101 lines
2.7 KiB
Nix
101 lines
2.7 KiB
Nix
{
|
|
config,
|
|
pkgs,
|
|
...
|
|
}:
|
|
{
|
|
sops.secrets = {
|
|
"postgres/replication_password" = {
|
|
owner = "root";
|
|
group = "root";
|
|
};
|
|
};
|
|
|
|
virtualisation.docker.enable = true;
|
|
|
|
systemd.services.postgresql-replica = {
|
|
description = "PostgreSQL WAL streaming replica (Docker)";
|
|
requires = [
|
|
"docker.service"
|
|
"network-online.target"
|
|
];
|
|
after = [
|
|
"docker.service"
|
|
"network-online.target"
|
|
];
|
|
wantedBy = [ "multi-user.target" ];
|
|
|
|
serviceConfig = {
|
|
Type = "simple";
|
|
Restart = "on-failure";
|
|
RestartSec = "10s";
|
|
TimeoutStartSec = "0";
|
|
};
|
|
|
|
preStart = ''
|
|
DATADIR="/storage/backup/postgresql-replica"
|
|
PG_PASS=$(cat ${config.sops.secrets."postgres/replication_password".path})
|
|
${pkgs.docker}/bin/docker pull postgres:17
|
|
if [ ! -f "$DATADIR/PG_VERSION" ]; then
|
|
echo "No data dir found — running pg_basebackup..."
|
|
rm -rf "$DATADIR"
|
|
${pkgs.docker}/bin/docker run --rm \
|
|
-e PGPASSWORD="$PG_PASS" \
|
|
-v "/storage/backup:/out" \
|
|
--network host \
|
|
postgres:17 \
|
|
pg_basebackup \
|
|
--host=10.10.0.1 \
|
|
--port=5432 \
|
|
--username=replicator \
|
|
--pgdata=/out/postgresql-replica \
|
|
--wal-method=stream \
|
|
--checkpoint=fast \
|
|
--progress \
|
|
--verbose
|
|
touch "$DATADIR/standby.signal"
|
|
cat > "$DATADIR/postgresql.auto.conf" <<EOF
|
|
primary_conninfo = 'host=10.10.0.1 port=5432 user=replicator password=$PG_PASS application_name=cyper-controller sslmode=disable'
|
|
EOF
|
|
cat > "$DATADIR/postgresql.conf" <<EOF
|
|
hot_standby = on
|
|
hot_standby_feedback = on
|
|
wal_receiver_timeout = '60s'
|
|
port = 5434
|
|
listen_addresses = '*'
|
|
EOF
|
|
chown -R 999:999 "$DATADIR"
|
|
fi
|
|
if [ ! -f "$DATADIR/postgresql.conf" ]; then
|
|
cat > "$DATADIR/postgresql.conf" <<EOF
|
|
hot_standby = on
|
|
hot_standby_feedback = on
|
|
wal_receiver_timeout = '60s'
|
|
port = 5434
|
|
listen_addresses = '*'
|
|
EOF
|
|
chown 999:999 "$DATADIR/postgresql.conf"
|
|
fi
|
|
'';
|
|
|
|
script = ''
|
|
${pkgs.docker}/bin/docker run --rm \
|
|
--name postgresql-replica \
|
|
-v /storage/backup/postgresql-replica:/var/lib/postgresql/data \
|
|
--network host \
|
|
postgres:17
|
|
'';
|
|
|
|
postStop = ''
|
|
${pkgs.docker}/bin/docker rm -f postgresql-replica 2>/dev/null || true
|
|
'';
|
|
};
|
|
|
|
services.prometheus.exporters.postgres = {
|
|
enable = true;
|
|
port = 9188;
|
|
runAsLocalSuperUser = false;
|
|
dataSourceName = "postgresql://postgres@localhost:5434/postgres?sslmode=disable";
|
|
};
|
|
}
|