add snippets.sh

1 files changed, 52 insertions, 0 deletions

diff --git a/dev_tools/snippets.sh b/dev_tools/snippets.sh
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index 00000000..f99cc361
--- /dev/null
+++ b/dev_tools/snippets.sh
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+su nobody -s /bin/bash
+yaourt -S multipath-tools
+exit
+
+# close running connection
+./dnbd3-client -d /dev/dnbd0 -c
+
+# 1. connect to dnbd3 server
+cd dnbd3/build
+insmod dnbd3.ko
+./dnbd3-client -h gateway -i archLinux.qcow2 -d /dev/dnbd0
+
+# 2. make available partition in qemu container
+modprobe nbd
+qemu-nbd --connect=/dev/nbd0 /dev/dnbd0 --read-only
+
+# 2. make available partition in qemu container (writable)
+# qemu-nbd --connect=/dev/nbd0 /dev/dnbd0 --snapshot
+# todo where is the cow device?
+# todo why does --partition not work?
+# todo use qemu-img instead?
+
+# 3. mount container partition
+modprobe dm_multipath
+kpartx -av /dev/nbd0 # or use fdisk -l and mount offset
+mount /dev/mapper/nbd0p2 /mnt/
+
+# 5. cleanup
+umount /mnt/
+kpartx -d /dev/nbd0
+qemu-nbd --disconnect /dev/nbd0
+
+
+# mount container partition directly
+# yaourt -S libguestfs
+guestmount -a /dev/dnbd0 -m /dev/sda2 --ro /mnt -v
+
+
+# make read-only partition writable
+mknod -m 660 /dev/ram0 b 1 1
+chown root.disk /dev/ram0
+DEV=/dev/mapper/nbd0p2
+SIZE=`blockdev --getsz $DEV`
+dmsetup create sandbox --table "0 $SIZE snapshot $DEV /dev/ram0 N 1"
+mount /dev/mapper/sandbox /mnt
+umount /mnt
+dmsetup remove sandbox
+
+
+modprobe loop
+dd if=/dev/zero of=persistent_storage.img bs=1k count=1000
+losetup /dev/loop0 persistent_storage.img