了解如何为OpenStack安装和配置一个多租户的DNS-as-a-service (DNSaaS)
该服务包括用于域和记录管理的REST API、用于与Neutron集成的框架和对Bind9的集成支持服务。
你可以考虑以下DNSaaS:
1.用于管理区和记录的规范的REST API
2.自动生成的记录(使用OpenStack集成)
3.支持多个权限域名服务器
4.主持多个项目/组织
本文解释了如何在CentOS或Red Hat Enterprise Linux 7 (RHEL 7)上手动安装和配置最新版本Designate service，但是您可以在其他发行版上进行相同的安装和配置。
在OpenStack上安装Designate
我为bind和designate匹配了一些Ansible role，用于演示我的GitHub存储库中的设置。此设置假定bind服务是OpenStack控制器节点上的外部服务(即使您可以在本地安装bind)。
第一步：在OpenStack控制器上安装Designate 和 Bind：
代码语言：javascript复制# yum install openstack-designate-* bind bind-utils -y第二步：创建Designate数据库和用户：
代码语言：javascript复制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:要使Remote Name Daemon Control (RNDC)正常工作，必须将Bind包安装在控制器端。
配置bind(DNS 服务器)
第一步：创建RNDC文件：
代码语言：javascript复制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第二步：在name .conf中添加以下内容:
代码语言：javascript复制include "/etc/rndc.key"; controls { inet {{ DNS_SERVER_IP }} allow { localhost;{{ CONTROLLER_SERVER_IP }}; } keys { "designate"; }; };在Option部分，添加:
代码语言：javascript复制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:
代码语言：javascript复制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第三步：将rndc.key和rndc.conf放入OpenStack控制器中：
代码语言：javascript复制# scp -r /etc/rndc* {{ CONTROLLER_SERVER_IP }}:/etc/创建OpenStack Designate服务和端点
输入：
代码语言：javascript复制# 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
第一步：编辑/etc/designate/designate.conf:
在[service:api]部分，配置auth_strategy:
代码语言：javascript复制 [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]部分中，配置以下选项：
代码语言：javascript复制[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]部分，启用worker模型:
代码语言：javascript复制enabled = True
notify = True在[storage:sqlalchemy]部分，配置数据库访问:
代码语言：javascript复制[storage:sqlalchemy]
connection = mysql pymysql://designate:rhlab123@{{ CONTROLLER_SERVER_IP }}/designate填充Designate数据库:
代码语言：javascript复制# su -s /bin/sh -c "designate-manage database sync" designate第二步：创建 Designate的 pools.yaml 文件 (有 target and bind 细节)：
编辑/etc/designate/pools.yaml:
代码语言：javascript复制- 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库:
代码语言：javascript复制su -s /bin/sh -c "designate-manage pool update" designate第三步：开始Designate central 和 API服务：
代码语言：javascript复制systemctl enable --now designate-central designate-api第四步：验证Designate 服务已开启：
代码语言：javascript复制# openstack dns service list
-------------- -------- ------- --------------
| service_name | status | stats | capabilities |
-------------- -------- ------- --------------
| central | UP | - | - |
| api | UP | - | - |
| mdns | UP | - | - |
| worker | UP | - | - |
| producer | UP | - | - |
-------------- -------- ------- -------------- 使用外部DNS配置OpenStack Neutron
第一步：为 Designate 服务配置iptables：
代码语言：javascript复制# 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第二步：编辑/etc/neutron/neutron.conf的[default]部分:
代码语言：javascript复制external_dns_driver = designate第三步：将[designate]部分加入/_etc/_neutron/neutron.conf:
代码语言：javascript复制[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第四步：在neutron.conf:里编辑dns_domain：
代码语言：javascript复制dns_domain = rhlab.dev.
# systemctl restart neutron-*第五步：在/etc/neutron/plugins/ml2/ml2_conf.ini模块层2 (ML2)驱动列表中添加dns:
代码语言：javascript复制extension_drivers=port_security,qos,dns第六步：在Designate 中添加区：
代码语言：javascript复制# openstack zone create –email=admin@rhlab.dev rhlab.dev.在rhlab.dev区添加一个新的记录:
代码语言：javascript复制# openstack recordset create --record '192.168.1.230' --type A rhlab.dev. TestDesignate现在就安装和配置完成了
