AWS CloudWatch Logs监控Apache日志文件

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AWS CloudWatch Logs?

AWS于2014年7月发布了CloudWatch Logs服务，在使用AWS服务时我们可使用CloudWatch Logs对中间件及应用程序生成的任何日志文件进行监控。利用指标设置警报，并组合SNS发送告警邮件。

在这里简单介绍以下如何使用CloudWatch Logs监控Apache的Error日志文件。

使用CloudWatch Logs监控Apache日志文件

具体的操作步骤如下；

创建EC2(AMI选择CentOS7)
添加IAM权限启动EC2
安装Apache并启动
安装CloudWatch Logs代理(Agent)
查看CloudWatch Logs搜集的日志内容
编辑事件保留时间
创建筛选条件
创建警报

使用CloudWatch Logs步骤

启动Amazon EC2

参照Amazon EC2分配IAM角色，启动Amazon EC2实例。

安全组需要允许22端口及80端口访问。

安装Apache

# yum -y update
# yum -y install httpd
# systemctl start httpd

安装CloudWatch Logs代理(Agent)

# yum -y install wget
# wget https://s3.amazonaws.com/aws-cloudwatch/downloads/latest/awslogs-agent-setup.py
# python ./awslogs-agent-setup.py --region ap-northeast-1
Launching interactive setup of CloudWatch Logs agent ...

Step 1 of 5: Installing pip ...DONE

Step 2 of 5: Downloading the latest CloudWatch Logs agent bits ... DONE

Step 3 of 5: Configuring AWS CLI ...
AWS Access Key ID [None]:
AWS Secret Access Key [None]:
Default region name [ap-northeast-1]:
Default output format [None]:

Step 4 of 5: Configuring the CloudWatch Logs Agent ...
Path of log file to upload [/var/log/messages]: /var/log/httpd/error_log
Destination Log Group name [/var/log/httpd/error_log]:

Choose Log Stream name:
  1. Use EC2 instance id.
  2. Use hostname.
  3. Custom.
Enter choice [1]:

Choose Log Event timestamp format:
  1. %b %d %H:%M:%S    (Dec 31 23:59:59)
  2. %d/%b/%Y:%H:%M:%S (10/Oct/2000:13:55:36)
  3. %Y-%m-%d %H:%M:%S (2008-09-08 11:52:54)
  4. Custom
Enter choice [1]:

Choose initial position of upload:
  1. From start of file.
  2. From end of file.
Enter choice [1]:
More log files to configure? [Y]: N

Step 5 of 5: Setting up agent as a daemon ...DONE


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- Configuration file successfully saved at: /var/awslogs/etc/awslogs.conf
- You can begin accessing new log events after a few moments at https://console.aws.amazon.com/cloudwatch/home?region=ap-northeast-1#logs:
- You can use 'sudo service awslogs start|stop|status|restart' to control the daemon.
- To see diagnostic information for the CloudWatch Logs Agent, see /var/log/awslogs.log
- You can rerun interactive setup using 'sudo python ./awslogs-agent-setup.py --region ap-northeast-1 --only-generate-config'
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