arno/stuff
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Update 'k3s: enable DNS resolution from host to k3s services'

Andy 2023-01-24 12:39:28 +00:00
parent 13898c894d
commit b83bb21f03
1 changed files with 36 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
k3s%3A-enable-DNS-resolution-from-host-to-k3s-services.md Normal file

@ -0,0 +1,36 @@
The following enables DNS resolution from host to k3s services for `default.svc.cluster.local` & `svc.cluster.local` domains:
```
sudo mkdir -p /etc/systemd/resolved.conf.d
cat <<EOF | sudo tee /etc/systemd/resolved.conf.d/k3s-kube-dns.conf
[Resolve]
DNS=$(kubectl -n kube-system get ep kube-dns -o jsonpath='{.subsets[0].addresses[0].ip}')
FallbackDNS=
Domains=default.svc.cluster.local svc.cluster.local
DNSSEC=no
Cache=no-negative
EOF
sudo systemctl restart systemd-resolved
```
Verification:
```
$ resolvectl
Global
Protocols: -LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
resolv.conf mode: stub
Current DNS Server: 10.42.0.2
DNS Servers: 10.42.0.2
DNS Domain: default.svc.cluster.local svc.cluster.local
...
$ host kube-dns.kube-system.svc.cluster.local
kube-dns.kube-system.svc.cluster.local has address 10.43.0.10
$ nc -vz kube-dns.kube-system.svc.cluster.local 53
Connection to kube-dns.kube-system.svc.cluster.local (10.43.0.10) 53 port [tcp/domain] succeeded!
```