{"id":33123,"date":"2019-10-31T21:50:52","date_gmt":"2019-10-31T18:50:52","guid":{"rendered":"https:\/\/prohoster.info\/blog\/terraformer-infrastructure-to-code\/"},"modified":"2019-10-31T21:50:52","modified_gmt":"2019-10-31T18:50:52","slug":"terraformer-infrastructure-to-code","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/administrirovanie\/terraformer-infrastructure-to-code","title":{"rendered":"Terraformer - Infrastruktura jako k\u00f3d","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\"Terraformer
\nR\u00e1d bych v\u00e1m pov\u011bd\u011bl o nov\u00e9m CLI n\u00e1stroji, kter\u00fd jsem napsal pro \u0159e\u0161en\u00ed jedn\u00e9 star\u00e9 probl\u00e9mu. <\/p>\n

Probl\u00e9m<\/h3>\n

\nTerraform se u\u017e d\u00e1vno stal standardem v komunit\u011b DevOps\/Cloud\/IT. Je to velmi pohodln\u00fd a u\u017eite\u010dn\u00fd n\u00e1stroj pro pr\u00e1ci s infrastrukturu jako k\u00f3dem. Terraform m\u00e1 mnoho v\u00fdhod, ale tak\u00e9 spoustu klack\u016f pod nohama, ostr\u00fdch no\u017e\u016f a skryt\u00fdch past\u00ed.
\nS Terraformem je velmi snadn\u00e9 vytv\u00e1\u0159et nov\u00e9 v\u011bci a pot\u00e9 je spravovat, m\u011bnit nebo mazat. Ale co d\u011blat s t\u011bmi, kte\u0159\u00ed maj\u00ed obrovskou infrastrukturu v cloudu, kterou nevytvo\u0159ili pomoc\u00ed Terraformu? P\u0159eprogramovat a znovu vytvo\u0159it cel\u00e9 cloudov\u00e9 prost\u0159ed\u00ed je dost drah\u00e9 a riskantn\u00ed.
\nS touto problematikou jsem se setkal na dvou pracovi\u0161t\u00edch. Nejjednodu\u0161\u0161\u00ed p\u0159\u00edklad je, kdy\u017e chcete, aby v\u0161echno bylo ve form\u00e1tu git jako Terraform soubory, ale m\u00e1te v\u00edce ne\u017e 250 bucket\u016f a ps\u00e1t je ru\u010dn\u011b pro Terraform je prost\u011b p\u0159\u00edli\u0161.
\nExistuje issue<\/a><\/noindex> U\u017e od roku 2014 je zde terrafom, kter\u00fd byl uzav\u0159en v roce 2016, s nad\u011bj\u00ed, \u017ee bude implementov\u00e1no na\u010d\u00edt\u00e1n\u00ed.<\/p>\n

Celkov\u011b je to jako na obr\u00e1zku, jen zprava doleva.
\n<\/a><\/noindex><\/p>\n

Upozorn\u011bn\u00ed: Autor \u017eije polovinu \u017eivota mimo Rusko a m\u00e1lo p\u00ed\u0161e rusky. Bu\u010fte opatrn\u00ed \u2013 mohou b\u00fdt pravopisn\u00e9 chyby.<\/p>\n

\u0158e\u0161en\u00ed.<\/h3>\n

\n1. Existuj\u00ed hotov\u00e1 a star\u00e1 \u0159e\u0161en\u00ed pro AWS. terraforming<\/a><\/noindex>. Kdy\u017e jsem se pokusil pomoc\u00ed tohoto n\u00e1stroje z\u00edskat sv\u00e9 250+ bucket\u016f, uvedomil jsem si, \u017ee to je velmi \u0161patn\u00e9. AWS ji\u017e d\u00e1vno p\u0159idalo mnoho nov\u00fdch mo\u017enost\u00ed, o kter\u00fdch terraforming nev\u00ed, a nav\u00edc pou\u017e\u00edv\u00e1 Ruby. \u0160ablony vypadaj\u00ed skromn\u011b.<\/a><\/noindex>. Po 2 hodin\u00e1ch jsem poslal pull request<\/a><\/noindex> , abych p\u0159idal v\u00edce mo\u017enost\u00ed, a pochopil jsem, \u017ee takov\u00e9 \u0159e\u0161en\u00ed v\u016fbec nevyhovuje.
\nJak funguje terraforming? Bere data ze SDK AWS a generuje tf a tfstate pomoc\u00ed \u0161ablony.
\nZde jsou 3 probl\u00e9my:
\n1. V\u017edy tam bude zpo\u017ed\u011bn\u00ed v aktualizac\u00edch.
\n2. tf soubory n\u011bkdy vych\u00e1zej\u00ed po\u0161kozen\u00e9.
\n3. tfstate se vytv\u00e1\u0159\u00ed odd\u011blen\u011b od tf a ne v\u017edy se shoduje.
\nJe opravdu obt\u00ed\u017en\u00e9 z\u00edskat v\u00fdsledek, u kter\u00e9ho 'terraform plan' \u0159\u00edk\u00e1, \u017ee nedo\u0161lo k \u017e\u00e1dn\u00fdm zm\u011bn\u00e1m.<\/p>\n

2. 'terraform import' \u2013 vestav\u011bn\u00fd p\u0159\u00edkaz v Terraformu. Jak funguje?
\nNap\u00ed\u0161ete pr\u00e1zdn\u00fd TF soubor se jm\u00e9nem a typem zdroje, pot\u00e9 spust\u00edte 'terraform import' a p\u0159ed\u00e1te ID zdroje. Terraform se obrac\u00ed na poskytovatele, z\u00edsk\u00e1v\u00e1 data a vytv\u00e1\u0159\u00ed tfstate soubor.
\nZde jsou 3 probl\u00e9my:
\n1. Z\u00edsk\u00e1v\u00e1me pouze tfstate soubor, ale tf je pr\u00e1zdn\u00fd a mus\u00edme ho ps\u00e1t ru\u010dn\u011b nebo konvertovat z tfstate.
\n2. M\u016f\u017ee pracovat pouze s jedn\u00edm zdrojem najednou a nepodporuje v\u0161echny zdroje. A co m\u00e1m znovu d\u011blat s 250+ buckety?
\n3. Mus\u00edte zn\u00e1t ID zdroj\u016f \u2013 tedy mus\u00edte to obalit do k\u00f3du, kter\u00fd z\u00edsk\u00e1 seznam zdroj\u016f.
\nCelkov\u011b je v\u00fdsledek \u010d\u00e1ste\u010dn\u00fd a ne\u0161k\u00e1luje se dob\u0159e.<\/p>\n

Moje \u0159e\u0161en\u00ed
\n<\/h3>\n

Po\u017eadavky:
\n1. Mo\u017enost vytvo\u0159it soubory tf a tfstate z prost\u0159edk\u016f. Nap\u0159\u00edklad st\u00e1hnout v\u0161echny bucket\/y, security group\/\u016f, load balancer a co `terraform plan` vrac\u00ed, \u017ee nejsou \u017e\u00e1dn\u00e9 zm\u011bny
\n2. Pot\u0159ebujeme 2 cloudov\u00e9 slu\u017eby GCP + AWS
\n3. Glob\u00e1ln\u00ed \u0159e\u0161en\u00ed, kter\u00e9 se snadno aktualizuje a nevy\u017eaduje t\u0159i dny pr\u00e1ce na ka\u017ed\u00fd prost\u0159edek
\n4. Ud\u011blat open source \u2014 probl\u00e9m, kter\u00fd m\u00e1 ka\u017ed\u00fd<\/p>\n

Jazyk Go \u2014 proto ho m\u00e1m r\u00e1d, a je v n\u011bm knihovna pro vytv\u00e1\u0159en\u00ed HCL soubor\u016f, kter\u00e1 se pou\u017e\u00edv\u00e1 v terraformu + spousta k\u00f3du v terraformu, kter\u00fd m\u016f\u017ee b\u00fdt u\u017eite\u010dn\u00fd<\/p>\n

Cesta<\/h3>\n

\nPrvn\u00ed pokus
\nZa\u010dal jsem s jednoduchou variantou. Vol\u00e1n\u00ed do cloudu p\u0159es SDK pro pot\u0159ebn\u00fd prost\u0159edek a jeho p\u0159evod do pol\u00ed pro terraform. Pokus selhal hned na security group, proto\u017ee se mi nel\u00edbilo 1,5 dne p\u0159ev\u00e1d\u011bt pouze security group (resurs\u016f je hodn\u011b). Dlouh\u00e9, a pak mohou pole m\u011bnit\/p\u0159id\u00e1vat<\/p>\n

Druh\u00fd pokus
\nZalo\u017eeno na n\u00e1padu, kter\u00fd je pops\u00e1n tady<\/a><\/noindex>. Sta\u010d\u00ed vz\u00edt a p\u0159ev\u00e9st tfstate na tf. V\u0161echna data tam jsou a pole jsou stejn\u00e1. Jak z\u00edskat kompletn\u00ed tfstate pro mnoho prost\u0159edk\u016f?? Sem p\u0159i\u0161la na pomoc p\u0159\u00edkaz `terraform refresh`. Terraform vezme v\u0161echny prost\u0159edky v tfstate a podle ID vyt\u00e1hne data a zap\u00ed\u0161e v\u0161e do tfstate. To znamen\u00e1 vytvo\u0159it pr\u00e1zdn\u00fd tfstate pouze s n\u00e1zvy a ID, spustit `terraform refresh` a dostaneme pln\u00e9 tfstate. Hur\u00e1!
\nTe\u010f se pust\u00edme do rekurzivn\u00edho psan\u00ed p\u0159evodn\u00edku pro tfstate na tf. Pro ty, kte\u0159\u00ed nikdy ne\u010detli tfstate, to je JSON, ale speci\u00e1ln\u00ed.
\nZde je jeho d\u016fle\u017eit\u00e1 \u010d\u00e1st attributes<\/p>\n

 \"attributes\": {\n                            \"id\": \"default\/backend-logging-load-deployment\",\n                            \"metadata.#\": \"1\",\n                            \"metadata.0.annotations.%\": \"0\",\n                            \"metadata.0.generate_name\": \"\",\n                            \"metadata.0.generation\": \"24\",\n                            \"metadata.0.labels.%\": \"1\",\n                            \"metadata.0.labels.app\": \"backend-logging\",\n                            \"metadata.0.name\": \"backend-logging-load-deployment\",\n                            \"metadata.0.namespace\": \"default\",\n                            \"metadata.0.resource_version\": \"109317427\",\n                            \"metadata.0.self_link\": \"\\\/apis\\\/apps\\\/v1\\\/namespaces\\\/default\\\/deployments\\\/backend-logging-load-deployment\",\n                            \"metadata.0.uid\": \"300ecda1-4138-11e9-9d5d-42010a8400b5\",\n                            \"spec.#\": \"1\",\n                            \"spec.0.min_ready_seconds\": \"0\",\n                            \"spec.0.paused\": \"false\",\n                            \"spec.0.progress_deadline_seconds\": \"600\",\n                            \"spec.0.replicas\": \"1\",\n                            \"spec.0.revision_history_limit\": \"10\",\n                            \"spec.0.selector.#\": \"1\",\n<\/code><\/pre>\n
\nTady je:
\n1. id \u2014 string
\n2. metadata \u2014 pole velikosti 1 a v n\u011bm objekt s poli uveden\u00fdmi n\u00ed\u017ee
\n3. spec \u2014 hash velikosti 1 a v n\u011bm key,value
\nZkr\u00e1tka z\u00e1bavn\u00fd form\u00e1t, v\u0161echno m\u016f\u017ee b\u00fdt do hloubky tak\u00e9 na n\u011bkolik \u00farovn\u00ed<\/p>\n
                   \"spec.#\": \"1\",\n                            \"spec.0.min_ready_seconds\": \"0\",\n                            \"spec.0.paused\": \"false\",\n                            \"spec.0.progress_deadline_seconds\": \"600\",\n                            \"spec.0.replicas\": \"1\",\n                            \"spec.0.revision_history_limit\": \"10\",\n                            \"spec.0.selector.#\": \"1\",\n                            \"spec.0.selector.0.match_expressions.#\": \"0\",\n                            \"spec.0.selector.0.match_labels.%\": \"1\",\n                            \"spec.0.selector.0.match_labels.app\": \"backend-logging-load\",\n                            \"spec.0.strategy.#\": \"0\",\n                            \"spec.0.template.#\": \"1\",\n                            \"spec.0.template.0.metadata.#\": \"1\",\n                            \"spec.0.template.0.metadata.0.annotations.%\": \"0\",\n                            \"spec.0.template.0.metadata.0.generate_name\": \"\",\n                            \"spec.0.template.0.metadata.0.generation\": \"0\",\n                            \"spec.0.template.0.metadata.0.labels.%\": \"1\",\n                            \"spec.0.template.0.metadata.0.labels.app\": \"backend-logging-load\",\n                            \"spec.0.template.0.metadata.0.name\": \"\",\n                            \"spec.0.template.0.metadata.0.namespace\": \"\",\n                            \"spec.0.template.0.metadata.0.resource_version\": \"\",\n                            \"spec.0.template.0.metadata.0.self_link\": \"\",\n                            \"spec.0.template.0.metadata.0.uid\": \"\",\n                            \"spec.0.template.0.spec.#\": \"1\",\n                            \"spec.0.template.0.spec.0.active_deadline_seconds\": \"0\",\n                            \"spec.0.template.0.spec.0.container.#\": \"1\",\n                            \"spec.0.template.0.spec.0.container.0.args.#\": \"3\",<\/code><\/pre>\n
\nPokud chcete \u00falohu na programov\u00e1n\u00ed pro pohovor, prost\u011b si nechte napsat parser na tohle \ud83d\ude42
\nPo dlouh\u00fdch pokusech napsat parser bez chyb jsem na\u0161el \u010d\u00e1st jeho v k\u00f3du terraform, a to nejd\u016fle\u017eit\u011bj\u0161\u00ed. A v\u0161e vypadalo norm\u00e1ln\u011b.<\/p>\n
PokAttempt t\u0159i
\nTerraform provider je bin\u00e1rka, kter\u00e1 obsahuje k\u00f3d se v\u0161emi zdroji a logikou pro pr\u00e1ci s API cloud\u016f. Ka\u017ed\u00fd cloud m\u00e1 sv\u00e9ho poskytovatele a terraform je pouze vol\u00e1 prost\u0159ednictv\u00edm sv\u00e9ho protokolu RPC mezi dv\u011bma procesy.
\nTe\u010f jsem se rozhodl komunikovat p\u0159\u00edmo s terraform providery prost\u0159ednictv\u00edm RPC vol\u00e1n\u00ed. Dopadlo to hezky a umo\u017enilo to m\u011bnit terraform providery na nov\u011bj\u0161\u00ed verze a z\u00edsk\u00e1vat nov\u00e9 mo\u017enosti, ani\u017e bych musel m\u011bnit k\u00f3d. Tak\u00e9 se uk\u00e1zalo, \u017ee ne v\u0161echna pole v tfstate mus\u00ed b\u00fdt v tf, jak to zjistit? Jedin\u011b se to zeptat providera. Pak za\u010dalo dal\u0161\u00ed kolo slo\u017eit\u00e9ho sh\u00e1n\u011bn\u00ed regul\u00e1rn\u00edch v\u00fdraz\u016f pro hled\u00e1n\u00ed pol\u00ed uvnit\u0159 tfstate na v\u0161ech \u00farovn\u00edch.<\/p>\n
Na konci mi vy\u0161el u\u017eite\u010dn\u00fd CLI n\u00e1stroj, kter\u00fd m\u00e1 spole\u010dnou infrastrukturu pro v\u0161echny terraform providery a umo\u017e\u0148uje snadno p\u0159id\u00e1vat nov\u00e9. Tak\u00e9 p\u0159id\u00e1n\u00ed zdroj\u016f zab\u00edr\u00e1 m\u00e1lo k\u00f3du. Plus r\u016fzn\u00e9 vychyt\u00e1vky jako spojen\u00ed mezi zdroji. Samoz\u0159ejm\u011b bylo spoustu r\u016fzn\u00fdch probl\u00e9m\u016f, kter\u00e9 se nedaj\u00ed v\u0161echny popsat.
\nNazval jsem ten n\u00e1stroj Terrafomer. <\/p>\n
Fina\u0142<\/h3>\n
\nPomoc\u00ed Terrafomeru jsme vygenerovali 500-700 tis\u00edc \u0159\u00e1dk\u016f k\u00f3du tf + tfstate ve dvou cloudech. Dok\u00e1zali jsme vz\u00edt legacy v\u011bci a za\u010d\u00edt je upravovat pouze prost\u0159ednictv\u00edm terraformu, jak se to d\u011bl\u00e1 v nejlep\u0161\u00edch prax\u00edch infrastruktury jako k\u00f3du. Je to prost\u011b magie, kdy\u017e vezmete ob\u0159\u00ed cloud a z\u00edsk\u00e1te ho prost\u0159ednictv\u00edm p\u0159\u00edkazu ve form\u011b pracovn\u00edch terraform soubor\u016f. A d\u00e1l grep\/replace\/git a tak d\u00e1le.<\/p>\n
Vypo\u010d\u00edtal jsem a uspo\u0159\u00e1dal, z\u00edskal povolen\u00ed. Publikoval jsem to na Githubu pro v\u0161echny ve \u010dtvrtek (02.05.19). github.com\/GoogleCloudPlatform\/terraformer<\/a><\/noindex>
\nU\u017e jsem z\u00edskal 600 hv\u011bzd, 2 pull requesty k p\u0159id\u00e1n\u00ed podpory pro OpenStack a Kubernetes. Dobr\u00e9 recenze. Celkov\u011b je projekt u\u017eite\u010dn\u00fd pro lidi.
\nDoporu\u010duji v\u0161em, kte\u0159\u00ed cht\u011bj\u00ed za\u010d\u00edt pracovat s Terraform a necht\u011bj\u00ed p\u0159episovat v\u0161echno. 
\nBudu r\u00e1d za pull requesty, probl\u00e9my, hv\u011bzdy.<\/p>\n
Demo
\n\"Terraformer<\/noindex>
\n
Zdroj: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
\u0425\u043e\u0442\u0435\u043b \u0431\u044b \u0440\u0430\u0441\u0441\u043a\u0430\u0437\u0430\u0442\u044c \u043f\u0440\u043e \u043d\u043e\u0432\u044b\u0439 CLI tool \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u044f \u043d\u0430\u043f\u0438\u0441\u0430\u043b \u0434\u043b\u044f \u0440\u0435\u0448\u0435\u043d\u0438\u044f \u043e\u0434\u043d\u043e\u0439 \u0441\u0442\u0430\u0440\u043e\u0439 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 Terraform \u0443\u0436\u0435 \u0434\u0430\u0432\u043d\u043e \u0441\u0442\u0430\u043b \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043e\u043c \u0432 Devops\/Cloud\/IT \u0441\u043e\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u0435. \u0412\u0435\u0449\u044c \u043e\u0447\u0435\u043d\u044c \u0443\u0434\u043e\u0431\u043d\u0430\u044f \u0438 \u043f\u043e\u043b\u0435\u0437\u043d\u0430\u044f \u0447\u0442\u043e\u0431 \u0437\u0430\u043d\u0438\u043c\u0430\u0442\u0441\u044f infrastructure as code. \u0415\u0441\u0442\u044c \u043c\u043d\u043e\u0433\u043e \u043f\u0440\u0435\u043b\u0435\u0441\u0442\u0435\u0439 \u0432 Terraform \u0430 \u0442\u0430\u043a \u0436\u0435 \u043c\u043d\u043e\u0433\u043e \u0432\u0438\u043b\u043e\u043a, \u043e\u0441\u0442\u0440\u044b\u0445 \u043d\u043e\u0436\u0435\u0439 \u0438 \u0433\u0440\u0430\u0431\u043b\u0435\u0439. \u0421 Terraform \u043e\u0447\u0435\u043d\u044c \u0443\u0434\u043e\u0431\u043d\u043e \u0434\u0435\u043b\u0430\u0442\u044c \u043d\u043e\u0432\u044b\u0435 \u0432\u0435\u0449\u0438 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