Initramfs init: Difference between revisions

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(Created page with "== initramfs init cmdline options == The init script in the initramfs which is loaded by the kernel understands the following entires in your kernel command line: * quiet (f...")
 
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== initramfs init cmdline options ==
{{draft}}


The init script in the initramfs which is loaded by the kernel understands the following entires in your kernel command line:
== initramfs init cmdline options (work in progress) ==
 
In addition to the [https://www.kernel.org/doc/html/v4.14/admin-guide/kernel-parameters.html kernel boot parameters] are a number of parameters that the init script understands.
 
Although you may specify your own init script when building an initramfs, these parameters allow for extensive control over the initial startup of an Alpine Linux system.
 
<code>quiet</code> : less verbose init script execution
 
<code>debug_init</code> : sets '-x' in the init script and -d for mdev
 
<code>chart</code> : Enables bootchartd for measuring system startup speed.
 
<code>ip=dhcp</code> : use DHCP for network configuration.
 
<code>ip=client-ip:server-ip:gw-ip:netmask:hostname:device:autoconf:dns1:dns2</code> : use static IP configuration, each field is separated by a colon <code>:</code>
* <code>client-ip</code> ip address of the guest VM where we are going to run the installer
* <code>server-ip</code> not used, leave blank or fill with <code>none</code>
* <code>gw-ip</code>    the gateway ip address
* <code>netmask</code>  the netmask
* <code>hostname</code>  not used, leave blank or fill with <code>none</code>
* <code>device</code>    the network interface of the guest VM, default is <code>eth0</code> if left blank
* <code>autoconf</code>  not used, leave blank or fill with <code>none</code> or <code>off</code>
* <code>dns1</code>      address of the DNS server
* <code>dns2</code>      address of the 2nd DNS server
 
<code>modloop=URL</code> : the remote location of the image containing kernel's modules, required for LVM and raid setup.
 
:The remote location of the <code>modloop</code> image is the same as the kernel and initramfs (see below).
 
<code>blacklist=MODULE{,MODULE}</code> : This comma-separated list names kernel modules that modprobe will reject to load.
 
<code>alpine_repo=URL</code> : the location of the Alpine repository from which packages are downloaded.
 
:For stable release, use <code>http://dl-cdn.alpinelinux.org/alpine/v3.9/main</code>
 
:For rolling release, use <code>http://dl-cdn.alpinelinux.org/alpine/edge/main</code>
 
<code>ssh_key=URL</code> : the remote location of your SSH public key. It will be added to root's authorized_keys. Also triggers OpenSSH-server to be installed and started.
 
<code>apkovl=URL</code> : Unpack the APK Overlay file from this URL. Happens immediately after network is up . This option will set the default  for service install and setup to false. (see .default_boot_services).
 
(work in progress)
 
* init=
* init_args=


* quiet (flag)
* chart (flag)
* alpine_repo=
* blacklist=
* apkovl=
* dasd=
* dasd=
* s390x_net=
* s390x_net=
Line 21: Line 60:
* resume
* resume
* rootflags
* rootflags
* init=
* init_args=
* usbdelay
* usbdelay
* pkgs=
* pkgs=
Line 28: Line 65:
* keep_apk_new
* keep_apk_new
* splash=
* splash=
*
* ...
 
 
[[category:Kernel]]

Revision as of 07:39, 14 September 2019

This material is work-in-progress ...

Do not follow instructions here until this notice is removed.
(Last edited by Innsill on 14 Sep 2019.)

initramfs init cmdline options (work in progress)

In addition to the kernel boot parameters are a number of parameters that the init script understands.

Although you may specify your own init script when building an initramfs, these parameters allow for extensive control over the initial startup of an Alpine Linux system.

quiet : less verbose init script execution

debug_init : sets '-x' in the init script and -d for mdev

chart : Enables bootchartd for measuring system startup speed.

ip=dhcp : use DHCP for network configuration.

ip=client-ip:server-ip:gw-ip:netmask:hostname:device:autoconf:dns1:dns2 : use static IP configuration, each field is separated by a colon :

  • client-ip ip address of the guest VM where we are going to run the installer
  • server-ip not used, leave blank or fill with none
  • gw-ip the gateway ip address
  • netmask the netmask
  • hostname not used, leave blank or fill with none
  • device the network interface of the guest VM, default is eth0 if left blank
  • autoconf not used, leave blank or fill with none or off
  • dns1 address of the DNS server
  • dns2 address of the 2nd DNS server

modloop=URL : the remote location of the image containing kernel's modules, required for LVM and raid setup.

The remote location of the modloop image is the same as the kernel and initramfs (see below).

blacklist=MODULE{,MODULE} : This comma-separated list names kernel modules that modprobe will reject to load.

alpine_repo=URL : the location of the Alpine repository from which packages are downloaded.

For stable release, use http://dl-cdn.alpinelinux.org/alpine/v3.9/main
For rolling release, use http://dl-cdn.alpinelinux.org/alpine/edge/main

ssh_key=URL : the remote location of your SSH public key. It will be added to root's authorized_keys. Also triggers OpenSSH-server to be installed and started.

apkovl=URL : Unpack the APK Overlay file from this URL. Happens immediately after network is up . This option will set the default for service install and setup to false. (see .default_boot_services).

(work in progress)

  • init=
  • init_args=
  • dasd=
  • s390x_net=
  • rootfstype=
  • modules=
  • crytptroot=
  • cryptdm=
  • cryptheader=
  • cryptoffset=
  • cryptokey=
  • nbd=
  • root=
  • resume
  • rootflags
  • usbdelay
  • pkgs=
  • ssh_key=
  • keep_apk_new
  • splash=
  • ...
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