用 OpenStack Designate 構建一個 DNS 即服務(DNSaaS)
Designate 是一個多租戶的 DNS 即服務,它包括一個用於域名和記錄管理的 REST API 和集成了 Neutron 的框架,並支持 Bind9。
DNSaaS 可以提供:
- 一個管理區域和記錄的乾淨利落的 REST API
- 自動生成記錄(集成 OpenStack)
- 支持多個授權名字伺服器
- 可以託管多個項目/組織
![Designate's architecture](/data/attachment/album/201905/11/110945ruqt808b9bkk9tsu.png "Designate's architecture")
這篇文章解釋了如何在 CentOS 和 RHEL 上手動安裝和配置 Designate 的最新版本,但是同樣的配置也可以用在其它發行版上。
在 OpenStack 上安裝 Designate
在我的 GitHub 倉庫里,我已經放了 Ansible 的 bind 和 Designate 角色的示範設置。
這個設置假定 bing 服務是安裝 OpenStack 控制器節點之外(即使你可以在本地安裝 bind)。
1、在 OpenStack 控制節點上安裝 Designate 和 bind 軟體包:
# yum install openstack-designate-* bind bind-utils -y
2、創建 Designate 資料庫和用戶:
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 包必須安裝在控制節點之外才能使 遠程名字服務控制 (RNDC)功能正常。
配置 bind(DNS 伺服器)
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、將下列配置添加到 named.conf
:
include "/etc/rndc.key";
controls {
inet {{ DNS_SERVER_IP }} allow { localhost;{{ CONTROLLER_SERVER_IP }}; } keys { "designate"; };
};
在 option
節中,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 }}; };
};
添加正確的許可權:
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 控制節點:
# scp -r /etc/rndc* {{ CONTROLLER_SERVER_IP }}:/etc/
創建 OpenStack Designate 服務和端點
輸入:
# 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 服務
1、編輯 /etc/designate/designate.conf
:
在 [service:api]
節配置 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]
節配置下列選項:
[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]
節,啟用 worker 模型:
enabled = True
notify = True
在 [storage:sqlalchemy]
節,配置資料庫訪問:
[storage:sqlalchemy]
connection = mysql+pymysql://designate:rhlab123@{{ CONTROLLER_SERVER_IP }}/designate
填充 Designate 資料庫:
# su -s /bin/sh -c "designate-manage database sync" designate
2、 創建 Designate 的 pools.yaml
文件(包含 target 和 bind 細節):
編輯 /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、啟動 Designate 中心和 API 服務:
systemctl enable --now designate-central designate-api
4、驗證 Designate 服務運行:
# 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、為 Designate 服務配置 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、 編輯 /etc/neutron/neutron.conf
的 [default]
節:
external_dns_driver = designate
3、 在 /etc/neutron/neutron.conf
中添加 [designate]
節:
[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、編輯 neutron.conf
的 dns_domain
:
dns_domain = rhlab.dev.
重啟:
# systemctl restart neutron-*
5、在 /etc/neutron/plugins/ml2/ml2_conf.ini
中的組成層 2(ML2)中添加 dns
:
extension_drivers=port_security,qos,dns
6、在 Designate 中添加區域:
# openstack zone create –email=admin@rhlab.dev rhlab.dev.
在 rhlab.dev
區域中添加記錄:
# openstack recordset create --record '192.168.1.230' --type A rhlab.dev. Test
Designate 現在就安裝和配置好了。
via: https://opensource.com/article/19/4/getting-started-openstack-designate
作者:Amjad Yaseen 選題:lujun9972 譯者:wxy 校對:wxy
本文轉載來自 Linux 中國: https://github.com/Linux-CN/archive