User talk:Jch: Difference between revisions

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


The goal is not only to have a working install but to have it at the after setup-alpine stage without human intervention...
== [[User_talk:Jch/Starting_AL_from_network|Starting_AL_from_network]] ==
Tis is the first stages of a work in progress...
How to set up a PXE environement.


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/>
== [[User_talk:Jch/Building_a_complete_infrastucture_with_AL|Building_a_complete_infrastucture_with_AL]] ==
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).
<u>From first repo</u> (boot media):


I guess it would be something like emulate boot from usb key with specific overlay already on key... <br/>
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>
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 ===
and all dependecies...


first a working example done in console (accessed trough ssh).<br/>
will [[How_to_make_a_custom_ISO_image|build a custom ISO]] with that list...
Will build a script from it...
 
First, lets's prepare somme block device (here an image file but could be something else) <pre>
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>
apk add multipath-tools syslinux dosfstools
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>
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>
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/>
> -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==
 
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<br/>
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. <br/>
We did prepare a "pxerd" initramfs file with virtio_net.ko, dhcp and nfs included; made sure loop and squashfs are included. <br/>
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 <br/>
'''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...<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).
 
==== dns ====
 
192.168.1.6
 
tinydns from repo with split-dns config.
 
== 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 ====
 
Some KVM is mounting some NBD as local drives and publishing some directories as NFS shares.<br/>
We now have nfs and nbd 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 ====
 
tinydns from repo with split-dns config.
 
==== 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 ====
 
kernel and initrd files in '''tftp''' server.<br/>
copy of usb content in '''nfs''' server.<br/>
apkovl files in '''darkhttpd''' server.
 
==== 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 ====
 
'''Collectd''' (one LXC as server, all other machines, be it physical or virtual, as client) with collectd-network from repo.<br/>
A couple of lines in CGP config file is enough for now.
 
==== Backups ====
 
with common tools: '''rsync''', '''tar''', '''nc''', '''bzip2''', '''openssh''', '''cron'''
 
==== LDAP ====
 
'''openldap''' with openldap-back-hdb, both from repo.
 
http://www.openldap.org/doc/admin24/backends.html states<br/>
> The hdb backend to slapd(8) is the recommended primary backend for a normal slapd database.<br/>
And<br/>
> Note: The hdb backend has superseded the bdb backend, and both will soon be deprecated in favor of the new mdb backend.
 
> The mdb backend to slapd(8) is the upcoming primary backend for a normal slapd database. It uses OpenLDAP's own Lightning Memory-Mapped Database (LMDB) library to store data and is intended to replace the Berkeley DB backends.
 
Unfortunately there is no ''openldap-back-mdb'' package in AL yet.
 
==== Database ====
 
with '''mariaDB''' from repo
 
=== High-level services ===
 
in LXC AL whenever possible.<br/>
in LXC Debian as second choice<br/>
in KVM otherwise.
 
==== x2goserver ====
 
I did package nx-libs and x2goserver. I'm waiting for the packages to be included in edge/testing. They are already being used for single app access. Next step is full desktop but we are not sure if AL is the right choice for full desktop usage for our customers...
 
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"
need to specify diffie-hellman-group1-sha1 in sshd_config. Luckyly a fix exists and my business partner is looking after a way to enhance it's security upstream.
 
==== ejabberd ====
 
with ejabberd from edge/testing repo.
I migrate the mnesia DB from an old debian squeeze just copying the files and changing ownership in a LXC-AL. I just had to disable mod_pubsub to have it run properly. Authentification is done with openLDAP.
I now plan to migrate a very very old jabberd (11 years I guess) running on a debian etch to it if I find a way to keep users's password and rosters...
I also would like to use it as a gateway to IRC to follow #alpine, #alpine-devel and #x2go channels ;)
Some other ejabberd features are interesting to my organisation and we will experiment more in depth, namely mod_sip, mod_stun, mod_proxy65...
 
==== redmine ====
 
in a brand new LXC with edge/main and edge/testing repos<br/>
mostly following [[Redmine]] page<br/>
I use a mariaDB server on another host where I did create the user and pushed the sqldump from a running redmine 3.0.0 instance
 
<pre>
apk update
apk upgrade
reboot
setup-timezone
apk add redmine
apk add ruby-unicorn
cp /etc/unicorn/redmine.conf.rb.sample /etc/unicorn/redmine.conf.rb
vi /etc/conf.d/unicorn
vi /etc/redmine/database.yml
apk add sudo
apk add ruby-mysql2
apk add ruby-yard
apk add tzdata
cd /usr/share/webapps/redmine
sudo -u redmine rake generate_secret_token
sudo -u redmine RAILS_ENV=production rake db:migrate
</pre>
 
==== email ====
 
LDAP - opeldap from repo
 
SMTP in - postfix-ldap from repo
 
Antispam - spamassassin from repo
 
Antivirus - clamav from repo
 
SMTP store - postfix-ldap from repo
 
mail NAS - nfsutils from repo
 
IMAP - dovecot-ldap from repo
 
SMTP relay - emailrelay from source
 
SMTP out - postfix from repo
 
Webmail - squirrelmail from source
 
==== webhosting ====
 
Front-end - nginx
 
Back-end static - darkhttpd
 
Back-end dynamic - php-fpm
 
File server - nfs, sftp (based on ssh-ldap)


== About NFS ==
== About NFS ==
Line 546: Line 89:
NBD is now in edge/testing thanks to clandmeter.
NBD is now in edge/testing thanks to clandmeter.


''I cannot test it properly at the moment because all the machine are busy in prod. and this package allows newstyle only. I'm waiting my new lab machine...''
we now use xnbd ^^
 
We still miss '''xnbd''' fot it's proxy features allowing live migration.
'''We are very exited by xnbd capacities!'''<br/>
Will be avid tester!


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.
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.
== New lab machine ==
Very soon, I will receive a brand new lab machine.
I plan to use lxc in '''qemu''' ('''KVM''') in qemu (yes, '''''twice'''''!) to '''''simulate a rack of servers running AL'''''.
There will be 8 first level KVMs. A '''firewall''', a '''router''', '''storage''' nodes and '''compute''' nodes.
'''OpenVSwitch''' (OVS) will be used to simulate the networks ('''isp''', '''internet''', '''lan''', '''storage''', '''wan''', '''ipmi''').
The first level KVMs will receive block devices (BD) as logical volumes ('''LV''') in '''LVM2''' on top of a '''mdadm''' raid array composed with the physical hard disk drives. <br/>
They will assemble the received BD with mdadm and pass the raw raid as single BD tho the second level SAN KVMs. Those SAN will use LVM2 to publish LV as '''NBD''' on OVS "lan".<br/>
Some second level KVM will mount NBDs to expose '''NFS''' shares.<br/>
Other will mount NBS and NFS for real data access with containers ('''LXC''') and expose services on OVS "wan" or "lan".<br/>
The first second level KVM to be launched will be a virtual laptop from an virtual USB stick. This particuliar machine with offer a PXEboot environment to the OVS "lan".<br/>
The storage and compute nodes will be launched with PXE on the OVS "lan" but will be able to run totally from RAM with no string attached to the boot devices (for instance the initial NFS share).
As soon as 1 SAN and 1 compute node will be available, the PXEboot server will reproduce himself from the virtual laptop USB stick to the compute node using the storage node to store the information about the setup; then live-migrate (keeping status of running machines).
'''eth0''' is ''almays'' connected to OVS "lan" but on the firewall (connected to OVS "internet" and "isp"). <br/>
The router is connected to all OVS but "isp" and "storage".<br/>
The storage nodes are connected to OVS "storage".<br/>
The compute nodes are connected to OVS "wan".
The '''DHCP''' lease is offered with no time limit after absence check on OVS "lan".
As a matter of fact, the only difference between a first and a second level KVM is '''sda''' first and '''vda''' second.
All machines run a '''consul''' instance.<br/> The PXEboot server is a fixed known consul server guarantee to be present (otherwise boot does'nt even exist!).<br/>
On the N first compute nodes launched, a consul server KVM will be started (configured to reach a quorum of N) to replace the standard consul client. <br/>
As the state of a running cluster is always kept in the PXEboot server, This capacity is present in all consul server but active only on the actual consul leader.<br/>
We need to link or maintain the PXE configuration and bootstrap (including relevant apkovl) files to the consul key/value datastore to benefit from his resilience.<br/>
We need to hack lbu commit to push the resulting apkovl to all consul servers (as they are also stand-by copy of the consul leader).<br/>
Each consul election need to enforce the consul leader as the active PXE server.
In the real rack, at this stage, we just switch machine on connected to right switches after checking that it will boot trough PXE on first NIC (eth0).<br/>
In our simulator, we can manually start a KVM as fake physical machine (sda) or have a script on the real physical lab machine driving the lyfe cycle of those KVMs.


== About consul ==
== About consul ==
Line 605: Line 105:
Will be avid tester!
Will be avid tester!


=== Open questions ===
'''Open questions''':


# What memory footprint is needed?
# What memory footprint is needed?
Line 614: Line 114:
# What best practice to store etc configurations?
# What best practice to store etc configurations?
#* http://code.hootsuite.com/distributed-configuration-management-and-dark-launching-using-consul/
#* http://code.hootsuite.com/distributed-configuration-management-and-dark-launching-using-consul/
#* http://www.ansible.com/get-started?__hssc=&__hstc=
#* http://agiletesting.blogspot.fr/2014/11/service-discovery-with-consul-and.html
#* http://agiletesting.blogspot.fr/2014/11/service-discovery-with-consul-and.html
#* envconsul
#* consul-template


=== consul_template ===
log of experimentation at [[User_talk:Jch/consul]]
 
seems a very interesting feature!<br/>
Hope to see it packaged as soon as consul will be ;)


== About CEPH ==
== About CEPH ==
Line 630: Line 128:
'''We are very exited by CEPH capacities!'''<br/>
'''We are very exited by CEPH capacities!'''<br/>
Will be avid tester!
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). <br/>
See http://emailrelay.sourceforge.net/
It compiles fine on AL.
<pre>
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
</pre>
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)
== About X2Go ==
=== x2goserver ===
I did prepare x2goserver and nx-libs packages.
=== x2goclient ===
<pre>
lrelease-qt4 x2goclient.pro
/bin/bash: lrelease-qt4: command not found
Makefile:39: recipe for target 'build_client' failed
</pre> Dunno where to find that...
== My laptop setup ==
AL 3.3 with +/etc/inittab+ <pre>
tty5::respawn:/usr/bin/su - jch mcabber
tty6::respawn:/usr/bin/su - jch tmux
tty7::respawn:/usr/bin/su - jch startx
</pre> and +~/.xinitrc+ <pre>
#!/bin/sh
exec chromium-browser --no-sandbox
</pre>
== About gpve ==
{{pkg|gvpe}}<br>
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.<br/>
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...

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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