JsonPath¶

一、笔记¶

# 无换行打印
kubectl get po -A \
    -o jsonpath='{.items[*].spec.containers[*].image}'

# go-template print
kubectl get po -A -o go-template \
    --template='{{range .items}}{{printf "%s\n" .metadata.name}}{{end}}'

# go-template print
kubectl get po -A -o go-template \
    --template='{{range .items}}{{printf "%s\n" .spec.containers[0].image}}{{end}}'

# jsonpath print
kubectl get po -A \
    -o=jsonpath='{range .items[*]}{.spec.containers[*].image}{"\n"}{end}'

# 转译
kubectl get secret tls-example.com \
    -o jsonpath='{.data.ca\.crt}'

二、常用技巧¶

Function	Description	Example	Result
`text`	the plain text	`kind is {.kind}`	`kind is List`
`@`	the current object	`{@}`	the same as input
`.` or `[]`	child operator	`{.kind}`, `{['kind']}` or `{['name\.type']}`	`List`
`..`	recursive descent	`{..name}`	`127.0.0.1 127.0.0.2 myself e2e`
`*`	wildcard. Get all objects	`{.items[*].metadata.name}`	`[127.0.0.1 127.0.0.2]`
`[start:end:step]`	subscript operator	`{.users[0].name}`	`myself`
`[,]`	union operator	`{.items[*]['metadata.name', 'status.capacity']}`	`127.0.0.1 127.0.0.2 map[cpu:4] map[cpu:8]`
`?()`	filter	`{.users[?(@.name=="e2e")].user.password}`	`secret`
`range`, `end`	iterate list	`{range .items[*]}[{.metadata.name}, {.status.capacity}] {end}`	`[127.0.0.1, map[cpu:4]] [127.0.0.2, map[cpu:8]]`
`''`	quote interpreted string	`{range .items[*]}{.metadata.name}{'\t'}{end}`	`127.0.0.1 127.0.0.2`