用OpenStack Designate构建一个DNS即服务（DNSaaS）

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 designate
auth_type = password
auth_url = http://{{ CONTROLLER_SERVER_IP }}:5000
username = designate
password = rhlab123
project_name = services
project_domain_name = Default
user_domain_name = Default
allow_reverse_dns_lookup = True
ipv4_ptr_zone_prefix_size = 24
ipv6_ptr_zone_prefix_size = 116 

4、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

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