Listen tcp :53: bind: permission denied ERROR!! #6716
Description
What happened:
kubectl get po -A
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-flannel kube-flannel-ds-962vp 1/1 Running 0 15m
kube-flannel kube-flannel-ds-qs6xr 1/1 Running 0 15m
kube-system coredns-7db6d8ff4d-6w776 0/1 CrashLoopBackOff 1 (10s ago) 12s
kube-system coredns-7db6d8ff4d-99tng 0/1 CrashLoopBackOff 1 (9s ago) 12s
kube-system etcd-controlplane 1/1 Running 0 12m
kube-system kube-apiserver-controlplane 1/1 Running 0 12m
kube-system kube-controller-manager-controlplane 1/1 Running 0 12m
kube-system kube-proxy-hbt5b 1/1 Running 0 12m
kube-system kube-proxy-x96js 1/1 Running 0 11m
kube-system kube-scheduler-controlplane 1/1 Running 0 12m
I was setting up the single-node k8s cluster (1 controlplane and 1 worker node). After going through all the installation process from the official k8s site -> at last, after deploying the network plugin on the k8s cluster. CoreDNS pods went into a Crashloopbackoff state. I did check for the container logs and found the following error message:
listen tcp :53: bind: permission denied
What you expected to happen:
Both coreDNS pods should be in the running state, after deploying the network plugin.
How to reproduce it (as minimally and precisely as possible):
Simply follow the steps from the official k8s site.
Anything else we need to know?:
I did some tests, and I used 1024 instead of 53 port, and it started to work.
kubectl logs -n kube-system coredns-7db6d8ff4d-wchnq
.:1024
[INFO] plugin/reload: Running configuration SHA512 = e20da72760199c1bc59098f3ae16621ae48df8f7756e50bd0dfa5553ccb7be57af61562fff46a43fdcce51ac086b26aa19929386004908ad3afe3aea9b06316a
CoreDNS-1.11.1
linux/amd64, go1.20.7, ae2bbc2
Environment:
- the version of CoreDNS: registry.k8s.io/coredns/coredns:v1.11.1
- Corefile: The below content is from the
corednsconfigMap.
Corefile: |
.:53 {
errors
health {
lameduck 5s
}
ready
kubernetes cluster.local in-addr.arpa ip6.arpa {
pods insecure
fallthrough in-addr.arpa ip6.arpa
ttl 30
}
prometheus :9153
forward . /etc/resolv.conf {
max_concurrent 1000
}
cache 30
loop
reload
loadbalance
}
- logs, if applicable:
listen tcp :53: bind: permission denied
- OS (e.g:
cat /etc/os-release):
PRETTY_NAME="Ubuntu 22.04.4 LTS"
NAME="Ubuntu"
VERSION_ID="22.04"
VERSION="22.04.4 LTS (Jammy Jellyfish)"
VERSION_CODENAME=jammy
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=jammy