From a7c8b86b1f6fbc094ee0a6db1a606ec1aae8b496 Mon Sep 17 00:00:00 2001
From: Sam <samual.shop@proton.me>
Date: Sat, 6 Jul 2024 20:53:26 +0100
Subject: [PATCH] Postgres docker configuration

---
 hosts/common/optional/docker/postgres.nix | 116 ++++++++++++++--------
 1 file changed, 75 insertions(+), 41 deletions(-)

diff --git a/hosts/common/optional/docker/postgres.nix b/hosts/common/optional/docker/postgres.nix
index c5d7c3e..f698c4d 100644
--- a/hosts/common/optional/docker/postgres.nix
+++ b/hosts/common/optional/docker/postgres.nix
@@ -1,6 +1,72 @@
 { pkgs, lib, inputs, config, ... }:
 let
   admin_dbPasswordFile = lib.optionalString (lib.hasAttr "sops-nix" inputs) config.sops.secrets."software/postgres/admin_db/password".path;
+  initScript = pkgs.writeText "init.sh" ''
+    #!/bin/bash
+    function create_user_and_database() {
+      local database=$1
+      local user=$2
+      local extensions=$3
+      echo "### admin user: $POSTGRES_USER ###"
+      echo "  Creating database '$database'"
+      echo "  Creating user  '$user'"
+      psql -v --username "$POSTGRES_USER" -d "$POSTGRES_DB" <<-EOSQL
+          CREATE USER $user;
+          CREATE DATABASE $database;
+          GRANT ALL PRIVILEGES ON DATABASE $database TO $user;
+    EOSQL
+            
+    # Loop through extensions and create them
+    for ext in $(echo "$extensions" | tr ',' ' '); do
+      echo "     - Installing extention $ext"
+      psql -v --username "$POSTGRES_USER" -d "$database" -c "CREATE EXTENSION $ext;"
+    done
+    }
+            
+    if [ -n "$POSTGRES_MULTIPLE_DATABASES" ]; then
+            
+      # Parse the JSON string
+      database_names=$(echo "$POSTGRES_MULTIPLE_DATABASES" | jq -r '.[0] | keys[]')
+      echo "Multiple database creation requested: $(echo "$database_names" | tr "\n" " ")"
+              
+      # Loop through each database and create it
+      for db_name in $database_names; do
+        user=$(echo "$POSTGRES_MULTIPLE_DATABASES" | jq -r ".[0] | .''${db_name} | .user")
+        extensions=$(echo "$POSTGRES_MULTIPLE_DATABASES" | jq -r ".[0] | .''${db_name} | .extensions | join(\",\")")
+        create_user_and_database "$db_name" "$user" "$extensions"
+      done
+    fi
+  '';
+
+  pg_hbaConfig = pkgs.writeText "pg_hba.conf" ''
+    none
+  '';
+
+  pgsqlConfig = pkgs.writeText "postgresql.conf" ''
+    listen_addresses = '*'
+    port = 5432
+    max_connections = 100
+    shared_buffers = 24GB
+    work_mem = 1GB
+    maintenance_work_mem = 10GB
+    autovacuum_work_mem = 2GB
+    dynamic_shared_memory_type = posix
+    wal_level = minimal
+    checkpoint_timeout = 60min
+    checkpoint_completion_target = 0.9
+    max_wal_size = 10GB
+    min_wal_size = 80MB
+    max_wal_senders = 0
+    random_page_cost = 1.0
+    effective_cache_size = 25GB
+    jit = off
+    log_line_prefix = '%m [%p] %q%u@%d '
+    log_timezone = 'Etc/UTC'
+    cluster_name = 'postgres-docker'
+    datestyle = 'iso, dmy'
+    timezone = 'Etc/UTC'
+    default_text_search_config = 'pg_catalog.english'
+  '';
 in
 {
   sops.secrets = {
@@ -12,7 +78,7 @@ in
       "db".settings.services."db".service = {
         restart = "unless-stopped";
         build.context = "/nix/store";
-        build.dockerfile = builtins.baseNameOf "${pkgs.writeScript "pgDockerfile" ''
+        build.dockerfile = builtins.baseNameOf "${pkgs.writeText "pgDockerfile" ''
             FROM postgres:16
             # install packages
             RUN apt-get update \
@@ -21,6 +87,7 @@ in
                     jq \
                 && rm -rf /var/lib/apt/lists/*
           ''}";
+        command = [ "postgres" "-c" "config_file=/etc/postgresql/postgresql.conf" ];
         environment = {
           POSTGRES_PASSWORD_FILE = admin_dbPasswordFile;
           POSTGRES_USER = "admin";
@@ -48,59 +115,26 @@ in
                   "user": "dbt",
                   "extensions": []
                 }
-                "test": {
-                  "user": "test",
-                  "extensions": [hstore]
-                }
               }
             ]
           '';
         };
         ports = [ "5432:5432" ];
         volumes = [
+
+          # Mount pgdata to external zfs volume
           "/mnt/postgres:/var/lib/postgresql/data"
 
+          # Mount config files
+          #          "${pg_hbaConfig}:/var/lib/postgres/data/pgdata/pg_hba.conf"
+          "${pgsqlConfig}:/etc/postgresql/postgresql.conf"
+
           # Need to mount secret file 
           "${admin_dbPasswordFile}:${admin_dbPasswordFile}"
 
           # PG init script to parse json specified in POSTGRES_MULTIPLE_DATABASES
           # creates databases, users and installs extensions for each database.
-          "${pkgs.writeScript "init.sh" ''
-            #!/bin/bash
-            function create_user_and_database() {
-              local database=$1
-              local user=$2
-              local extensions=$3
-              echo "### admin user: $POSTGRES_USER ###"
-              echo "  Creating database '$database'"
-              echo "  Creating user  '$user'"
-              psql -v --username "$POSTGRES_USER" -d "$POSTGRES_DB" <<-EOSQL
-                  CREATE USER $user;
-                  CREATE DATABASE $database;
-                  GRANT ALL PRIVILEGES ON DATABASE $database TO $user;
-            EOSQL
-            
-            # Loop through extensions and create them
-            for ext in $(echo "$extensions" | tr ',' ' '); do
-              echo "     - Installing extention $ext"
-              psql -v --username "$POSTGRES_USER" -d "$database" -c "CREATE EXTENSION $ext;"
-            done
-            }
-            
-            if [ -n "$POSTGRES_MULTIPLE_DATABASES" ]; then
-            
-              # Parse the JSON string
-              database_names=$(echo "$POSTGRES_MULTIPLE_DATABASES" | jq -r '.[0] | keys[]')
-              echo "Multiple database creation requested: $(echo "$database_names" | tr "\n" " ")"
-              
-              # Loop through each database and create it
-              for db_name in $database_names; do
-                user=$(echo "$POSTGRES_MULTIPLE_DATABASES" | jq -r ".[0] | .''${db_name} | .user")
-                extensions=$(echo "$POSTGRES_MULTIPLE_DATABASES" | jq -r ".[0] | .''${db_name} | .extensions | join(\",\")")
-                create_user_and_database "$db_name" "$user" "$extensions"
-              done
-            fi
-           ''}:/docker-entrypoint-initdb.d/init.sh"
+          "${initScript}:/docker-entrypoint-initdb.d/init.sh"
         ];
       };
     };