Developers Clear Containers 3.0 Install

January 4, 2018 ยท View on GitHub

This guide is not intended for end-users. Instead, this guide provides instructions for any developers eager to try Clear Containers 3.0 and who want to build Clear Containers from the source code and are familiar with the process.

Initial setup

The recommended way to create a development environment is to first install the packaged versions of the Clear Containers components to create a working system:

The installation guide instructions will install all required Clear Containers components, plus Docker*, the hypervisor, and the Clear Containers image and kernel.

Requirements to build individual components

  • go 1.8.3.
  • gcc and associated C language build tooling (e.g. make, autoconf and libtool) are required to build cc-shim.

Clear Containers 3.0 components

Since the installation guide will have installed packaged versions of all required components, it is only necessary to install the source for the component(s) you wish to develop with.

IMPORTANT: Do not combine Clear Containers 2.x and Clear Containers 3.x on the same system. Both projects ship cc-proxy and cc-shim which are not compatible with each other. See the upgrading document for further details.

Setup the environment

  1. Define GOPATH

    $ export GOPATH=$HOME/go

  2. Create GOPATH Directory

    $ mkdir -p $GOPATH

  3. Get the code

    $ go get -d github.com/clearcontainers/runtime
$ go get -d github.com/clearcontainers/proxy
$ git clone https://github.com/clearcontainers/shim $GOPATH/src/github.com/clearcontainers/shim
$ go get -d github.com/clearcontainers/agent
$ go get -d github.com/clearcontainers/tests
$ go get -d github.com/clearcontainers/osbuilder

Build and install components

Proxy

$ cd $GOPATH/src/github.com/clearcontainers/proxy
$ make
$ sudo make install

Note: the previous install step will overwrite any proxy binary installed from the cc-proxy package.

Shim

$ cd $GOPATH/src/github.com/clearcontainers/shim
$ ./autogen.sh
$ make
$ sudo make install

Note: the previous install step will overwrite any shim binary installed from the cc-shim package.

Runtime

$ cd $GOPATH/src/github.com/clearcontainers/runtime
$ make build-cc-system
$ sudo -E PATH=$PATH make install-cc-system

The previous install step will create /usr/local/bin/cc-runtime. This ensures the packaged version of the runtime from the cc-runtime package is not overwritten. However, since the installation guide configured Docker to call the runtime as /usr/bin/cc-runtime, it is necessary to modify the docker configuration to make use of your newly-installed development runtime binary:

$ sudo sed -i 's!cc-runtime=/usr/bin/cc-runtime!cc-runtime=/usr/local/bin/cc-runtime!g' /etc/systemd/system/docker.service.d/clear-containers.conf

For more details on the runtime's build system, run:

$ make help

Agent

$ cd $GOPATH/src/github.com/clearcontainers/agent
$ make

The agent is installed inside the root filesystem image used by the hypervisor, hence to test a new agent version it is necessary to create a custom rootfs image. The following example demonstrates how to do this using the osbuilder tooling.

$ cd $GOPATH/src/github.com/clearcontainers/osbuilder

$ # Create a rootfs image
$ sudo -E make rootfs USE_DOCKER=true

$ # Overwrite the default cc-agent binary with a custom built version
$ sudo cp $GOPATH/src/github.com/clearcontainers/agent/cc-agent ./workdir/rootfs/usr/bin/cc-agent

$ # Generate a container.img file
$ sudo -E make image USE_DOCKER=true

$ # Install the custom image
$ sudo install --owner root --group root --mode 0755 workdir/container.img /usr/share/clear-containers/

$ # Update the runtime configuration
$ # (note that this is only an example using default paths).
$ sudo sed -i.bak -e 's!^\(image = ".*"\)!# \1 \
image = "/usr/share/clear-containers/container.img"!g' \
/usr/share/defaults/clear-containers/configuration.toml

Kernel

The latest kernel for Clear Linux can be found on the releases page. The Clear Linux kernel can be used to rebuild and modify a custom VM container kernel as needed. The following example demonstrates how to do this using the osbuilder tooling.

$ cd $GOPATH/src/github.com/clearcontainers/osbuilder

$ # Fetch latest kernel sources from github.com/clearcontainers/linux
$ make kernel-src

$ # Optionally modify kernel sources or config at $PWD/workdir/linux

$ # build kernel
$ make kernel

$ # Install the custom image
$ sudo install --owner root --group root --mode 0755 workdir/vmlinuz.container /usr/share/clear-containers/custom-vmlinuz
$ sudo install --owner root --group root --mode 0755 workdir/vmlinux.container /usr/share/clear-containers/custom-vmlinux

$ # Update the runtime configuration
$ # (note that this is only an example using default paths).
$ # Note: vmlinuz is used for pc platform type.
$ #       vmlinux is used for pc-lite and q35-lite platform type.
$ sudo sed -i.bak -e 's!^\(kernel = ".*"\)!# \1\nkernel = "/usr/share/clear-containers/custom-vmlinuz"!g' \
/usr/share/defaults/clear-containers/configuration.toml

See Also