Neutron dhcp-agent 之 dnsmasq

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dnsmasq --no-hosts --no-resolv --strict-order--bind-interfaces --interface=tap746570b9-2b --except-interface=lo--pid-file=/var/lib/quantum/dhcp/3e16cd2f-c693-49b4-91a7-2a65912ec152/pid--dhcp-hostsfile=/var/lib/quantum/dhcp/3e16cd2f-c693-49b4-91a7-2a65912ec152/host--dhcp-optsfile=/var/lib/quantum/dhcp/3e16cd2f-c693-49b4-91a7-2a65912ec152/opts--dhcp-script=/usr/bin/quantum-dhcp-agent-dnsmasq-lease-update --leasefile-ro--dhcp-range=set:tag0,12.0.0.192,static,120s--conf-file= --domain=openstacklocal

重要参数作用简介：

--bind-interfaces --interface=tap746570b9-2b --except-interface=lo
作用：使多个dnsmasq实例可以同时运行在同一台主机上并监听不同的interface

--dhcp-hostsfile=/var/lib/quantum/dhcp/3e16cd2f-c693-49b4-91a7-2a65912ec152/host
作用：读取IP与虚拟机的静态映射关系，该文件改变后dnsmasq会自动重新加载，不需要重启

--dhcp-optsfile=/var/lib/quantum/dhcp/3e16cd2f-c693-49b4-91a7-2a65912ec152/opts
作用：指定DNS服务器地址等选项

--dhcp-script=/usr/bin/quantum-dhcp-agent-dnsmasq-lease-update --leasefile-ro作用：lease信息更新与通知--dhcp-range=set:tag0,12.0.0.192,static,120s作用：重点在于static参数，该参数限制dnsmasq只能为dhcp-hostsfile包含的主机提供DHCP服务相关链接：
dnsmasq manpagednsmasq FAQ

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