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Dnsmasq FAQ

dnsmasq: failed to create inotify: No file descriptors available​

# 128
sysctl fs.inotify.max_user_instances

sudo sysctl fs.inotify.max_user_instances=8192

dnsmasq: setting capabilities failed: Operation not permitted​

  • Docker 里遇到
  • 用 root 启动
dnsmasq --user=root

dnsmasq: failed to bind DHCP server socket: Address in use​

  • 67 端口被占用
  • 使用 bind-interfaces

libvirtd dnsmasq​

/usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
##WARNING:  THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE
##OVERWRITTEN AND LOST.  Changes to this configuration should be made using:
##    virsh net-edit default
## or other application using the libvirt API.
##
## dnsmasq conf file created by libvirt
strict-order
pid-file=/var/run/libvirt/network/default.pid
except-interface=lo
bind-dynamic
interface=virbr0
dhcp-range=192.168.122.2,192.168.122.254,255.255.255.0
dhcp-no-override
dhcp-authoritative
dhcp-lease-max=253
dhcp-hostsfile=/var/lib/libvirt/dnsmasq/default.hostsfile
addn-hosts=/var/lib/libvirt/dnsmasq/default.addnhosts

dnsmasq as​

auth-server=localhost
auth-zone=localhost,127.0.0.0/24
# 会解析所有的 cluster.internal 结尾域名
# x.cluster.internal
# x.x.cluster.internal
address=/cluster.internal/192.168.1.1

所有域名 CNAME 为其他域名​

# 所有 example.com 都会 CNAME 为 wener.me
cname=*.example.com,wener.me,180
auth-server=example.com
auth-zone=example.com