µOSv

<strong>µOSv is merged into OSv. Please check <a href="https://github.com/cloudius-systems/osv">upstream</a>.<br /> This repository is not maintained anymore.</strong>

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µOSv is lightweight edition of OSv, which uses mruby interpreter instead of Java VM for its system language.
Here's a movie how µOSv looks like: http://www.youtube.com/watch?v=hSK_VZkwmxI

What's this?

It's cloud OS which specialized for running mruby script, works on both KVM and Xen, and some IaaS/VPS services.
Able to run very few memory amount(>90MB for now), very small disk image size(26MB for now), very fast boot-up speed(less than 2sec).
Original OSv is great OS to run Java application, but it's too huge in some usecases. µOSv offers much smaller / simpler enviroment for developers who loves scripting language.

Tested HostOS

KVM on Ubuntu 13.10/x86_64

Try Binary Image

Copy and paste following commands on your shell.

wget https://dl.dropboxusercontent.com/u/648670/uosv_20131219.img
sudo qemu-system-x86_64 -m 128m -drive file=uosv_20131219.img,if=virtio,cache=none \
-netdev user,id=un0,net=192.168.122.0/24,host=192.168.122.1 \
-device virtio-net-pci,netdev=un0 -enable-kvm -cpu host,+x2apic \
-chardev stdio,mux=on,id=stdio -mon chardev=stdio,mode=readline,default \
-device isa-serial,chardev=stdio -nographic

Building

There are prerequisite packages before start building.

Ubuntu

sudo apt-get install openjdk-7-jdk autotools-dev libltdl-dev libtool autoconf autopoint libboost-all-dev \
genromfs zfs-fuse autoconf ant libffi-dev ruby bison gyp git build-essential qemu-utils qemu-system-x86 \
bridge-utils libvirt0 libvirt-bin

wget https://launchpad.net/ubuntu/+archive/primary/+files/libuv-dev_0.10.18-1_amd64.deb
wget https://launchpad.net/ubuntu/+archive/primary/+files/libuv0.10-dbg_0.10.18-1_amd64.deb
wget https://launchpad.net/ubuntu/+archive/primary/+files/libuv0.10_0.10.18-1_amd64.deb
sudo dpkg -i libuv*.deb

To start building, execute following command:

git clone https://github.com/syuu1228/uosv.git
cd uosv
./build.sh

If you want to enable GPL mrbgems, use

./build_gpl.sh

Running µOSv

To run µOSv, execute following command:

./run.sh

You also can specify VM memory size like this:

./run.sh 90m

Updating µOSv filesystem

Add files under userdata/, then execute following command:

./update.sh

License

OSv related products are almost under BSDL.
mruby related products are almost under MIT.
mruby-vedis is under Sleepycat License.

|Product|Dependencies|License | |------ |----------- |------- | |OSv|FreeBSD, ZFS, Prex, Musl|BSDL| |FreeBSD| |BSDL| |ZFS| |CDDL| |Prex| |MIT| |Musl| |MIT, BSDL| |mruby| |MIT| |mruby-dir| |MIT| |mruby-env| |MIT| |mruby-errno| |MIT| |mruby-ipaddr| |MIT| |mruby-mock| |MIT| |mruby-mtest| |MIT| |mruby-pack| |MIT| |mruby-process| |MIT| |mruby-regexp-pcre| |MIT| |mruby-require| |MIT| |mruby-simple-random| |MIT| |mruby-socket| |MIT| |mruby-tempfile| |MIT| |mruby-msgpack| |MIT| |mruby-uv|libuv|MIT| |libuv| |MIT| |mruby-http|mruby-uv|MIT| |mruby-json| |MIT| |mruby-msgpack-rpc|mruby-socket,mruby-msgpack|MIT| |mruby-yaml|libyaml|MIT| |libyaml| |MIT| |mruby-base64| |MIT| |mruby-md5| |MIT| |mruby-vedis| |Sleepycat License| |mruby-sleep| |MIT| |mruby-simplehttp| |MIT| |mruby-httprequest| |MIT| |mruby-aws-s3|mruby-uv, mruby-http, mruby-digest, mruby-pack, mruby-simplehttp, mruby-httprequest|MIT| |mruby-cfunc|libffi|MIT| |libffi|mruby-cfunc|MIT| |μOSv build scripts| |MIT| |mruby-eshell|mruby-io,mruby-dir,mruby-ipaddr|MIT|

These modules are lisenced under copyleft license, disabled by default.

|Product|Dependencies|License | |------ |----------- |------- | |mruby-polarssl|PolarSSL|LGPLv3| |PolarSSL| |GPL/Commercial(Dual)| |mruby-sha1| |GPL|

Limitations

• libuv is ported, but very unstable for now.
• µOSv disables OSv's ZFS, so you only have ramfs for now.
  You can write files on ramfs, but you'll lost all you written data beyond shutdown/reboot.