.ppt

User Mode Linux Chris Lightfoot Paul Warren Mythic Beasts Ltd.

Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What is it? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

How it works: the old way ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

How it works: the old way ,[object Object],[object Object],[object Object],[object Object],[object Object]

How it works: the new way ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Alternatives (and their disadvantages) ,[object Object],[object Object],[object Object],[object Object],[object Object]

chroot(2) ,[object Object],[object Object],[object Object],[object Object],[object Object]

BSD jails ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Linux VServer ,[object Object],[object Object],[object Object],[object Object]

VMWare ,[object Object],[object Object],[object Object],[object Object],[object Object]

Xen “Virtual Machine Monitor” ,[object Object],[object Object],[object Object],[object Object]

But... ,[object Object],[object Object],[object Object]

Anatomy of a Virtual Server ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

UML Filesystems ,[object Object],[object Object],[object Object],[object Object]

Sparse files ,[object Object],[object Object],[object Object],# ls -lsh root_fs 224M -rw-r--r-- 1 vs1 vs1 8.1G 2004-11-11 22:17 root_fs

Sparse files – HOWTO ,[object Object],dd if=/dev/zero of=foo seek=1024 bs=1M count=1

COW files ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Our solution ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Loopback filesystems ,[object Object],[object Object]

Creating file system images ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Networking options ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],tuntap

Bridging UML2 UML3 UML1 eth0 0.0.0.0 tap0 0.0.0.0 tap1 0.0.0.0 tap2 0.0.0.0 Eth0 212.69.37.40 eth0 212.69.37.41 eth0 212.69.37.42 InterWeb Host br0 212.69.37.27

Bridging ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Bridging ,[object Object],[object Object],[object Object],[object Object]

UML hosting architecture ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],pdw

UML host UML host UML host Billing and mirror server mirrors (nfs) bandwidth (http) backups (rsync, blocksync) Outside world (100Mbps) Internal ( Gbps )

Management scripts ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],pdw

Process tree uml_runner root 1 per host uml_run_host user 1 per guest consolidate user linux user uml_admin user UNIX domain sockets *

Management scripts ,[object Object],[object Object],[object Object],[object Object],[object Object]

Backups ,[object Object],[object Object],[object Object],[object Object]

LVM ,[object Object],[object Object],[object Object],[object Object]

LVM ,[object Object],[object Object],[object Object],[object Object],[object Object]

LVM – 20 second HOWTO ,[object Object],[object Object],[object Object],[object Object]

LVM snapshots ,[object Object],[object Object],[object Object],[object Object]

LVM snapshots HOWTO ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

LVM snapshots vs 2.6 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

blocksync ,[object Object],[object Object],[object Object],[object Object],chris

blocksync ,[object Object],[object Object],[object Object],[object Object]

blocksync ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Use sendfile or mmap+read/write everywhere we can; as usual, the principle is to minimise the number of buffer copies we have to make.

Network monitoring ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],chris

mrtg ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

iftop ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],pdw

netmond ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],chris

Console devices ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],pdw

Console devices ,[object Object],[object Object],0:2345:respawn:/sbin/getty 38400 tty0 ,[object Object],[object Object]

consolidate ,[object Object],[object Object],[object Object],[object Object],pdw

consolidate ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Why bother? ,[object Object],[object Object],chris

Computers are fast and memory is cheap ,[object Object],[object Object]

Computers are fast and memory is cheap ,[object Object],[object Object],[object Object],[object Object]

Computers are fast and memory is cheap ,[object Object]

Consequences ,[object Object],[object Object]

... for users ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

... for us ,[object Object],[object Object],[object Object]

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