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50 lines
1.8 KiB
Markdown
50 lines
1.8 KiB
Markdown
Automated script
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===========
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## Overview
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The document describes the "automated script" functionality and some use cases. I assume
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you have basic knowledge of iPxe/pxe booting. Please see the following link for more documentaion regarding iPxe:
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http://ipxe.org/
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## Summary
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Automated script allows you to run an arbitrary script as a boot parameter. The script
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parses `/proc/cmdline` for `script` variable and download the script if its either
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an ftp or http uri. This method is used by Archlinux to install unattendedly. Please see the
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following link for reference:
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https://projects.archlinux.org/archiso.git/tree/configs/releng/airootfs/root/.automated_script.sh
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## Usecase
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Lets say you want to run boot2docker on multiple physical machines and you want run hashicorp/consul
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on all machines. You boot the machine via ipxe and add `script` as a parameter. The script you
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use could take information from the host as an identifier and announce itself using that information.
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## Extracting initrd and vmlinuz64
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You mount the iso and the files are located in `/boot`.
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## Extracting boot parameters
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Extracting the parameters and adjusting these will help you boot and provision using iPxe. It will also
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help you understand how boot2docker is being run currently.
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```
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root@896569876a97:/# cat /proc/cmdline
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loglevel=3 user=docker console=ttyS0 console=tty0 noembed nomodeset norestore waitusb=10:LABEL=boot2docker-data base initrd=/boot/initrd.img BOOT_IMAGE=/boot/vmlinuz64
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```
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## iPxe example
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```
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#!ipxe
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set script http://192.168.3.3:4321/repo/script.sh
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set append loglevel=3 user=docker console=ttyS0 console=tty nomodeset norestore base script=${script}
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set kernel http://192.168.3.3:4321/repo/vmlinuz64
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set initrd http://192.168.3.3:4321/repo/initrd.img
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imgfree
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kernel ${kernel} ${append}
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initrd ${initrd}
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boot
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```
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