Lycolog

• 確認環境
• Apache2
• PostgreSQL
• Redis
• Mastodonの組み込みExporter

確認環境

Apache2

# 取得
wget https://github.com/Lusitaniae/apache_exporter/releases/download/v1.0.12/apache_exporter-1.0.12.linux-amd64.tar.gz
tar xvfz apache_exporter-1.0.12.linux-amd64.tar.gz

# binを配置
sudo cp apache_exporter-1.0.12.linux-amd64/apache_exporter /usr/local/bin/
ls -la /usr/local/bin/ | grep apache_exporter

# デーモン作成
cat <<'EOF' | sudo tee /etc/systemd/system/apache_exporter.service
[Unit]
Description=Prometheus Apache Exporter
After=network.target

[Service]
Type=simple
User=prometheus
Group=prometheus
WorkingDirectory=/var/lib/prometheus
ExecStart=/usr/local/bin/apache_exporter --scrape_uri=http://[::]:ここにポート番号/server-status?auto
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF

# デーモンの有効化
sudo systemctl daemon-reload
sudo systemctl enable --now apache_exporter

# 起動確認
curl "http://[::1]:9117/metrics"

# 掃除
rm -Rf apache_exporter-1.0.12.linux-amd64 apache_exporter-1.0.12.linux-amd64.tar.gz

PostgreSQL

# 取得
wget https://github.com/prometheus-community/postgres_exporter/releases/download/v0.19.1/postgres_exporter-0.19.1.linux-amd64.tar.gz
tar xvfz postgres_exporter-0.19.1.linux-amd64.tar.gz

# binを配置
sudo cp postgres_exporter-0.19.1.linux-amd64/postgres_exporter /usr/local/bin/
ls -la /usr/local/bin/ | grep postgres_exporter

# 監視ユーザーの作成
sudo -u postgres psql
CREATE USER postgres_exporter WITH PASSWORD 'ここにパスワード';
ALTER USER postgres_exporter SET SEARCH_PATH TO postgres_exporter,pg_catalog;
GRANT pg_monitor TO postgres_exporter;
quit

# 監視情報の作成
echo 'DATA_SOURCE_NAME="postgresql://postgres_exporter:ここにパスワード@localhost:5432/postgres?sslmode=disable"' | sudo tee /etc/default/postgres_exporter
sudo chown root:root /etc/default/postgres_exporter
sudo chmod 600 /etc/default/postgres_exporter

# デーモン作成
cat <<'EOF' | sudo tee /etc/systemd/system/postgres_exporter.service
[Unit]
Description=Prometheus PostgreSQL Exporter
After=network.target postgresql.service
Wants=postgresql.service

[Service]
Type=simple
User=prometheus
Group=prometheus
WorkingDirectory=/var/lib/prometheus
EnvironmentFile=/etc/default/postgres_exporter
ExecStart=/usr/local/bin/postgres_exporter \
    --web.listen-address=[::]:9187
Restart=on-failure
RestartSec=5
EOF

# デーモンの有効化
sudo systemctl daemon-reload
sudo systemctl enable --now postgres_exporter

# 起動確認
curl "http://[::1]:9187/metrics"

# 掃除
rm -Rf postgres_exporter-0.19.1.linux-amd64 postgres_exporter-0.19.1.linux-amd64.tar.gz

Redis

# 取得
wget https://github.com/oliver006/redis_exporter/releases/download/v1.82.0/redis_exporter-v1.82.0.linux-amd64.tar.gz
tar xvfz redis_exporter-v1.82.0.linux-amd64.tar.gz

# binを配置
sudo cp redis_exporter-v1.82.0.linux-amd64/redis_exporter /usr/local/bin/
ls -la /usr/local/bin/ | grep redis_exporter

# デーモン作成
cat <<'EOF' | sudo tee /etc/systemd/system/redis_exporter.service
[Unit]
Description=Prometheus Redis Exporter
After=network.target

[Service]
Type=simple
User=prometheus
Group=prometheus
WorkingDirectory=/var/lib/prometheus
ExecStart=/usr/local/bin/redis_exporter --redis.addr=redis://localhost:6379
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF

# デーモンの有効化
sudo systemctl daemon-reload
sudo systemctl enable --now redis_exporter

# 起動確認
curl "http://[::1]:9121/metrics"

# 掃除
rm -Rf redis_exporter-v1.82.0.linux-amd64 redis_exporter-v1.82.0.linux-amd64.tar.gz

Mastodonの組み込みExporter

1. .env.productionに以下を追加

   MASTODON_PROMETHEUS_EXPORTER_ENABLED=true
   MASTODON_PROMETHEUS_EXPORTER_SIDEKIQ_DETAILED_METRICS=true
   

2. デーモンを作る

   cat <<'EOF' | sudo tee /etc/systemd/system/mastodon-prometheus-exporter.service
   [Unit]
   Description=mastodon-prometheus-exporter
   After=network.target
   
   [Service]
   Type=simple
   User=mastodon
   WorkingDirectory=/home/mastodon/live
   Environment="RAILS_ENV=production"
   ExecStart=/home/mastodon/.rbenv/shims/bundle exec prometheus_exporter -b "::" -p 9394
   Restart=always
   
   [Install]
   WantedBy=multi-user.target
   EOF
   
   # デーモンの有効化
   sudo systemctl daemon-reload
   sudo systemctl enable --now mastodon-prometheus-exporter
   

3. 起動確認

   curl "http://[::1]:9394/metrics"
   # Streamingはv4でしかlistenしてないので[::1]は諦める
   curl "http://localhost:5001/metrics"