profiles/monitoring: move loki to a profile

Add a nginx virtualhost for loki too, so that we can use a valid SSL
certificate.

1 files changed, 103 insertions, 0 deletions

diff --git a/profiles/monitoring/loki.nix b/profiles/monitoring/loki.nix
new file mode 100644
index 0000000..1200846
--- /dev/null
+++ b/profiles/monitoring/loki.nix
@@ -0,0 +1,103 @@
+{ config, lib, pkgs, ... }:
+{
+  services.loki.enable = true;
+  services.loki.configuration = {
+    # no need for authentication, since we're binding on the
+    # wireguard interface, we can trust the connections.
+    auth_enabled = false;
+
+    server = {
+      http_listen_port = 3100;
+      http_listen_address = "127.0.0.1";
+    };
+
+    ingester = {
+      lifecycler = {
+        address = cfg.listenAddress;
+        ring = {
+          kvstore = { store = "inmemory"; };
+          replication_factor = 1;
+        };
+        final_sleep = "0s";
+      };
+
+      # Any chunk not receiving new logs in this time will be flushed
+      chunk_idle_period = "1h";
+
+      # All chunks will be flushed when they hit this age, default is 1h
+      max_chunk_age = "1h";
+
+      # Loki will attempt to build chunks up to 1.5MB, flushing first if
+      # chunk_idle_period or max_chunk_age is reached first
+      chunk_target_size = 1048576;
+
+      # Must be greater than index read cache TTL if using an index cache (Default
+      # index read cache TTL is 5m)
+      chunk_retain_period = "30s";
+
+      # Chunk transfers disabled
+      max_transfer_retries = 0;
+    };
+
+    schema_config = {
+      configs = [{
+        from = "2020-10-24";
+        store = "boltdb-shipper";
+        object_store = "filesystem";
+        schema = "v11";
+        index = {
+          prefix = "index_";
+          period = "24h";
+        };
+      }];
+    };
+
+    storage_config = {
+      boltdb_shipper = {
+        active_index_directory = "/var/lib/loki/boltdb-shipper-active";
+        cache_location = "/var/lib/loki/boltdb-shipper-cache";
+
+        # Can be increased for faster performance over longer query periods,
+        # uses more disk space
+        cache_ttl = "24h";
+
+        shared_store = "filesystem";
+      };
+
+      filesystem = { directory = "/var/lib/loki/chunks"; };
+    };
+
+    limits_config = {
+      reject_old_samples = true;
+      reject_old_samples_max_age = "168h";
+    };
+
+    chunk_store_config = { max_look_back_period = "0s"; };
+
+    table_manager = {
+      retention_deletes_enabled = false;
+      retention_period = "0s";
+    };
+
+    compactor = {
+      working_directory = "/var/lib/loki/boltdb-shipper-compactor";
+      shared_store = "filesystem";
+    };
+  };
+
+  services.nginx.virtualHosts."loki.${config.homelab.domain}" = {
+    default = true;
+    forceSSL = true;
+    enableACME = true;
+    listen = [
+      {
+        addr = "192.168.6.40";
+        port = 443;
+        ssl = true;
+      }
+    ];
+    locations."/" = {
+      proxyPass = "http://127.0.0.1::${toString services.loki.configuration.server.http_listen_port}";
+    };
+  };
+}