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* In the initrd, automatically mount all available ephemeral disks.

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This depends on the EC2 instance type, so we have to probe for them.

svn path=/nixos/trunk/; revision=30234
This commit is contained in:
Eelco Dolstra 2011-11-04 18:49:59 +00:00
parent 6f8e30313f
commit 4abfacb468
1 changed files with 45 additions and 20 deletions
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65
modules/virtualisation/amazon-image.nix
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@ -66,15 +66,8 @@ with pkgs.lib;
[ { mountPoint = "/";
device = "/dev/disk/by-label/nixos";
}
{ mountPoint = "/ephemeral0";
device = "/dev/xvdc";
neededForBoot = true;
}
];
swapDevices =
[ { device = "/dev/xvdb"; } ];
boot.initrd.kernelModules = [ "xen-blkfront" "aufs" ];
boot.kernelModules = [ "xen-netfront" ];
@ -85,23 +78,55 @@ with pkgs.lib;
boot.loader.grub.timeout = 0;
boot.loader.grub.extraPerEntryConfig = "root (hd0)";
# Put /tmp and /var on /ephemeral0, which has a lot more space.
# Unfortunately we can't do this with the `fileSystems' option
# because it has no support for creating the source of a bind
# mount. Also, "move" /nix to /ephemeral0 by layering an AUFS
# on top of it so we have a lot more space for Nix operations.
# Mount all formatted ephemeral disks and activate all swap devices.
# We cannot do this with the ‘fileSystems’ and ‘swapDevices’ options
# because the set of devices is dependent on the instance type
# (e.g. "m1.large" has one ephemeral filesystem and one swap device,
# while "m1.large" has two ephemeral filesystems and no swap
# devices). Also, put /tmp and /var on /disk0, since it has a lot
# more space than the root device. Similarly, "move" /nix to /disk0
# by layering an AUFS on top of it so we have a lot more space for
# Nix operations.
boot.initrd.postMountCommands =
''
mkdir -m 1777 -p $targetRoot/ephemeral0/tmp
mkdir -m 1777 -p $targetRoot/tmp
mount --bind $targetRoot/ephemeral0/tmp $targetRoot/tmp
diskNr=0
diskForAufs=
for device in /dev/xvd*; do
if [ "$device" = /dev/xvda1 ]; then continue; fi
fsType=$(blkid -o value -s TYPE "$device" || true)
if [ "$fsType" = swap ]; then
echo "activating swap device $device..."
swapon "$device" || true
elif [ "$fsType" = ext3 ]; then
mp="/disk$diskNr"
diskNr=$((diskNr + 1))
echo "mounting $device om $mp..."
if mountFS "$device" "$mp" "" ext3; then
if [ -z "$diskForAufs" ]; then diskForAufs="$mp"; fi
fi
else
echo "skipping unknown device type $device"
fi
done
mkdir -m 755 -p $targetRoot/ephemeral0/var
mkdir -m 755 -p $targetRoot/var
mount --bind $targetRoot/ephemeral0/var $targetRoot/var
if [ -n "$diskForAufs" ]; then
mkdir -m 755 -p $targetRoot/$diskForAufs/root
mkdir -m 755 -p $targetRoot/ephemeral0/nix
mount -t aufs -o dirs=$targetRoot/ephemeral0/nix=rw:$targetRoot/nix=rr none $targetRoot/nix
mkdir -m 1777 -p $targetRoot/$diskForAufs/root/tmp $targetRoot/tmp
mount --bind $targetRoot/$diskForAufs/root/tmp $targetRoot/tmp
mkdir -m 755 -p $targetRoot/$diskForAufs/root/var $targetRoot/var
mount --bind $targetRoot/$diskForAufs/root/var $targetRoot/var
mkdir -m 755 -p $targetRoot/$diskForAufs/root/nix
mount -t aufs -o dirs=$targetRoot/$diskForAufs/root/nix=rw:$targetRoot/nix=rr none $targetRoot/nix
fi
'';
boot.initrd.extraUtilsCommands =
''
# We need swapon in the initrd.
cp ${pkgs.utillinux}/sbin/swapon $out/bin
'';
# Allow root logins only using the SSH key that the user specified