cli

cap -S user=hjk-adam -S recipe=ec2 -S master=ops1prod.sli.juiceanalytics.com -S host_type=simple -S number=1 create

lvm_ephemeral.pl

#!/usr/bin/perl
#
# Create an LVM based ephemeral storage
#

# To add a new instance partition scheme, add it to the dispatch table below
# and create a "create_foo" subroutine, probably based on create_large or create_xlarge
%dispatch = {
  "m1.small" => \&create_small,
  "m1.large" => \&create_large,
  "m1.xlarge" => \&create_xlarge,
}

unless ($ARGV[0]) {
  die "You must provide one of: " . join(", ", keys(%dispatch));
}

my $already_done = 0;
open(FSTAB, "<", "/etc/fstab") or die "Cannot open /etc/fstab";
while (<FSTAB>) {
  $already_done = 1 if /ephemeral/;
}
close(FSTAB);
if ($already_done) {
  print "Already converted to LVM\n";
  exit 0;
} else {
  run_command("mkdir /tmp/old-mount");
  run_command("cp -r /mnt/* /tmp/old-mount");
  run_command("umount /mnt");
  $dispatch{$ARGV[0]}->();
  run_command("mount /mnt");
  run_command("cp -r /tmp/old-mount/* /mnt");
  exit 0;
}

sub create_small {
  run_command("pvcreate /dev/sda2");
  run_command("vgcreate ephemeral /dev/sda2");
  run_command("lvcreate -l 30000 ephemeral -n mnt");
  run_command("mkfs.ext3 -q /dev/ephemeral/mnt");
  run_command("perl -pi -e 's!/dev/sda2!/dev/ephemeral/mnt!g' /etc/fstab");
}

sub create_large {
  @partitions = ( "/dev/sdb", "/dev/sdc" );
  foreach my $thing (@partitions) {
    run_command("pvcreate $thing");
  }
  run_command("vgcreate ephemeral @partitions");
  run_command("lvcreate -i 2 -L 800G -n mnt ephemeral");
  run_command("mkfs.xfs /dev/ephemeral/mnt");
  run_command("perl -pi -e 's!/dev/sdb.+/mnt.+ext3!/dev/ephemeral/mnt /mnt xfs!g' /etc/fstab");
}

sub create_xlarge {
  @partitions = ( "/dev/sdb", "/dev/sdc", "/dev/sdd", "/dev/sde" );
  foreach my $thing (@partitions) {
    run_command("pvcreate $thing");
  }
  run_command("vgcreate ephemeral @partitions");
  run_command("lvcreate -i 4 -L 1.3T -n mnt ephemeral");
  run_command("mkfs.xfs /dev/ephemeral/mnt");
  run_command("perl -pi -e 's!/dev/sdb.+/mnt.+ext3!/dev/ephemeral/mnt /mnt xfs!g' /etc/fstab");
}

sub run_command {
  my $cmd = shift;
  system($cmd);
  if ($? == -1) {
    die "failed to execute: $!\n";
  } elsif ($? & 127) {
    die sprintf "child died with signal %d, %s coredump\n", ($? & 127),  ($? & 128) ? "with" : "without";
  } else {
    my $exit_value = $? >> 8;
    if ($exit_value != 0) {
      die sprintf "child exited with value %d\n", $? >> 8;
    }
  }
}

simple.rb

# The AMI to run
EC2_DATA = {
  :ami => 'ami-3ce70355',
  :groups => [ 'default' ],
  :keypair => 'gsg-keypair',
  :availability_zone => nil,
  :instance_type => 'm1.small',
  :iclassify_tags => [ 'base' ],
  :iclassify_attribs => {
    "foo" => "bar"
  }
}