packer-cn/website/pages/partials/common/bootcommand/BootConfig.mdx

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<!-- Code generated from the comments of the BootConfig struct in common/bootcommand/config.go; DO NOT EDIT MANUALLY -->
The boot configuration is very important: `boot_command` specifies the keys
to type when the virtual machine is first booted in order to start the OS
installer. This command is typed after boot_wait, which gives the virtual
machine some time to actually load.
The boot_command is an array of strings. The strings are all typed in
sequence. It is an array only to improve readability within the template.
There are a set of special keys available. If these are in your boot
command, they will be replaced by the proper key:
- `<bs>` - Backspace
- `<del>` - Delete
- `<enter> <return>` - Simulates an actual "enter" or "return" keypress.
- `<esc>` - Simulates pressing the escape key.
- `<tab>` - Simulates pressing the tab key.
- `<f1> - <f12>` - Simulates pressing a function key.
- `<up> <down> <left> <right>` - Simulates pressing an arrow key.
- `<spacebar>` - Simulates pressing the spacebar.
- `<insert>` - Simulates pressing the insert key.
- `<home> <end>` - Simulates pressing the home and end keys.
- `<pageUp> <pageDown>` - Simulates pressing the page up and page down
keys.
- `<menu>` - Simulates pressing the Menu key.
- `<leftAlt> <rightAlt>` - Simulates pressing the alt key.
- `<leftCtrl> <rightCtrl>` - Simulates pressing the ctrl key.
- `<leftShift> <rightShift>` - Simulates pressing the shift key.
- `<leftSuper> <rightSuper>` - Simulates pressing the ⌘ or Windows key.
- `<wait> <wait5> <wait10>` - Adds a 1, 5 or 10 second pause before
sending any additional keys. This is useful if you have to generally
wait for the UI to update before typing more.
- `<waitXX>` - Add an arbitrary pause before sending any additional keys.
The format of `XX` is a sequence of positive decimal numbers, each with
optional fraction and a unit suffix, such as `300ms`, `1.5h` or `2h45m`.
Valid time units are `ns`, `us` (or `µs`), `ms`, `s`, `m`, `h`. For
example `<wait10m>` or `<wait1m20s>`.
- `<XXXOn> <XXXOff>` - Any printable keyboard character, and of these
"special" expressions, with the exception of the `<wait>` types, can
also be toggled on or off. For example, to simulate ctrl+c, use
`<leftCtrlOn>c<leftCtrlOff>`. Be sure to release them, otherwise they
will be held down until the machine reboots. To hold the `c` key down,
you would use `<cOn>`. Likewise, `<cOff>` to release.
- `{{ .HTTPIP }} {{ .HTTPPort }}` - The IP and port, respectively of an
HTTP server that is started serving the directory specified by the
`http_directory` configuration parameter. If `http_directory` isn't
specified, these will be blank!
- `{{ .Name }}` - The name of the VM.
Example boot command. This is actually a working boot command used to start an
CentOS 6.4 installer:
```json
"boot_command": [
"<tab><wait>",
" ks=http://{{ .HTTPIP }}:{{ .HTTPPort }}/centos6-ks.cfg<enter>"
]
```
The example shown below is a working boot command used to start an Ubuntu
12.04 installer:
```json
[
"<esc><esc><enter><wait>",
"/install/vmlinuz noapic ",
"preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/preseed.cfg ",
"debian-installer=en_US auto locale=en_US kbd-chooser/method=us ",
"hostname={{ .Name }} ",
"fb=false debconf/frontend=noninteractive ",
"keyboard-configuration/modelcode=SKIP keyboard-configuration/layout=USA ",
"keyboard-configuration/variant=USA console-setup/ask_detect=false ",
"initrd=/install/initrd.gz -- <enter>"
]
```
For more examples of various boot commands, see the sample projects from our
[community templates page](/community-tools#templates).