用 OpenStack Designate 构建一个 DNS 即服务（DNSaaS）-工具盒子

学习如何安装和配置 Designate，这是一个 OpenStack 的多租户 DNS 即服务（DNSaaS）。

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 {#toc_1}

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Remote Name Daemon Control（RNDC）功能正常。

配置 bind（DNS 服务器） {#toc_2}

1、生成 RNDC 文件：

rndc-confgen -a -k designate -c /etc/rndc.key -r /dev/urandom
`cat <<EOF> etcrndc.conf
include "/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.key
chown named:named /etc/rndc.conf
chmod 600 /etc/rndc.key
chown -v root:named /etc/named.conf
chmod 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 {#toc_3}

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 {#toc_4}

1、编辑 /etc/designate/designate.conf：

在 [service:api] 节配置 auth_strategy：

[service:api]
listen = 0.0.0.0:9001
auth_strategy = keystone
api_base_uri = http://{{ CONTROLLER_SERVER_IP }}:9001/
enable_api_v2 = True
enabled_extensions_v2 = quotas, reports

在 [keystone_authtoken] 节配置下列选项：

[keystone_authtoken]
auth_type = password
username = designate
password = rhlab123
project_name = service
project_domain_name = Default
user_domain_name = Default
www_authenticate_uri = http://{{ CONTROLLER_SERVER_IP }}:5000/
auth_url = http://{{ CONTROLLER_SERVER_IP }}:5000/

在 [service:worker] 节，启用 worker 模型：

enabled = True
notify = 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</code></pre>



 
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     | -     | -            |
    +--------------+--------+-------+--------------+`



<br />



 
### 用外部 DNS 配置 OpenStack Neutron {#toc_5}


 
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



 
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。

 
   
*** ** * ** ***


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

 
作者：https://opensource.com/users/ayaseen 选题：https://github.com/lujun9972 译者：https://github.com/wxy 校对：https://github.com/wxy

 
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