Suppose that there are two identical hosts: foo.debian.org and bar.debian.org.
-They are running squeeze and have been integrated into Debian infrastructure.
+They are running stable and have been integrated into Debian infrastructure.
They will serve as nodes in a ganeti cluster named foobar.debian.org.
On each node, install the required packages:
{{{
- apt-get install fai-client ssed extlinux
- apt-get install -t squeeze-backports drbd8-utils ganeti2 ganeti-instance-debootstrap ganeti-htools
+ # maybe: apt-get install drbd-utils
+ # maybe: apt-get install ganeti-instance-debootstrap
+ apt-get install ganeti2 ganeti-htools qemu-kvm
}}}
=== configure kernel modules ===
ainsl /etc/modules 'drbd minor_count=255 usermode_helper=/bin/true'
ainsl /etc/modules 'hmac'
ainsl /etc/modules 'tun'
+ ainsl /etc/modules 'ext3'
+ ainsl /etc/modules 'ext4'
}}}
=== configure networking ===
public network.
If the guest virtual machines need to access the private network, then br1
-should be configure rather than eth1.
+should be configured rather than eth1.
To prevent the link address changing due to startup/shutdown of virtual
machines, explicitly set the value.
-{{{
- # /etc/networking/interfaces for foo.debian.org
+This is the interfaces file for foo.debian.org:
+{{{
auto br0
iface br0 inet static
bridge_ports eth0
netmask 255.255.255.0
}}}
+This is the interfaces file for bar.debian.org:
+
+{{{
+ auto br0
+ iface br0 inet static
+ bridge_ports eth0
+ bridge_maxwait 0
+ bridge_fd 0
+ address A.B.C.3
+ netmask 255.255.255.0
+ gateway A.B.C.254
+ up ip link set addr $(cat /sys/class/net/$IFACE/address) dev $IFACE
+
+ auto eth1
+ iface eth1 inet static
+ address E.F.G.3
+ netmask 255.255.255.0
+}}}
+
=== configure lvm ===
On each node, configure lvm to ignore drbd devices and to prefer
{{{
ssed -i \
- -e 's#^\(\s*filter\s\).*#\1= [ "a|.*|", "r|/dev/drbd[0-9]+|" ]#'
+ -e 's#^\(\s*filter\s\).*#\1= [ "a|.*|", "r|/dev/drbd[0-9]+|" ]#' \
-e 's#^\(\s*preferred_names\s\).*#\1= [ "^/dev/dm-*/", "^/dev/cciss/" ]#' \
/etc/lvm/lvm.conf
service lvm2 restart
vgcreate vg_ganeti /dev/cciss/c0d0p3
}}}
-=== create kvmU symbolic links ===
+=== exchange ssh keys ===
-On each node, create vmlinuz and initrd symlinks as expected by the kvm
-hypervisor:
+on each node:
{{{
- ln -s -T /boot/vmlinuz-2.6.32-5-amd64 /boot/vmlinuz-2.6-kvmU
- ln -s -T /boot/initrd.img-2.6.32-5-amd64 /boot/initrd.img-2.6-kvmU
+ mkdir -m 0700 -p /root/.ssh &&
+ ln -s /etc/ssh/ssh_host_rsa_key /root/.ssh/id_rsa
}}}
-=== exchange ssh keys ===
-
-ipsum loren bacon puppet
-
=== configure iptables (via ferm) ===
-ipsum loren bacon puppet
+the nodes must connect to each other over the public and private networks for a number of reasons; see the ganeti2 module in puppet
=== instantiate the cluster ===
--mac-prefix 00:16:37 \
--no-ssh-init \
--no-etc-hosts \
- --hypervisor-parameters kvm:initrd_path=/boot/initrd.img-2.6-kvmU,kernel_path=/boot/vmlinuz-2.6-kvmU \
+ --hypervisor-parameters kvm:initrd_path=,kernel_path= \
foobar.debian.org
}}}
=== add slave nodes ===
-For each slave node (only bar for this example), on the master node (foo):
+For each slave node (only bar for this example):
+
+on the slave, append the master's /etc/ssh/ssh_host_rsa_key.pub to
+/etc/ssh/userkeys/root. This is only required temporarily - once
+everything works, puppet will put it/keep it there.
+
+on the master node (foo):
{{{
gnt-node add \
bar.debian.org
}}}
+more stuff:
+
+{{{
+ gnt-cluster modify --reserved-lvs='vg0/local-swap.*'
+ maybe: gnt-cluster modify --nic-parameters mode=openvswitch
+}}}
+
Note the following:
* the secondary IP address is set to the value of the slave node's interface on the private network
If everything has been configured correctly, no errors should be reported.
-=== create the 'dsa' variant ===
+=== create the 'noop' variant ===
-ipsum loren bacon deboostrap+dsa
+Ensure that the ganeti-os-noop is installed.
----
* the primary and secondary nodes have been explicitly set
* the operating system type is 'debootstrap+dsa'
-* the network interfarce 0 (eth1 on the system) is set to the instance's interface on the public network
+* the network interfarce 0 (eth0 on the system) is set to the instance's interface on the public network
+* If qux.d.o does not yet exist in DNS/LDAP, you may need --no-ip-check --no-name-check. Be careful that the hostname and IP address are not taken already!
----
=== re-configure networking ===
-Ensure that br1 is configured (rather than eth1).
+On the nodes, ensure that br1 is configured (rather than eth1).
-{{{
- # /etc/networking/interfaces for foo.debian.org
+This is the interfaces file for foo.debian.org:
+{{{
auto br0
iface br0 inet static
bridge_ports eth0
up ip link set addr $(cat /sys/class/net/$IFACE/address) dev $IFACE
}}}
+This is the interfaces file for bar.debian.org:
+
+{{{
+ auto br0
+ iface br0 inet static
+ bridge_ports eth0
+ bridge_maxwait 0
+ bridge_fd 0
+ address A.B.C.3
+ netmask 255.255.255.0
+ gateway A.B.C.254
+ up ip link set addr $(cat /sys/class/net/$IFACE/address) dev $IFACE
+
+ auto br1
+ iface br1 inet static
+ bridge_ports eth1
+ bridge_maxwait 0
+ bridge_fd 0
+ address E.F.G.3
+ netmask 255.255.255.0
+ up ip link set addr $(cat /sys/class/net/$IFACE/address) dev $IFACE
+}}}
+
=== create or update the instance ===
-When creating the instance, indicate both netwokrs:
+When creating the instance, indicate both networks:
{{{
gnt-instance add \
--os-size 4GiB \
--os-type debootstrap+dsa \
--hypervisor-parameters kvm:initrd_path=,kernel_path= \
- --net 0:ip=A.B.C.4,1:ip=E.F.G.4 \
+ --net 0:ip=A.B.C.4 \
+ --net 1:link=br1,ip=E.F.G.4 \
qux.debian.org
}}}
-Please note that the dsa bootscript will only configure eth1 (nic0). If
-specifying a second internface, the guest operating system must be updated
-manually.
+* If qux.d.o does not yet exist in DNS/LDAP, you may need --no-ip-check --no-name-check. Be careful that the hostname and IP address are not taken already!
When updating an existing instance, add the interface:
{{{
gnt-instance shutdown qux.debian.org
gnt-instance modify \
- --net add:ip=E.F.G.4 \
+ --net add:link=br1,ip=E.F.G.4 \
qux.debian.org
gnt-instance startup qux.debian.org
}}}
adding interfaces to an instance, the guest opearting system must be updated
manually.
+
+* If you are importing an instance from libvirt with LVM setup, you can adopt LVs:
+
+{{{
+ gnt-instance add -t plain --os-type debootstrap+dsa-wheezy \
+ --disk 0:adopt=lully-boot \
+ --disk 1:adopt=lully-root \
+ --disk 2:adopt=lully-swap \
+ --disk 3:adopt=lully-log \
+ --hypervisor-parameters kvm:initrd_path=,kernel_path= \
+ --net 0:ip=82.195.75.99 -n clementi.debian.org lully.debian.org
+}}}
+
+And you want to convert it to use DRBD afterwards and start it on the other cluster node, so we can ensure that DRBD is correctly working.
+{{{
+ gnt-instance shutdown lully.debian.org
+ gnt-instance modify -t drbd -n czerny.debian.org lully.debian.org
+ gnt-instance failover lully.debian.org
+ gnt-instance startup lully.debian.org
+}}}
+
+* Some instances NEED ide instead of virtio
+
+{{{
+ gnt-instance modify --hypervisor-parameters disk_type=ide fils.debian.org
+}}}
+
+* To import instances with SAN volumes
+
+{{{
+ gnt-instance add -t blockdev --os-type debootstrap+dsa \
+ --disk 0:adopt=/dev/disk/by-id/scsi-reger-boot \
+ --disk 1:adopt=/dev/disk/by-id/scsi-reger-root \
+ --hypervisor-parameters kvm:initrd_path=,kernel_path= \
+ --net 0:ip=206.12.19.124 -n rossini.debian.org reger.debian.org
+}}}
+
+* How to add new LUNs to Bytemark Cluster
+
+** Add new LUN to MSA and export to all blades
+
+{{{
+ Log into MSA controller
+
+ Choose which vdisk to use, use "show vdisks" to list
+
+Add the volume:
+ # create volume vdisk msa2k-2-500gr10 size 5G donizetti
+
+Find a free LUN:
+
+ # show lun-maps
+ or (if we assume they are all the same)
+ # show host-maps 3001438001287090
+
+Make a note of the next free LUN
+
+Generate map commands for all blades, all ports, run locally:
+
+ $ for bl in 1 2 3 4 5 6 ; do for p in 1 2 3 4; do echo "map volume donizetti lun 27 host bm-bl$bl-p$p" ; done ; done
+
+Paste the output into the MSA shell
+
+Find the WWN by doing show host-maps and looking for the volume name.
+Transform it using the sed run at the top of /etc/multipath.conf:
+
+echo "$WWN" | sed -re 's#(.{6})(.{6})0000(.{2})(.*)#36\1000\2\3\4#'
+}}}
+
+{{{
+
+ then:
+ gnt-cluster command "echo 1 > /sys/bus/pci/devices/0000:0e:00.0/cciss0/rescan"
+
+ then:
+ reload multipath-tools on gnt-master (normaly bm-bl1):
+ service multipath-tools reload
+ add the WWNs to dsa-puppet/modules/multipath/files/multipath-bm.conf and define the alias and commit that file to git.
+
+ then:
+ gnt-cluster command "puppet agent -t"
+
+ This will update the multipath config on all cluster nodes. WITHOUT doing this, you can't migrate VMs between nodes.
+}}}
+
+** Remove LUNs.
+
+Order is important, or else things get very, very confused and the world needs a reboot.
+
+*** Make sure nothing uses the volume anymore.
+
+*** Make sure we do not have any partitions lying around for it:
+{{{
+ gnt-cluster command "ls -l /dev/mapper/backuphost*"
+ # and maybe:
+ gnt-cluster command "kpartx -v -p -part -d /dev/mapper/backuphost"
+}}}
+
+*** flush the device, remove the multipath mapping, flush all backing devices:
+{{{
+ root@bm-bl1:~# cat flush-mp-device
+ #!/bin/sh
+
+ dev="$1"
+
+ if [ -z "$dev" ] || ! [ -e "$dev" ]; then
+ echo 2>&1 "Device $dev does not exist."
+ exit 1
+ fi
+
+ devs=$(multipath -ll "$dev" | grep cciss | sed -e 's/.*cciss!//; s/ .*//;')
+
+ if [ -z "$devs" ]; then
+ echo 2>&1 "No backends found for $dev."
+ exit 1
+ fi
+
+ set -e
+
+ blockdev --flushbufs "$dev"
+ multipath -f "$dev"
+ for d in $devs; do
+ blockdev --flushbufs "/dev/cciss/$d"
+ done
+ echo done.
+}}}
+{{{
+ gnt-cluster command "/root/flush-mp-device /dev/mapper/backuphost"
+}}}
+
+*** Immediately afterwards, paste the output of the following to the MSA console. Best prepare this before, so you do it quickly before anything else rescans stuff, reloads or restarts multipathd, and the devices become used again.
+{{{
+ for bl in 1 2 3 4 5 6 ; do for p in 1 2 3 4; do echo "unmap volume DECOMMISSION-backuph host bm-bl$bl-p$p" ; done ; done
+}}}
+
+*** Lastly, rescan the scsi bus on all hosts. Do not forget that. hpacucli and the monitoring tools might lock up the machine if they try to check the status of a device that now no longer exists but that the system still thinkgs is around.
+{{{
+ gnt-cluster command "echo 1 > /sys/bus/pci/devices/0000:0e:00.0/cciss0/rescan"
+}}}
projects / mirror / dsa-wiki.git / blobdiff