memcached_exporter

Memcached Exporter 快速入门

Prometheus exporter for Memcached server metrics.

https://github.com/prometheus/memcached_exporter

memcached_exporter 从 memcached 服务器导出指标供 Prometheus 使用。服务器被指定--memcached.address 为程序的标志（默认为localhost:11211）。

一、部署 memcached_exporter

下载 memcached_exporter

https://github.com/prometheus/memcached_exporter/releases

解压并安装：

cd /usr/local/src && tar -zxvf memcached_exporter-0.11.2.linux-amd64.tar.gz;
mv memcached_exporter-0.11.2.linux-amd64 /usr/local/memcached_exporter;
cd /usr/local/memcached_exporter;

查看使用帮助:

[root@192 memcached_exporter]# ./memcached_exporter -h
usage: memcached_exporter [<flags>]

Flags:
  -h, --[no-]help                Show context-sensitive help (also try --help-long and --help-man).
      --memcached.address="localhost:11211"
                                 Memcached server address.
      --memcached.timeout=1s     memcached connect timeout.
      --memcached.pid-file=""    Optional path to a file containing the memcached PID for additional metrics.
      --[no-]memcached.tls.enable
                                 Enable TLS connections to memcached
      --memcached.tls.cert-file=""
                                 Client certificate file.
      --memcached.tls.key-file=""
                                 Client private key file.
      --memcached.tls.ca-file=""
                                 Client root CA file.
      --[no-]memcached.tls.insecure-skip-verify
                                 Skip server certificate verification
      --memcached.tls.server-name=""
                                 Memcached TLS certificate servername
      --[no-]web.systemd-socket  Use systemd socket activation listeners instead of port listeners (Linux only).
      --web.listen-address=:9150 ...
                                 Addresses on which to expose metrics and web interface. Repeatable for multiple addresses.
      --web.config.file=""       [EXPERIMENTAL] Path to configuration file that can enable TLS or authentication.
      --web.telemetry-path="/metrics"
                                 Path under which to expose metrics.
      --log.level=info           Only log messages with the given severity or above. One of: [debug, info, warn, error]
      --log.format=logfmt        Output format of log messages. One of: [logfmt, json]
      --[no-]version             Show application version.

默认情况下，memcache_exporter 在以下端口提供 0.0.0.0:9150 服务/metrics：

./memcached_exporter

或者提供一个 Dockerfile：

docker run -p 9150:9150 quay.io/prometheus/memcached-exporter:latest

访问监控度量信息地址：

http://localhost:9150/metrics

使用 systemd方式启动

# cat >/usr/lib/systemd/system/memcached_exporter.service <<EOF

[Unit]
Description=Prometheus exporter for Memcached server metrics.
Documentation=https://github.com/prometheus/memcached_exporter
After=network.target

[Service]
ExecStart=/usr/local/memcached_exporter/memcached_exporter --memcached.address=localhost:11211 --web.listen-address=:9150
ExecReload=/bin/kill -s HUP $MAINPID
ExecStop=/bin/kill -s QUIT $MAINPID
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF

# systemctl enable memcached_exporter
# systemctl restart memcached_exporter
# systemctl status memcached_exporter

设置随机启动：

[root@local ~]# systemctl daemon-reload
[root@local ~]# systemctl disable memcached_exporter.service
[root@local ~]# systemctl enable memcached_exporter.service
[root@local ~]# systemctl start memcached_exporter.service
[root@local ~]# systemctl status memcached_exporter.service
[root@local ~]# systemctl stop memcached_exporter.service
[root@local ~]# systemctl restart memcached_exporter.service

二、在 prometheus.yaml 中添加 memcached_exporter 的配置

在 Prometheus 配置文件里，您可以按如下方式设置抓取配置

    - job_name: memcached # To get metrics about the memcached exporter’s targets
      # metrics_path defaults to '/metrics'
      # scheme defaults to 'http'.
      static_configs:
        - targets: ["localhost:9150"]