这篇文章主要介绍了怎么用OpenStack Designate构建一个DNS即服务，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。
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Designate 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 的框架，并支持 Bind9。
DNSaaS 可以提供：
一个管理区域和记录的干净利落的 REST API
自动生成记录（集成 OpenStack）
支持多个授权名字服务器
可以托管多个项目/组织
Designate's architecture
这篇文章解释了如何在 CentOS 和 RHEL 上手动安装和配置 Designate 的当前版本，但是同样的配置也可以用在其它发行版上。
在 OpenStack 上安装 Designate
在我的 GitHub 仓库里，我已经放了 Ansible 的 bind 和 Designate 角色的示范设置。
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）。
1、在 OpenStack 控制节点上安装 Designate 和 bind 软件包：
# yum install openstack-designate-* bind bind-utils -y
2、创建 Designate 数据库和用户：
MariaDB [(none)]> CREATE DATABASE designate CHARACTER SET utf8 COLLATE utf8_general_ci; MariaDB [(none)]> GRANT ALL PRIVILEGES ON designate.* TO \'designate'@'localhost' IDENTIFIED BY 'rhlab123'; MariaDB [(none)]> GRANT ALL PRIVILEGES ON designate.* TO 'designate'@'%' \IDENTIFIED BY 'rhlab123';
注意：bind 包必须安装在控制节点之外才能使远程名字服务控制（RNDC）功能正常。
配置 bind（DNS 服务器）
1、生成 RNDC 文件：
rndc-confgen -a -k designate -c /etc/rndc.key -r /dev/urandom cat < etcrndc.confinclude "/etc/rndc.key";options { default-key "designate"; default-server {{ DNS_SERVER_IP }}; default-port 953;};EOF
2、将下列配置添加到 named.conf：
include "/etc/rndc.key"; controls { inet {{ DNS_SERVER_IP }} allow { localhost;{{ CONTROLLER_SERVER_IP }}; } keys { "designate"; };};在 option 节中，添加：
options { ... allow-new-zones yes; request-ixfr no; listen-on port 53 { any; }; recursion no; allow-query { 127.0.0.1; {{ CONTROLLER_SERVER_IP }}; };};添加正确的权限：
chown named:named /etc/rndc.keychown named:named /etc/rndc.confchmod 600 /etc/rndc.keychown -v root:named /etc/named.confchmod g+w /var/named # systemctl restart named# setsebool named_write_master_zones 1
3、把 rndc.key 和 rndc.conf 推入 OpenStack 控制节点：
# scp -r /etc/rndc* {{ CONTROLLER_SERVER_IP }}:/etc/创建 OpenStack Designate 服务和端点
输入：
# openstack user create --domain default --password-prompt designate# openstack role add --project services --user designate admin# openstack service create --name designate --description "DNS" dns # openstack endpoint create --region RegionOne dns public http://{{ CONTROLLER_SERVER_IP }}:9001/# openstack endpoint create --region RegionOne dns internal http://{{ CONTROLLER_SERVER_IP }}:9001/ # openstack endpoint create --region RegionOne dns admin http://{{ CONTROLLER_SERVER_IP }}:9001/配置 Designate 服务
1、编辑 /etc/designate/designate.conf：
在 [service:api] 节配置 auth_strategy：
[service:api]listen = 0.0.0.0:9001auth_strategy = keystoneapi_base_uri = http://{{ CONTROLLER_SERVER_IP }}:9001/enable_api_v2 = Trueenabled_extensions_v2 = quotas, reports在 [keystone_authtoken] 节配置下列选项：
[keystone_authtoken]auth_type = passwordusername = designatepassword = rhlab123project_name = serviceproject_domain_name = Defaultuser_domain_name = Defaultwww_authenticate_uri = http://{{ CONTROLLER_SERVER_IP }}:5000/auth_url = http://{{ CONTROLLER_SERVER_IP }}:5000/在 [service:worker] 节，启用 worker 模型：
enabled = Truenotify = True
在 [storage:sqlalchemy] 节，配置数据库访问：
[storage:sqlalchemy]connection = MySQL+pymysql://designate:rhlab123@{{ CONTROLLER_SERVER_IP }}/designate填充 Designate 数据库：
# su -s /bin/sh -c "designate-manage database sync" designate
2、 创建 Designate 的 pools.yaml 文件（包含 target 和 bind 细节）：
编辑 /etc/designate/pools.yaml：
- name: default # The name is immutable. There will be no option to change the name after # creation and the only way will to change it will be to delete it # (and all zones associated with it) and recreate it. description: Default Pool attributes: {} # List out the NS records for zones hosted within this pool # This should be a record that is created outside of designate, that # points to the public IP of the controller node. ns_records: - hostname: {{Controller_FQDN}}. # Thisis mDNS priority: 1 # List out the nameservers for this pool. These are the actual BIND servers. # We use these to verify changes have propagated to all nameservers. nameservers: - host: {{ DNS_SERVER_IP }} port: 53 # List out the targets for this pool. For BIND there will be one # entry for each BIND server, as we have to run rndc command on each server targets: - type: bind9 description: BIND9 Server 1 # List out the designate-mdns servers from which BIND servers should # request zone transfers (AXFRs) from. # This should be the IP of the controller node. # If you have multiple controllers you can add multiple masters # by running designate-mdns on them, and adding them here. masters: - host: {{ CONTROLLER_SERVER_IP }} port: 5354 # BIND Configuration options options: host: {{ DNS_SERVER_IP }} port: 53 rndc_host: {{ DNS_SERVER_IP }} rndc_port: 953 rndc_key_file: /etc/rndc.key rndc_config_file: /etc/rndc.conf填充 Designate 池：
su -s /bin/sh -c "designate-manage pool update" designate
3、启动 Designate 中心和 API 服务：
systemctl enable --now designate-central designate-api
4、验证 Designate 服务运行：
# openstack dns service list +--------------+--------+-------+--------------+| service_name | status | stats | capabilities |+--------------+--------+-------+--------------+| central | UP | - | - || api | UP | - | - || mdns | UP | - | - || worker | UP | - | - || producer | UP | - | - |+--------------+--------+-------+--------------+
用外部 DNS 配置 OpenStack Neutron
1、为 Designate 服务配置 iptables：
# iptables -I INPUT -p tcp -m multiport --dports 9001 -m comment --comment "designate incoming" -j ACCEPT # iptables -I INPUT -p tcp -m multiport --dports 5354 -m comment --comment "Designate mdns incoming" -j ACCEPT # iptables -I INPUT -p tcp -m multiport --dports 53 -m comment --comment "bind incoming" -j ACCEPT # iptables -I INPUT -p udp -m multiport --dports 53 -m comment --comment "bind/powerdns incoming" -j ACCEPT # iptables -I INPUT -p tcp -m multiport --dports 953 -m comment --comment "rndc incoming - bind only" -j ACCEPT # service iptables save; service iptables restart# setsebool named_write_master_zones 1
2、 编辑 /etc/neutron/neutron.conf 的 [default] 节：
external_dns_driver = designate
3、 在 /etc/neutron/neutron.conf 中添加 [designate] 节：
[designate]url = http://{{ CONTROLLER_SERVER_IP }}:9001/v2 ## This end point of designateauth_type = passwordauth_url = http://{{ CONTROLLER_SERVER_IP }}:5000username = designatepassword = rhlab123project_name = servicesproject_domain_name = Defaultuser_domain_name = Defaultallow_reverse_dns_lookup = Trueipv4_ptr_zone_prefix_size = 24ipv6_ptr_zone_prefix_size = 1164、编辑 neutron.conf 的 dns_domain：
dns_domain = rhlab.dev.
重启：
# systemctl restart neutron-*
5、在 /etc/neutron/plugins/ml2/ml2_conf.ini 中的组成层 2（ML2）中添加 dns：
extension_drivers=port_security,qos,dns
6、在 Designate 中添加区域：
# openstack zone create –email=admin@rhlab.dev rhlab.dev.
在 rhlab.dev 区域中添加记录：
# openstack recordset create --record '192.168.1.230' --type A rhlab.dev. Test
Designate 现在就安装和配置好了。
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