Zcrayfish: nowiki'd a dead link.

2023-08-28T01:51:44Z

nowiki'd a dead link.

← Older revision		Revision as of 01:51, 28 August 2023
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	see http://wiki.alpinelinux.org/wiki/User_talk:Jch#NFS_bug_study <br/>		see http://wiki.alpinelinux.org/wiki/User_talk:Jch#NFS_bug_study <br/>
	'''It is now working with''' http://dev.alpinelinux.org/~clandmeter/rpcbind-0.2.3_rc2-r0.apk		'''It is now working with''' <nowiki>http://dev.alpinelinux.org/~clandmeter/rpcbind-0.2.3_rc2-r0.apk</nowiki>

	We serve the content of an usb key (iso) in ro as <pre>		We serve the content of an usb key (iso) in ro as <pre>

Jch: /* Starting AL from network */

2015-04-19T20:01:05Z

Starting AL from network

← Older revision		Revision as of 20:01, 19 April 2015
Line 202:		Line 202:

	tinydns from repo with split-dns config.		tinydns from repo with split-dns config.

			=== dnsmasq ===

			This package pretends to be able to offer all-in-one... <br/>
			''to be investigated...''

Jch: /* tftp */

2015-04-19T00:10:01Z

tftp

← Older revision		Revision as of 00:10, 19 April 2015
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	LINUX alpine/vmlinuz-grsec		LINUX alpine/vmlinuz-grsec
	INITRD alpine/pxerd		INITRD alpine/pxerd
	APPEND ip=dhcp alpine_dev=nfs:192.168.1.3:/srv/boot/alpine modloop~~=/boot/grsec.modloop.squashfs nomodeset quiet apkovl~~=http://192.168.1.4/~~localhost.apkovl.tar.gz~~		APPEND ip=dhcp alpine_dev=nfs:192.168.1.3:/srv/boot/alpine modloop=http://192.168.1.4/modloop-grsec nomodeset quiet \
	~~#APPEND~~ modloop~~=http:/192.168.1.4/~~grsec~~.modloop.squashfs~~		apkovl="http://192.168.1.4/localhost.apkovl.tar.gz"
	~~#APPEND~~ apkovl=http://192.168.1.4/localhost.apkovl.tar.gz ~~# including the modloop hack~~
	~~#APPEND alpine_repo=http://repo-url~~
	</pre>		</pre>

Jch: /* dhcpd */

2015-04-18T23:57:55Z

dhcpd

← Older revision		Revision as of 23:57, 18 April 2015
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	</pre>		</pre>

			<s>
	and		and
	<pre>		<pre>
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	with a custom /usr/local/bin/dns-update-djb script largely inspired from https://sites.google.com/site/dmoulding/dns-update-djb but adapted for a distant tinydns server and to the AL way.		with a custom /usr/local/bin/dns-update-djb script largely inspired from https://sites.google.com/site/dmoulding/dns-update-djb but adapted for a distant tinydns server and to the AL way.
			</s>

			will be taken care by consul!

	==== tftp ====		==== tftp ====

Jch: /* PXE_boot */

2015-04-18T23:55:46Z

PXE_boot

← Older revision		Revision as of 23:55, 18 April 2015
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	We are trying to do something as in [[PXE_boot]].		We are trying to do something as in [[PXE_boot]].

	We did it on separate machine for each service. It forces us to deeply understand all interactions between processes.		We did it on separate machine for each service. It forces us to deeply understand all interactions between processes.<br/>
			But next one will be all-in-one KVM.

	In current state we <pre>umount /media/alpine</pre> as last step of the boot procees and we are running with no tie.		In current state we <pre>umount /media/alpine</pre> as last step of the boot procees and we are running with no tie.

Jch: Created page with "{{toc}} ==Starting AL from network== As it does not seems possible to start qemu with a virtual USB key and a virtual HDD attached to the VM. Let's try something different..."

2015-04-17T07:05:46Z

Created page with "{{toc}} ==Starting AL from network== As it does not seems possible to start qemu with a virtual USB key *and* a virtual HDD attached to the VM. Let's try something different..."

New page

{{toc}}

==Starting AL from network==

As it does not seems possible to start qemu with a virtual USB key *and* a virtual HDD attached to the VM. Let's try something different: to start AL from the network and mount the HDD later on...

Usually this kind of setup needs
* a DHCP server to get an IP address and the location of the TFTP server
* a TFTP server to download the kernel and tje root file system to boot from
* a NFS server or a HTTP one to get the overlay used to configure the machine
* a NFS server to share files with others
* a NBD server to get his own block devices as storage
* a machine where to prepare initramfs

First, let's check what is vailable in AL and what is not...
* dhcpcd-6.6.7-r0
* tftp-hpa-5.2-r1
* nfs-utils-1.3.1-r2
* darkhttpd-1.10-r1
* nbd-3-10-r0

=== PXE_boot ===

We are trying to do something as in [[PXE_boot]].

We did it on separate machine for each service. It forces us to deeply understand all interactions between processes.

In current state we <pre>umount /media/alpine</pre> as last step of the boot procees and we are running with no tie.

==== dhcpd ====

192.168.1.1

with package dhcp from repo. <s>Nothing special.</s>

<pre>
filename "pxelinux.0";
next-server 192.168.1.2;
</pre>

and
<pre>
# Disable RFC 2136 dynamic DNS updates.
ddns-update-style none;

# Define actions to take when leases are committed, released, or expired to
# accomplish dynamic DNS updates to djbdns. This does not use the RFC 2136
# update mechanism, because djbdns does not support it. However, it
# accomplishes the same thing.
# syntax "execute(cmd, arg, ...)"
### need to check if the two "on EVENT" must be nested or in sequence...
on commit {
execute ("/usr/local/bin/dns-update-djb",
"commit",
lcase (option host-name),
config-option domain-name,
binary-to-ascii (10, 8, ".", leased-address));
on release or expiry {
execute ("/usr/local/bin/dns-update-djb",
"release",
binary-to-ascii (10, 8, ".", leased-address));
}
}
</pre>

with a custom /usr/local/bin/dns-update-djb script largely inspired from https://sites.google.com/site/dmoulding/dns-update-djb but adapted for a distant tinydns server and to the AL way.

==== tftp ====

192.168.1.2

tftp-hpa configured to serve some SYSLINUX files.

The config is in /etc/conf.d/in.tftpd 
Then to issue:
<pre>
rc-update add in.tftpd
rc-service in.tftpd start
</pre>

We serve from /var/tftpboot.

We add to temporary install the syslinux apk to get pxelinix.0 and other libs needed. 
We did prepare a "pxerd" initramfs file with virtio_net.ko, dhcp and nfs included; made sure loop and squashfs are included. 
pxelinux.cfg/default looks like <pre>
PROMPT 0
TIMEOUT 3
default alpine
LABEL alpine
LINUX alpine/vmlinuz-grsec
INITRD alpine/pxerd
APPEND ip=dhcp alpine_dev=nfs:192.168.1.3:/srv/boot/alpine modloop=/boot/grsec.modloop.squashfs nomodeset quiet apkovl=http://192.168.1.4/localhost.apkovl.tar.gz
#APPEND modloop=http:/192.168.1.4/grsec.modloop.squashfs
#APPEND apkovl=http://192.168.1.4/localhost.apkovl.tar.gz # including the modloop hack
#APPEND alpine_repo=http://repo-url
</pre>

Modules are loaded <pre>
/ # lsmod
Module Size Used by Not tainted
nfsv3 22784 1
nfs 144376 2 nfsv3
lockd 71917 2 nfsv3,nfs
sunrpc 225574 6 nfsv3,nfs,lockd
af_packet 28735 0
sr_mod 13487 0
cdrom 40424 1 sr_mod
pata_acpi 3326 0
ata_piix 25601 0
ata_generic 3554 0
libata 181955 3 pata_acpi,ata_piix,ata_generic
virtio_net 19684 0
scsi_mod 113710 2 sr_mod,libata
virtio_pci 6485 0
virtio 4933 2 virtio_net,virtio_pci
virtio_ring 9161 2 virtio_net,virtio_pci
squashfs 25893 1
loop 18243 2
</pre> Network is up <pre>
/ # ifconfig
eth0 Link encap:Ethernet HWaddr 52:54:33:B0:C2:D2
inet addr:192.168.1.108 Bcast:0.0.0.0 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:322 errors:0 dropped:0 overruns:0 frame:0
TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:20514 (20.0 KiB) TX bytes:684 (684.0 B)
</pre> but modloop does not load

This patch fix this issue (hope to see it mainstream soon) <pre>
localhost:~# diff /etc/init.d/modloop modloop.new
--- /etc/init.d/modloop
+++ modloop.new
@@ -32,7 +32,7 @@
local search_dev="$1" fstab="$2"
local dev mnt fs mntopts chk
case "$search_dev" in
- UUID=*|LABEL=*|/dev/*);;
+ UUID=*|LABEL=*|/dev/*|nfs);;
*) search_dev=/dev/$search_dev;;
esac
local search_real_dev=$(resolve_dev $search_dev)
@@ -49,6 +49,10 @@
fi
done
done
+ if [ "$fs" = "$search_dev" ]; then
+ echo "$mnt"
+ return
+ fi
done < $fstab 2>/dev/null
}

</pre>

==== References ====

http://www.syslinux.org/wiki/index.php/PXELINUX

==== nfs ====

192.168.1.3

see http://wiki.alpinelinux.org/wiki/User_talk:Jch#NFS_bug_study 
'''It is now working with''' http://dev.alpinelinux.org/~clandmeter/rpcbind-0.2.3_rc2-r0.apk

We serve the content of an usb key (iso) in ro as <pre>
/srv/boot/alpine *(ro,no_root_squash,no_subtree_check)
</pre>

==== http ====

192.168.1.4

With package [[Darkhttpd]] from repo serving from /var/tftpboot/ to serve files needed to boot (kernel, rootfs, apkovl.tar.gz)

==== nbd ====

192.168.1.5

I really would like to have xnbd-server in AL. nbd-3.1.0 was just added to edge/testing repo; need to try it in real situation... 
For now, we have a qcow2 debian image added to the apkovl with lbu add; lbu ci. 
This image is used to launch a first KVM with /dev/mdX as second drive. 
In turn, inside the KVM, vdb is used to define a lvm2 volume. 
The LV are published with xnbd-server.

Later on, the same KVM will be able to connect to RBD device and re-publish it as NBD.

'''xnbd-server''' allows ''live migration'' of Block Devices while live. And has a powerfull ''proxy'' mode.

All other KVM are running from FS accessed trough NBD from such SAN. Even other SAN. 
As soon as those '''KVM-NBD''' are up, they may be used to launch others or to provide ''datastores''.

We put that image on every USB key we use along with mdadm and OpenVSwitch (and collectd).

==== dns ====

192.168.1.6

tinydns from repo with split-dns config.