From 72eb0f30a3dc067969ea478340f0a57e391a064c Mon Sep 17 00:00:00 2001
From: coesensbert <coesensb@incubaid.com>
Date: Wed, 19 Jun 2024 14:55:41 +0200
Subject: [PATCH] scripts for loki clients

---
 loki-docker-logs.sh | 22 +++++++++++++++
 loki-system-logs.sh | 68 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 90 insertions(+)
 create mode 100644 loki-docker-logs.sh
 create mode 100644 loki-system-logs.sh

diff --git a/loki-docker-logs.sh b/loki-docker-logs.sh
new file mode 100644
index 0000000..dcb2fbf
--- /dev/null
+++ b/loki-docker-logs.sh
@@ -0,0 +1,22 @@
+#!/bin/sh -e
+# This script will setup docker to push all newly created container logs to https://int.loki.grid.tf
+# NOTE: existing containers will need to be recreated to send their logs to Loki
+
+### Install docker plugin
+docker plugin install grafana/loki-docker-driver:2.9.2 --alias loki --grant-all-permissions
+
+### Edit docker daemon config file
+cat << EOF > /etc/docker/daemon.json
+{
+    "debug" : true,
+    "log-driver": "loki",
+    "log-opts": {
+        "loki-url": "https://int.loki.grid.tf/loki/api/v1/push",
+        "loki-batch-size": "400"
+    }
+}
+EOF
+
+### Restart docker
+systemctl restart docker
+echo "Don't forget to recreate all containers that should send their logs to Loki! This config does not apply to existing containers"
diff --git a/loki-system-logs.sh b/loki-system-logs.sh
new file mode 100644
index 0000000..dde90b0
--- /dev/null
+++ b/loki-system-logs.sh
@@ -0,0 +1,68 @@
+#/bin/bash
+# This script will setup Promtail to push to https://int.loki.grid.tf
+
+### Install Promtail
+mkdir -p /etc/apt/keyrings/
+wget -q -O - https://apt.grafana.com/gpg.key | gpg --dearmor > /etc/apt/keyrings/grafana.gpg
+echo "deb [signed-by=/etc/apt/keyrings/grafana.gpg] https://apt.grafana.com stable main" | tee /etc/apt/sources.list.d/grafana.list
+apt update && apt install promtail -y
+usermod -a -G adm promtail
+
+### Set config
+cat << EOF > /etc/promtail/config.yml
+server:
+  http_listen_port: 9080
+  grpc_listen_port: 0
+
+positions:
+  filename: /tmp/positions.yaml
+
+clients:
+- url: https://int.loki.grid.tf/loki/api/v1/push
+
+scrape_configs:
+- job_name: system
+  static_configs:
+  - targets:
+      - localhost
+    labels:
+      host: ${HOSTNAME}
+      job: varlogs
+      __path__: /var/log/*log
+- job_name: journal
+  journal:
+    json: false
+    max_age: 24h
+    path: /var/log/journal
+    labels:
+      host: ${HOSTNAME}
+      job: systemd-journal
+  relabel_configs:
+    - source_labels: ['__journal__systemd_unit']
+      target_label: 'unit'
+EOF
+
+### Edit service
+cat << EOF > /etc/systemd/system/promtail.service
+[Unit]
+Description=Promtail service
+After=network.target
+
+[Service]
+Type=simple
+User=promtail
+Environment="HOSTNAME=%H"
+ExecStart=/usr/bin/promtail -config.file /etc/promtail/config.yml -config.expand-env=true
+# Give a reasonable amount of time for promtail to start up/shut down
+TimeoutSec = 60
+Restart = on-failure
+RestartSec = 2
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+### Reload and restart
+systemctl daemon-reload
+systemctl restart promtail
+systemctl status promtail