From: Luca Filipozzi <lfilipoz@emyr.net>
Date: Thu, 31 May 2012 02:48:41 +0000 (+0000)
Subject: start documenting ganeti install
X-Git-Url: https://git.adam-barratt.org.uk/?p=mirror%2Fdsa-wiki.git;a=commitdiff_plain;h=d5fe68cff6bae89851ff8dd1d91dc1867efdb1ad

start documenting ganeti install
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diff --git a/input/howto/install-ganeti.creole b/input/howto/install-ganeti.creole
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+== How To Install Ganeti Clusters and Instances ==
+
+=== How To Install Ganeti Clusters ===
+
+Suppose that you have two identical hosts running squeeze, foo.debian.org and
+bar.debian.org, that will be used as nodes in a ganeti cluster.
+
+==== install required packages ====
+
+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
+}}}
+
+==== configure kernel modules ====
+
+On each node, ensure that required kernel modules are loaded at boot:
+
+{{{
+    ainsl /etc/modules 'drbd minor_count=255 usermode_helper=/bin/true'
+    ainsl /etc/modules 'hmac'
+    ainsl /etc/modules 'tun'
+}}}
+
+==== configure networking ====
+
+Determine a hostname for the cluster (foobar.debian.org) and assign an A record.
+
+On each node, ensure that all nodes and the cluster itself are listed in
+{{{/etc/hosts}}}.
+
+On each node, create a bridge interface: br0.
+
+==== create storage ====
+
+On each node, configure lvm to ignore drbd devices and to prefer
+{{{/dev/cciss}}} devices names to {{{/dev/block}}} device names
+([[http://code.google.com/p/ganeti/issues/detail?id=93|why?]]):
+
+{{{
+    ssed -i \
+      -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
+}}}
+
+On each node, create a volume group:
+
+{{{
+    vgcreate vg_ganeti /dev/cciss/c0d0p3
+}}}
+
+==== create kvmU symbolic links ====
+
+{{{
+    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
+}}}
+
+==== instantiate the cluster ====
+
+On the master node (foo) only:
+
+{{{
+    gnt-cluster init \
+      --master-netdev br0 \
+      --vg-name vg_ganeti \
+      --secondary-ip 192.168.2.213 \
+      --enabled-hypervisors kvm \
+      --nic-parameters link=br0 \
+      --mac-prefix 00:16:37 \
+      --no-ssh-init \
+      --no-etc-hosts \
+      --hypervisor-parameters kvm:initrd_path=/boot/initrd.img-2.6-kvmU \
+      foobar.debian.org
+}}}
+
+==== add slave nodes ===
+
+For each slave node (bar), on the master node (foo):
+
+{{{
+    gnt-node add \
+      --secondary-ip 192.168.2.217 \
+      --no-ssh-key-check \
+      --no-node-setup \
+      bar.debian.org
+}}}
+
+==== verify cluster ====
+
+On the master node (foo):
+
+{{{
+    gnt-cluster verify
+}}}
+
+=== How To Install Ganeti Instances ===
+
+Suppose that the first guest on will be qux.debian.org.
+
+==== define the instance ====
+
+# add qux.debian.org entry in LDAP to establish A record
+# ask hosting partner to establish PTR record as appropriate
+# add qux.debian.org entry in puppet
+# add qux.debian.org entry in nagios
+
+==== create the instance ====
+
+On the master node (foo):
+
+{{{
+    gnt-instance add \
+      --node foo:bar \
+      --disk-template drbd \
+      --os-size 4GiB \
+      --os-type debootstrap+dsa \
+      --hypervisor-parameters kvm:initrd_path=,kernel_path= \
+      --net 0:ip=1.2.3.4 \
+      qux.debian.org
+}}}
+