Re: Changing a node IP address

[Cyril Scetbon]

Okay Thanks. I’ll do some tests
> On Mar 14, 2018, at 2:29 PM, Jeff Jirsa  wrote:
> 
> I'll confirm that it's worked for me in the past, but you should always test 
> changes like this in your lab/qa environment and not rely on some random 
> person on the internet.
> 
> 
> On Wed, Mar 14, 2018 at 7:13 AM, Cyril Scetbon  > wrote:
> And you confirm that if we use snitches like EC2Snitch or GPFS we’ll only 
> have to update the seed list in Cassandra.yaml if this node is a seed ? 
> 
> —
> Cyril Scetbon
> 
>> On Mar 13, 2018, at 10:08 PM, Jeff Jirsa > > wrote:
>> 
>> If you're just trying to change an IP, you can just stop the node, change 
>> the IP and restart the node and it'll be fine (change it everywhere).
>> 
>> Replacing a node is different: replacing is when a node dies, and you're 
>> replacing it with a new node that doesnt have any data. The 
>> -Dcassandra.replace_address option tells the starting instance it needs to 
>> look for a dead host and get all of the data that host should have had.
>> 
>> 
>> 
>> On Tue, Mar 13, 2018 at 6:57 PM, Cyril Scetbon > > wrote:
>> Hey,
>> 
>> I always thought that changing the IP address of a node requires to use the 
>> same procedure as for a died node, which part of it consists in starting 
>> Cassandra the -Dcassandra.replace_address option as indicated at 
>> https://docs.datastax.com/en/cassandra/3.0/cassandra/operations/opsReplaceNode.html
>>  
>> 
>>  
>> 
>> However, it’s said at 
>> https://docs.datastax.com/en/dse/5.1/dse-admin/datastax_enterprise/operations/opsChangeIp.html
>>  
>> 
>>  that we can simply start the new node after having done some changes in 
>> configuration files that could be impacted (seed list in cassandra.yaml, 
>> cassandra-topology.properties). Is it a feature of the DSE ? Is it something 
>> that works with the community version ? How does it work exactly ? Does the 
>> replacement happen because it has the same data as the replaced node and 
>> something like an id is found in the local files ? The token list ?
>> 
>> Thank you
>> —
>> Cyril Scetbon
>> 
>> 
> 
> 

Re: Changing a node IP address

[Jeff Jirsa]

I'll confirm that it's worked for me in the past, but you should always
test changes like this in your lab/qa environment and not rely on some
random person on the internet.


On Wed, Mar 14, 2018 at 7:13 AM, Cyril Scetbon 
wrote:

> And you confirm that if we use snitches like EC2Snitch or GPFS we’ll only
> have to update the seed list in Cassandra.yaml if this node is a seed ?
>
> —
> Cyril Scetbon
>
> On Mar 13, 2018, at 10:08 PM, Jeff Jirsa  wrote:
>
> If you're just trying to change an IP, you can just stop the node, change
> the IP and restart the node and it'll be fine (change it everywhere).
>
> Replacing a node is different: replacing is when a node dies, and you're
> replacing it with a new node that doesnt have any data. The
> -Dcassandra.replace_address option tells the starting instance it needs to
> look for a dead host and get all of the data that host should have had.
>
>
>
> On Tue, Mar 13, 2018 at 6:57 PM, Cyril Scetbon 
> wrote:
>
>> Hey,
>>
>> I always thought that changing the IP address of a node requires to use
>> the same procedure as for a died node, which part of it consists in
>> starting Cassandra the -Dcassandra.replace_address option as indicated at
>> https://docs.datastax.com/en/cassandra/3.0/cassandra/operati
>> ons/opsReplaceNode.html
>>
>> However, it’s said at https://docs.datastax.com/en/d
>> se/5.1/dse-admin/datastax_enterprise/operations/opsChangeIp.html that we
>> can simply start the new node after having done some changes in
>> configuration files that could be impacted (seed list in cassandra.yaml,
>> cassandra-topology.properties). Is it a feature of the DSE ? Is it
>> something that works with the community version ? How does it work exactly
>> ? Does the replacement happen because it has the same data as the replaced
>> node and something like an id is found in the local files ? The token list ?
>>
>> Thank you
>> —
>> Cyril Scetbon
>>
>>
>
>

Re: Changing a node IP address

[Cyril Scetbon]

And you confirm that if we use snitches like EC2Snitch or GPFS we’ll only have 
to update the seed list in Cassandra.yaml if this node is a seed ? 

—
Cyril Scetbon

> On Mar 13, 2018, at 10:08 PM, Jeff Jirsa  wrote:
> 
> If you're just trying to change an IP, you can just stop the node, change the 
> IP and restart the node and it'll be fine (change it everywhere).
> 
> Replacing a node is different: replacing is when a node dies, and you're 
> replacing it with a new node that doesnt have any data. The 
> -Dcassandra.replace_address option tells the starting instance it needs to 
> look for a dead host and get all of the data that host should have had.
> 
> 
> 
> On Tue, Mar 13, 2018 at 6:57 PM, Cyril Scetbon  > wrote:
> Hey,
> 
> I always thought that changing the IP address of a node requires to use the 
> same procedure as for a died node, which part of it consists in starting 
> Cassandra the -Dcassandra.replace_address option as indicated at 
> https://docs.datastax.com/en/cassandra/3.0/cassandra/operations/opsReplaceNode.html
>  
> 
>  
> 
> However, it’s said at 
> https://docs.datastax.com/en/dse/5.1/dse-admin/datastax_enterprise/operations/opsChangeIp.html
>  
> 
>  that we can simply start the new node after having done some changes in 
> configuration files that could be impacted (seed list in cassandra.yaml, 
> cassandra-topology.properties). Is it a feature of the DSE ? Is it something 
> that works with the community version ? How does it work exactly ? Does the 
> replacement happen because it has the same data as the replaced node and 
> something like an id is found in the local files ? The token list ?
> 
> Thank you
> —
> Cyril Scetbon
> 
> 

Re: Changing a node IP address

[Jeff Jirsa]

If you're just trying to change an IP, you can just stop the node, change
the IP and restart the node and it'll be fine (change it everywhere).

Replacing a node is different: replacing is when a node dies, and you're
replacing it with a new node that doesnt have any data. The
-Dcassandra.replace_address option tells the starting instance it needs to
look for a dead host and get all of the data that host should have had.



On Tue, Mar 13, 2018 at 6:57 PM, Cyril Scetbon 
wrote:

> Hey,
>
> I always thought that changing the IP address of a node requires to use
> the same procedure as for a died node, which part of it consists in
> starting Cassandra the -Dcassandra.replace_address option as indicated at
> https://docs.datastax.com/en/cassandra/3.0/cassandra/
> operations/opsReplaceNode.html
>
> However, it’s said at https://docs.datastax.com/en/
> dse/5.1/dse-admin/datastax_enterprise/operations/opsChangeIp.html that we
> can simply start the new node after having done some changes in
> configuration files that could be impacted (seed list in cassandra.yaml,
> cassandra-topology.properties). Is it a feature of the DSE ? Is it
> something that works with the community version ? How does it work exactly
> ? Does the replacement happen because it has the same data as the replaced
> node and something like an id is found in the local files ? The token list ?
>
> Thank you
> —
> Cyril Scetbon
>
>