83 lines
2.5 KiB
Nix
83 lines
2.5 KiB
Nix
{ pkgs, ... }:
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{
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services.postgresql.ensureUsers = [ { name = "telegraf"; } ];
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systemd.services.postgresql.postStart = ''
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$PSQL -tAc 'GRANT pg_read_all_stats TO telegraf' -d postgres
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'';
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services.telegraf.extraConfig.inputs.postgresql = {
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address = "host=/run/postgresql user=telegraf database=postgres";
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};
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services.postgresql = {
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enable = true;
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# enableJIT seems to be broken, can't set a version without also needing to add withJIT
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package = pkgs.postgresql_15.withJIT;
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enableJIT = true;
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# From https://pgconfigurator.cybertec.at/
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settings = {
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# Connectivity
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max_connections = 500;
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superuser_reserved_connections = 3;
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# Memory Settings
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shared_buffers = "8 GB";
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work_mem = "32 MB";
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maintenance_work_mem = "420 MB";
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huge_pages = "off";
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effective_cache_size = "22 GB";
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effective_io_concurrency = 100; # concurrent IO only really activated if OS supports posix_fadvise function
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random_page_cost = 1.25; # speed of random disk access relative to sequential access (1.0)
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# Monitoring
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shared_preload_libraries = "pg_stat_statements"; # per statement resource usage stats
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track_io_timing = "on"; # measure exact block IO times
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track_functions = "pl"; # track execution times of pl-language procedures if any
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# Replication
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wal_level = "replica"; # consider using at least "replica"
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max_wal_senders = 0;
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synchronous_commit = "on";
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# Checkpointing:
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checkpoint_timeout = "15 min";
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checkpoint_completion_target = 0.9;
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# 2x default, hint from service logs
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max_wal_size = "2 GB";
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min_wal_size = "1 GB";
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# WAL writing
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wal_compression = "on";
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wal_buffers = -1; # auto-tuned by Postgres till maximum of segment size (16MB by default)
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wal_writer_delay = "200ms";
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wal_writer_flush_after = "1MB";
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# Background writer
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bgwriter_delay = "200ms";
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bgwriter_lru_maxpages = 100;
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bgwriter_lru_multiplier = 2.0;
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bgwriter_flush_after = 0;
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# Parallel queries:
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max_worker_processes = 8;
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max_parallel_workers_per_gather = 4;
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max_parallel_maintenance_workers = 4;
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max_parallel_workers = 8;
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parallel_leader_participation = "on";
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# Advanced features
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enable_partitionwise_join = "on";
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enable_partitionwise_aggregate = "on";
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jit = "on";
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max_slot_wal_keep_size = "1000 MB";
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track_wal_io_timing = "on";
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maintenance_io_concurrency = 100;
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wal_recycle = "on";
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};
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};
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}
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