. <literal>read-only</literal> is similar, but + is strictly read-only, i.e. does not accept any input from the user. <literal>native</literal> also + provides a TTY-based interface, but uses qemu native implementation (which means the qemu monitor + is available). <literal>gui</literal> shows the qemu graphical UI.</para> + + <xi:include href="version-info.xml" xpointer="v256"/></listitem> + </varlistentry> + + <varlistentry> + <term><option>--background=<replaceable>COLOR</replaceable></option></term> + + <listitem><para>Change the terminal background color to the specified ANSI color as long as the VM + runs. The color specified should be an ANSI X3.64 SGR background color, i.e. strings such as + <literal>40</literal>, <literal>41</literal>, …, <literal>47</literal>, <literal>48;2;…</literal>, + <literal>48;5;…</literal>. See <ulink + url="https://en.wikipedia.org/wiki/ANSI_escape_code#SGR_(Select_Graphic_Rendition)_parameters">ANSI + Escape Code (Wikipedia)</ulink> for details. Assign an empty string to disable any coloring. This + only has an effect in <option>--console=interactive</option> and + <option>--console=read-only</option> modes.</para> + + <xi:include href="version-info.xml" xpointer="v256"/> + </listitem> + </varlistentry> + </variablelist> + </refsect2> + + <refsect2> <title>Credentials</title> <variablelist> <varlistentry> - <term><option>--load-credential=</option><replaceable>ID</replaceable>:<replaceable>PATH</replaceable></term> - <term><option>--set-credential=</option><replaceable>ID</replaceable>:<replaceable>VALUE</replaceable></term> + <term><option>--load-credential=<replaceable>ID</replaceable>:<replaceable>PATH</replaceable></option></term> + <term><option>--set-credential=<replaceable>ID</replaceable>:<replaceable>VALUE</replaceable></option></term> - <listitem><para>Pass a credential to the container. These two options correspond to the + <listitem><para>Pass a credential to the virtual machine. These two options correspond to the <varname>LoadCredential=</varname> and <varname>SetCredential=</varname> settings in unit files. See <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry> for details about these concepts, as well as the syntax of the option's arguments.</para> @@ -201,6 +510,53 @@ $ mkosi -d arch -p systemd -p linux --autologin -o image.raw -f build $ systemd-vmspawn --image=image.raw </programlisting> </example> + + <example> + <title>Import and run a Fedora 39 Cloud image using machinectl</title> + + <programlisting> +$ curl -L \ + -O https://download.fedoraproject.org/pub/fedora/linux/releases/&fedora_latest_version;/Cloud/x86_64/images/Fedora-Cloud-Base-&fedora_latest_version;-&fedora_cloud_release;.x86_64.raw.xz \ + -O https://download.fedoraproject.org/pub/fedora/linux/releases/&fedora_latest_version;/Cloud/x86_64/images/Fedora-Cloud-&fedora_latest_version;-&fedora_cloud_release;-x86_64-CHECKSUM \ + -O https://fedoraproject.org/fedora.gpg +$ gpgv --keyring ./fedora.gpg Fedora-Cloud-&fedora_latest_version;-&fedora_cloud_release;-x86_64-CHECKSUM +$ sha256sum -c Fedora-Cloud-&fedora_latest_version;-&fedora_cloud_release;-x86_64-CHECKSUM +# machinectl import-raw Fedora-Cloud-Base-&fedora_latest_version;-&fedora_cloud_release;.x86_64.raw.xz fedora-&fedora_latest_version;-cloud +# systemd-vmspawn -M fedora-&fedora_latest_version;-cloud + </programlisting> + </example> + + <example> + <title>Build and run systemd's system image and forward the VM's journal to a local file</title> + + <programlisting> +$ mkosi build +$ systemd-vmspawn \ + -D mkosi.output/system \ + --private-users $(grep $(whoami) /etc/subuid | cut -d: -f2) \ + --linux mkosi.output/system.efi \ + --forward-journal=vm.journal \ + enforcing=0 + </programlisting> + + <para>Note: this example also uses a kernel command line argument to ensure SELinux isn't started in enforcing mode.</para> + </example> + + <example> + <title>SSH into a running VM using <command>systemd-ssh-proxy</command></title> + + <programlisting> +$ mkosi build +$ my_vsock_cid=3735928559 +$ systemd-vmspawn \ + -D mkosi.output/system \ + --private-users $(grep $(whoami) /etc/subuid | cut -d: -f2) \ + --linux mkosi.output/system.efi \ + --vsock-cid $my_vsock_cid \ + enforcing=0 +$ ssh root@vsock/$my_vsock_cid -i /run/user/$UID/systemd/vmspawn/machine-*-system-ed25519 + </programlisting> + </example> </refsect1> <refsect1> @@ -213,9 +569,12 @@ $ systemd-vmspawn --image=image.raw <refsect1> <title>See Also</title> - <para> - <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, - <citerefentry><refentrytitle>mkosi</refentrytitle><manvolnum>1</manvolnum></citerefentry> - </para> + <para><simplelist type="inline"> + <member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member> + <member><citerefentry project='debian'><refentrytitle>mkosi</refentrytitle><manvolnum>1</manvolnum></citerefentry></member> + <member><citerefentry><refentrytitle>machinectl</refentrytitle><manvolnum>1</manvolnum></citerefentry></member> + <member><citerefentry><refentrytitle>importctl</refentrytitle><manvolnum>1</manvolnum></citerefentry></member> + <member><ulink url="https://uapi-group.org/specifications/specs/boot_loader_specification">Boot Loader Specification</ulink></member> + </simplelist></para> </refsect1> </refentry> |