I dont have much code to show.
I want to process all cloudwatch logs that are generated in last 1 day using lambda.
I want to execute lambda 6 am in the morning to extract some information from cloudwatch logs that are generated on previous day and put it in a table.
Instead of your 6 AM idea, you could also use a CloudWatch Logs subscription filter and trigger a Lambda function to process and store the log entries as described in a step-by-step example here Example 2: Subscription filters with AWS Lambda.
Or even easier and without duplicating the data to a database: Analyzing log data with CloudWatch Logs Insights
I assume that you have a lot of Lambda functions and each has a CloudWatch Log Group.
You can try the CloudWatch Log Group subscription filter, with this feature you can stream your logs into any support destinations such as Lambda.
Before that, you should prepare a Lambda function that has functionalities to help you to put your extracted data into DynamoDB table.
References:
https://docs.aws.amazon.com/lambda/latest/dg/with-ddb-example.html
https://www.geeksforgeeks.org/aws-dynamodb-insert-data-using-aws-lambda/
Related
I have several lambda functions deployed on AWS that I want to monitor directly for errors to update a postgresql table with.
I have created a lambda to parse streamed log data and update the db. I want to set up subscription filters between this lambda and my other function logs.
There are 6 log streams I want to monitor and the AWS Console limits the subscription filters to 2 per log group.
Is there a workaround or a better way to implement this kind of monitoring?
Thanks
how can i display only the person name in cloudwatch dashbaord.
log : message:"Personname ABC",
able to filter the message using the query..filter #message like /Personname / |
display message
please help to display only the name i dont like to display'Personname' just the name ABC.
CloudWatch Metric filters are not used to extract text, they're used for counting the number of occurrences for a specific condition i.e. when the Persons name is ABC
After the CloudWatch Logs agent begins publishing log data to Amazon CloudWatch, you can begin searching and filtering the log data by creating one or more metric filters. Metric filters define the terms and patterns to look for in log data as it is sent to CloudWatch Logs. CloudWatch Logs uses these metric filters to turn log data into numerical CloudWatch metrics that you can graph or set an alarm on. You can use any type of CloudWatch statistic, including percentile statistics, when viewing these metrics or setting alarms.
If you're wanting to analyze your data take a look at using CloudWatch Logs Insights.
As #ChrisWilliams explained, the metric filters serve different purpose.
One way of filtering the logs is through log subscriptions:
You can use subscriptions to get access to a real-time feed of log events from CloudWatch Logs and have it delivered to other services such as a Amazon Kinesis stream, Amazon Kinesis Data Firehose stream, or AWS Lambda for custom processing, analysis, or loading to other systems.
Using subscriptions you could feed your logs into Kiensis Firehose in real-time, transform it using firehose transforamtions into format you desire and save it to S3. This way you can process the logs in a way you want and have them delivered to S3 for further analysis or long term storage.
Alternatively, can feed the logs directly to a lambda function, and from there you can do what you wish.
There is a group of AWS CloudWatch Logs, inside which there are several threads. As far as I understand it, each thread is a log coming from a separate server or container.
CloudWatch Log streams
I put the whole group of logs in Kinesis Firehose to deliver them to S3 Bucket. But inside Kinesis Firehose, all the logs are merged into one. How can I get these logs to the S3 storage so that each thread has its own directory?
I found a solution:
1) I modified every log in Kinesis Firehose using the Lambda function. I added an identifier to the end of the log line. And then it looks like this:
Modified logs
2) I created a Lambda function with a trigger that works every time logs are written to s3 bucket. And in this function, I distribute logs to the folders I need based on the information I added to the logs earlier. I will not give the code of this lambda function. I've described the general approach and I think those who need it can figure it out.
is there a way of saving logs generated by a crawler in a specific, newly created cloudwatch log group?
I want to use the finish crawling log as a trigger to a lambda function.
Many thanks in advance!
You can use the AWS CloudWatch Logs API to upload logs. Use CreateLogGroup and CreateLogStream to create your log stream, and then use PutLogEvents to upload your log.
There are other options that might be more suitable for triggering a Lambda function though, depending on your exact use case, such as uploading the collected log to S3 and having the upload trigger the function, or even starting the Lambda function directly.
The AWS documentation indicates that multiple log event records are provided to Lambda when streaming logs from CloudWatch.
logEvents
The actual log data, represented as an array of log event
records. The "id" property is a unique identifier for every log event.
How does CloudWatch group these logs?
Time? Count? Randomly, from my perspective?
Currently you get one Lambda invocation for every PutLogEvents batch that CloudWatch Logs had received against that log group. However you should probably not rely on that because AWS could always change it (for example batch more, etc).
You can observe this behavior by running the CWL -> Lambda example in the AWS docs.
Some aws services allow you to configure the log intervals such as elastic load balancing. There's a choice between five and sixty minute log intervals. You may not see a specific increment or parameter in the docs because they are configurable based on each service.