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348 lines
9.8 KiB
Markdown
348 lines
9.8 KiB
Markdown
[#]: collector: (lujun9972)
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[#]: translator: (wxy)
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[#]: reviewer: (wxy)
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[#]: publisher: (wxy)
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[#]: url: (https://linux.cn/article-10840-1.html)
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[#]: subject: (Building a DNS-as-a-service with OpenStack Designate)
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[#]: via: (https://opensource.com/article/19/4/getting-started-openstack-designate)
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[#]: author: (Amjad Yaseen https://opensource.com/users/ayaseen)
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用 OpenStack Designate 构建一个 DNS 即服务（DNSaaS）
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======
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> 学习如何安装和配置 Designate，这是一个 OpenStack 的多租户 DNS 即服务（DNSaaS）。
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[Designate][2] 是一个多租户的 DNS 即服务，它包括一个用于域名和记录管理的 REST API 和集成了 [Neutron][3] 的框架，并支持 Bind9。
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DNSaaS 可以提供：
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* 一个管理区域和记录的干净利落的 REST API
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* 自动生成记录（集成 OpenStack）
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* 支持多个授权名字服务器
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* 可以托管多个项目/组织
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![Designate's architecture][4]
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这篇文章解释了如何在 CentOS 和 RHEL 上手动安装和配置 Designate 的最新版本，但是同样的配置也可以用在其它发行版上。
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### 在 OpenStack 上安装 Designate
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在我的 [GitHub 仓库][5]里，我已经放了 Ansible 的 bind 和 Designate 角色的示范设置。
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这个设置假定 bing 服务是安装 OpenStack 控制器节点之外（即使你可以在本地安装 bind）。
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1、在 OpenStack 控制节点上安装 Designate 和 bind 软件包：
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```
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# yum install openstack-designate-* bind bind-utils -y
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```
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2、创建 Designate 数据库和用户：
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```
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MariaDB [(none)]> CREATE DATABASE designate CHARACTER SET utf8 COLLATE utf8_general_ci;
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MariaDB [(none)]> GRANT ALL PRIVILEGES ON designate.* TO \
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'designate'@'localhost' IDENTIFIED BY 'rhlab123';
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MariaDB [(none)]> GRANT ALL PRIVILEGES ON designate.* TO 'designate'@'%' \
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IDENTIFIED BY 'rhlab123';
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```
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注意：bind 包必须安装在控制节点之外才能使<ruby>远程名字服务控制<rt>Remote Name Daemon Control</rt></ruby>（RNDC）功能正常。
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### 配置 bind（DNS 服务器）
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1、生成 RNDC 文件：
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```
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rndc-confgen -a -k designate -c /etc/rndc.key -r /dev/urandom
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cat <<EOF> etcrndc.conf
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include "/etc/rndc.key";
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options {
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default-key "designate";
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default-server {{ DNS_SERVER_IP }};
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default-port 953;
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};
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EOF
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```
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2、将下列配置添加到 `named.conf`：
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```
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include "/etc/rndc.key";
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controls {
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inet {{ DNS_SERVER_IP }} allow { localhost;{{ CONTROLLER_SERVER_IP }}; } keys { "designate"; };
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};
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```
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在 `option` 节中，添加：
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```
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options {
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...
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allow-new-zones yes;
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request-ixfr no;
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listen-on port 53 { any; };
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recursion no;
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allow-query { 127.0.0.1; {{ CONTROLLER_SERVER_IP }}; };
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};
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```
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添加正确的权限：
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```
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chown named:named /etc/rndc.key
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chown named:named /etc/rndc.conf
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chmod 600 /etc/rndc.key
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chown -v root:named /etc/named.conf
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chmod g+w /var/named
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# systemctl restart named
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# setsebool named_write_master_zones 1
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```
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3、把 `rndc.key` 和 `rndc.conf` 推入 OpenStack 控制节点：
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```
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# scp -r /etc/rndc* {{ CONTROLLER_SERVER_IP }}:/etc/
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```
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### 创建 OpenStack Designate 服务和端点
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输入：
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```
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# openstack user create --domain default --password-prompt designate
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# openstack role add --project services --user designate admin
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# openstack service create --name designate --description "DNS" dns
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# openstack endpoint create --region RegionOne dns public http://{{ CONTROLLER_SERVER_IP }}:9001/
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# openstack endpoint create --region RegionOne dns internal http://{{ CONTROLLER_SERVER_IP }}:9001/
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# openstack endpoint create --region RegionOne dns admin http://{{ CONTROLLER_SERVER_IP }}:9001/
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```
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### 配置 Designate 服务
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1、编辑 `/etc/designate/designate.conf`：
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在 `[service:api]` 节配置 `auth_strategy`：
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```
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[service:api]
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listen = 0.0.0.0:9001
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auth_strategy = keystone
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api_base_uri = http://{{ CONTROLLER_SERVER_IP }}:9001/
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enable_api_v2 = True
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enabled_extensions_v2 = quotas, reports
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```
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在 `[keystone_authtoken]` 节配置下列选项：
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```
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[keystone_authtoken]
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auth_type = password
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username = designate
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password = rhlab123
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project_name = service
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project_domain_name = Default
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user_domain_name = Default
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www_authenticate_uri = http://{{ CONTROLLER_SERVER_IP }}:5000/
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auth_url = http://{{ CONTROLLER_SERVER_IP }}:5000/
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```
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在 `[service:worker]` 节，启用 worker 模型：
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```
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enabled = True
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notify = True
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```
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在 `[storage:sqlalchemy]` 节，配置数据库访问：
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```
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[storage:sqlalchemy]
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connection = mysql+pymysql://designate:rhlab123@{{ CONTROLLER_SERVER_IP }}/designate
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```
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填充 Designate 数据库：
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```
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# su -s /bin/sh -c "designate-manage database sync" designate
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```
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2、 创建 Designate 的 `pools.yaml` 文件（包含 target 和 bind 细节）：
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编辑 `/etc/designate/pools.yaml`：
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```
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- name: default
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# The name is immutable. There will be no option to change the name after
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# creation and the only way will to change it will be to delete it
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# (and all zones associated with it) and recreate it.
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description: Default Pool
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attributes: {}
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# List out the NS records for zones hosted within this pool
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# This should be a record that is created outside of designate, that
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# points to the public IP of the controller node.
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ns_records:
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- hostname: {{Controller_FQDN}}. # Thisis mDNS
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priority: 1
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# List out the nameservers for this pool. These are the actual BIND servers.
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# We use these to verify changes have propagated to all nameservers.
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nameservers:
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- host: {{ DNS_SERVER_IP }}
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port: 53
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# List out the targets for this pool. For BIND there will be one
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# entry for each BIND server, as we have to run rndc command on each server
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targets:
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- type: bind9
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description: BIND9 Server 1
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# List out the designate-mdns servers from which BIND servers should
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# request zone transfers (AXFRs) from.
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# This should be the IP of the controller node.
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# If you have multiple controllers you can add multiple masters
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# by running designate-mdns on them, and adding them here.
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masters:
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- host: {{ CONTROLLER_SERVER_IP }}
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port: 5354
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# BIND Configuration options
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options:
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host: {{ DNS_SERVER_IP }}
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port: 53
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rndc_host: {{ DNS_SERVER_IP }}
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rndc_port: 953
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rndc_key_file: /etc/rndc.key
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rndc_config_file: /etc/rndc.conf
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```
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填充 Designate 池：
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```
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su -s /bin/sh -c "designate-manage pool update" designate
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```
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3、启动 Designate 中心和 API 服务：
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```
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systemctl enable --now designate-central designate-api
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```
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4、验证 Designate 服务运行：
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```
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# openstack dns service list
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+--------------+--------+-------+--------------+
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| service_name | status | stats | capabilities |
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+--------------+--------+-------+--------------+
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| central | UP | - | - |
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| api | UP | - | - |
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| mdns | UP | - | - |
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| worker | UP | - | - |
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| producer | UP | - | - |
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+--------------+--------+-------+--------------+
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```
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### 用外部 DNS 配置 OpenStack Neutron
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1、为 Designate 服务配置 iptables：
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```
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# iptables -I INPUT -p tcp -m multiport --dports 9001 -m comment --comment "designate incoming" -j ACCEPT
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# iptables -I INPUT -p tcp -m multiport --dports 5354 -m comment --comment "Designate mdns incoming" -j ACCEPT
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# iptables -I INPUT -p tcp -m multiport --dports 53 -m comment --comment "bind incoming" -j ACCEPT
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# iptables -I INPUT -p udp -m multiport --dports 53 -m comment --comment "bind/powerdns incoming" -j ACCEPT
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# iptables -I INPUT -p tcp -m multiport --dports 953 -m comment --comment "rndc incoming - bind only" -j ACCEPT
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# service iptables save; service iptables restart
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# setsebool named_write_master_zones 1
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```
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2、 编辑 `/etc/neutron/neutron.conf` 的 `[default]` 节：
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```
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external_dns_driver = designate
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```
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3、 在 `/etc/neutron/neutron.conf` 中添加 `[designate]` 节：
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```
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[designate]
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url = http://{{ CONTROLLER_SERVER_IP }}:9001/v2 ## This end point of designate
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auth_type = password
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auth_url = http://{{ CONTROLLER_SERVER_IP }}:5000
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username = designate
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password = rhlab123
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project_name = services
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project_domain_name = Default
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user_domain_name = Default
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allow_reverse_dns_lookup = True
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ipv4_ptr_zone_prefix_size = 24
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ipv6_ptr_zone_prefix_size = 116
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```
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4、编辑 `neutron.conf` 的 `dns_domain`：
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```
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dns_domain = rhlab.dev.
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```
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重启：
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```
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# systemctl restart neutron-*
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```
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5、在 `/etc/neutron/plugins/ml2/ml2_conf.ini` 中的组成层 2（ML2）中添加 `dns`：
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```
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extension_drivers=port_security,qos,dns
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```
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6、在 Designate 中添加区域：
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```
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# openstack zone create –email=admin@rhlab.dev rhlab.dev.
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```
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在 `rhlab.dev` 区域中添加记录：
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```
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# openstack recordset create --record '192.168.1.230' --type A rhlab.dev. Test
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```
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Designate 现在就安装和配置好了。
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--------------------------------------------------------------------------------
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via: https://opensource.com/article/19/4/getting-started-openstack-designate
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作者：[Amjad Yaseen][a]
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选题：[lujun9972][b]
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译者：[wxy](https://github.com/wxy)
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校对：[wxy](https://github.com/wxy)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://opensource.com/users/ayaseen
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[b]: https://github.com/lujun9972
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[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/command_line_prompt.png?itok=wbGiJ_yg (Command line prompt)
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[2]: https://docs.openstack.org/designate/latest/
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[3]: /article/19/3/openstack-neutron
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[4]: https://opensource.com/sites/default/files/uploads/openstack_designate_architecture.png (Designate's architecture)
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[5]: https://github.com/ayaseen/designate
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