1.在ubuntu18.04上搭建openstack环境
注意：ubuntu18.04最低4G内存，尽量将内存和磁盘调大。
参考：https://blog.csdn.net/hunjiancuo5340/article/details/85005995
2.openstack环境搭建成功后会在/opt/stack目录下，下载好相关的代码，并安装好DIB（disk image builder）工具。
设置环境变量（注意:都是在stack用户下进行）
export HOST_USERNAME=stack
export HOST_SCP_USERNAME=ubuntu
export GUEST_USERNAME=ubuntu
export REDSTACK_SCRIPTS=/opt/stack/trove-integration/scripts
export PATH_TROVE=/opt/stack/trove
export ESCAPED_PATH_TROVE='\/opt\/stack\/trove'
export SSH_DIR=/opt/stack/.ssh
export GUEST_LOGDIR=/var/log/trove/
export ESCAPED_GUEST_LOGDIR='\/var\/log\/trove\/'
export DIB_CLOUD_INIT_DATASOURCES='ConfigDrive'
export CONTROLLER_IP=192.168.100.100 #这个ip是openstack环境的controller_ip
export RELEASE=bionic
export ELEMENTS_PATH=/opt/stack/trove-integration/scripts/files/elements/
export ELEMENTS_PATH+=:/opt/stack/diskimage-builder/diskimage_builder/elements
export ELEMENTS_PATH+=:/opt/stack/tripleo-image-elements/elements
3.执行构建命令
disk-image-create -a amd64 -o /tmp/ubuntu_mysql -x --qemu-img-options compat=1.1
--offline ubuntu vm cloud-init-datasources ubuntu-guest ubuntu-mysql 2>&1 | tee /tmp/1.txt
注意：-o 是镜像输出的路径；--offline是离线安装，离线目录默认是：~/.cache/image_create/；ubuntu vm cloud-init-datasources ubuntu-guest ubuntu-mysql 是element； 2>&1 | tee /tmp/1.txt将日至信息保存到 /tmp/1.txt中
以上命令是离线构建一个ubuntu-mysql 镜像，输出到/tmp/目录下。构建成功后会得到/tmp/ubuntu_mysql.qcow2 镜像
FAQ：
1.构建过程中下载镜像的时候特别慢，卡在那里一直不动，有时候镜像还没下载完成，就卡死了。
解答：应该是网络问题，可以先将镜像下载下来保存到指定的目录，默认是~/.cache/image_create/目录，然后采用离线安装--offline；镜像地址是http://cloud-images.ubuntu.com/
2.构建过程中报找不到unsquashfs命令
解答：apt-get install squashfs-tools
3.Did not get /opt/stack/.cache/dib/lockfiles/bionic-server-cloudimg-amd64.squashfs.lock
解答：rm -rf /opt/stack/.cache/dib/lockfiles/bionic-server-cloudimg-amd64.squashfs.lock
4.执行到这一步sudo unsquashfs -f -d /tmp/dib_build.XzOp28nd/mnt /opt/stack/.cache/image-create/bionic-server-cloudimg-amd64.squashfs 过程中被自动killed
解答：将ubuntu 18.04 的内存调大。
5.sudo -Hiu ubuntu dd if=/opt/stack/trove-integration/scripts/files/requirements/ubuntu-requirements-default.txt of=/tmp/dib_build.iqMRLFf6/hooks/requirements.txt
2019-02-14 10:04:03.032 | sudo:unknown user: ubuntu
2019-02-14 10:04:03.034 | sudo: unable to initialize policy plugin
解答：设置环境变量：export HOST_USERNAME=stack
6.2019-02-14 11:43:52.582 | CONTROLLER_IP needs to be set to the ip address that guests will use to contact the controller
解答：设置环境变量：export CONTROLLER_IP=192.168.100.100 #ip是openstack horizon的登陆ip
7.SSH Authorized Keys file must exist along with pub and private key
解答：stack用户下生成ssh
设置环境变量： export SSH_DIR=/opt/stack/.ssh
然后在touch authorized_keys 里面是空的什么都没有写
8.dib-run-parts Running /tmp/in_target.d/pre-install.d/01-trim-pkgs
2019-02-15 02:13:02.083 | E: Unable to locate package libbind9-90
2019-02-15 02:13:02.083 | E: Unable to locate package libdns100
2019-02-15 02:13:02.083 | E: Unable to locate package libept1.4.12
2019-02-15 02:13:02.083 | E: Couldn't find any package by glob 'libept1.4.12'
2019-02-15 02:13:02.083 | E: Couldn't find any package by regex 'libept1.4.12'
2019-02-15 02:13:02.083 | E: Unable to locate package libevent-2.0-5
2019-02-15 02:13:02.083 | E: Couldn't find any package by glob 'libevent-2.0-5'
2019-02-15 02:13:02.083 | E: Couldn't find any package by regex 'libevent-2.0-5'
2019-02-15 02:13:02.083 | E: Unable to locate package libisc95
2019-02-15 02:13:02.083 | E: Unable to locate package liblwres90
2019-02-15 02:13:02.083 | E: Unable to locate package libparted0debian1
2019-02-15 02:13:02.083 | E: Unable to locate package libxapian22
解答：将这些包从vim ./trove-integration/scripts/files/elements/ubuntu-guest/pre-install.d/01-trim-pkgs文件中删除就好了
9.E:Package 'python-software-properties' has no installation candidate
解答：将python-software-properties从vim ./trove-integration/scripts/files/elements/ubuntu-guest/pre-install.d/04-baseline-tools文件中删除
10.E:The repository 'http://repo.percona.com/apt percona-release_0.1-10.bionic_all.deb Release' does not have a Release file.
解答：设置环境变量：export RELEASE=bionic
11.pip install -q --upgrade -r /tmp/in_target.d/requirements.txt -c /tmp/in_target.d/upper-constraints.txt 到这一步特别慢，有时候还会卡着。
解答：vim ./requirements/upper-constraints.txt 将monotonic===1.5注释掉，就好了
12.dib-run-parts Running /tmp/in_target.d/install.d/20-etc 2019-02-15 06:47:06.928 | dd:
failed to open '/etc/init/trove-guest.conf': No such file or directory
解答：
vim ./trove-integration/scripts/files/elements/ubuntu-guest/install.d/20-etc
if
[ -f "/etc/init/trove-guest.conf" ];then
echo
"文件存在"
else
mkdir -p /etc/init/
cd /etc/init/
touch trove-guest.conf
fi
13.E:Package: "libmysqlclient18" has installtion candidate
E:Package: "mysql-server-5.6" has installtion candidate
解答：vim ./trove-integration/scripts/files/elements/ubuntu-mysql/install.d/30-mysql
apt-get -y install libmysqlclient20 mysql-server-core-5.7 percona-xtrabackup${PXB_VERSION_OVERRIDE}
14.mkdir ：cannot create directory '/home/ubuntu_mysql-d/':Permission denied
解答：vim ./diskimage-builder/diskimage_builder/elements/manifests/cleanup.d/01-copy-manifests-dir
sudo mkdir -p ${DIB_MANIFEST_SAVE_DIR}
sudo cp --no-preserve=ownership -rv ${MANIFEST_IMAGE_PATH}
${DIB_MANIFEST_SAVE_DIR}
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