在绿联云上使用docker 安装pi-hole域名服务器，发现53端口被占用。使用ssh登录nas服务器,查看，
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| sudo netstat -tunlp | grep :53
[sudo] password for zhenlei:
tcp 0 0 192.100.2.1:53 0.0.0.0:* LISTEN 1928/dnsmasq
tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN 1657/dnsmasq
tcp 0 0 192.100.1.1:53 0.0.0.0:* LISTEN 1892/dnsmasq
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发现已经安装有dnsmasq，所以，可以直接使用。首先要确定dns服务器的配置文件位置：
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| ps aux | grep dnsmasq
dnsmasq 1657 0.0 0.0 41368 2380 ? S Sep27 1:01 /usr/sbin/dnsmasq -x /run/dnsmasq/dnsmasq.pid -u dnsmasq -7 /usr/ugreen/etc/dnsmasq/dnsmasq.d,.dpkg-dist,.dpkg-old,.dpkg-new --conf-file=/usr/ugreen/etc/dnsmasq/dnsmasq.conf --local-service --trust-anchor=.,20326,8,2,e06d44b80b8f1d39a95c0b0d7c65d08458e880409bbc683457104237c7f8ec8d
nobody 1842 0.0 0.0 11316 1704 ? S Sep27 0:00 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/vnet-nat0.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
root 1843 0.0 0.0 11204 864 ? S Sep27 0:00 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/vnet-nat0.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
nobody 1892 0.0 0.0 11316 1848 ? S Sep27 0:00 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/vnet-nat1.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
root 1893 0.0 0.0 11204 972 ? S Sep27 0:00 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/vnet-nat1.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
nobody 1928 0.0 0.0 11316 1972 ? S Sep27 0:00 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/vnet-host.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
root 1929 0.0 0.0 11204 804 ? S Sep27 0:00 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/vnet-host.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
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可以查看配置文件内容：
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| cat /usr/ugreen/etc/dnsmasq/dnsmasq.conf
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在目录 /usr/ugreen/etc/dnsmasq/dnsmasq.d/中可以创建自定义的域名：
sudo nano /usr/ugreen/etc/dnsmasq/dnsmasq.d/custom-domains.conf
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| # 内网自定义域名解析
address=/nfs.lan/192.168.31.8
address=/myapp.lan/192.168.31.100
address=/k8s2.lan/192.168.31.57
address=/k8s5.lan/192.168.31.78
address=/k8s6.lan/192.168.31.39
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重启域名服务器：
sudo systemctl restart dnsmasq
测试：
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| nslookup nfs.lan
Server: 127.0.0.1
Address: 127.0.0.1#53
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测试外网网址：
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| nslookup jiagoushi.cn
Non-authoritative answer:
Name: jiagoushi.cn
Address: 47.113.226.153
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还需要修改/usr/ugreen/etc/dnsmasq/dnsmasq.conf，使其侦听外部请求：
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| listen-address=127.0.0.1,::1,192.168.31.8
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修改路由器中DHCP服务器的DNS服务器，改为NAS的ip地址。
可以使用sudo netplay apply更新本地DNS服务器地址。