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Posted to user@cassandra.apache.org by Cyril Scetbon <cy...@free.fr> on 2018/03/14 01:57:42 UTC
Changing a node IP address
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
Posted by Cyril Scetbon <cy...@free.fr>.
Okay Thanks. I’ll do some tests
> On Mar 14, 2018, at 2:29 PM, Jeff Jirsa <jj...@gmail.com> 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 <cyril.scetbon@free.fr <ma...@free.fr>> 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 <jjirsa@gmail.com <ma...@gmail.com>> 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 <cyril.scetbon@free.fr <ma...@free.fr>> 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 <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 <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
Posted by Jeff Jirsa <jj...@gmail.com>.
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 <cy...@free.fr>
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 <jj...@gmail.com> 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 <cy...@free.fr>
> 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
Posted by Cyril Scetbon <cy...@free.fr>.
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 <jj...@gmail.com> 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 <cyril.scetbon@free.fr <ma...@free.fr>> 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 <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 <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
Posted by Jeff Jirsa <jj...@gmail.com>.
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 <cy...@free.fr>
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
>
>