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obagent

OBAgent 通常部署在 OBServer 节点上。OBAgent支持推、拉两种数据采集模式，可以满足不同的应用场景。
OBAgent默认支持的插件包括主机数据采集、OceanBase 数据库指标的采集、监控数据标签处理和 Prometheus 协议的 HTTP 服务。

1）编辑 OBAgent 部署配置文件obagent-only.yaml

OBAgent 部署配置文件可以跟 OceanBase 集群部署配置文件部署在一起，也可以后期单独部署，此处为单独部署。

vim obagent-only.yaml
obagent:servers:- name: obce01ip: 192.168.152.30- name: obce02ip: 192.168.152.31- name: obce03ip: 192.168.152.32global:home_path: /home/admin/obagentserver_port: 8088pprof_port: 8089sql_port: 3881rpc_port: 3882log_level: INFOlog_path: log/monagent.logcrypto_method: plainlog_size: 30log_expire_day: 7log_file_count: 10http_basic_auth_user: adminhttp_basic_auth_password: eIYf7NAZeTpprof_basic_auth_user: adminpprof_basic_auth_password: eIYf7NAZeTmonitor_user: monitormonitor_password: fLyaqjrp2Rcluster_name: obcluster-3zonesobce01: zone: zone1 obce02: zone: zone2 obce03: zone: zone3

注意：
1.指定节点的连接端口用的是 sql_port ，跟 OBServer 配置文件里的 mysql_port对应。
2. 监控用户（monitor_user 对应）和密码需要在 sys 租户下创建。

创建monitor用户并授权

obclient -h 192.168.152.30 -uroot@sys#obcluster-3zones -P3883 -p0EI5N08d -c -A oceanbase执行如下操作：
SHOW GRANTS FOR monitor;
grant select on oceanbase.* to monitor identified by 'fLyaqjrp2R'; #和配置文件里密码一致然后再次查看monitor用户权限，结果如下：
MySQL [oceanbase]> SHOW GRANTS FOR monitor;
+--------------------------------------------+
| Grants for monitor@%                       |
+--------------------------------------------+
| GRANT USAGE ON *.* TO 'monitor'            |
| GRANT SELECT ON `oceanbase`.* TO 'monitor' |
+--------------------------------------------+
2 rows in set (0.190 sec)

2）使用obd部署obagent

wget https://mirrors.aliyun.com/oceanbase/community/stable/el/8/x86_64/obagent-1.2.0-4.el8.x86_64.rpm
su - admin
obd mirror clone /tmp/obsoft/obagent-1.2.0-4.el8.x86_64.rpm
obd cluster deploy obagent-only -c obagent-only.yaml
obd cluster start obagent-only

部署完成，查看和验证obagent

[admin@obce01 ~]$ obd cluster list
+--------------------------------------------------------------------------------+
|                                  Cluster List                                  |
+------------------+-------------------------------------------+-----------------+
| Name             | Configuration Path                        | Status (Cached) |
+------------------+-------------------------------------------+-----------------+
| obce-single      | /home/admin/.obd/cluster/obce-single      | destroyed       |
| obcluster-3zones | /home/admin/.obd/cluster/obcluster-3zones | running         |
| obagent-only     | /home/admin/.obd/cluster/obagent-only     | running         |
+------------------+-------------------------------------------+-----------------+
[admin@obce01 ~]$ obd cluster display obagent-only
Get local repositories and plugins ok
Open ssh connection ok
Cluster status check ok
+----------------------------------------------------+
|                      obagent                       |
+----------------+-------------+------------+--------+
| ip             | server_port | pprof_port | status |
+----------------+-------------+------------+--------+
| 192.168.152.30 | 8088        | 8089       | active |
| 192.168.152.31 | 8088        | 8089       | active |
| 192.168.152.32 | 8088        | 8089       | active |
+----------------+-------------+------------+--------+使用curl测试agent ：密码在配置文件中提前配置了
curl --user admin:eIYf7NAZeT -L 'http://192.168.152.31:8088/metrics/ob/basic'

3）obagnet重启

i.直接重启某个节点的 OBAgent：kill -9 `pidof monagent`cd /home/admin/obagent && nohup bin/monagent -c conf/monagent.yaml &ii.如果是集中重启，使用 OBD 命令重启：obd cluster restart obagent_onlyiii.如果 OBAgent 是跟 OceanBase 一起部署的，则只能重启 obagent 组件：obd cluster restart obce-3zones-obagent -c obagent

4）部署prometheus

OBAgent 启动后会自动生成 Prometheus 配置文件，被放在 OBAgent
安装目录下（/home/admin/obagent/conf/prometheus_config/）。可供 Prometheus直接使用。

scrape_interval 1s 抓取间隔
evaluation_interval 10s 评估规则间隔
rule_files rules/*rules.yaml 报警规则
scrape_configs – 抓取配置

prometheus下载：https://prometheus.io/download/

解压安装并启动

tar zxvf prometheus-xxxxxxxx.linux-amd64.tar.gz 
cp /home/admin/obagent/conf/prometheus_config/promethous.yaml /home/admin/prometheus-2.37.5.linux-amd64/
./prometheus  ---config.file=prometheus.yaml &netstat -nltp 可以看到9090端口开着
浏览器直接访问192.168.152.30:9090/graph

5）grafana安装

下载安装：

wget https://dl.grafana.com/enterprise/release/grafana-enterprise-9.3.6-1.x86_64.rpm
sudo yum install grafana-enterprise-9.3.6-1.x86_64.rpm   

使用：

sudo systemctl start grafana-server.service
http://192.168.152.30:3000/login  admin/admin