Kubernetes JSONPath

2021-06-06 162 words One minute

Contents

What is JSONPath?

JSONPath

JSONPath is for selecting data of the JSON.
JSONPath You can test JSONPath Online Evaluator

JSONPath	Description
`$`	The root object/element
`@`	The current object/element
`.` or `[]`	Child operator
`..`	Recursive descent.
`*`	Wildcard. All objects/elements regardless their names.
`[]`	Subscript operator. XPath uses it to iterate over element collections and for predicates. In Javascript and JSON it is the native array operator.
`[,]`	Union operator in XPath results in a combination of node sets. JSONPath allows alternate names or array indices as a set.
`[start:end:step]`	Array slice operator
`?()`	Applies a filter (script) expression.
`()`	Script expression, using the underlying script engine.

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kubectl get nodes -o json > /opt/outputs/nodes.json

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kubectl get nodes node01 -o json > /opt/outputs/node01.json

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kubectl get nodes -o=jsonpath='{$.items[*].metadata.name}'

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kubectl get nodes -o=jsonpath='{$.items[*].status.nodeInfo.osImage}'

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kubectl config view --kubeconfig=/root/my-kube-config -o=jsonpath='{$.users[*].name}'

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kubectl get pv --sort-by='{.spec.capacity.storage}'

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kubectl get pv --sort-by=.spec.capacity.storage -o=custom-columns=NAME:.metadata.name,CAPACITY:.spec.capacity.storage

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kubectl config view --kubeconfig=my-kube-config -o jsonpath="{.contexts[?(@.context.user=='aws-user')].name}"