OSv is a new open-source operating system for virtual-machines. OSv was designed from the ground up to execute a single application on top of a hypervisor, resulting in superior performance and effortless management when compared to traditional operating systems which were designed for a vast range of physical machines.
OSv has new APIs for new applications, but also runs unmodified Linux applications (most of Linux's ABI is supported) and in particular can run an unmodified JVM, and applications built on top of one.
OSv can only be built on a 64-bit x86 Linux distribution. Please note that this means the "x86_64" or "amd64" version, not the 32-bit "i386" version.
If you wish, you can run the script 'scripts/setup.py' as root to install all dependencies. Otherwise, you may follow the manual instructions below.
First, install prerequisite packages:
Debian stable(wheezy) Debian stable(wheezy) requires to compile gcc, gdb and qemu. And also need to configure bridge manually.
More details are available on wiki page: Building OSv on Debian stable
apt-get install build-essential libboost-all-dev genromfs autoconf libtool openjdk-7-jdk ant qemu-utils maven libmaven-shade-plugin-java python-dpkt tcpdump gdb qemu-system-x86 gawk gnutls-bin openssl python-requests lib32stdc++-4.9-dev p11-kit
pacman -S base-devel git python apache-ant maven qemu gdb boost yaml-cpp
Before start building OSv, you'll need to add your account to kvm group.
usermod -aG kvm <user name>
You may use Oracle JDK if you don't want to pull too many
To ensure functional C++11 support, Gcc 4.8 or above is required, as this was the first version to fully comply with the C++11 standard.
Make sure all git submodules are up-to-date:
git submodule update --init --recursive
Finally, build everything at once:
to build only the OSv kernel, or more usefully,
to build an image of the OSv kernel and the default application.
scripts/build creates the image
build/last/usr.img in qcow2 format.
To convert this image to other formats, use the
tool, which can create an image in the vmdk, vdi, raw, or qcow2-old formats
(qcow2-old is an older qcow2 format, compatible with older versions of QEMU).
By default make will use the static libraries and headers of gcc in external submodule. To change this pass
host via *_env variables:
This will use static libraries and headers in the system instead (make sure they are installed before run
if you only want to use C++ static libraries in the system, just set
By default, this runs OSv under KVM, with 4 VCPUs and 2GB of memory, and runs the default management application containing a shell, a REST API server and a browser base dashboard (at port 8000).
If running under KVM you can terminate by hitting Ctrl+A X.
To start osv with external networking:
sudo ./scripts/run.py -n -v
The -v is for kvm's vhost that provides better performance and its setup requires a tap and thus we use sudo.
By default OSv spawns a dhcpd that auto config the virtual nics. Static config can be done within OSv, configure networking like so:
ifconfig virtio-net0 192.168.122.100 netmask 255.255.255.0 up route add default gw 192.168.122.1
test invoke TCPExternalCommunication
Running Java or C applications that already reside within the image:
# Building and running a simple java application example $ scripts/build image=java-example $ scripts/run.py -e "java.so -cp /java-example Hello" # Running an ifconfig by explicit execution of ifconfig.so (compiled C++ code) $ scripts/build $ sudo scripts/run.py -nv -e "/tools/ifconfig.so"