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From: https://issues.redhat.com/browse/RUN-1739
1. The --dns-add command will not check the dns server value, it just accept any value given from the command line:
[root@bootp-73-3-203 ~]# podman network update test --dns-add fake
test
[root@bootp-73-3-203 ~]# podman inspect test
[
{
"name": "test",
"id": "a8f8cdd3f7ac06d3d71c4b5bacdb349a63fd6a0b23f96ea95e9c533eea80fc30",
"driver": "bridge",
"network_interface": "podman1",
"created": "2023-03-10T16:45:24.235264659+08:00",
"subnets": [
{
"subnet": "10.89.0.0/24",
"gateway": "10.89.0.1"
}
],
"ipv6_enabled": false,
"internal": false,
"dns_enabled": true,
"network_dns_servers": [
"fake"
],
"ipam_options": {
"driver": "host-local"
}
}
]
2. When we try to drop the last dns server value from the network, it will report error. But after that the value is actually removed.
[root@bootp-73-3-203 ~]# podman network update test --dns-drop fake
error: The argument '--network-dns-servers <NETWORK_DNS_SERVERS>' requires a value but none was supplied
For more information try --help
Error: netavark: : EOF
[root@bootp-73-3-203 ~]# podman inspect test
[
{
"name": "test",
"id": "a8f8cdd3f7ac06d3d71c4b5bacdb349a63fd6a0b23f96ea95e9c533eea80fc30",
"driver": "bridge",
"network_interface": "podman1",
"created": "2023-03-10T16:45:24.235264659+08:00",
"subnets": [
{
"subnet": "10.89.0.0/24",
"gateway": "10.89.0.1"
}
],
"ipv6_enabled": false,
"internal": false,
"dns_enabled": true,
"ipam_options": {
"driver": "host-local"
}
}
]
3. With the default setup container can access with default gateway. But after we deleted the last dns-server from the network, it can not access any server with nslookup. Here is the details:
[root@bootp-73-3-203 ~]# podman network create test
test
[root@bootp-73-3-203 ~]# podman run -d --name con1 --network test quay.io/libpod/busybox top
1c157cce9ab41698d2df4dac6542f143ac4f1b8d0ac15325f85230b7be4e3ee8
[root@bootp-73-3-203 ~]# podman network inspect test
[
{
"name": "test",
"id": "a8f8cdd3f7ac06d3d71c4b5bacdb349a63fd6a0b23f96ea95e9c533eea80fc30",
"driver": "bridge",
"network_interface": "podman1",
"created": "2023-03-10T16:45:24.235264659+08:00",
"subnets": [
{
"subnet": "10.89.0.0/24",
"gateway": "10.89.0.1"
}
],
"ipv6_enabled": false,
"internal": false,
"dns_enabled": true,
"ipam_options": {
"driver": "host-local"
}
}
]
[root@bootp-73-3-203 ~]# podman exec con1 nslookup google.com
Server: 10.89.0.1
Address: 10.89.0.1:53
Non-authoritative answer:
Name: google.com
Address: 172.217.194.139
Name: google.com
Address: 172.217.194.100
Name: google.com
Address: 172.217.194.102
Name: google.com
Address: 172.217.194.138
Name: google.com
Address: 172.217.194.101
Name: google.com
Address: 172.217.194.113
*** Can't find google.com: No answer
[root@bootp-73-3-203 ~]# podman network update test --dns-add fake
test
[root@bootp-73-3-203 ~]# podman inspect test
[
{
"name": "test",
"id": "a8f8cdd3f7ac06d3d71c4b5bacdb349a63fd6a0b23f96ea95e9c533eea80fc30",
"driver": "bridge",
"network_interface": "podman1",
"created": "2023-03-10T16:45:24.235264659+08:00",
"subnets": [
{
"subnet": "10.89.0.0/24",
"gateway": "10.89.0.1"
}
],
"ipv6_enabled": false,
"internal": false,
"dns_enabled": true,
"network_dns_servers": [
"fake"
],
"ipam_options": {
"driver": "host-local"
}
}
]
[root@bootp-73-3-203 ~]# podman network update test --dns-drop fake
error: The argument '--network-dns-servers <NETWORK_DNS_SERVERS>' requires a value but none was supplied
For more information try --help
Error: netavark: : EOF
[root@bootp-73-3-203 ~]# podman inspect test
[
{
"name": "test",
"id": "a8f8cdd3f7ac06d3d71c4b5bacdb349a63fd6a0b23f96ea95e9c533eea80fc30",
"driver": "bridge",
"network_interface": "podman1",
"created": "2023-03-10T16:45:24.235264659+08:00",
"subnets": [
{
"subnet": "10.89.0.0/24",
"gateway": "10.89.0.1"
}
],
"ipv6_enabled": false,
"internal": false,
"dns_enabled": true,
"ipam_options": {
"driver": "host-local"
}
}
]
[root@bootp-73-3-203 ~]# podman exec con1 nslookup google.com
;; connection timed out; no servers could be reached
nslookup: write to '10.89.0.1': Connection refused
Hi Aditya Rajan Can you help to check this? Thanks a lot.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (Moderate: container-tools:rhel8 security and bug fix update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHSA-2023:6939