it was a working set up and no manual changes were made.

when we are trying to deploy application on aks; it fails to pull an image from the acr.

as per kubectl describe po output:

Failed to pull image "xyz.azurecr.io/xyz:-beta-68": [rpc error: code = Unknown desc = Error response from daemon: Get https://xyz.azurecr.io/v2/: dial tcp: lookup rxyz.azurecr.io on [::1]:53: read udp [::1]:46256->[::1]:53: read: connection refused, rpc error: code = Unknown desc = Error response from daemon: Get https://xyz.azurecr.io/v2/: dial tcp: lookup xyz.azurecr.io on [::1]:53: read udp [::1]:46112->[::1]:53: read: connection refused, rpc error: code = Unknown desc = Error response from daemon: Get https://xyz.azurecr.io/v2/: dial tcp: lookup xyz.azurecr.io on [::1]:53: read udp [::1]:36677->[::1]:53: read: connection refused]

while troubleshooting i realised, few nodes has the dns entry in /etc/resolv.conf where image pull is working fine without issue and few node doesn't have the dns entry in /etc/resolv.conf where the image pull fails.

and if i manually add dns entry to /etc/resolv.conf on the nodes that doesn't have the entry; the changes are reverted to the initial state withing few minutes.

is there a procedure to edit /etc/resolv.conf or fix image pull issues.?

CodePudding user response：

restart the cluster it will fix the problem ubuntu team have made some DNS issue so this problem started.

CodePudding user response：

Same issue here in k8s cluster in azure. We will try to restart the cluster/node/daemon.