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+#!/usr/bin/env bash
+
+# /usr/bin/env bash or /bin/bash ? /usr/bin/env bash is more environment-independent
+# beware of files which were edited in Windows, and have invisible \r end-of-line characters, causing Linux errors
+
+##############################################################################
+# Copyright (c) 2018 Wipro Limited and others.
+#
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Apache License, Version 2.0
+# which accompanies this distribution, and is available at
+# http://www.apache.org/licenses/LICENSE-2.0
+##############################################################################
+
+# OPNFV contribution guidelines Wiki page:
+# https://wiki.opnfv.org/display/DEV/Contribution+Guidelines
+
+# OPNFV/Auto project:
+# https://wiki.opnfv.org/pages/viewpage.action?pageId=12389095
+
+
+# localization control: force script to use default language for output, and force sorting to be bytewise
+# ("C" is from C language, represents "safe" locale everywhere)
+# (result: the script will consider only basic ASCII characters and disable UTF-8 multibyte match)
+export LANG=C
+export LC_ALL=C
+
+##################################################################################
+## installation of OpenStack via OPNFV Apex/TripleO, on CentOS, virtual deployment
+##################################################################################
+# reference manual: https://docs.opnfv.org/en/latest/submodules/apex/docs/release/installation/index.html
+# page for virtual deployment: https://docs.opnfv.org/en/latest/submodules/apex/docs/release/installation/virtual.html
+
+echo "*** begin AUTO install: OPNFV Apex/TripleO"
+
+# check OS version
+echo "*** print OS version (must be CentOS, version 7 or more)"
+cat /etc/*release
+
+# Manage Nested Virtualization
+echo "*** ensure Nested Virtualization is enabled on Intel x86"
+echo "***   nested flag before:"
+cat /sys/module/kvm_intel/parameters/nested
+rm -f /etc/modprobe.d/kvm-nested.conf
+{ printf "options kvm-intel nested=1\n";\
+  printf "options kvm-intel enable_shadow_vmcs=1\n";\
+  printf "options kvm-intel enable_apicv=1\n";\
+  printf "options kvm-intel ept=1\n"; } >> /etc/modprobe.d/kvm-nested.conf
+sudo modprobe -r kvm_intel
+sudo modprobe -a kvm_intel
+echo "***   nested flag after:"
+cat /sys/module/kvm_intel/parameters/nested
+
+echo "*** verify status of modules in the Linux Kernel: kvm_intel module should be loaded for x86_64 machines"
+lsmod | grep kvm_
+grep kvm_ < /proc/modules
+
+# 3 additional pre-installation preparations, lifted from OPNFV/storperf (they are post-installation there):
+# https://wiki.opnfv.org/display/storperf/LaaS+Setup+For+Development#LaaSSetupForDevelopment-InstallOPNFVApex
+# (may of may not be needed, to enable first-time Apex installation on blank server)
+
+# 1) Install Docker
+sudo yum install -y yum-utils device-mapper-persistent-data lvm2
+sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
+sudo yum install -y docker-ce
+sudo systemctl start docker
+
+# 2) Install docker-compose
+sudo curl -L "https://github.com/docker/compose/releases/download/1.21.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
+sudo chmod +x /usr/local/bin/docker-compose
+
+# 3) Install Python
+sudo yum install -y python-virtualenv
+sudo yum groupinstall -y "Development Tools"
+sudo yum install -y openssl-devel
+
+
+# update everything (upgrade: riskier than update, as packages supposed to be unused will be deleted)
+# (note: can take several minutes; may not be necessary)
+sudo yum -y update
+
+
+# download Apex packages
+echo "*** downloading packages:"
+sudo yum -y install https://repos.fedorapeople.org/repos/openstack/openstack-pike/rdo-release-pike-1.noarch.rpm
+sudo yum -y install epel-release
+# note: EPEL = Extra Packages for Enterprise Linux
+sudo curl -o /etc/yum.repos.d/opnfv-apex.repo http://artifacts.opnfv.org/apex/fraser/opnfv-apex.repo
+
+# install three required RPMs (RedHat/RPM Package Managers); this takes several minutes
+sudo yum -y install http://artifacts.opnfv.org/apex/fraser/opnfv-apex-6.2.noarch.rpm http://artifacts.opnfv.org/apex/fraser/opnfv-apex-undercloud-6.2.noarch.rpm http://artifacts.opnfv.org/apex/fraser/opnfv-apex-python34-6.2.noarch.rpm
+
+# clean-up old Apex versions if any
+## precautionary opnfv-clean doesn't work... (even though packages are installed at this point)
+opnfv-clean
+
+# Manage DNS references
+# probably not needed on an already configured server: already has DNS references
+# echo "nameserver 8.8.8.8" >> /etc/resolv.conf
+echo "*** printout of /etc/resolv.conf :"
+cat /etc/resolv.conf
+
+# prepare installation directory
+mkdir -p /opt/opnfv-TripleO-apex
+cd /opt/opnfv-TripleO-apex
+
+# make sure cp is not aliased or a function; same for mv and rm
+unalias cp
+unset -f cp
+unalias mv
+unset -f mv
+unalias rm
+unset -f rm
+
+# 2 YAML files from /etc/opnfv-apex/ are needed for virtual deploys:
+# 1) network_settings.yaml : may need to update NIC names, to match the NIC names on the deployment server
+# 2) standard scenario file (os-nosdn-nofeature-noha.yaml, etc.), or customized deploy_settings.yaml
+
+# make a local copy of YAML files (not necessary: could deploy from /etc/opnfv-apex); local copies are just for clarity
+# 1) network settings
+cp /etc/opnfv-apex/network_settings.yaml .
+# 2) deploy settings
+# copy one of the 40+ pre-defined scenarios (one of the YAML files)
+# for extra customization, git clone Apex repo, and copy and customize the generic deploy_settings.yaml
+# git clone https://git.opnfv.org/apex
+# cp ./apex/config/deploy/deploy_settings.yaml .
+cp /etc/opnfv-apex/os-nosdn-nofeature-noha.yaml ./deploy_settings.yaml
+# cp /etc/opnfv-apex/os-nosdn-nofeature-ha.yaml ./deploy_settings.yaml
+
+# Note: content of os-nosdn-nofeature-noha.yaml
+# ---
+# global_params:
+#   ha_enabled: false
+#
+# deploy_options:
+#   sdn_controller: false
+#   tacker: true
+#  congress: true
+#   sfc: false
+#   vpn: false
+
+
+# modify NIC names in network settings YAML file, specific to your environment (e.g. replace em1 with ens4f0 in LaaS)
+# Note: actually, this should not matter for a virtual environment
+sed -i 's/em1/ens4f0/' network_settings.yaml
+
+# launch deploy (works if openvswitch module is installed, which may not be the case the first time around)
+echo "*** deploying OPNFV by TripleO/Apex:"
+# --debug for detailed debug info
+# -v: Enable virtual deployment
+# note: needs at least 10G RAM for controllers
+sudo opnfv-deploy --debug -v -n network_settings.yaml -d deploy_settings.yaml
+# without --debug:
+# sudo opnfv-deploy -v -n network_settings.yaml -d deploy_settings.yaml
+
+# with specific sizing:
+# sudo opnfv-deploy --debug -v -n network_settings.yaml -d deploy_settings.yaml --virtual-compute-ram 32 --virtual-cpus 16 --virtual-computes 4
+
+
+# verify that the openvswitch module is listed:
+lsmod | grep openvswitch
+grep openvswitch < /proc/modules
+
+##{
+## workaround: do 2 successive installations... not exactly optimal...
+## clean up, as now opnfv-clean should work
+#opnfv-clean
+## second deploy try, should succeed (whether first one failed or succeeded)
+#sudo opnfv-deploy -v -n network_settings.yaml -d deploy_settings.yaml
+##}
+
+
+
+# verifications: https://docs.opnfv.org/en/latest/submodules/apex/docs/release/installation/verification.html
+
+# {
+# if error after deploy.sh: "libvirt.libvirtError: Storage pool not found: no storage pool with matching name 'default'"
+
+# This usually happens if for some reason you are missing a default pool in libvirt:
+# $ virsh pool-list |grep default
+# You can recreate it manually:
+# $ virsh pool-define-as default dir --target /var/lib/libvirt/images/
+# $ virsh pool-autostart default
+# $ virsh pool-start default
+# }
+
+# {
+# if error after deploy.sh: iptc.ip4tc.IPTCError
+# check Apex jira ticket #521 https://jira.opnfv.org/browse/APEX-521
+# }
+
+# OpenvSwitch should not be missing, as it is a requirement from the RPM package:
+# https://github.com/opnfv/apex/blob/stable/fraser/build/rpm_specs/opnfv-apex-common.spec#L15
+
+
+
+# install python 3 on CentOS
+echo "*** begin install python 3.6 (3.4 should be already installed by default)"
+
+sudo yum -y install python36
+# install pip and setup tools
+sudo curl -O https://bootstrap.pypa.io/get-pip.py
+hash -r
+sudo /usr/bin/python3.6 get-pip.py --no-warn-script-location
+
+
+
+echo "*** end AUTO install: OPNFV Apex/TripleO"
+