Amazon services json query how to#
Amazon services json query update#
Amazon services json query software#

A slice-expression uses a start and end index along with an optional stepping number (the default step value is 1). Index enumeration, ie Images, returns the result at the specified position within a list. There are a number of “bracket-specifier” expressions that allow you to access an array of results. Advanced JMESPath QueriesĪs powerful as the simple JMESPath queries are, there is a lot more expression left in the specification! If you recall earlier, the MultiSelect List can take an optional expression within the bracket. This concludes a quick overview of JMESPath queries for AWS CLI. $ aws ec2 describe-images -image-ids ami-013aca6a Just to confirm out suspicions, try querying the tomcat7java6 Elastic Beanstalk AMI. You can use the AWS API and botocore API references to figure out what is available and then chop away to what your script may need. Note that botocore is returning a Pythonic CamelCase form of what the EC2 DescribeImages API XML response returns. Each key in the response structure can be evaluated with the SubExpression to get its value. AWS CLI uses botocore and in the botocore documentation the response syntax is given for a botocore ec2 describe_images function call. You may be asking yourself, “Hey Joe just evaluated two expressions, ImageId and Name, but how did he know which to work with?” Sometimes you have to RTFM. So, ignoring the error, our first five results have some elasticbeanstalk AMIs which isn’t too surprising considering that AWS Elastic Beanstalk is one of the original offerings by AWS.

$ aws ec2 describe-images -owner amazon -query 'Images.' -output text | grep -m5 'ami-'Īmi-0048c968. In a moment, when we are trying to select JSON within the results, we will use the default -output json. The default output is json so we switch to -output text which allows IMAGES results to return all on one line. Below we attempt to see how many AMIs are actually offered by AWS themselves.

If you just run a simple query to see what AMIs Amazon owns you will be quickly overwhelmed. Let’s take a look at how the AWS CLI, and a few pipe commands, can filter out the extra info so you find the latest and greatest AMI.

Amazon services json query update#

Furthermore, the image id changes every time an update is rolled out leaving you with an outdated and perhaps soon to be deleted AMI. The most painful part of using these images is their IDs are very unfriendly for people to remember.

Amazon services json query software#

Nearly everyone using AWS at one time or another has had to find an Amazon Machine Image (AMI) ID and code it into their software or launch an instance using it.

Amazon services json query how to#

For this article specifically, we are going to focus on the techniques highlighted in the section How to Filter the Output with the -query Option. If you haven’t explored it prior, take a moment to familiarize yourself with the methods by which you can Control Command Output from the AWS Command Line Interface. Using query expressions operations allows operators to skip some, if not all, of the painful exercises of extracting and manipulating the JSON with custom software. This post will focus on the -query command which allows you to filter your command results based on JMESPath query expressions. The Amazon Command Line Interface (AWS CLI) is a great tool for exploring and querying your Amazon Web Services (AWS) infrastructure and AWS provides the AWS Command Line Interface Documentation to give you a good idea of how to use the tool but some of the nuances of the advanced options are left up to the user to discover.

Category: Uncategorized JMESPath Query in the AWS CLIĪt OSC we empower the world’s best search teams – if you have a search engine project using Apache Solr or Elasticsearch and you’d like our help tuning relevance or performance, get in touch! Here’s a great blog from 2015 about AWS CLI tricks and tips.