Octavia负载均衡服务

Octavia 以服务的形式提供负载均衡。本指南涵盖了为 Amphora 驱动程序配置 Octavia。有关详细信息，请参阅 Octavia 文档。

#1. 启用 Octavia

进入部署机，找到 /etc/kolla/globals.yml，并设置

enable_octavia: "yes"

#2. 自动生成证书

kolla-ansible octavia-certificates

证书和密钥将在 /etc/kolla/config/octavia

#3. 重新部署

kolla-ansible -i ./multinode deploy --tags common,horizon,octavia

#4. 构建Amphora镜像

#4.1 安装依赖

sudo apt -y install debootstrap qemu-utils git kpartx

#4.2 获取 Octavia 源代码

建议用国内git平台镜像一份

# 官网命令（不建议）
# git clone https://opendev.org/openstack/octavia -b stable/zed
# 镜像
git clone https://jihulab.com/james-curtis/octavia.git -b stable/zed

#4.3 安装 diskimage-builder

python3 -m venv /dib-venv
source /dib-venv/bin/activate
pip install diskimage-builder

#4.4 镜像源

下一步需要下载大量文件，需要克隆几个仓库，建议使用 jihulab.com

下面是需要设置的部分环境变量

DIB_REPOLOCATION_amphora_agent（将安装在映像中的 amphora-agent 代码的位置）

默认值：https://opendev.org/openstack/octavia

DIB_REPOLOCATION_octavia_lib（将安装在映像中的 octavia-lib 代码的位置）

默认值：https://opendev.org/openstack/octavia-lib

DIB_PYPI_MIRROR_URL
DIB_REPOLOCATION_upper_constraints（upper-constraints.txt依赖包）

默认值：https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt

DIB_DISTRIBUTION_MIRROR（所选基本操作系统的镜像 URL）

注意，这个镜像url是给Ubuntu用的，必须是http。推荐使用中国科学技术大学镜像（http）

导出环境变量

export DIB_REPOLOCATION_amphora_agent=https://jihulab.com/james-curtis/octavia.git
export DIB_REPOLOCATION_octavia_lib=https://jihulab.com/james-curtis/octavia-lib.git
export DIB_DISTRIBUTION_MIRROR=http://mirrors.ustc.edu.cn/ubuntu
export DIB_REPOLOCATION_upper_constraints=https://jihulab.com/james-curtis/requirements/-/raw/stable/zed/upper-constraints.txt
export DIB_PYPI_MIRROR_URL=https://pypi.tuna.tsinghua.edu.cn/simple
export DIB_NO_PYPI_PIP=1

#4.5 创建 Amphora 镜像

cd octavia/diskimage-create
./diskimage-create.sh

构建成功输出如下

2023-02-07 07:17:59.379 | Converting image using qemu-img convert
2023-02-07 07:18:48.341 | Image file /root/octavia/diskimage-create/amphora-x64-haproxy.qcow2 created...
2023-02-07 07:18:48.486 | Build completed successfully
Successfully built the amphora using the stable/zed amphora-agent.
Amphora image size: /root/octavia/diskimage-create/amphora-x64-haproxy.qcow2 380361216

完成后执行，注意切换python虚拟环境

kolla-ansible post-deploy

#4.5.1 常见问题

有可能会碰到依赖版本冲突，整理日志之后如下

2023-02-07 05:26:03.331 | ERROR: Cannot install octavia because these package versions have conflicting dependencies.
2023-02-07 05:26:03.332 | 
2023-02-07 05:26:03.332 | The conflict is caused by:
2023-02-07 05:26:03.332 |     keystonemiddleware 9.4.0 depends on oslo.cache&gt;=1.26.0
2023-02-07 05:26:03.332 |     The user requested (constraint) oslo-cache===2.10.1
2023-02-07 05:26:03.332 | 
2023-02-07 05:26:03.332 | To fix this you could try to:
2023-02-07 05:26:03.332 | 1. loosen the range of package versions you've specified
2023-02-07 05:26:03.332 | 2. remove package versions to allow pip attempt to solve the dependency conflict
2023-02-07 05:26:03.332 | 
2023-02-07 05:26:03.332 | ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/topics/dependency-resolution/#dealing-with-dependency-conflicts
2023-02-07 05:26:08.775 | Unmount /tmp/dib_build.vAReHkDS/mnt/var/cache/apt/archives

或者

2023-02-07 06:58:49.465 |      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 119.9/119.9 kB 341.3 kB/s eta 0:00:00
2023-02-07 06:58:52.487 | ERROR: Cannot install octavia==11.0.1.dev16 because these package versions have conflicting dependencies.
2023-02-07 06:58:52.488 | 
2023-02-07 06:58:52.488 | The conflict is caused by:
2023-02-07 06:58:52.488 |     octavia 11.0.1.dev16 depends on octavia-lib&gt;=3.1.0
2023-02-07 06:58:52.488 |     The user requested (constraint) octavia-lib===2.5.0
2023-02-07 06:58:52.488 | 
2023-02-07 06:58:52.488 | To fix this you could try to:
2023-02-07 06:58:52.488 | 1. loosen the range of package versions you've specified
2023-02-07 06:58:52.488 | 2. remove package versions to allow pip attempt to solve the dependency conflict
2023-02-07 06:58:52.488 | 
2023-02-07 06:58:52.488 | ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/topics/dependency-resolution/#dealing-with-dependency-conflicts
2023-02-07 06:59:02.344 | Unmount /tmp/dib_build.AUyWgqMg/mnt/var/cache/apt/archives

这个之后需要手动编辑 upper-constraints.txt

先把文件下载过来

wget https://jihulab.com/james-curtis/requirements/-/raw/stable/zed/upper-constraints.txt -O /tmp/upper-constraints.txt

然后编辑 upper-constraints.txt

注释冲突的软件包

# oslo.cache===2.10.1
# octavia-lib===2.5.0

修改环境变量

export DIB_REPOLOCATION_upper_constraints=file:///tmp/upper-constraints.txt

重新构建镜像

#5. 激活octavia授权

. /etc/kolla/octavia-openrc.sh

#6. 在 Glance 中注册镜像

openstack image create amphora-x64-haproxy.qcow2 --container-format bare --disk-format qcow2 --private --tag amphora --file /root/octavia/diskimage-create/amphora-x64-haproxy.qcow2 --property hw_architecture='x86_64' --property hw_rng_model=virtio

#7. 验证结果

#7.1 验证命令行

列出所有负载均衡器

openstack loadbalancer list

如果出现

openstack: 'loadbalancer' is not an openstack command. See 'openstack --help'.

安装 python-octaviaclient

pip install python-octaviaclient