使用 TimescaleDB + Promscale 存储 Prometheus 时序指标数据
您可以通过 Promscale,使用TimescaleDB持久化Prometheus指标数据。
虽然这并不是推荐的行为,但这是了解Pigsty部署系统使用方式的好机会。
注意,使用 Promscale 存储 Prometheus 指标占用的存储空间大约是 Prometheus 的 4 倍,但是可以使用 SQL 来查询分析 Prometheus 监控指标。
准备Postgres数据库
vi pigsty.yml # 取消注释DB/User定义:dbuser_prometheus prometheus
pg_databases: # define business users/roles on this cluster, array of user definition
- { name: prometheus, owner: dbuser_prometheus , revokeconn: true, comment: prometheus primary database }
pg_users: # define business users/roles on this cluster, array of user definition
- {name: dbuser_prometheus , password: DBUser.Prometheus ,pgbouncer: true , createrole: true, roles: [dbrole_admin], comment: admin user for prometheus database }
创建 Prometheus 业务数据库与业务用户。
bin/createuser pg-meta dbuser_prometheus
bin/createdb pg-meta prometheus
检查数据库可用性并创建扩展
psql postgres://dbuser_prometheus:[email protected]:5432/prometheus -c 'CREATE EXTENSION timescaledb;'
配置Promscale
在元节点上执行以下命令安装 promscale
yum install -y promscale
如果默认软件包中没有,可以直接下载:
wget https://github.com/timescale/promscale/releases/download/0.6.1/promscale_0.6.1_Linux_x86_64.rpm
sudo rpm -ivh promscale_0.6.1_Linux_x86_64.rpm
编辑 promscale
的配置文件 /etc/sysconfig/promscale.conf
PROMSCALE_DB_HOST="127.0.0.1"
PROMSCALE_DB_NAME="prometheus"
PROMSCALE_DB_PASSWORD="DBUser.Prometheus"
PROMSCALE_DB_PORT="5432"
PROMSCALE_DB_SSL_MODE="disable"
PROMSCALE_DB_USER="dbuser_prometheus"
最后启动promscale,它会访问安装有 timescaledb
的数据库实例,并创建所需的schema
# launch
cat /usr/lib/systemd/system/promscale.service
systemctl start promscale && systemctl status promscale
配置Prometheus
Prometheus可以使用Remote Write/ Remote Read的方式,通过Promscale,使用Postgres作为远程存储。
编辑Prometheus配置文件:
vi /etc/prometheus/prometheus.yml
添加以下记录:
remote_write:
- url: "http://127.0.0.1:9201/write"
remote_read:
- url: "http://127.0.0.1:9201/read"
重启Prometheus后,监控数据即可放入Postgres中。
systemctl restart prometheus
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