VM Instance to Google Cloud SQL Migration

Am 15.11.2018 um 08:54 schrieb Sathish Kumar:

We would like to migrate our Postgresql VM instance on Google Cloud
Platform to Google Cloud SQL with a minimal downtime. As I checked, we
have to export and import the SQL file and our database size is large
and cannot afford longer downtime.

Do any have solution to achieve this?.

setup a replication from one to the other?

Regards, Andreas

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2ndQuadrant - The PostgreSQL Support Company.
www.2ndQuadrant.com

2018年11月15日(木) 17:19 Andreas Kretschmer <andreas@a-kretschmer.de>:

Am 15.11.2018 um 08:54 schrieb Sathish Kumar:

We would like to migrate our Postgresql VM instance on Google Cloud
Platform to Google Cloud SQL with a minimal downtime. As I checked, we
have to export and import the SQL file and our database size is large
and cannot afford longer downtime.

Do any have solution to achieve this?.

setup a replication from one to the other?

Doesn't seem possible at the moment; here:
https://cloud.google.com/sql/docs/postgres/replication/
it says: "Cloud SQL for PostgreSQL does not yet support replication
from an external
master or external replicas for Cloud SQL instances."

Looking at the feature list:

https://cloud.google.com/sql/docs/postgres/features

among the "Unsupported features" are: "Any features that require
SUPERUSER privileges"
(apart from a limited number of extensions), which pretty much rules
out pglogical or similar solutions.

Regards

Ian Barwick

--
2ndQuadrant - The PostgreSQL Support Company.
www.2ndQuadrant.com

On Thu, 15 Nov 2018 at 07:06, Ian Lawrence Barwick <barwick@gmail.com> wrote:

2018年11月15日(木) 17:19 Andreas Kretschmer <andreas@a-kretschmer.de>:

Am 15.11.2018 um 08:54 schrieb Sathish Kumar:

We would like to migrate our Postgresql VM instance on Google Cloud
Platform to Google Cloud SQL with a minimal downtime. As I checked, we
have to export and import the SQL file and our database size is large
and cannot afford longer downtime.

Do any have solution to achieve this?.

setup a replication from one to the other?

Doesn't seem possible at the moment; here:
https://cloud.google.com/sql/docs/postgres/replication/
it says: "Cloud SQL for PostgreSQL does not yet support replication
from an external
master or external replicas for Cloud SQL instances."

Looking at the feature list:

https://cloud.google.com/sql/docs/postgres/features

among the "Unsupported features" are: "Any features that require
SUPERUSER privileges"
(apart from a limited number of extensions), which pretty much rules
out pglogical or similar solutions.

That usually also rules out Slony-I, although there's a possibility...

Slony-I includes a feature called log shipping, which could perhaps be used
for this, assuming that the "source" environment does allow superuser
privileges. (And I think you're running on a PostgreSQL instance where
that's possible...)

See: http://slony.info/documentation/logshipping.html

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When confronted by a difficult problem, solve it by reducing it to the
question, "How would the Lone Ranger handle this?"