Synnefo » snf-ganeti

#!/bin/bash

#

# Copyright (C) 2012 Google Inc.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.

set -e -u -o pipefail

shopt -s extglob

readonly self=$(readlink -f $0)

readonly ensure_dirs=@PKGLIBDIR@/ensure-dirs

readonly action_shortcuts=( start stop restart status )

readonly default_nodecount=5

readonly default_instcount=10

readonly default_netprefix=192.0.2

readonly default_netdev=eth0

readonly cluster_name=cluster

# IP address space:

# Cluster: .1

# Nodes: .10-.99

# Instances: .100-.254

readonly first_node_ipaddr_octet=10

readonly first_inst_ipaddr_octet=100

readonly max_node_count=$((first_inst_ipaddr_octet - first_node_ipaddr_octet))

readonly max_instance_count=$((255 - first_inst_ipaddr_octet))

usage() {

  echo "Usage: $0 [-E] [-N] [-c <number>] [-i <number>] [-p <prefix>]"\

       '[-n <netdev>] <directory>'

  echo

  echo 'Options:'

  echo "  -c  Number of virtual nodes (defaults to $default_nodecount)"

  echo "  -i  Number of instances (defaults to $default_instcount)"

  echo "  -p  IPv4 network prefix (defaults to $default_netprefix)"

  echo '  -n  Network device for virtual IP addresses (defaults to'\

       "$default_netdev)"

  echo '  -E  Do not modify /etc/hosts'

  echo '  -N  Do not configure networking'

}

# Variables for options

nodecount=$default_nodecount

instcount=$default_instcount

netprefix=$default_netprefix

netdev=$default_netdev

etchosts=1

networking=1

# Parse options

while getopts :hENc:p:n:i: opt; do

  case "$opt" in

    h)

      usage

      exit 0

    ;;

    c)

      nodecount="$OPTARG"

      if [[ "$nodecount" != +([0-9]) ]]; then

        echo "Invalid node count number: $nodecount" >&2

        exit 1

      elif (( nodecount > max_node_count )); then

        echo "Node count must be $max_node_count or lower" >&2

        exit 1

      fi

    ;;

    i)

      instcount="$OPTARG"

      if [[ "$instcount" != +([0-9]) ]]; then

        echo "Invalid instance count number: $instcount" >&2

        exit 1

      elif (( instcount > max_instance_count )); then

        echo "Instance count must be $max_instance_count or lower" >&2

        exit 1

      fi

    ;;

    p)

      netprefix="$OPTARG"

      if [[ "$netprefix" != +([0-9]).+([0-9]).+([0-9]) ]]; then

        echo "Invalid network prefix: $netprefix" >&2

        exit 1

      fi

    ;;

    n)

      netdev="$OPTARG"

      if ! ip link show $netdev >/dev/null; then

        echo "Invalid network device: $netdev" >&2

        exit 1

      fi

    ;;

    E)

      etchosts=

      ;;

    N)

      networking=

      ;;

    \?)

      echo "Invalid option: -$OPTARG" >&2

      usage >&2

      exit 1

      ;;

    :)

      echo "Option -$OPTARG requires an argument" >&2

      usage >&2

      exit 1

      ;;

  esac

done

shift $((OPTIND - 1))

if [[ "$#" != 1 ]]; then

  usage

  exit 1

fi

readonly rootdir=$1; shift

if [[ ! -d "$rootdir" ]]; then

  echo "Directory '$rootdir' does not exist!" >&2

  exit 1

fi

if (( $nodecount < 1 )); then

  echo "Must create at least one node, currently requested $nodecount" >&2

  exit 1

fi

node_hostname() {

  local -r number="$1"

  echo "node$((number + 1))"

}

instance_hostname() {

  local -r number="$1"

  echo "instance$((number + 1))"

}

node_ipaddr() {

  local -r number="$1"

  echo "$netprefix.$((first_node_ipaddr_octet + number))"

}

instance_ipaddr() {

  local -r number="$1"

  echo "$netprefix.$((first_inst_ipaddr_octet + number))"

}

setup_node() {

  local -r number="$1"

  local -r nodedir=$rootdir/$(node_hostname $number)

  echo "Setting up node '$(node_hostname $number)' ..." >&2

  if [[ ! -d $nodedir ]]; then

    mkdir $nodedir

  fi

  mkdir -p \

    $nodedir@SYSCONFDIR@/default \

    $nodedir@LOCALSTATEDIR@/lock\

    $nodedir@LOCALSTATEDIR@/{lib,log,run}/ganeti

  GANETI_HOSTNAME=$(node_hostname $number) \

  GANETI_ROOTDIR=$nodedir \

  $ensure_dirs

  local -r daemon_args="-b $(node_ipaddr $number)"

  cat > $nodedir/etc/default/ganeti <<EOF

# Default settings for virtual node $i

NODED_ARGS='--no-mlock $daemon_args'

MASTERD_ARGS=''

RAPI_ARGS='$daemon_args'

CONFD_ARGS='$daemon_args'

export GANETI_ROOTDIR='$nodedir'

export GANETI_HOSTNAME='$(node_hostname $number)'

EOF

  cat > $nodedir/cmd <<EOF

#!/bin/bash

export GANETI_ROOTDIR='$nodedir'

export GANETI_HOSTNAME='$(node_hostname $number)'

bash -c "\$*"

EOF

  chmod +x $nodedir/cmd

}

setup_all_nodes() {

  for ((i=0; i < nodecount; ++i)); do

    setup_node $i

  done

}

setup_etc_hosts() {

  echo 'Configuring /etc/hosts ...' >&2

  (

    set -e -u

    local -r tmpfile=$(mktemp /etc/hosts.vcluster.XXXXX)

    trap "rm -f $tmpfile" EXIT

    {

      egrep -v "^$netprefix.[[:digit:]]+[[:space:]]" /etc/hosts

      echo "$netprefix.1 $cluster_name"

      for ((i=0; i < nodecount; ++i)); do

        echo "$(node_ipaddr $i) $(node_hostname $i)"

      done

      for ((i=0; i < instcount; ++i)); do

        echo "$(instance_ipaddr $i) $(instance_hostname $i)"

      done

    } > $tmpfile && \

    chmod 0644 $tmpfile && \

    mv $tmpfile /etc/hosts && \

    trap - EXIT

  )

}

setup_network_interfaces() {

  echo 'Configuring network ...' >&2

  for ((i=0; i < nodecount; ++i)); do

    local ipaddr="$(node_ipaddr $i)/32"

    ip addr del "$ipaddr" dev "$netdev" || :

    ip addr add "$ipaddr" dev "$netdev"

  done

}

setup_scripts() {

  echo 'Configuring helper scripts ...' >&2

  for action in "${action_shortcuts[@]}"; do

    {

      echo '#!/bin/bash'

      for ((i=0; i < nodecount; ++i)); do

        local name=$(node_hostname $i)

        echo "echo 'Action \"$action\" for virtual node \"$name\" ...'"

        echo "$name/cmd /etc/init.d/ganeti $action"

      done

    } > $rootdir/$action-all

    chmod +x $rootdir/$action-all

  done

}

show_info() {

  cat <<EOF

Virtual cluster setup is complete.

Root directory: $rootdir

Cluster name: $cluster_name

EOF

  echo 'Nodes:' $(for ((i=0; i < nodecount; ++i)); do node_hostname $i; done)

  cat <<EOF

Initialize cluster:

  cd $rootdir && node1/cmd gnt-cluster init --no-etc-hosts \\

    --no-ssh-init --no-lvm-storage --no-drbd-storage $cluster_name

Change cluster settings:

  cd $rootdir && node1/cmd gnt-cluster modify \\

    --enabled-hypervisors=fake --specs-nic-count=min=0 \\

    --specs-disk-size=min=0 --specs-disk-count=min=0

Add node:

  cd $rootdir && node1/cmd gnt-node add --no-ssh-key-check node2

EOF

}

setup_all_nodes

if [[ -n "$etchosts" ]]; then

  setup_etc_hosts

fi

if [[ -n "$networking" ]]; then

  setup_network_interfaces

fi

setup_scripts

show_info

exit 0

# vim: set sw=2 sts=2 et :