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

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：

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Remote Name Daemon Control（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 <<EOF> 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 = 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。