Обсуждение: pg_upgrade question
Hello all, We're running a 13.x installation and looking to upgrade to 14.1. This is all on Linux servers. We have a main instance running with a number of hot standby replicas configured. In the past, we have done a dump/restore on a slow evening and then rsynced all the bits around so that the main server and all replicas were identical at the start. The database has gotten larger now (~1TB) so that is a less desirable option. So I am thinking to do a pg_upgrade --link on each of the main and the hot standby replicas, and then restarting all the processes. I'm sure this will work fine on the main server, but I have not seen any mention of this working in the expected way on the hot standby replicas. Can someone confirm that the steps I described here will work in the way I am optimistically expecting it will? I should mention that we are running on ZFS, and will take a snapshot prior to the upgrade, so that if something goes sideways with our use of --link we can revert back instantly. Thank you, Alan
On 12/2/21 08:05, Alan Stange wrote: > Hello all, > > We're running a 13.x installation and looking to upgrade to 14.1. This > is all on Linux servers. We have a main instance running with a number > of hot standby replicas configured. In the past, we have done a > dump/restore on a slow evening and then rsynced all the bits around so > that the main server and all replicas were identical at the start. The > database has gotten larger now (~1TB) so that is a less desirable option. > > So I am thinking to do a pg_upgrade --link on each of the main and the > hot standby replicas, and then restarting all the processes. I'm sure > this will work fine on the main server, but I have not seen any mention > of this working in the expected way on the hot standby replicas. Can > someone confirm that the steps I described here will work in the way I > am optimistically expecting it will? Have you looked at steps 9 & 11 here?: https://www.postgresql.org/docs/current/pgupgrade.html > > I should mention that we are running on ZFS, and will take a snapshot > prior to the upgrade, so that if something goes sideways with our use of > --link we can revert back instantly. > > Thank you, > > Alan > > -- Adrian Klaver adrian.klaver@aklaver.com
Of course that would be in the manual ;-) Thank you for pointing this out. We've been doing upgrades the reliable old school way for so long that I wasn't aware that something better was already well documented. Thank you, Alan On 12/2/21 11:10, Adrian Klaver wrote: > On 12/2/21 08:05, Alan Stange wrote: >> Hello all, >> >> We're running a 13.x installation and looking to upgrade to 14.1. This >> is all on Linux servers. We have a main instance running with a number >> of hot standby replicas configured. In the past, we have done a >> dump/restore on a slow evening and then rsynced all the bits around so >> that the main server and all replicas were identical at the start. The >> database has gotten larger now (~1TB) so that is a less desirable option. >> >> So I am thinking to do a pg_upgrade --link on each of the main and the >> hot standby replicas, and then restarting all the processes. I'm sure >> this will work fine on the main server, but I have not seen any mention >> of this working in the expected way on the hot standby replicas. Can >> someone confirm that the steps I described here will work in the way I >> am optimistically expecting it will? > Have you looked at steps 9 & 11 here?: > > https://www.postgresql.org/docs/current/pgupgrade.html > >> I should mention that we are running on ZFS, and will take a snapshot >> prior to the upgrade, so that if something goes sideways with our use of >> --link we can revert back instantly. >> >> Thank you, >> >> Alan >> >> >