kubectl apply の仕組み / How kubectl apply works

by Takashi Kusumi

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LVCFDUMBQQMZך➬穈׫ 5BLBTIJ,VTVNJ ;-BC

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LVCFDUMBQQMZהכ Ӝ ؔـآؙؑزָ㶷㖈׃זֽ׸ל⡲䧭 1045 ծ㶷㖈ׅ׸ל䊴ⴓ 1"5$) ׾⿾僥׃גֻ׸׷⤑ⵃז؟ـ؝وٝس وصؿؑأزח״׷㹑鎉涸 EFDMBSBUJWF ז盖椚ָ〳腉 Ӝ ⽃秪ז♳剅ֹדכזֻծ䊴ⴓ⿾僥ד֮׷ֿהח岣䠐 LVCFDUMSFQMBDFכ⽃秪ז♳剅ֹ 165 Ӝ 䊴ⴓכLVCFDUM⩎ד鎘皾ׁ׸׷

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➭ך؟ـ؝وٝسהך麩ְ ؟ـ؝وٝس ؔـآؙؑزָ㶷㖈׃זְ ؔـآؙؑزָ㶷㖈ׅ׷ BQQMZ 倜鋉⡲䧭 1045 䊴ⴓ⿾僥 1"5$) ˟ DSFBUF 倜鋉⡲䧭 1045 ⚠ؒٓ٦ SFQMBDF ⚠ؒٓ٦ ♳剅ֹ 165 QBUDI ⚠ؒٓ٦ 䊴ⴓ⿾僥 1"5$) EFMFUF ⚠ؒٓ٦ ⵴ꤐ %&-&5& ˟QSVOF׾⢪׏׋㜥さ%&-&5&׮֮׶䖤׷

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㹑鎉涸 EFDMBSBUJWF ؔـآؙؑز盖椚 Ӝ BQQMZח״׶وصؿؑأز纇㹑鎉 ׌ֽח״׷盖椚ָדֹ׷ Ӝ ؔـآؙؑزך⿾僥כLVCFDUMBQQMZGDPOH׌ֽ Ӝ QSVOF׾⢪ִל⵴ꤐ׮荈⹛ד遤ִ׷ BMQIB堣腉 Ӝ 鑫稢כⰕ䒭سًُؗٝز׾⿫撑 ,VCFSOFUFT0CKFDU.BOBHFNFOU ZBNM

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BQQMZך䊴ⴓ⿾僥

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㉏겗ٖفٔؕ侧כוֲז׷ apiVersion: extensions/v1beta1 kind: Deployment metadata: name: myapp1 spec: # レプリカ数を指定しない template: metadata: labels: run: myapp1 spec: containers: - image: nginx name: myapp1

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㉏겗ٖفٔؕ侧כוֲז׷ Ӝ ٖفٔؕ侧׾䭷㹀ׇ׆EFQMPZNFOU׾BQQMZׅ׷ LVCFDUMBQQMZGNZBQQEFQZBNM Ӝ TDBMF؝وٝسדؔـآؙؑزךٖفٔؕ侧׾ח㢌刿 LVCFDUMTDBMFSFQMJDBTEFQMPZNZBQQ Ӝ ずׄوصؿؑأز׾ⱄ䏝BQQMZׅ׷ LVCFDUMBQQMZGNZBQQEFQZBNM

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瘶ִٖفٔؕ侧כךתתחז׷

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㉏겗ٖفٔؕ侧כוֲז׷ apiVersion: extensions/v1beta1 kind: Deployment metadata: name: myapp2 spec: replicas: 3 # レプリカ数を指定 template: metadata: labels: run: myapp2 spec: containers: - image: nginx name: myapp2

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㉏겗ٖفٔؕ侧כוֲז׷ Ӝ ٖفٔؕ侧׾ח䭷㹀׃׋EFQMPZNFOU׾BQQMZׅ׷ LVCFDUMBQQMZGNZBQQEFQZBNM Ӝ TDBMF؝وٝسדؔـآؙؑزךٖفٔؕ侧׾ח㢌刿 LVCFDUMTDBMFSFQMJDBTEFQMPZNZBQQ Ӝ وصؿؑأزַ׵ٖفٔؕ侧ך鎸鶢׾չ⵴ꤐպ׃גBQQMZׅ׷ LVCFDUMBQQMZGNZBQQEFQZBNM չEFQMPZNFOUTQFDSFQMJDBTպ荈⡤ך鎸鶢׾⵴ꤐ

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瘶ִٖفٔؕ侧כחז׷

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䊴ⴓ鎘皾 ⵴ꤐⴓך鎘皾 ➙㔐ךوصؿؑأزה⵸㔐BQQMZ׃׋وصؿؑأز׾嫰鯰׃ג ⵴ꤐׁ׸׋ؿ؍٦ٕس׾鎘皾ׅ׷ ⵸㔐ⴓכMBTUBQQMJFEDPOHVSBUJPOהְֲ،ظذ٦ءّٝח ⥂㶷ׁ׸גְ׷ 鷄⸇٥㢌刿ⴓך鎘皾 ➙㔐ךوصؿؑأزה植㖈ךؔـآؙؑز׾嫰鯰׃ג鷄⸇٥㢌刿ⴓ׾鎘皾ׅ׷

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ػحثה׃ג鷏⥋ׁ׸׷ { "metadata": { "annotations": { "kubectl.kubernetes.io/last-applied-configuration": "..." } }, "spec": { "replicas": null } } curl -XPATCH -H "Content-Type: application/strategic-merge-patch+json" ... https://.../apis/extensions/v1beta1/namespaces/default/deployments/myapp https://github.com/kubernetes/community/blob/master/contributors/devel/strategic-merge-patch.md

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ֿך➬穈׫ח״׷ًٔحز Ӝ وصؿؑأزח剅ַ׸גְזְؿ؍٦ٕسכ⥂䭯ׁ׸ג刿倜 )PSJ[POUBM1PE"VUPTDBMFSך״ֲז➬穈׫ה湱䚍ָ葺ְ Ӝ وصؿؑأزַ׵չ⵴ꤐպ׃׋הְֲ䞔㜠׾⿾僥ׇׁ׵׸׷ Ӝ ⵸鶢ך㉏겗כ剑ⴱַ׵ٖفٔؕ侧׾剅ַזֽ׸לծLVCFDUM TDBMFד㢌刿׃׋⦼ךתת⥂䭯ׁ׸׷

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תה׭ Ӝ BQQMZכ♳剅ֹדכזֻ䊴ⴓ⿾僥 Ӝ 䊴ⴓ鎘皾כչ⵴ꤐⴓպהչ鷄⸇٥㢌刿ⴓպד嫰鯰㼎韋ָ殯ז׷ ⵸㔐ךوصؿؑأزָ،ظذ٦ءّٝה׃ג⥂㶷ׁ׸גְ׷ Ӝ 鑫׃ֻכ⟃♴ךⰕ䒭سًُؗٝز׾⿫撑 %FDMBSBUJWF.BOBHFNFOUPG,VCFSOFUFT0CKFDUT6TJOH $POHVSBUJPO'JMFT

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8FBSFIJSJOH CJUMZ[MBCDBSFFST