infra/modules/loki/default.nix

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{
config,
lib,
pkgs,
flake,
...
}:
{
# Only expose loki port via wireguard interface
networking.firewall.interfaces.wg-ssh.allowedTCPPorts = [ 3100 ];
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# source: https://gist.github.com/rickhull/895b0cb38fdd537c1078a858cf15d63e
# https://grafana.com/docs/loki/latest/configure/examples/#1-local-configuration-exampleyaml
services.loki = {
enable = true;
configuration = {
server.http_listen_port = 3100;
auth_enabled = false;
common = {
ring = {
instance_interface_names = [ "wg-ssh" ];
instance_enable_ipv6 = true;
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kvstore = {
store = "inmemory";
};
};
replication_factor = 1;
path_prefix = "/var/lib/loki";
storage = {
filesystem = {
chunks_directory = "chunks/";
rules_directory = "rules/";
};
};
};
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ingester = {
chunk_encoding = "snappy";
chunk_idle_period = "1h";
};
query_range = {
results_cache = {
cache = {
embedded_cache = {
enabled = true;
max_size_mb = 500;
};
};
};
};
chunk_store_config = {
chunk_cache_config = {
embedded_cache = {
enabled = true;
max_size_mb = 500;
ttl = "24h";
};
};
};
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# Keep logs for 4 weeks
# https://grafana.com/docs/loki/latest/operations/storage/retention/
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limits_config = {
retention_period = "4w";
split_queries_by_interval = "0";
};
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compactor = {
compaction_interval = "10m";
delete_request_store = "filesystem";
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retention_enabled = true;
retention_delete_delay = "2h";
retention_delete_worker_count = 150;
};
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schema_config = {
configs = [
{
from = "2020-05-15";
store = "boltdb-shipper";
object_store = "filesystem";
schema = "v11";
index = {
prefix = "index_";
period = "24h";
};
}
{
from = "2024-05-31";
store = "tsdb";
object_store = "filesystem";
schema = "v13";
index = {
prefix = "index_";
period = "24h";
};
}
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];
};
};
};
services.promtail = {
enable = true;
configuration = {
server = {
http_listen_port = 9080;
grpc_listen_port = 0;
};
positions = {
filename = "/tmp/positions.yaml";
};
clients = [
{
url = "http://flora-6.wg.pub.solar:${toString config.services.loki.configuration.server.http_listen_port}/loki/api/v1/push";
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}
];
scrape_configs = [
{
job_name = "journal";
journal = {
max_age = "24h";
labels = {
job = "systemd-journal";
host = "flora-6";
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};
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};
relabel_configs = [
{
source_labels = [ "__journal__systemd_unit" ];
target_label = "unit";
}
];
}
];
};
};
}