User talk:Jch: Difference between revisions

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= NFS bug study =
== [[User_talk:Jch/How to automate KVM creation|How to automate KVM creation]] ==
How to emulate USB stick with KVM.


All debian used are fresh install of wheezy 7.8.<br/>
== [[User_talk:Jch/Starting_AL_from_network|Starting_AL_from_network]] ==
All alpine used are fresh install of edge. (will also try vanilla kernel in KVM)<br/>
How to set up a PXE environement.
All boxes are supermicro servers with bi-Xeon running AL from USB key.<br/>
I do not have physical access to the boxes!


The NFS-servers are configured to export
== [[User_talk:Jch/Building_a_complete_infrastucture_with_AL|Building_a_complete_infrastucture_with_AL]] ==
/srv/home      192.168.1.0/24(rw,sync,no_subtree_check)


The nfs-clients are configured to mount from fstab
<u>From first repo</u> (boot media):
storage:/srv/home /home nfs noauto,defaults,noexec 0 0


"storage" is defined in /etc/hosts to point to the right server.
AlpineLinux dhcpd tftp-hpa syslinux mkinitfs nfs-utils darkhttpd rsync openssh openvswitch screen qemu-system-X86_64 qemu-img gptfdisk parted mdadm lvm2 nbd xfsprogs e2fsprogs multipath '''consul''' dnsmasq vim collectd collectd-network git syslog-ng <s>envconsul</s> <s>consul-template</s> <s>xnbd</s> <s>ceph</s> lxc lxc-templates xfsprogs gptfdisk e2fsprogs multipath wipe tcpdump curl openvpn <s>fsconsul</s>


The test is done with
and all dependecies...
mount /home


We will compare the '''dmesg''' outputs, the '''ls -ld /home''' outputs, the '''cat /home/test''' and '''touch /home/toto''' ones. /home/test is prepared on the server (just a text file containing "do you see me?"). Those tests are run as root user.
will [[How_to_make_a_custom_ISO_image|build a custom ISO]] with that list...


'''Will redo usage tests with non root user because of the default squashroot of NFS...'''
== About NFS ==


== NFS-server in KVM-Debian ==
NFS is now working with AL. Both as server and client with the nfs-utils package.<br/>
 
However, to use NFS as client in some LXC does not seems to work yet as shown below
fresh install with tasksel "file server"<br/>
this KVM in running on bare metal alpine
 
=== nfs-client in KVM AL ===
 
mount /home gives <br/>
in '''dmesg'''
<pre>
<pre>
[73460.112383] RPC: Registered named UNIX socket transport module.
nfstest:~# mount -t nfs -o ro 192.168.1.149:/srv/boot/alpine /mnt
[73460.112386] RPC: Registered udp transport module.
mount.nfs: Operation not permitted
[73460.112388] RPC: Registered tcp transport module.
mount: permission denied (are you root?)
[73460.112389] RPC: Registered tcp NFSv4.1 backchannel transport module.
nfstest:~# tail /var/log/messages
[73460.165060] svc: failed to register lockdv1 RPC service (errno 111).
Apr  4 10:05:59 nfstest daemon.notice rpc.statd[431]: Version 1.3.1 starting
[73460.165069] lockd_up: makesock failed, error=-111
Apr  4 10:05:59 nfstest daemon.warn rpc.statd[431]: Flags: TI-RPC  
[73460.217513] NFS: Registering the id_resolver key type
Apr  4 10:05:59 nfstest daemon.warn rpc.statd[431]: Failed to read /var/lib/nfs/state: Address in use
[73460.217524] Key type id_resolver registered
Apr  4 10:05:59 nfstest daemon.notice rpc.statd[431]: Initializing NSM state
[73460.217525] Key type id_legacy registered
Apr  4 10:05:59 nfstest daemon.warn rpc.statd[431]: Failed to write NSM state number: Operation not permitted
Apr  4 10:05:59 nfstest daemon.warn rpc.statd[431]: Running as root. chown /var/lib/nfs to choose different user
nfstest:~# ls -l /var/lib/nfs
total 12
-rw-r--r--   1 root    root            0 Nov 10 15:43 etab
-rw-r--r--    1 root    root            0 Nov 10 15:43 rmtab
drwx------    2 nobody  root          4096 Apr  4 10:05 sm
drwx------    2 nobody  root          4096 Apr  4 10:05 sm.bak
-rw-r--r--    1 root    root            4 Apr  4 10:05 state
-rw-r--r--    1 root    root            0 Nov 10 15:43 xtab
</pre>
</pre>
in '''ls -ld /home/
drwxr-xr-x    2 42949672 42949672        6 Jan 23 12:27 /home
in '''cat /home/test'''
  Do you see me?
in '''touch /home/toto'''
touch: /home/toto: Permission denied
But with some user with the right real uid:gid,
<pre>
webhosting:~$ ls -ln /homebis/
total 0
drwxr-xr-x    2 4294967294 4294967294        17 Feb  4 09:55 tests
webhosting:~$ ls -ln /homebis//tests/
total 0
-rw-r--r--    1 4294967294 4294967294        0 Feb  4 09:55 toto
webhosting:~$ vi /homebis//tests/toto
webhosting:~$ ls -ln /homebis//tests/
total 4
-rw-r--r--    1 4294967294 4294967294        5 Feb  4 10:06 toto
</pre> The uid:gid does not appear right but access rights seem good.


=== nfs-client in KVM debian ===
msg from ncopa """
dmesg should tell you that grsecurity tries to prevent you to do this.


'''dmesg''' is empty<br/>
grsecurity does not permit the syscall mount from within a chroot since
'''ls -ld /home'''
that is a way to break out of a chroot. This affects lxc containers too.
drwxr-xr-x 2 root root 17 Jan 23 08:39 /home
'''cat /home/test'''
Do you see me?
'''touch /home/toto''' (even after adding rw to the mount options in fstab)
touch: cannot touch `/home/toto': Permission denied


<u>Some pointers to investigate this permission problem</u>:
I would recommend that you do the mouting from the lxc host in the
* http://unix.stackexchange.com/questions/79172/nfs-permission-denied
container config with lxc.mount.entry or similar.


''To begin using machine as an NFS client, you will need the portmapper running on that machine, and to use NFS file locking, you will also need rpc.statd and rpc.lockd running on both the client and the server.''
https://linuxcontainers.org/lxc/manpages/man5/lxc.container.conf.5.html#lbAR


''''
If you still want disable mount protection in grsecurity then you
can do that with:
echo 0 > /proc/sys/kernel/grsecurity/chroot_deny_mount
"""


=== nfs-client in LXC AL (on bare metal AL) ===
this is not working with


apk add nfs-utils
<pre>lxc.mount.entry=nfsserver:/srv/boot/alpine mnt nfs nosuid,intr 0 0</pre>
dmesg empy sofar
mount /home
'''dmesg'''
<pre>
[4153944.457610] RPC: Registered named UNIX socket transport module.
[4153944.457615] RPC: Registered udp transport module.
[4153944.457618] RPC: Registered tcp transport module.
[4153944.457620] RPC: Registered tcp NFSv4.1 backchannel transport module.
[4153944.504475] svc: failed to register lockdv1 RPC service (errno 111).
[4153944.504484] lockd_up: makesock failed, error=-111
[4153944.681725] NFS: Registering the id_resolver key type
[4153944.681744] Key type id_resolver registered
[4153944.681748] Key type id_legacy registered
</pre>
'''ls -ld /home'''
drwxr-xr-x    2 42949672 42949672        17 Jan 23 14:39 /home
'''cat /home/test'''
Do you see me?
'''touch /home/toto'''
touch: /home/toto: Permission denied


=== nfs-client in LXC AL (in KVM AL) ===
on the host machine with all nfs modules and helper software installed and loaded.


apk add nfs-utils
but
<pre>
<pre>
# mount /home
backend:~# lxc-start -n nfstest
mount.nfs: rpc.statd is not running but is required for remote locking.
lxc-start: conf.c: mount_entry: 2049 Invalid argument - failed to mount
mount.nfs: Either use '-o nolock' to keep locks local, or start statd.
'nfsserver:/srv/boot/alpine' on '/usr/lib/lxc/rootfs/mnt'
mount.nfs: an incorrect mount option was specified
lxc-start: conf.c: lxc_setup: 4163 failed to setup the mount entries for
mount: permission denied (are you root?)
'nfstest'
</pre>
lxc-start: start.c: do_start: 688 failed to setup the container
and
lxc-start: sync.c: __sync_wait: 51 invalid sequence number 1. expected 2
<pre>
lxc-start: start.c: __lxc_start: 1080 failed to spawn 'nfstest'
# /etc/init.d/rpc.statd start
* Caching service dependencies ... [ ok ]
* Starting rpcbind ... [ ok ]
* Starting NFS statd ... * start-stop-daemon: failed to start `/usr/sbin/rpc.statd'
[ !! ]
* ERROR: rpc.statd failed to start
</pre>
'''dmesg'''  
<pre>
[74747.135827] rpcbind[6718]: segfault at 7ccfe7b0 ip 000072977ccef5cd sp 00007c6b3e329a68 error 4 in ld-musl-x86_64.so.1[72977cca0000+85000]
[74747.135841] grsec: Segmentation fault occurred at 000000007ccfe7b0 in /sbin/rpcbind[rpcbind:6718] uid/euid:100/100 gid/egid:101/101, parent /bin/busybox[init:1831] uid/euid:0/0 gid/egid:0/0
[74747.135887] grsec: bruteforce prevention initiated due to crash of /sbin/rpcbind against uid 100, banning suid/sgid execs for 15 minutes. Please investigate the crash report for /sbin/rpcbind[rpcbind:6718] uid/euid:100/100 gid/egid:101/101, parent /bin/busybox[init:1831] uid/euid:0/0 gid/egid:0/0
</pre>
</pre>


=== nfs-client in LXC debian (in KVM AL) ===
Nor with


apt-get install nfs-commonn
gives
[FAIL] Starting NFS common utilities: statd idmapd failed!
then mount /home gives same results in guest as in host
== NFS-server in KVM-Alpine ==
Done from a KVM running in memory straight from the iso
CDROM="/my/path/alpine-mini-3.1.1-x86_64.iso"
qemu-system-x86_64 -name test -enable-kvm -cpu qemu64 -m 256 -smp 1 -curses \
  -net nic,vlan=0,model=virtio,macaddr=52:54:32:a0:a0:a0 \
  -net tap,vlan=0,script=/etc/openvswitch/ovs-ifup-lan,downscript=/etc/openvswitch/ovs-ifdown-lan,ifname=test0 \
  -cdrom ${CDROM}
do not forget to issue "grsec nomedeset" at SYSLINUX prompt or you loose the output (I'm doing it trough ssh term)
<pre>
# setup-alpine # no disk install at all, no apk cache but proxy
# . /etc/profile.d/proxy.sh
# apk add nfs-utils
# echo "/home  192.168.1.0/24(rw,no_root_squash)" >> /etc/exports
# echo "Do you see me?" > /home/test
# /etc/init.d/nfs start
* Caching service dependencies ...                                      [ ok ]
* Starting rpcbind ...                                                  [ ok ]
* Starting NFS statd ...
* start-stop-daemon: failed to start `/usr/sbin/rpc.statd'              [ !! ]
* ERROR: rpc.statd failed to start
* ERROR: cannot start nfs as rpc.statd would not start
# dmesg # only relevant lines displayed
[  462.262020] rpcbind[1890]: segfault at 1e783940 ip 000070591e773f1d sp 00007dc1da01a4d8 error 4 in ld-musl-x86_64.so.1[70591e724000+86000]
[  462.262032] grsec: Segmentation fault occurred at 000000001e783940 in /sbin/rpcbind[rpcbind:1890] uid/euid:100/100 gid/egid:101/101, parent /bin/busybox[init:1] uid/euid:0/0 gid/egid:0/0             
[  462.262043] grsec: bruteforce prevention initiated due to crash of /sbin/rpcbind against uid 100, banning suid/sgid execs for 15 minutes.  Please investigate the crash report for /sbin/rpcbind[rpcbind:1890] uid/euid:100/100 gid/egid:101/101, parent /bin/busybox[init:1] uid/euid:0/0 gid/egid:0/0
# poweroff
</pre>
Let's try with the vanilla kernel
CDROM="/my/path/alpine-vanilla-3.1.1-x86_64.iso"
with same command line and same sequence of instructions
<pre>
<pre>
test:~# /etc/init.d/nfs start
echo 0 > /proc/sys/kernel/grsecurity/chroot_deny_mount
* Caching service dependencies ...                                      [ ok ]
* Starting rpcbind ...                                                  [ ok ]
* Starting NFS statd ...
* start-stop-daemon: failed to start `/usr/sbin/rpc.statd'              [ !! ]
* ERROR: rpc.statd failed to start
* ERROR: cannot start nfs as rpc.statd would not start
test:~# dmesg
[  243.445710] rpcbind[1930]: segfault at 33f30940 ip 00007f5a33f20f1d sp 00007fffa4290e48 error 4 in ld-musl-x86_64.so.1[7f5a33ed1000+86000]
test:~# poweroff
</pre>
</pre>


Obviously I will not be able to test clients now...
on the host machine with all nfs modules and helper software installed and loaded which does'nt work either.


'''UPDATE 2015-02-20''' with http://dev.alpinelinux.org/~clandmeter/rpcbind-0.2.3_rc2-r0.apk
To find a proper way to use NFS shares from AL LXC is an important topic in order to be able to, for instance, load balance web servers sharing contents uploaded by users.
NFS works on AlpineLinux x86_64 stable both as server and client.


=== nfs-client on bare metal AL ===
Next step will be to have HA for the NFS server itself (with only AL machines).


=== nfs-client in KVM AL ===
== About NBD ==


=== nfs-client in KVM debian ===
NBD is now in edge/testing thanks to clandmeter.


=== nfs-client in LXC AL (on bare metal AL) ===
we now use xnbd ^^


=== nfs-client in LXC AL (in KVM AL) ===
Also we are still looking after the right solution to backup NBD as a whole (versus by it's content) while in use. dd|nc is the used way nowadays.


=== nfs-client in LXC debian (in KVM AL) ===
== About consul ==


=How to automate KVM creation=
nothing yet but big hopes ^^<br/>
I'm lurking IRC about it ;)


The goal is not only to have a working install but to have it at the after setup-alpine stage without human intervention...
We plan to use it's dynamic DNS feature, it's hosts listing, services inventory, events, k/v store... <br/>
Tis is the first stages of a work in progress...
and even semi high-availability for our PXE infrastructure the consul leader being the active PXEserver and other consul server are dormant PXEservers.<br/>
All config scripts adapted to pull values out of consul k/v datastore based on profiles found out of consul various lists.<br/>
As the key for dhcpd and PXEboot is the hwaddr, it will become our uuid for LAN and consul too.<br/>
'''We are very exited by consul capacities!'''<br/>
Will be avid tester!


I want to pass a Block Device and a name as parameters. The block device could be an image file, a LV, a NBD, a hdd, a raid array, whatever.<br/>
'''Open questions''':
Everything else should be fully automatic according to some config file (stating the http-proxy, the time server, the log server, ...).


The I will just run the script, watch my dhcp logs to discover the new IP assigned (that's why the name is a parameter), then log in with ssh without password to customize it further but at high level only (will be a robot and not me in fact).
# What memory footprint is needed?
# What about dynamycally adapt quorum size?
# Are checks possible triggers?
#* <pre>consul watch -prefix type -name name /path/to/executable</pre>
#* <pre>consul event [options] -name name [payload]</pre>
# What best practice to store etc configurations?
#* http://code.hootsuite.com/distributed-configuration-management-and-dark-launching-using-consul/
#* http://agiletesting.blogspot.fr/2014/11/service-discovery-with-consul-and.html
#* envconsul
#* consul-template


I guess it would be something like emulate boot from usb key with specific overlay already on key... <br/>
log of experimentation at [[User_talk:Jch/consul]]
then run setup-disk with proper parameters on the command line to avoid the interactive process (like setup-alpine does)... <br/>
Methink this could be done from a couple of scripts put in /etc/local.d/. The last.stop one deleting all of them to be clean at next reboot.<br/>
Let's start easy ;)


== How to prepare a img file to emulate an USB key ==
== About CEPH ==


first a working example done in console (accessed trough ssh).<br/>
CEPH is supposed to sovle the problem of high availability for the data stores, be it block devices (disks) or character devices (files).
Will build a script from it...


First, lets's prepare somme block device (here an image file but could be something else) <pre>
The actual situation is not satisfactory.
apk add qemu-img
qemu-img create -f raw usbkey.img 512M
apk del qemu-img
T="usbkey.img"
</pre>


Next, let's install AL on this $T <pre>
'''We are very exited by CEPH capacities!'''<br/>
apk add multipath-tools syslinux dosfstools
Will be avid tester!
fdisk $T
kpartx -av $T
mkdosfs -F32 /dev/mapper/loop1p1
dd if=/usr/share/syslinux/mbr.bin of=/dev/mapper/loop1
syslinux /dev/mapper/loop1p1
mkdir key
mount -t vfat /dev/mapper/loop1p1 key
wget http://wiki.alpinelinux.org/cgi-bin/dl.cgi/v3.1/releases/x86_64/alpine-mini-3.1.1-x86_64.iso
mkdir cdrom
mount alpine-mini-3.1.1-x86_64.iso cdrom
cd cdrom
cp -a .alpine-release * ../key/
cd ..
umount key
umount cdrom
kpartx -d $T
apk del multipath-tools syslinux dosfstools
rm alpine-mini-3.1.1-x86_64.iso
</pre>


This block device may now be use to boot some KVM for instance like: <pre>
The Alpine kernel has now RBD modules compiled.
screen -d -m -S KVM-builder \
qemu-system-x86_64 -name KVM-usb -enable-kvm -cpu qemu64 -curses \
-device nec-usb-xhci -drive if=none,id=usbstick,file=$T -device usb-storage,drive=usbstick
</pre> This is working fine.


The problem is when adding a HDD to the lot, qemu try to boot from the hdd and does not even try to boot from the usb key. Enabling menu in boot let's one access the emulated bios which allows to select USB device to boot interactively but this break the goal of fully automated boot :( The stanza is for instance <pre>
We will build a CEPH cluster out of 3 Ubuntu LTS and use AL boxes as client if possible (to launch qemu instances directly from RBD). If not, we then will attach RBD and reexport them with xNBD inside a debian KVM.
screen -d -m -S KVM-builder \
qemu-system-x86_64 -name KVM-usb -enable-kvm -cpu qemu64 -curses \
-device nec-usb-xhci -drive if=none,id=usbstick,file=$T -device usb-storage,drive=usbstick \
-drive file=$T2 boot menu=on
</pre>


qemu-doc states that very clearly:<br/>
== About Docker ==
> -boot [order=drives][,once=drives][,menu=on|off][,splash=sp_name][,splash-time=sp_time][,reboot-timeout=rb_timeout][,strict=on|off]<br/>
>  Specify boot order drives as a string of drive letters. Valid drive letters depend on the target achitecture. The x86 PC uses: a, b (floppy 1 and 2), c (first hard disk), d (first CD-ROM), n-p (Etherboot from network adapter 1-4), hard disk boot is the default


=Starting AL from network=
not a lot of information on the [[Docker]] page yet ...


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...
== About E-MailRelay ==


Usually this kind of setup needs
E-MailRelay is a simple SMTP proxy and store-and-forward message transfer agent (MTA). <br/>
* a DHCP server to get an IP address and the location of the TFTP server
See http://emailrelay.sourceforge.net/
* 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


First, let's check what is vailable in AL and what is not... ''to be continued''
It compiles fine on AL.
* dhcpcd-6.6.7-r0
<pre>
* tftp-hpa-5.2-r1
apk update
* nfs-utils-1.3.1-r2 darkhttpd-1.10-r1 (nfs seems broken, see supra)
apk add subversion alpine-sdk
* qemu-nbd (not really good but exists)
svn checkout svn://svn.code.sf.net/p/emailrelay/code/trunk emailrelay-code
 
cd emailrelay-code
== PXE_boot ==
./configure --prefix=/usr
 
make
We are trying to do something as in [[PXE_boot]] but are stuck at the moment at some late stage...
make install
 
apk del subversion alpine-sdk
'''This is still not working :('''
apk add libgcc libstdc++
emailrelay --help
</pre>


=== dhcpd ===
But I still have issues to properly build a package because it wants to install some stuff in <PREFIX>/libexec...<br/>
(And I also need to separate -doc, -test, -extra and optionnaly -gui in subpackages I guess)


with package dhcp from repo. 2 instances configured with '''failover''' announcing _next-server_ end _filename_.
== About X2Go ==
Nothing special.


=== tftp ===
=== x2goserver ===  


tftp-hpa configured to serve some SYSLINUX files.
I did prepare x2goserver and nx-libs packages.  


This is a work in progress to do it with AL...
=== x2goclient ===


The config is in /etc/conf.d/in.tftpd<br/>
Then to issue:
<pre>
<pre>
rc-update add in.tftpd
lrelease-qt4 x2goclient.pro
rc-service in.tftpd start
/bin/bash: lrelease-qt4: command not found
</pre>
Makefile:39: recipe for target 'build_client' failed
</pre> Dunno where to find that...


We serve from /var/tftpboot.
== My laptop setup ==


We add to temporary install the syslinux apk to get pxelinix.0 and other libs needed.
AL 3.3 with +/etc/inittab+ <pre>
We did prepare a "pxerd" initramfs file with virtio_net.ko and dhcp included; made sure loop and squashfs are included.
tty5::respawn:/usr/bin/su - jch mcabber
pxelinux.cfg/default looks like <pre>
tty6::respawn:/usr/bin/su - jch tmux
PROMPT 0
tty7::respawn:/usr/bin/su - jch startx
TIMEOUT 3
</pre> and +~/.xinitrc+ <pre>
default alpine
#!/bin/sh
LABEL alpine
exec chromium-browser --no-sandbox
LINUX alpine/vmlinuz-grsec
INITRD alpine/pxerd
APPEND ip=dhcp modules=loop,squashfs,sd-mod,usb-storage modloop=http://192.168.1.2/grsec.modloop.squashfs nomodeset
</pre>
 
Modules are loaded <pre>
/ # lsmod
Module                  Size  Used by    Not tainted
af_packet              28735  0
sr_mod                13487  0
ata_generic            3554  0
cdrom                  40424  1 sr_mod
ata_piix              25601  0
pata_acpi              3326  0
libata                181955  3 ata_generic,ata_piix,pata_acpi
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  0
loop                  18243  0
</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 nor the right rootfs :( <pre>
- Obtaining IP via DHCP (eth0)...: udhcpc (v1.22.1) started
[    0.702774] NET: Registered protocol family 17
Sending discover...
Sending select for 192.168.1.108...
Lease of 192.168.1.108 obtained, lease time 557428
ok.
cat: can't open '/sys/class/dmi/id/product_uuid': No such file or directory
- Mounting boot media: ok.
[    1.336753] tsc: Refined TSC clocksource calibration: 2399.061 MHz
- Installing packages to root filesystem:  0% []OK: 0 MiB in 0 packages
ok.
/sbin/init not found in new root. Launching emergency recovery shell
Type exit to continue boot.
sh: can't access tty; job control turned off
/ #                                           
</pre>
</pre>


=== References ===
== About gpve ==
 
http://www.syslinux.org/wiki/index.php/PXELINUX
 
=== nfs ===
 
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
 
=== http ===
 
With package [[Darkhttpd]] from repo serving from /var/tftpboot/ to serve files needed to boot (kernel, rootfs, apkovl.tar.gz)
 
=== nbd ===
 
I really would like to have xnbd-server in AL.<br/>
For now, we have a qcow2 debian image  added to the apkovl with lbu add; lbu ci.<br/>
This image is used to launch a first KVM with /dev/mdX as second drive.<br/>
In turn, inside the KVM, vdb is used to define a lvm2 volume.<br/>
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.<br/>
As soon as those '''KVM-NBD''' are up, they may be used to <u>launch others</u> or to provide ''datastores''.
 
We put that image on every USB key we use along with mdadm and OpenVSwitch (and collectd).
 
= Building a complete infrastucture with AL =
 
I'm doing it. It's for real! That's my daily job at present ^^
 
I'm building a full private cloud bootstraped with only an AlpineLinux USB key for each physical machine. But next ones will be able to boot from network; not even USB keys will be needed. As a matter of fact, we used more than only one physical USB key because we didn't started from scratch but had a live migration from Debian to Alpine for most of the services and machines...
 
If there is some feed-back, I may develop config files and so on ;)
 
As I started from scratch and OpenVSwitch was not available in Alpine at that time yet, It took me a while to build everything. But to reproduce it, it would be ''piece of cake''!
 
We use qemu-kvm for KVM. But I guess one may use whatever Virtual Machine technology one likes.
 
'''This is the presentation of a use case. Not a HOW TO. And it's still a work in progess...'''
 
== Network ==
 
=== Firewall ===
 
We put a dedicated physical machine on each link between our LAN and other networks.
It just run iptables and some paquets accounting metrology.
 
=== Router ===
 
Physical machine connected to our LAN and other networks (trough a firewall). A static routing table do the trick.
 
=== Switches ===
 
All physical machines run OpenVSwitch reproducing virtually all physical switches we have plus some virtuals only.
 
=== VPN ===
 
All physical machines run openVPN as client to as many switch defined less the physical interfaces of the machine. There is an openVPN server somewhere running in a KVM connected to needed switches.
 
== Storage ==
 
=== SAN ===
 
On each physical machine, a couple of HDD are mounted in raid1 witch mdadm. This raid array is passed as parameter to a KVM who in turn mount it as physical volume for LVM. The created LV are published as NBD with xnbd-server. For the time being, this KVM is running debian 7.8 as xnbd is not in Alpine (yet?)..
 
The SAN also connects to the CEPH cluster as client and publish reached RBD as NBD with xnbd-server. For the time being, this KVM is running debian 7.8 as no xnbd nor RBD are in Alpine (yet?)..
 
=== NAS ===
 
Running on the same physical machine, another KVM is mounting some NBD (with qemu-nbd) as local drives and publishing some directories as NFS shares.
For the time being, this KVM is running debian 7.8 as there is no good nbd-client in Alpine (yet?)... We now have nfs-server and nfs-client in AL.
 
=== CEPH ===
 
KVM with physical HDD as parameters are used for building OSD and MON needed to operate a CEPH cluster.
One KVM is the "console" to drive it from a single point of presence (usefull but not "needed").For the time being, those KVM are running debian 7.8 as CEPH and RBD are not in Alpine (yet?)..
 
== Low-level services ==
 
No service at all is running in the AL on bare metal. All are running is some KVM connected to needed switches by the means of the OpenVSwitches.
The apkovl on the USB keys contains only the scripts to launch KVM and one image file to launch the first SAN. Other KVM are launched from LV in the SAN.
 
=== dhcp ===
 
Exactly two KVM stored in different SAN, ''primary'' and ''secondary'' in <u>failover mode</u>, are running '''dhcp'''d from repo. <br/>
We just have to configure it properly.
 
We have to test if '''dhcp'''d may run in a LXC instead of a KVM?
 
=== DNS ===
 
Nothing to say here because still running on debian.
 
=== Resolver ===
 
With '''dnscache''' from repo.
 
Those KVM have <u>manually assigned IP address in the LAN</u> and does know a gateway to the Internet.<br/>
They use themselves as resolver... <br/>
They know the direct manually assigned IP address in the LAN of the main DNS server of selected domains (for split dns configuration).
 
=== PXEboot ===
 
Need to try ;) It is '''<u>THE NEXT STEP</u>'''!<br/>
Must prepare needed files in '''tftp''' server.<br/>
Must prepare needed files in '''nfs''' server.<br/>
Must prepare needed files in '''darkhttpd''' server.<br/>
Must start both '''dhcpd''' server (''primary'' and '' secondary'') with prepared config in a row.
 
=== Time server ===
 
The router (who has access to internet) usr '''ntpd''' (or similar) from repo, to act as <u>client to the WAN</u> and <u>server to the LAN</u>.
 
=== syslog ===
 
With '''syslog-ng''' from repo, we receive the logs from all machines be it physical or virtual.<br/>
It's the only place who needs '''logrotate''' from repo.
 
=== HTTP proxy/cache ===
 
The web proxy/cache '''squid''', from repo, uses a NBD as cache.
It has a link to the internet to forward requests and one to the LAN.
 
Because of him, no machine, as they are all connected to the LAN, be it physical or virtual, needs a published default gateway.
And all machines are able to install/upgrade packages or to see the WWW as client.
 
We point all AL boxes to this KVM with '''setup-proxy'''.
 
=== Monitoring ===
 
shinken from sources in some LXC with barely only the python package installed


=== Metrology ===
{{pkg|gvpe}}<br>
http://software.schmorp.de/pkg/gvpe.html


'''Collectd''' (one KVM as server, all other machines, be it physical or virtual, as client) with collectd-network from repo.<br/>
Plan to use it to interconnect about 5 sites.
A couple of lines in CGP config file is enough for now.


=== Backups ===
== About freeswitch ==


with common tools: '''rsync''', '''tar''', '''nc''', '''bzip2''', '''openssh''', '''cron'''
I have a request to run a SIP server for a couple of users.<br/>
I'm doing it in some LXC accessed trough an openVPN from Jolla phones.


== High-level services ==
== New rollout of our infra ==


in LXC AL whenever possible.<br/>
This week, we will upgrade some hardware and also redo all the infrastructure based on the fresh 3.3 serie.
in LXC Debian as second choice<br/>
in KVM otherwise.


''edge'' is currently broken and is unfortunately needed for several services :(
The compute nodes will run (on baremetal) with mdadm, openvswitch, qemu, consul, collectd, screen (maybe tmux) and openssh.
Albeit Alpine is fixed ASAP albeit we will need to switch...


=== x2goserver ===
The storage nodes will run a CEPH cluster (unfortunately not based on AL).


AL edge proposes the package '''x2goserver'''.<br/>
Everything else will run in various KVM on the compute nodes.
I would like to give it a try ;)<br/>
It seems to be running (at least installed) in a AL LXC inside a AL KVM and connected trough OVS ^^


but unfortunately, '''x2goclient''' pops up "kex error : did not find one of algos diffie-hellman-group1-sha1 in list curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1 for kex algos"
First, let's check if the needed package are available in the basic ISOs. If yes we will be able to run from USB keys. If not we will need to have sys install on the HDD...

Latest revision as of 01:56, 28 August 2023

How to automate KVM creation

How to emulate USB stick with KVM.

Starting_AL_from_network

How to set up a PXE environement.

Building_a_complete_infrastucture_with_AL

From first repo (boot media):

AlpineLinux dhcpd tftp-hpa syslinux mkinitfs nfs-utils darkhttpd rsync openssh openvswitch screen qemu-system-X86_64 qemu-img gptfdisk parted mdadm lvm2 nbd xfsprogs e2fsprogs multipath consul dnsmasq vim collectd collectd-network git syslog-ng envconsul consul-template xnbd ceph lxc lxc-templates xfsprogs gptfdisk e2fsprogs multipath wipe tcpdump curl openvpn fsconsul

and all dependecies...

will build a custom ISO with that list...

About NFS

NFS is now working with AL. Both as server and client with the nfs-utils package.
However, to use NFS as client in some LXC does not seems to work yet as shown below 

nfstest:~# mount -t nfs -o ro 192.168.1.149:/srv/boot/alpine /mnt
mount.nfs: Operation not permitted
mount: permission denied (are you root?)
nfstest:~# tail /var/log/messages 
Apr  4 10:05:59 nfstest daemon.notice rpc.statd[431]: Version 1.3.1 starting
Apr  4 10:05:59 nfstest daemon.warn rpc.statd[431]: Flags: TI-RPC 
Apr  4 10:05:59 nfstest daemon.warn rpc.statd[431]: Failed to read /var/lib/nfs/state: Address in use
Apr  4 10:05:59 nfstest daemon.notice rpc.statd[431]: Initializing NSM state
Apr  4 10:05:59 nfstest daemon.warn rpc.statd[431]: Failed to write NSM state number: Operation not permitted
Apr  4 10:05:59 nfstest daemon.warn rpc.statd[431]: Running as root.  chown /var/lib/nfs to choose different user
nfstest:~# ls -l /var/lib/nfs
total 12
-rw-r--r--    1 root     root             0 Nov 10 15:43 etab
-rw-r--r--    1 root     root             0 Nov 10 15:43 rmtab
drwx------    2 nobody   root          4096 Apr  4 10:05 sm
drwx------    2 nobody   root          4096 Apr  4 10:05 sm.bak
-rw-r--r--    1 root     root             4 Apr  4 10:05 state
-rw-r--r--    1 root     root             0 Nov 10 15:43 xtab

msg from ncopa """ dmesg should tell you that grsecurity tries to prevent you to do this.

grsecurity does not permit the syscall mount from within a chroot since that is a way to break out of a chroot. This affects lxc containers too.

I would recommend that you do the mouting from the lxc host in the container config with lxc.mount.entry or similar.

https://linuxcontainers.org/lxc/manpages/man5/lxc.container.conf.5.html#lbAR

If you still want disable mount protection in grsecurity then you can do that with: echo 0 > /proc/sys/kernel/grsecurity/chroot_deny_mount """

this is not working with 

lxc.mount.entry=nfsserver:/srv/boot/alpine mnt nfs nosuid,intr 0 0

on the host machine with all nfs modules and helper software installed and loaded. 

backend:~# lxc-start -n nfstest
lxc-start: conf.c: mount_entry: 2049 Invalid argument - failed to mount
'nfsserver:/srv/boot/alpine' on '/usr/lib/lxc/rootfs/mnt'
lxc-start: conf.c: lxc_setup: 4163 failed to setup the mount entries for
'nfstest'
lxc-start: start.c: do_start: 688 failed to setup the container
lxc-start: sync.c: __sync_wait: 51 invalid sequence number 1. expected 2
lxc-start: start.c: __lxc_start: 1080 failed to spawn 'nfstest'

Nor with 

echo 0 > /proc/sys/kernel/grsecurity/chroot_deny_mount

on the host machine with all nfs modules and helper software installed and loaded which does'nt work either.

To find a proper way to use NFS shares from AL LXC is an important topic in order to be able to, for instance, load balance web servers sharing contents uploaded by users.

Next step will be to have HA for the NFS server itself (with only AL machines).

About NBD

NBD is now in edge/testing thanks to clandmeter.

we now use xnbd ^^

Also we are still looking after the right solution to backup NBD as a whole (versus by it's content) while in use. dd|nc is the used way nowadays.

About consul

nothing yet but big hopes ^^
I'm lurking IRC about it ;)

We plan to use it's dynamic DNS feature, it's hosts listing, services inventory, events, k/v store...
and even semi high-availability for our PXE infrastructure the consul leader being the active PXEserver and other consul server are dormant PXEservers.
All config scripts adapted to pull values out of consul k/v datastore based on profiles found out of consul various lists.
As the key for dhcpd and PXEboot is the hwaddr, it will become our uuid for LAN and consul too.
We are very exited by consul capacities!
Will be avid tester!

Open questions:

  1. What memory footprint is needed?
  2. What about dynamycally adapt quorum size?
  3. Are checks possible triggers? 
    • consul watch -prefix type -name name /path/to/executable
    • consul event [options] -name name [payload]
  4. What best practice to store etc configurations?

log of experimentation at User_talk:Jch/consul

About CEPH

CEPH is supposed to sovle the problem of high availability for the data stores, be it block devices (disks) or character devices (files).

The actual situation is not satisfactory.

We are very exited by CEPH capacities!
Will be avid tester!

The Alpine kernel has now RBD modules compiled.

We will build a CEPH cluster out of 3 Ubuntu LTS and use AL boxes as client if possible (to launch qemu instances directly from RBD). If not, we then will attach RBD and reexport them with xNBD inside a debian KVM.

About Docker

not a lot of information on the Docker page yet ...

About E-MailRelay

E-MailRelay is a simple SMTP proxy and store-and-forward message transfer agent (MTA).
See http://emailrelay.sourceforge.net/

It compiles fine on AL. 

apk update
apk add subversion alpine-sdk
svn checkout svn://svn.code.sf.net/p/emailrelay/code/trunk emailrelay-code
cd emailrelay-code
./configure --prefix=/usr
make
make install
apk del subversion alpine-sdk
apk add libgcc libstdc++
emailrelay --help

But I still have issues to properly build a package because it wants to install some stuff in <PREFIX>/libexec...
(And I also need to separate -doc, -test, -extra and optionnaly -gui in subpackages I guess)

About X2Go

x2goserver

I did prepare x2goserver and nx-libs packages.

x2goclient

lrelease-qt4 x2goclient.pro
/bin/bash: lrelease-qt4: command not found
Makefile:39: recipe for target 'build_client' failed

Dunno where to find that...

My laptop setup

AL 3.3 with +/etc/inittab+ 

tty5::respawn:/usr/bin/su - jch mcabber
tty6::respawn:/usr/bin/su - jch tmux
tty7::respawn:/usr/bin/su - jch startx

and +~/.xinitrc+ 

  1. !/bin/sh


exec chromium-browser --no-sandbox

About gpve

gvpe
http://software.schmorp.de/pkg/gvpe.html

Plan to use it to interconnect about 5 sites.

About freeswitch

I have a request to run a SIP server for a couple of users.
I'm doing it in some LXC accessed trough an openVPN from Jolla phones.

New rollout of our infra

This week, we will upgrade some hardware and also redo all the infrastructure based on the fresh 3.3 serie.

The compute nodes will run (on baremetal) with mdadm, openvswitch, qemu, consul, collectd, screen (maybe tmux) and openssh.

The storage nodes will run a CEPH cluster (unfortunately not based on AL).

Everything else will run in various KVM on the compute nodes.

First, let's check if the needed package are available in the basic ISOs. If yes we will be able to run from USB keys. If not we will need to have sys install on the HDD...

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