Ceph RBD With LXC Containers [feedly]

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Ceph RBD With LXC Containers
// Ceph

A simple way to secure your data with containers is to use a distributed storage such as Ceph for LXC root storage.

For exemple :

1	lxc-create -n myvm5 -t debian -B rbd --pool rbd --rbd myvm5 --fstype ext4 --fssize 500

Diff file for lxc-create :

1	# diff -u /usr/bin/lxc-create.orig /usr/bin/lxc-create

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73

--- /usr/bin/lxc-create.orig 2014-11-17 04:16:41.181942000 -0500 +++ /usr/bin/lxc-create 2014-11-17 04:35:27.225942000 -0500 @@ -24,6 +24,7 @@ echo "usage: lxc-create -n <name> [-f configuration] [-t template] [-h] [fsopts] -- [template_options]" echo " fsopts: -B none" echo " fsopts: -B lvm [--lvname lvname] [--vgname vgname] [--fstype fstype] [--fssize fssize]" + echo " fsopts: -B rbd [--pool poolname] [--rbd rbd] [--fstype fstype] [--fssize fssize]" echo " fsopts: -B btrfs" echo " flag is not necessary, if possible btrfs support will be used" # echo " fsopts: -B union [--uniontype overlayfs]" @@ -64,7 +65,7 @@ } shortoptions='hn:f:t:B:' -longoptions='help,name:,config:,template:,backingstore:,fstype:,lvname:,vgname:,fssize:' +longoptions='help,name:,config:,template:,backingstore:,fstype:,lvname:,vgname:,pool:,rbd:,fssize:' localstatedir=/var lxc_path=${localstatedir}/lib/lxc bindir=/usr/bin @@ -119,6 +120,16 @@ vgname=$1 shift ;; + --pool) + shift + pool=$1 + shift + ;; + --rbd) + shift + rbd=$1 + shift + ;; --fstype) shift fstype=$1 @@ -161,7 +172,7 @@ fi case "$backingstore" in - lvm|none|btrfs|_unset) :;; + lvm|rbd|none|btrfs|_unset) :;; *) echo "'$backingstore' is not known ('none', 'lvm', 'btrfs')" usage exit 1 @@ -216,6 +227,13 @@ echo "please delete it (using \"lvremove $rootdev\") and try again" exit 1 fi +elif [ "$backingstore" = "rbd" ]; then + which rbd > /dev/null + if [ $? -ne 0 ]; then + echo "rbd command not found. Please install ceph-common package" + exit 1 + fi + rootdev=/dev/rbd/$pool/$rbd elif [ "$backingstore" = "btrfs" ]; then mkdir "$lxc_path/$lxc_name" if ! out=$(btrfs subvolume create "$rootfs" 2>&1); then @@ -257,6 +275,14 @@ mkfs -t $fstype $rootdev || exit 1 mount -t $fstype $rootdev $rootfs fi + +if [ $backingstore = "rbd" ]; then + [ -d "$rootfs" ] || mkdir $rootfs + rbd create $pool/$rbd --size=$fssize || exit 1 + rbd map $pool/$rbd || exit 1 + mkfs -t $fstype $rootdev || exit 1 + mount -t $fstype $rootdev $rootfs +fi if [ ! -z $lxc_template ]; then

If you want to make persistent after reboot, you must add rbd in /etc/ceph/rbdmap and add line in fstab.

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