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

时间：2024-03-19 12:45:15
用 OpenStack Designate 构建一个 DNS 即服务（DNSaaS） | Linux 中国学习如何安装和配置 Designate，这是一个 OpenStack 的多租户 DNS 即服务（DNSaaS）。-- Amjad Yaseen

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

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

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 的最新版本，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：



  1. # yum install openstack-designate-* bind bind-utils -y


2、创建 Designate 数据库和用户：




    

  1. MariaDB [(none)]> CREATE DATABASE designate CHARACTER SET utf8 COLLATE utf8_general_ci;
    2. 

  2.  
    3. 

  3. MariaDB [(none)]> GRANT ALL PRIVILEGES ON designate.* TO \
    4. 

  4. 'designate'@'localhost' IDENTIFIED BY 'rhlab123';
    5. 

    6. 

  6. MariaDB [(none)]> GRANT ALL PRIVILEGES ON designate.* TO 'designate'@'%' \
    7. 

  7. IDENTIFIED BY 'rhlab123';
    8. 



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Remote Name Daemon Control（RNDC）功能正常。


配置 bind（DNS 服务器）


1、生成 RNDC 文件：




    

  1. rndc-confgen -a -k designate -c /etc/rndc.key -r /dev/urandom
    2. 

    3. 

  3. cat <<EOF> etcrndc.conf
    4. 

  4. include "/etc/rndc.key";
    5. 

  5. options {
    6. 

  6.  default-key "designate";
    7. 

  7.  default-server {{ DNS_SERVER_IP }};
    8. 

  8.  default-port 953;
    9. 

  9. };
    10. 

  10. EOF
    11. 



2、将下列配置添加到 named.conf：




    

  1. include "/etc/rndc.key"; 
    2. 

  2. controls {
    3. 

  3.  inet {{ DNS_SERVER_IP }} allow { localhost;{{ CONTROLLER_SERVER_IP }}; } keys { "designate"; };
    4. 

  4. };
    5. 



在 option 节中，添加：




    

  1. options {
    2. 

  2.  ...
    3. 

  3.  allow-new-zones yes;
    4. 

  4.  request-ixfr no;
    5. 

  5.  listen-on port 53 { any; };
    6. 

  6.  recursion no;
    7. 

  7.  allow-query { 127.0.0.1; {{ CONTROLLER_SERVER_IP }}; };
    8. 

  8. };
    9. 



添加正确的权限：




    

  1. chown named:named /etc/rndc.key
    2. 

  2. chown named:named /etc/rndc.conf
    3. 

  3. chmod 600 /etc/rndc.key
    4. 

  4. chown -v root:named /etc/named.conf
    5. 

  5. chmod g+w /var/named
    6. 

    7. 

  7. # systemctl restart named
    8. 

  8. # setsebool named_write_master_zones 1
    9. 



3、把 rndc.key 和 rndc.conf 推入 OpenStack 控制节点：




  1. # scp -r /etc/rndc* {{ CONTROLLER_SERVER_IP }}:/etc/


创建 OpenStack Designate 服务和端点


输入：




    

  1. # openstack user create --domain default --password-prompt designate
    2. 

  2. # openstack role add --project services --user designate admin
    3. 

  3. # openstack service create --name designate --description "DNS" dns
    4. 

    5. 

  5. # openstack endpoint create --region RegionOne dns public http://{{ CONTROLLER_SERVER_IP }}:9001/
    6. 

  6. # openstack endpoint create --region RegionOne dns internal http://{{ CONTROLLER_SERVER_IP }}:9001/ 
    7. 

  7. # openstack endpoint create --region RegionOne dns admin http://{{ CONTROLLER_SERVER_IP }}:9001/
    8. 



配置 Designate 服务


1、编辑 /etc/designate/designate.conf：


在 [service:api] 节配置 auth_strategy：




    

  1. [service:api]
    2. 

  2. listen = 0.0.0.0:9001
    3. 

  3. auth_strategy = keystone
    4. 

  4. api_base_uri = http://{{ CONTROLLER_SERVER_IP }}:9001/
    5. 

  5. enable_api_v2 = True
    6. 

  6. enabled_extensions_v2 = quotas, reports
    7. 



在 [keystone_authtoken] 节配置下列选项：




    

  1. [keystone_authtoken]
    2. 

  2. auth_type = password
    3. 

  3. username = designate
    4. 

  4. password = rhlab123
    5. 

  5. project_name = service
    6. 

  6. project_domain_name = Default
    7. 

  7. user_domain_name = Default
    8. 

  8. www_authenticate_uri = http://{{ CONTROLLER_SERVER_IP }}:5000/
    9. 

  9. auth_url = http://{{ CONTROLLER_SERVER_IP }}:5000/ 
    10. 



在 [service:worker] 节，启用 worker 模型：




    

  1. enabled = True
    2. 

  2. notify = True
    3. 



在 [storage:sqlalchemy] 节，配置数据库访问：




    

  1. [storage:sqlalchemy]
    2. 

  2. connection = mysql+pymysql://designate:[email protected]{{ CONTROLLER_SERVER_IP }}/designate
    3. 



填充 Designate 数据库：




  1. # 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：




    

  1. - name: default
    2. 

  2.  # The name is immutable. There will be no option to change the name after
    3. 

  3.  # creation and the only way will to change it will be to delete it
    4. 

  4.  # (and all zones associated with it) and recreate it.
    5. 

  5.  description: Default Pool
    6. 

    7. 

  7.  attributes: {}
    8. 

    9. 

  9.  # List out the NS records for zones hosted within this pool
    10. 

  10.  # This should be a record that is created outside of designate, that
    11. 

  11.  # points to the public IP of the controller node.
    12. 

  12.  ns_records:
    13. 

  13.  - hostname: {{Controller_FQDN}}. # Thisis mDNS
    14. 

  14.  priority: 1
    15. 

    16. 

  16.  # List out the nameservers for this pool. These are the actual BIND servers.
    17. 

  17.  # We use these to verify changes have propagated to all nameservers.
    18. 

  18.  nameservers:
    19. 

  19.  - host: {{ DNS_SERVER_IP }}
    20. 

  20.  port: 53
    21. 

    22. 

  22.  # List out the targets for this pool. For BIND there will be one
    23. 

  23.  # entry for each BIND server, as we have to run rndc command on each server
    24. 

  24.  targets:
    25. 

  25.  - type: bind9
    26. 

  26.  description: BIND9 Server 1
    27. 

    28. 

  28.  # List out the designate-mdns servers from which BIND servers should
    29. 

  29.  # request zone transfers (AXFRs) from.
    30. 

  30.  # This should be the IP of the controller node.
    31. 

  31.  # If you have multiple controllers you can add multiple masters
    32. 

  32.  # by running designate-mdns on them, and adding them here.
    33. 

  33.  masters:
    34. 

  34.  - host: {{ CONTROLLER_SERVER_IP }}
    35. 

  35.  port: 5354
    36. 

    37. 

  37.  # BIND Configuration options
    38. 

  38.  options:
    39. 

  39.  host: {{ DNS_SERVER_IP }}
    40. 

  40.  port: 53
    41. 

  41.  rndc_host: {{ DNS_SERVER_IP }}
    42. 

  42.  rndc_port: 953
    43. 

  43.  rndc_key_file: /etc/rndc.key
    44. 

  44.  rndc_config_file: /etc/rndc.conf
    45. 



填充 Designate 池：




  1. su -s /bin/sh -c "designate-manage pool update" designate


3、启动 Designate 中心和 API 服务：




  1. systemctl enable --now designate-central designate-api


4、验证 Designate 服务运行：




    

  1. # openstack dns service list
    2. 

    3. 

  3. +--------------+--------+-------+--------------+
    4. 

  4. | service_name | status | stats | capabilities |
    5. 

  5. +--------------+--------+-------+--------------+
    6. 

  6. | central | UP | - | - |
    7. 

  7. | api | UP | - | - |
    8. 

  8. | mdns | UP | - | - |
    9. 

  9. | worker | UP | - | - |
    10. 

  10. | producer | UP | - | - |
    11. 

  11. +--------------+--------+-------+--------------+
    12. 



用外部 DNS 配置 OpenStack Neutron


1、为 Designate 服务配置 iptables：




    

  1. # iptables -I INPUT -p tcp -m multiport --dports 9001 -m comment --comment "designate incoming" -j ACCEPT
    2. 

  2.  
    3. 

  3. # iptables -I INPUT -p tcp -m multiport --dports 5354 -m comment --comment "Designate mdns incoming" -j ACCEPT
    4. 

  4.  
    5. 

  5. # iptables -I INPUT -p tcp -m multiport --dports 53 -m comment --comment "bind incoming" -j ACCEPT
    6. 

  6.  
    7. 

  7. # iptables -I INPUT -p udp -m multiport --dports 53 -m comment --comment "bind/powerdns incoming" -j ACCEPT
    8. 

  8.  
    9. 

  9. # iptables -I INPUT -p tcp -m multiport --dports 953 -m comment --comment "rndc incoming - bind only" -j ACCEPT
    10. 

  10.  
    11. 

  11. # service iptables save; service iptables restart
    12. 

  12. # setsebool named_write_master_zones 1
    13. 



2、 编辑 /etc/neutron/neutron.conf 的 [default] 节：




  1. external_dns_driver = designate


3、 在 /etc/neutron/neutron.conf 中添加 [designate] 节：




    

  1. [designate]
    2. 

  2. url = http://{{ CONTROLLER_SERVER_IP }}:9001/v2 ## This end point of designate
    3. 

  3. auth_type = password
    4. 

  4. auth_url = http://{{ CONTROLLER_SERVER_IP }}:5000
    5. 

  5. username = designate
    6. 

  6. password = rhlab123
    7. 

  7. project_name = services
    8. 

  8. project_domain_name = Default
    9. 

  9. user_domain_name = Default
    10. 

  10. allow_reverse_dns_lookup = True
    11. 

  11. ipv4_ptr_zone_prefix_size = 24
    12. 

  12. ipv6_ptr_zone_prefix_size = 116 
    13. 



4、编辑 neutron.conf 的 dns_domain：




  1. dns_domain = rhlab.dev.


重启：




  1. # systemctl restart neutron-*


5、在 /etc/neutron/plugins/ml2/ml2_conf.ini 中的组成层 2（ML2）中添加 dns：




  1. extension_drivers=port_security,qos,dns


6、在 Designate 中添加区域：




  1. # openstack zone create –email=[email protected].dev rhlab.dev.


在 rhlab.dev 区域中添加记录：




  1. # openstack recordset create --record '192.168.1.230' --type A rhlab.dev. Test


Designate 现在就安装和配置好了。




via: https://opensource.com/article/19/4/getting-started-openstack-designate


作者：Amjad Yaseen 选题：lujun9972 译者：wxy 校对：wxy


本文由 LCTT 原创编译，Linux中国 荣誉推出

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



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