Upgrade redis opensource 5 to 7

[huynv9699]

I wanna upgrade redis from 5 to 7.
I think i will install newest redis version on other port and use the same datafile. could it be ok?
How can i do it ? is there any best practices to do this ?
thanks.

[sundb]

first make sure you have a backup of your data file first, and then use it directly in the new version, which will automatically upgrade the old rdb to new version.

[Atom1010]

@sundb How to make the upgrade in zero downtime in production env?

[sundb]

are you using standard or cluster? I'm not expert on this, so I can only offer some advice.
if is standard:

1. create a high version replication of the current master.
2 waiting for the replication to sync to complete.
3 using `failover` command to switch master to the new replication.
4. directing your services to the new master.

but in any case, it will be unavailable for a short time in the middle of 3) 4).
btw, it would be smoother in cluster mode or sentinel mode.