Setup required to test DnsSwitch functionality
These steps are used to test DNSSwitch functionality within PROM POD
1. Place dnsSwitch.bash on core-dns master under /home/ubuntu
2
...
3. Make sure that site.conf is properly configured on site-A and site-B
...
.Following are the steps to create ssh key for remote core-dns connection
| Code Block |
|---|
a. As a root user, execute below command on coredns master (make sure to use the key name as coredns.key) :
$ ssh-keygen -t rsa -f coredns.key (hit Enter key for the prompts)
This creates two files: coredns.key and coredns.key.pub
b. verify below command works for root user without any prompts(because the key was added with root user):
ssh -i coredns.key root@<corednsHost>
c. Copy coredns.key and coredns.key.pub files to /dockerdata-nfs/coredns on all Master sites |
3. Make sure kubectl works on core-dns master
| Code Block |
|---|
#kubernetes cluster was installed using ubuntu, hence below does not work root@core-dns-master:/home/ubuntu# kubectl get pods -n onap The connection to the server localhost:8080 was refused - did you specify the right host or port? #copy kube config using root user to /root to make it work root@core-dns-master:/home/ubuntu# cp /home/ubuntu/.kube/ /root #verify kubectl works from root user root@core-dns-master:~# kubectl get pods --all-namespaces NAMESPACE NAME |
...
READY STATUS RESTARTS AGE kube-system coredns-7fd6694686- |
...
dnwt7 1/1 Running 2 |
...
11d kube-system coredns-7fd6694686-jrj92 1/1 Running 2 11d kube-system etcd-core-dns-master 1/1 Running |
...
|
...
|
...
2 |
...
|
...
12d kube-system kube-apiserver-core-dns-master 1/1 |
...
Running 10 12d kube-system kube-controller-manager- |
...
core-dns-master 1/1 Running 8 |
...
4.Following are the steps to create ssh key for remote core-dns connection
...
12d kube-system kube-proxy-j4wlv 1/1 Running 2 12d kube-system kube-proxy-q74fc 1/1 Running 2 12d kube-system kube-scheduler-core-dns-master 1/1 Running 7 12d |
...
kube- |
...
system tiller-deploy-84f4c8bb78-skvlp 1/1 Running 2 12d kube-system weave-net-lq4ls 2/2 Running 7 12d kube-system |
...
|
...
weave- |
...
net-rm6z4 |
...
|
...
|
...
|
...
|
...
|
...
|
...
|
...
|
...
|
...
|
...
2/2 Running 15 |
...
|
...
5. Make sure
...
12d
|
6. Execute sdnc.
...
makeActive script from Site A or Site
...
B to trigger manual failover and DNSSwitch
| Code Block |
|---|
root@k8s-master:/home/ubuntu# ./sdnc. |
...
makeActive |
7. You may verify the logs on core-dns
...
master :
| Code Block |
|---|
root@core-dns-master:~$ ll *.log
-rw-r--r-- 1 root root 12002 May 1 11:28 dnsSwitch.log
root@core-dns-master:~$
root@core-dns-master:~$ cat dnsSwitch.log
Fri Apr 27 09:16:10 EDT 2018 script called from site: 10.147.113.136
Fri Apr 27 09:16:10 EDT 2018 logging current dns entry
Server: 10.96.0.10
Address: 10.96.0.10#53
Name: sdnc.example.com
Address: 10.147.112.139
Fri Apr 27 09:16:10 EDT 2018 editing dns zone
Fri Apr 27 09:16:10 EDT 2018 verify if dns domain address exist in configuration for given app: sdnc
Fri Apr 27 09:16:10 EDT 2018 dns domain address was found
Fri Apr 27 09:16:10 EDT 2018 dns zone file edited
Fri Apr 27 09:16:10 EDT 2018 editing coredns configmap
configmap "coredns" deleted
configmap "coredns" created
Fri Apr 27 09:16:11 EDT 2018 coredns configmap edited
Fri Apr 27 09:16:11 EDT 2018 waiting for dns cache time
Fri Apr 27 09:17:01 EDT 2018 sending refresh signal for coredns configmap
Fri Apr 27 09:17:01 EDT 2018 Completed executing sdnc.dnsswitch on host: core-dns-master
|