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fix: raise default max_replication_slots from 5 to 10 in the postgres AMI #2387

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fix: raise default max_replication_slots from 5 to 10 in the postgres AMI #2387

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90b584f
fix: raise default max_replication_slots from 5 to 10
hunleyd Aug 21, 2026
14533ce
fix: update README's advertised max_replication_slots value to 10
hunleyd Aug 21, 2026
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2 changes: 1 addition & 1 deletion README.md
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Expand Up @@ -215,7 +215,7 @@ This is the same PostgreSQL build that powers [Supabase](https://supabase.io), b
- ✅ Postgres [postgresql-17.6](https://www.postgresql.org/docs/17/index.html)
- ✅ Postgres [orioledb-postgresql-17_11](https://github.com/orioledb/orioledb)
- ✅ Ubuntu 24.04 (Noble Numbat).
- ✅ [wal_level](https://www.postgresql.org/docs/current/runtime-config-wal.html) = logical and [max_replication_slots](https://www.postgresql.org/docs/current/runtime-config-replication.html) = 5. Ready for replication.
- ✅ [wal_level](https://www.postgresql.org/docs/current/runtime-config-wal.html) = logical and [max_replication_slots](https://www.postgresql.org/docs/current/runtime-config-replication.html) = 10. Ready for replication.
- ✅ [Large Systems Extensions](https://github.com/aws/aws-graviton-getting-started#building-for-graviton-and-graviton2). Enabled for ARM images.
## Extensions

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2 changes: 1 addition & 1 deletion ansible/files/postgresql_config/postgresql.conf.j2
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Expand Up @@ -296,7 +296,7 @@ checkpoint_flush_after = 256kB # measured in pages, 0 disables

max_wal_senders = 10 # max number of walsender processes
# (change requires restart)
max_replication_slots = 5 # max number of replication slots
max_replication_slots = 10 # max number of replication slots
# (change requires restart)
#wal_keep_size = 0 # in megabytes; 0 disables
max_slot_wal_keep_size = 512 # in megabytes; -1 disables
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2 changes: 1 addition & 1 deletion nix/tools/update_readme.nu
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Expand Up @@ -229,7 +229,7 @@ def update_readme [] {
let features_content = [
($pg_versions | each {|version| create_version_link $version} | str join "\n")
"- ✅ Ubuntu 24.04 (Noble Numbat)."
"- ✅ [wal_level](https://www.postgresql.org/docs/current/runtime-config-wal.html) = logical and [max_replication_slots](https://www.postgresql.org/docs/current/runtime-config-replication.html) = 5. Ready for replication."
"- ✅ [wal_level](https://www.postgresql.org/docs/current/runtime-config-wal.html) = logical and [max_replication_slots](https://www.postgresql.org/docs/current/runtime-config-replication.html) = 10. Ready for replication."
"- ✅ [Large Systems Extensions](https://github.com/aws/aws-graviton-getting-started#building-for-graviton-and-graviton2). Enabled for ARM images."
]

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