docs: Create CentOS installation guide

docs/centos-installation-guide.md

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+# Installing Intel® Clear Containers 3.0 on CentOS* version 7
+
+This document _only_ covers installing on a
+[CentOS](https://www.centos.org/) system. It explicitly does **not**
+cover installation on Red Hat* Enterprise Linux (RHEL).
+
+## Required Setup
+
+The installation requires the current user to run the `sudo` command
+without specifying a password. Verify this with the following commands:
+
+```
+$ su -
+# echo "$some_user ALL=(ALL:ALL) NOPASSWD: ALL" | (EDITOR="tee -a" visudo)
+$ exit
+
+```
+
+## Installation steps
+
+1. Ensure the system packages are up-to-date:
+
+```
+$ sudo yum -y update
+
+```
+2. Install Git:
+
+```
+$ sudo yum install -y git
+
+```
+3. Create the installation directory and clone the repository:
+
+```
+$ mkdir -p $HOME/go/src/github/clearcontainers
+$ cd $HOME/go/src/github/clearcontainers
+$ git clone https://github.com/clearcontainers/runtime
+$ cd runtime
+
+```
+4. Run the installation script:
+
+```
+$ script -efc ./installation/centos-setup.sh
+
+```
+
+Note:
+
+- Running the installation script can take a long time as it needs to
+  download source packages and compile them.
+
+- Although it is not strictly necessary to run the installation
+  script using the `script(1)` command, doing so ensures that a log of the
+  installation is written to the file `typescript`. This is useful for
+  administrators to see what changes were made and can also be used to
+  debug any issues.
+
+## Verify the installation was successful
+
+1. Check the `cc-runtime` version:
+
+```
+$ cc-runtime --version
+
+```
+
+2. Test that a Clear Container can be created:
+
+```
+$ sudo docker run -ti busybox sh
+
+```

installation/centos-setup.sh

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+#!/bin/bash
+
+#  This file is part of cc-runtime.
+#
+#  Copyright (C) 2017 Intel Corporation
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software
+#  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+# Description: This script installs Clear Containers on a
+#   CentOS 7 system.
+#
+
+# all errors are fatal
+set -e
+
+# enable tracing
+set -x
+
+SCRIPT_PATH=$(dirname "$(readlink -f "$0")")
+source "${SCRIPT_PATH}/installation-setup.sh"
+source "${SCRIPT_PATH}/../versions.txt"
+
+# List of packages to install to satisfy build dependencies
+pkgs=""
+
+mnl_dev_pkg="libmnl-devel"
+
+# general
+pkgs+=" zlib-devel"
+pkgs+=" gettext-devel"
+pkgs+=" libtool-ltdl-devel"
+pkgs+=" libtool-ltdl"
+pkgs+=" glib2-devel"
+pkgs+=" bzip2"
+pkgs+=" m4"
+
+# for yum-config-manager
+pkgs+=" yum-utils"
+
+# runtime dependencies
+pkgs+=" libuuid-devel"
+pkgs+=" libmnl"
+pkgs+=" ${mnl_dev_pkg}"
+pkgs+=" libffi-devel"
+pkgs+=" pcre-devel"
+
+# qemu lite dependencies
+pkgs+=" libattr-devel"
+pkgs+=" libcap-devel"
+pkgs+=" libcap-ng-devel"
+pkgs+=" pixman-devel"
+
+pkgs+=" gcc-c++"
+
+source /etc/os-release
+
+major_version=$(echo "${VERSION_ID}"|cut -d\. -f1)
+
+if [ "${os_distribution}" = centos ]
+then
+    distro="CentOS"
+else
+    echo >&2 "ERROR: Unrecognised distribution: ${os_distribution}"
+    echo >&2 "ERROR: This script is designed to work on CentOS systems only."
+    exit 1
+fi
+
+site="http://download.opensuse.org"
+dir="repositories/home:/clearcontainers:/clear-containers-3/${distro}_${major_version}"
+repo_file="home:clearcontainers:clear-containers-3.repo"
+cc_repo_url="${site}/${dir}/${repo_file}"
+
+sudo yum -y update
+eval sudo yum -y install "${pkgs}"
+
+sudo yum groupinstall -y 'Development Tools'
+
+pushd "${deps_dir}"
+
+# Install pre-requisites for gcc
+gmp_file="gmp-${gmp_version}.tar.bz2"
+curl -L -O "https://gcc.gnu.org/pub/gcc/infrastructure/${gmp_file}"
+compile gmp "${gmp_file}" "gmp-${gmp_version}"
+
+mpfr_file="mpfr-${mpfr_version}.tar.bz2"
+curl -L -O "https://gcc.gnu.org/pub/gcc/infrastructure/${mpfr_file}"
+compile mpfr "${mpfr_file}" "mpfr-${mpfr_version}"
+
+mpc_file="mpc-${mpc_version}.tar.gz"
+curl -L -O "https://gcc.gnu.org/pub/gcc/infrastructure/${mpc_file}"
+compile mpc "${mpc_file}" "mpc-${mpc_version}"
+
+# Install glib
+glib_setup
+
+# Install json-glib
+json_glib_setup
+
+# Install gcc
+gcc_setup
+
+# Install qemu-lite
+qemu_lite_setup
+
+popd
+
+# Install docker
+sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
+sudo yum -y install docker-ce
+
+# Install Clear Containers components and their dependencies
+sudo yum-config-manager --add-repo "${cc_repo_url}"
+sudo yum -y install cc-runtime cc-proxy cc-shim linux-container clear-containers-image
+
+# Override runtime configuration to use hypervisor from prefix_dir
+# rather than the OBS default values.
+sudo -E prefix_dir="${prefix_dir}" sed -i -e \
+    "s,^path = \"/usr/bin/qemu-system-x86_64\",path = \"${prefix_dir}/bin/qemu-system-x86_64\",g" \
+    /etc/clear-containers/configuration.toml
+
+# Configure CC by default
+service_dir="/etc/systemd/system/docker.service.d"
+sudo mkdir -p "${service_dir}"
+cat <<EOF|sudo tee "${service_dir}/clear-containers.conf"
+[Service]
+ExecStart=
+ExecStart=/usr/bin/dockerd -D --add-runtime cc-runtime=/usr/bin/cc-runtime --default-runtime=cc-runtime
+EOF
+
+sudo systemctl daemon-reload
+sudo systemctl restart docker
+sudo systemctl enable cc-proxy.socket
+sudo systemctl start cc-proxy.socket