dnsmasq¶
Light software that can act both as DNS server/cache and as DHCP server.
In the virtual LAN, only the DNS part is used, in order to resolve internal names with first-level domain .scambi (not a TLD).
These document is for "normal" servers.
Procedure¶
apt install dnsmasq
nano /etc/default/dnsmasq
add ",.hosts,.resolv" to CONFIG_DIR variable
check that the line below is decommented in the file /etc/dnsmasq.conf
conf-dir=/etc/dnsmasq.d/,*.conf
nano /etc/dnsmasq.d/dnsmasq.resolv
nameserver 192.168.64.1
nameserver 192.168.64.2
nameserver 9.9.9.9
nano /etc/dnsmasq.d/dnsmasq.conf
#not read /etc/hosts
no-hosts
# don't read /etc/resolv.conf
#no-resolv
resolv-file=/etc/dnsmasq.d/dnsmasq.resolv
# follow order of servers
strict-order
# number of names in cache
cache-size=4096
# add domain to simple names
expand-hosts
# ttl cache
max-cache-ttl=1800
# interface
interface=lo
# accept dns queries only from address of local subnet
local-service
# force binding only on selected interfaces
bind-interfaces
# not forward query without fqdn
domain-needed
edit the file /etc/resolv.conf by inserting the following line at the top
nameserver 127.0.0.1
edit the file /etc/dhcp/dhclient.conf, if present, by uncommenting the following line
prepend domain-name-servers 127.0.0.1;
enable and start the service
systemctl enable --now dnsmasq
systemctl restart dnsmasq
Fix DNS - Contabo¶
nano /etc/network/interfaces
...
dns-nameservers 127.0.0.1 213.136.95.10 213.136.95.11
...
systemctl disable --now resolvconf
rm /run/dnsmasq/resolv.conf
rm /var/run/resolvconf/interface/*
apt remove resolvconf
systemctl restart dnsmasqls -l /etc/resolv.conf
if the file /etc/resolv.conf is a symbolic link:
rm /etc/resolv.conf
nano /etc/resolv.conf
nameserver 127.0.0.1
Creata: 2021-06-05