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I want to know few details about streaming replication.

I want to setup streaming replication between version 9.4.4 and 9.4.20 ?

I have the master server in centos6.6 with postgres version 9.4.4 which is a physical machine and we have created a new virtual machine centos7.5 and postgres version is 9.4.20. I want to know if this will cause any problem due to version mismatch.

Also, How can I download specific minor version 9.4.4 of postgres ? I checked some official documentation and by yum I am able to see only 9.4 which is actually 9.4.20 after I installed.

  • Why not upgrade the master from 9.4.4 to 9.4.20 first? And then setup replication? – ypercubeᵀᴹ Dec 18 '18 at 16:58
  • Well, we can't do the upgrade as of now. Other option comes out to be installing 9.4.4. version in slave server. Can you suggest/help with that ? Also, if we somehow managed to accept the app team for upgrade to 9.4.20, how we can do that? I checked regarding "pg_upgrade" but it is used for major releases not minor releases. Thanks for your help – KSingh Dec 18 '18 at 17:14
  • The minor upgrade is usually much easier. Stop the database, replace binaries, restart (and even better take a backup first, just in case). – ypercubeᵀᴹ Dec 18 '18 at 17:24
  • Thanks, Any suggestion on how to get 9.4.4 rpm of postgres ? – KSingh Dec 18 '18 at 18:42
  • Sorry, I don't know. I mainly work with Debian/Ubuntu. – ypercubeᵀᴹ Dec 19 '18 at 20:47
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AFAIK it will work and documentation says, it should work.

In general, log shipping between servers running different major PostgreSQL release levels is not possible. It is the policy of the PostgreSQL Global Development Group not to make changes to disk formats during minor release upgrades, so it is likely that running different minor release levels on primary and standby servers will work successfully. However, no formal support for that is offered and you are advised to keep primary and standby servers at the same release level as much as possible. When updating to a new minor release, the safest policy is to update the standby servers first — a new minor release is more likely to be able to read WAL files from a previous minor release than vice versa.

https://www.postgresql.org/docs/9.4/warm-standby.html

For upgrade process

If you installed PostgreSQL via yum, yum update postgresql* should work. If you need rpms here is the PostgreSQL download link;

http://download.postgresql.org/pub/repos/yum/9.4/redhat/

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