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Re: Node to Node Networking Error



Hi Naveen;

You are right, but I still need guidance.

Cluster is deployed on AWS. 

[root ip-10-20-4-38 network-scripts]# cat /etc/resolv.conf
nameserver 169.254.169.253 [AWS DNS]


And override it and I noticed that origin also add its dispatcher.

[root ip-10-20-4-38 /]# cd ./etc/NetworkManager/dispatcher.d/
[root ip-10-20-4-38 dispatcher.d]# ls -l
total 28
-rwxr-xr-x. 1 root root  175 Sep 12  2016 00-netreport
-rwxr-xr-x. 1 root root  100 Aug 18  2016 04-iscsi
-rwxr-xr-x. 1 root root 1120 Aug  9  2016 11-dhclient
-rwxr-xr-x. 1 root root  442 Jun 23  2015 20-chrony
-rwxr-xr-x. 1 root root   52 Apr 17 09:43 99-awsdns [added for AWS DNS, and overrides resolv.conf]
-rwxr-xr-x. 1 root root 4000 Apr 17 10:30 99-origin-dns.sh [Origin added after installation]
-rwxr-xr-x. 1 root root  719 Dec 23 11:37 cloud-init-azure-hook
drwxr-xr-x. 2 root root    6 Mar 29 12:03 no-wait.d
drwxr-xr-x. 2 root root    6 Mar 29 12:03 pre-down.d
drwxr-xr-x. 2 root root    6 Mar 29 12:03 pre-up.d

I needed AWS DNS to resolve host names in order to complete installation successfully for ssh connections, required by ansible playbook. And I am probably missing smh here.

I followed installation guide from [https://docs.openshift.com/container-platform/3.5/install_config/install/prerequisites.html]

VERSION [Container Platform 3.5]
[root ip-10-20-4-38 dispatcher.d]# oc version
oc v3.5.5.5
kubernetes v1.5.2+43a9be4
features: Basic-Auth GSSAPI Kerberos SPNEGO

openshift v3.5.5.5
kubernetes v1.5.2+43a9be4


Kind regards


On 26 Apr 2017, at 14:37, Naveen Kumar Tangallapally <naveen tangallapally cloudgensys com> wrote:

Hi Baris,

can i let me know the steps for setting up for the DNS.

because my ods are going in error state.

Regards...



Regards....
NAVEEN KUMAR T
Openshift Administrator
Mob:+91 9550220793


On Wed, Apr 26, 2017 at 5:02 PM, Barış Aydınöz <baris hazelcast com> wrote:
Problem:

A Pod in Master can ping to a node in Node, whereas trace path fails. Also, TCP connection between these pods give timeout errors.

We have below nodes

NODES
[root ip-10-20-4-38 network-scripts]# oc get nodes
NAME                       STATUS    AGE
master.hazelcast-ocp.com   Ready     8d
node1.hazelcast-ocp.com    Ready     8d

Master is also a node

SUBNET
[root ip-10-20-4-38 network-scripts]# oc get hostsubnet
NAME                       HOST                       HOST IP          SUBNET


PODS
[root ip-10-20-4-38 network-scripts]# oc get pods
NAME                            READY     STATUS    RESTARTS   AGE
docker-registry-1-f9lcn         1/1       Running   1          2d
hz-rc-9h10b                     1/1       Running   1          15m
hz-rc-fc64l                     0/1       Running   0          16m
router-1-pfv0f                  1/1       Running   0          3h

[root ip-10-20-4-38 network-scripts]# oc describe pod hz-rc-9h10b
Name: hz-rc-9h10b
Namespace: default
Security Policy: restricted
Start Time: Wed, 26 Apr 2017 07:10:28 -0400
Labels: name=hazelcast-node-hz
Status: Running
IP: 10.129.0.61

[root ip-10-20-4-38 network-scripts]# oc describe pod hz-rc-fc64l
Name: hz-rc-fc64l
Namespace: default
Security Policy: restricted
Start Time: Wed, 26 Apr 2017 07:09:35 -0400
Labels: name=hazelcast-node-hz
Status: Running
IP: 10.128.0.100

From Master Node:
[root ip-10-20-4-38 network-scripts]# ip route get 10.129.0.61
10.129.0.61 dev tun0  src 10.128.0.1
    cache

[root ip-10-20-4-38 network-scripts]# ip a show dev tun0
10: tun0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 8951 qdisc noqueue state UNKNOWN qlen 1000
    link/ether e2:b5:07:a5:10:fd brd ff:ff:ff:ff:ff:ff
    inet 10.128.0.1/23 scope global tun0
       valid_lft forever preferred_lft forever
    inet6 fe80::e0b5:7ff:fea5:10fd/64 scope link
       valid_lft forever preferred_lft forever

[root ip-10-20-4-38 network-scripts]# tracepath 10.129.0.61
 1?: [LOCALHOST]                                         pmtu 8951
 1:  no reply
 2:  no reply
 3:  no reply

Could you please advice?

Thanks in advance


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