Installing Loki on CentOS / Debian

Loki is a repository for logs (prometheus like), i.e. a set of components for a complete system for working with logs.

Add a system user from which Loki will work

$ sudo useradd -r -M -s /bin/false loki

Downloading Loki

$ cd /usr/local/bin
$ sudo curl -O -L "https://github.com/grafana/loki/releases/download/v2.0.0/loki-linux-amd64.zip"

Unpack

Распаковываем
$ sudo unzip loki-linux-amd64.zip

Delete the archive

$ sudo rm loki-linux-amd64.zip

Affairs file executable

$ sudo chmod a+x "loki-linux-amd64"

Change owner

$ sudo chown loki:loki loki-linux-amd64

We create a configuration file, or download a ready

$ wget https://raw.githubusercontent.com/grafana/loki/master/cmd/loki/loki-local-config.yaml

$ sudo nano config-loki.yml
auth_enabled: false

server:
  http_listen_port: 3100

ingester:
  lifecycler:
    address: 127.0.0.1
    ring:
      kvstore:
        store: inmemory
      replication_factor: 1
    final_sleep: 0s
  chunk_idle_period: 5m
  chunk_retain_period: 30s
  max_transfer_retries: 0

schema_config:
  configs:
    - from: 2018-04-15
      store: boltdb
      object_store: filesystem
      schema: v11
      index:
        prefix: index_
        period: 168h

storage_config:
  boltdb:
    directory: /tmp/loki/index

  filesystem:
    directory: /tmp/loki/chunks

limits_config:
  enforce_metric_name: false
  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

In address: 127.0.0.1 – listen to localhost In address: 0.0.0.0 we specify to listen to all available interfaces.

Change the owner of the config

$ sudo chown loki:loki config-loki.yml

Create Systemd Unit

$ sudo nano /etc/systemd/system/loki.service
[Unit]
Description=Loki service
After=network.target

[Service]
Type=simple
User=loki
ExecStart=/usr/local/bin/loki-linux-amd64 -config.file /usr/local/bin/config-loki.yml

[Install]
WantedBy=multi-user.target

Add the service to startup and start

$ sudo systemctl daemon-reload
$ sudo systemctl enable --now loki
$ systemctl status loki

We look at the service logs

$ sudo tail -f /var/log/messages | grep loki

Checking port 3100 to see if Loki has started

$ ss -nltup | grep 3100

We configure the Firewall, open the port to the outside, if necessary

$ sudo firewall-cmd --add-port=3100/tcp  --permanent
$ sudo firewall-cmd --reload

http://[Your-Server-Domain-or-IP]:3100/metrics

Next, it remains to connect Loki to the Grafana visualization system, and install on the servers from which we want to shoot logs, the agent – Promtail

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