Upload system and application logs into AWS CloudWatch

上傳系統或應用程式日誌到AWS CloudWatch!

使用場景

上傳EC2 instance的系統日誌及是應用程式因誌到CloudWatch，再利用CloudWatch Logs Insights去分析日誌，進而建立Alarms. (不需再另外建立Logs system去收集及分析)。

## Instance package
$ yum update -y
$ yum install -y awslogs
$ vi /etc/awslogs/awscli.conf
$ cat /etc/awslogs/awscli.conf
[plugins]
cwlogs = cwlogs
[default]
region = us-west-2

## Enable and start awslogs anget
$ service awslogs start
$ chkconfig awslogs on
$ tail -f /var/log/awslogs.log

Reference

Quick Start: Install and Configure the CloudWatch Logs Agent on a Running EC2 Linux Instance — https://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/QuickStartEC2Instance.html

Analyzing Log Data with CloudWatch Logs Insights — https://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/AnalyzingLogData.html