쿠버네티스 secret 파일 저장하기
쿠버네티스의 Secret 은 암호화해서 데이터를 저장하는데, 파일도 저장할 수 있다. 바이너리 파일이던 텍스트 파일이던 모두 base64 인코딩 스트링으로 저장이된다. 이것을 파일로 저장하는 방법에 대해서 간단하게 알아본다.
Prometheus 설정 Secret
Pormetheus 를 오퍼레이터(Operator) 로 설치를 했을 경우에 다음과 같은 Secret 을 볼 수 있다.
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$ kubectl get secret prometheus-prometheus-kube-prometheus-prometheus -n monitoring -o yaml apiVersion: v1 data: prometheus.yaml.gz: H4sIAAAAAAAA/+ydz4+jNhTH7/krfNjDzFYZdraXijmttJV66G5X7bGqLMe8JN4Y27JNOqOq/3uFYxJIIBtmWCZp3g0wfjz/4H2+NmAWUs+YTCeEwJrJgnmhFRXKg10zmZIf37kJIY5bZuDgMDx6sIpJKtkMpCuNEGKszsEvoXApybUSXluhFsnu8HRVzGBa299t7hmgFowUnKXkzc2X3z7Szx8+/Xw7sYUEOhcSXDqZkgQ8rxlPylSXtFo/cuFpmS3YnL5L3t49sVxOYqG5VnOxCNf6qmdUsRxS4sCuBYdPm/Ilp5WTSbA+Z4otwCbvJoQstdK2qjwyZ9LBhJAym1XgwVGX7S5PyJRYLSEloDKjhfKb6iodcoZxiPUfj1Q701ojTAjJwVvBHTXML1OSxN0JIRaCH83rOV1YDo3mDbUQtjyzC/CbxJRQ6nNDa21XVVYwxHjZr1KyAjAhc6tlSnPwjNYrYFPPm/MoM+a0M40FB8pvM1hYwGNKbvZbxHnGV412uX3wthjSZwsSWGjXHn7XM1W+79we3EcHck5jN+nn6EHOytvSwwH8rLo6Ndr6qjttr7L03kz/hll3Xz1ikWWZBedo7MYrobLembYOOTDMMq9tSh7qHn7WGTzc3L29jQeNZBxyUD4lb/65/7flPlI6g/Mtzxed9SuO0Vmf0myDWVvN1NJONlj12m3JmjZjch+LRmdd1noWtrTEtfJMKLBdNrcnDFjqKoK3NeB079yqqxxmOOXuq/oX7STGkrllSMx1VshSNNyH3SpilOn58XptmIkd9c3NH798+P3jbcNWjD4b6NF94pE//xqA8UaU+UYFfAZzVkgfdNoSStfLpikze+mi/c3ZQjnghQXqVsLQNVgxf9r5RcjG9Vj+nZshjbMgulKSrJlNbKESB9yCd8nuxDuhk1htjHNdKJ9wdsdt6dsMmAVLvV6BepalkPNClArXudEK4m1zMk6b2SqWbvvU4OA3Vq9FBj2h38hVl1abTKNg350vI5H5yPxLY/4AQa7rcpvwcPdDd//pJzmO3vlXpze4tpApN6LaCB64J+chvzaqf6f5h9iGVzL1cMKQfjcrdaZIRMQj4q8C8V/17NdyY1TCn3L/Xx3oF5bNmWL43OB53K4nCk2Fcp4p3pON37Azwkz9oQfbWPCCUuxD+CZ2NpzAR9Ij6S+O9DiB/wLOhv2yzayWEux0/Of1zQH286b0Y9zGWftzGN93dCkc7+N4H1UAqgAc7+N4v0OHgOcZTu1fOvrLVkTYI+wR9gh7hD3CvgP2xurHJ6T9pdM+NCPiHnGPuEfcI+4R9x24d3wJWSHx0QIqjhcqjm1PQtWBqgNVB6oOVB2oOtpVhwTfIjdiREa18T9SG2O8Jhh71OCyY/WT6y+Y6pmGd/CELxJRdKDoQNFxFqKjHgtG+y7xxPt/+xp9q/Kon4DqpUW93L+Oemn//iHhLFsLF9a+QX2D+gb1Deob1Deob1DfoL55pr55f1b6xlg9A4fqBtUNqpvXVgOoblDdoLpBdXOJ6kYbCCFgvIdPjdUrXrou5k6+7K02zsF6FxUI3V2SHlshNMuFc0IrylmMj7VFN0+ow8tRMb0lywH+D994qWoB33XBlTBRsaBiec3FM/D9kva/aeAiVefDy++4GNV5EhN/bYFwR7gj3HFlrCH47jzzUM2NvNLo/ULovTffjktMfvPpQ7N3jcLU8+UP8hR5emk8HTrAjDXbf9Vcr22WEWQKj2W0fL1fUtYn5y+H9i8bq3e1wZWM0fELzvMrD/Iaed0aQvALzoFIHf4zLFR45hy2D85qBNWQlFndIMfhz7ErY3FV4WgkvKJgLMzFY0qSzY3f5OwRqndxvY3se2w/oDshzAi6ButCodbvY2kOCt7Kk1ainHhjtNTZ0V9yD+BDB9cOZ3X/CwAA///mZWEHdn0AAA== kind: Secret metadata: annotations: generated: "true" creationTimestamp: "2022-01-29T16:06:35Z" labels: managed-by: prometheus-operator name: prometheus-prometheus-kube-prometheus-prometheus namespace: monitoring ownerReferences: - apiVersion: monitoring.coreos.com/v1 blockOwnerDeletion: true controller: true kind: Prometheus name: prometheus-kube-prometheus-prometheus uid: 6b8415cb-b99a-4ac4-8bc1-a6175265fd1c resourceVersion: "841303" uid: 18933ea2-4dd8-464c-a61b-69513f7a807c type: Opaque |
data 필드를 보면 prometheus.yaml.gz 파일이름이 보이고 내용이 base64 스트링이 보인다. 이 prometheus.yaml.gz 파일을 받기 위해서는 간단히 bas64 스트링을 디코딩하고 나오는 스트링을 그냥 파일명으로 저장하면 된다.
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$ echo "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" | base64 -d > prometheus.yaml.gz $ file prometheus.yaml.gz prometheus.yaml.gz: gzip compressed data, original size modulo 2^32 32118 |
간단하게 echo “<encoded-value>” | base64 -d prometheus.yaml.gz 으로 보면 된다.
압축을 해제하고 파일을 수정한 후에 다시 압축을 한다. 그리고 이것을 base64 로 인코딩 스트링을 만들면 되는데 다음과 같이 만들 수 있다.
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$ cat prometheus.yaml.gz | base64 -w 0 |
이렇게 하게 되면 Base64 인코딩 스트링 나오는데, Secret 에 데이터부분에 이 스트링을 넣고 편집하면 된다.