# 區域網路用 DNS 伺服器
# 摘要
使用 dnsmasq ，建置區域網路適用之簡易型 DNS 伺服器。
# 作業程序
# 1. 安裝前置作業。
停用作業系統的「主機名稱解析服務(resolved service)」。
sudo systemctl disable systemd-resolved
sudo systemctl stop systemd-resolved
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解除 symlink 設定。
ls -lh /etc/resolv.conf
sudo unlink /etc/resolv.conf
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建立新的「主機名稱解析服務設定檔」。
echo nameserver 8.8.8.8 | sudo tee /etc/resolv.conf
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# 2. 安裝軟體套件。
執行安裝指令。
sudo apt install dnsmasq
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設定「設定檔」。
sudoedit /etc/dnsmasq.conf
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【檔案內容】：
# Listen on this specific port instead of the standard DNS port
# (53). Setting this to zero completely disables DNS function,
# leaving only DHCP and/or TFTP.
port=53
# Never forward plain names (without a dot or domain part)
domain-needed
# Never forward addresses in the non-routed address spaces.
bogus-priv
# By default, dnsmasq will send queries to any of the upstream
# servers it knows about and tries to favour servers to are known
# to be up. Uncommenting this forces dnsmasq to try each query
# with each server strictly in the order they appear in
# /etc/resolv.conf
strict-order
# Set this (and domain: see below) if you want to have a domain
# automatically added to simple names in a hosts-file.
expand-hosts
# Set the domain for dnsmasq. this is optional, but if it is set, it
# does the following things.
# 1) Allows DHCP hosts to have fully qualified domain names, as long
# as the domain part matches this setting.
# 2) Sets the "domain" DHCP option thereby potentially setting the
# domain of all systems configured by DHCP
# 3) Provides the domain part for "expand-hosts"
# domain=thekelleys.org.uk
domain=ccc.tw.local
# Set Listen address
# listen-address=127.0.0.1 # Set to Server IP for network responses
listen-address=192.168.66.10 # Set to Server IP for network responses
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# 3. 啟動 dnsmasq 服務。
sudo systemctl restart dnsmasq
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# 4. 設定 dnsmasq 所需之 DNS 紀錄
編輯 hosts 檔案。
sudoedit /etc/hosts
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【檔案內容】：
192.168.66.10 blog.ccc.tw.local
192.168.66.10 app1.ccc.tw.local
192.168.66.10 app2.ccc.tw.local
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重啟 dnsmasq 服務。
sudo systemctl restart dnsmasq
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# 5. 驗證 dnsmasq 服務已能正常作業。
執行 dig 指令，查詢 DNS 記錄。
dig blog.ccc.tw.local
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dig blog.ccc.tw.local A +noall +answer
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# 參考資料
Install and Configure Dnsmasq on Ubuntu 22.04|20.04|18.04 (opens new window)
停用 NetworkManager 服務
sudo systemctl stop NetworkManager
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