Change DNS setting in Network IP Pool

[DustinSnijders]

Hi,

Due to a migration of our DNS servers, I've to change the IP-addresses of the DNS servers defined in the (currently used) IP pools of our BDE server. There is a Hadoop cluster with a large amount of data running using this pool and I don't like to deploy the cluster again. Reboot the cluster is no issue, so I planned the DNS settings for the cluster-nodes should change after reboot. Unlikely I could not change DNS settings. Is there a (possibly non-elegant) way changing these parameters for the Pool?

Cheers,

Dustin

[jessehuvmw · Accepted solution]

Hi Dustin,

BDE doesn't provide interface to modify the DNS server of network added in BDE.  You have to modify the BDE database to make it.  Here is the solution :

1. Login BDE server as user serengeti

2. Execute this command :  echo "update network set dns1 = 'the_new_dns_server_ip' where name = 'the_network_name'; \q" | psql

3. Apply the new DNS server. There are two approach. You can choose any one.

  a) Login BDE CLI and execute "cluster stop --name ..." and "cluster start --name ..." to reboot the VMs in the cluster, then the new DNS server will be applied.

  b) On BDE Server, execute "serengeti-ssh.sh cluster_name "sudo sed -i 's|nameserver.*|nameserver the_new_dns_server_ip|g' /etc/resolv.conf". The new DNS server should take effect immediately.

Thanks for using BDE.

Jesse @BDE

[DustinSnijders]

Hi Jesse,

Thanks for the information. It solved our migration issue.

In addition (and quite logic): the second DNS server can be set using 'dns2' as variable in the same commandline.

Cheers,

Dustin

[jessehuvmw]

Glad to hear it works for you. You're right that dns2 can be set like this :  echo "update network set dns1 = 'the_new_dns_server1_ip' and dns2 = 'the_new_dns_server2_ip' where name = 'the_network_name'; \q" | psql