{"id":36736,"date":"2019-10-31T22:13:26","date_gmt":"2019-10-31T19:13:26","guid":{"rendered":"https:\/\/prohoster.info\/blog\/istoriya-problemy-perenosa-docker-storage-docker-root\/"},"modified":"2019-10-31T22:13:26","modified_gmt":"2019-10-31T19:13:26","slug":"istoriya-problemy-perenosa-docker-storage-docker-root","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/administrirovanie\/istoriya-problemy-perenosa-docker-storage-docker-root","title":{"rendered":"Storia del trasferimento dello storage di docker (root di docker)","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Non pi\u00f9 di qualche giorno fa, \u00e8 stato deciso di spostare lo storage di docker (la cartella in cui docker memorizza tutti i file dei container e delle immagini) su una partizione separata che <br \/>\naveva una maggiore capacit\u00e0. L'operazione sembrava banale e non preannunciava problemi...<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nIniziamo:<\/p>\n<p>1. Arrestiamo e uccidiamo tutti i container della nostra applicazione: <\/p>\n<pre><code class=\"bash\">docker-compose down<\/code><\/pre>\n<p>\nse ci sono molti container e sono in vari compose, possiamo fare cos\u00ec: <\/p>\n<pre><code class=\"bash\">docker rm -f $(docker ps -q)<\/code><\/pre>\n<p>\n2. Arrestiamo il demone docker: <\/p>\n<pre><code class=\"bash\">systemctl stop docker<\/code><\/pre>\n<p>\n3. Spostiamo la cartella nel luogo desiderato: <\/p>\n<pre><code class=\"bash\">cp -r \/var\/lib\/docker \/docker\/data\/storage<\/code><\/pre>\n<p>\n4. Informiamo il demone di docker di guardare nella nuova directory. Ci sono diverse opzioni: o specificare il nuovo percorso con il flag -g, oppure utilizzare i file di configurazione di systemd, che abbiamo utilizzato. Oppure un symlink. Non entrer\u00f2 nei dettagli, ci sono <noindex><a rel=\"nofollow\" href=\"https:\/\/linuxconfig.org\/how-to-move-docker-s-default-var-lib-docker-to-another-directory-on-ubuntu-debian-linux\">molti<\/a><\/noindex> manuali su come spostare il root di docker in un nuovo posto.<\/p>\n<p>5. Avviamo il demone di docker e controlliamo che stia guardando dove deve: <\/p>\n<pre><code class=\"bash\">systemctl status docker<\/code><\/pre>\n<p>\nIn una delle righe di output dovremmo vedere:<\/p>\n<pre><code class=\"bash\">\u251c\u250019493 \/usr\/bin\/dockerd --data-root=\/docker\/data\/storage<\/code><\/pre>\n<p>\nVerificato che abbiamo passato l'opzione al demone, ora controlliamo se l'ha applicata (grazie a <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/users\/inkvizitor68sl\/\" class=\"user_link\">inkvizitor68sl<\/a><\/noindex>)!<\/p>\n<pre><code class=\"bash\">docker info | awk '\/Root Dir\/ {print $NF}' <\/code><\/pre>\n<p>\n6. Avviamo la nostra applicazione: <\/p>\n<pre><code class=\"bash\">docker-compose up -d<\/code><\/pre>\n<p>\n7. Controlliamo<\/p>\n<p>E qui inizia la parte pi\u00f9 interessante, DBMS, MQ, tutto ok! Il database \u00e8 integro, tutto funziona\u2026 tranne nginx. Abbiamo una nostra build di nginx con kerberos e cortigiane. E controllando i log del container, ho notato che non pu\u00f2 scrivere in \/var\/tmp \u2014 Permission denied. Mi massaggio le tempie e cerco di analizzare la situazione\u2026 Come mai? L'immagine Docker non \u00e8 cambiata. Abbiamo semplicemente spostato la directory. Ha sempre funzionato, e ora\u2026 Per esperimento sono entrato manualmente nel container e ho cambiato i permessi su questa cartella, erano<u> root, root 755<\/u>, ho dato <u>root, root 777<\/u>. E tutto ha iniziato a funzionare\u2026 \u00c8 sorto un pensiero nella mia mente \u2014 \u00e8 una follia\u2026 Ho pensato, forse mi \u00e8 sfuggito qualche dettaglio\u2026 <\/p>\n<p>Ho deciso che abbiamo perso i permessi sui file durante il trasferimento. Abbiamo fermato l'applicazione, il demone Docker, eliminato la nuova directory e copiato la directory \/var\/lib\/docker usando <code>rsync -a<\/code>. <\/p>\n<p>Penso che ora sia tutto a posto, avviamo Docker, l'applicazione.<\/p>\n<p>Ehi\u2026 il problema persiste\u2026 Mi \u00e8 partito un tic. Sono corso alla console della mia macchina virtuale, dove eseguo vari test. Avevo questa immagine di nginx e sono entrato nel contenitore, e qui nella cartella \/var\/tmp i permessi sono impostati su root, root 777. Cio\u00e8, gli stessi che ho dovuto impostare manualmente. Ma le immagini sono identiche! <\/p>\n<p><u>\u00c8 stato utilizzato ovunque il file system xfs.<\/u><\/p>\n<p>Ho confrontato tramite il comando <\/p>\n<pre><code class=\"bash\">docker inspect my-nginx:12345<\/code><\/pre>\n<p>\nTutti gli hash sono identici, tutto \u00e8 uno a uno. Sia sul server che sulla mia macchina virtuale. Ho rimosso l'immagine locale di nginx e l'ho pullata di nuovo dal registry, che per varie ragioni si trova sulla stessa macchina. E il problema \u00e8 lo stesso\u2026 Adesso mi \u00e8 partito anche l'altro occhio.<\/p>\n<p>Non ricordo gi\u00e0 pi\u00f9 quali pensieri avessi in testa, oltre a urlare \u00abAAAAAA\u00bb e altro. Sono le 4 del mattino, ho tirato fuori i sorgenti di docker per capire il principio di hashing dei layers dell'immagine. Ho aperto la terza lattina di energy drink. E alla fine mi \u00e8 chiaro che l'hash tiene conto solo del file, del suo contenuto, ma <b>NON DEI PERMESSI<\/b>! Quindi, in qualche modo misterioso, i permessi si sono incasinati, eppure selinux \u00e8 disattivato, acl non sono utilizzati, e non c'\u00e8 sticky bit. <\/p>\n<p>Ho rimosso l'immagine locale, ho anche eliminato l'immagine dal docker registry e ho fatto un nuovo push. E tutto ha funzionato. Risulta che durante il trasferimento i permessi siano stati danneggiati sia all'interno dell'immagine locale che in quella nel registry. Come ho gi\u00e0 detto, per vari motivi era collocata sulla stessa macchina. E di conseguenza, nella stessa directory \/var\/lib\/docker.<\/p>\n<p>E prevedendo la domanda, non abbiamo provato a riportare Docker sul vecchio catalogo \u2014 no, non abbiamo provato, purtroppo le circostanze non lo consentivano. E avevo davvero voglia di capirlo.<\/p>\n<p>Dopo aver scritto questo articolo, la soluzione al problema mi sembra ovvia, ma al momento dell'analisi non pareva tale. Ho fatto ricerche oneste, e non ho trovato situazioni simili.<\/p>\n<p>Risultato: problema risolto, ma non ho capito la causa =(<\/p>\n<p>Se qualcuno sa o ha qualche idea sui possibili motivi di questo problema \u2014 sarei molto felice di ascoltarvi nei commenti!<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/462013\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041d\u0435 \u0434\u0430\u043b\u0435\u0435, \u0447\u0435\u043c \u043f\u0430\u0440\u0443 \u0434\u043d\u0435\u0439 \u043d\u0430\u0437\u0430\u0434 \u0431\u044b\u043b\u043e \u0440\u0435\u0448\u0435\u043d\u043e \u043d\u0430 \u043e\u0434\u043d\u043e\u043c \u0438\u0437 \u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432 \u0432\u044b\u043d\u0435\u0441\u0442\u0438 docker storage (\u043a\u0430\u0442\u0430\u043b\u043e\u0433, \u0433\u0434\u0435 \u0434\u043e\u043a\u0435\u0440 \u0445\u0440\u0430\u043d\u0438\u0442 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\u043d\u0430\u0448\u0435\u0433\u043e \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f: docker-compose down \u0435\u0441\u043b\u0438 \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u043e\u0432 \u043c\u043d\u043e\u0433\u043e, \u0438 \u043e\u043d\u0438 \u0432 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-36736","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041d\u0435 \u0434\u0430\u043b\u0435\u0435, \u0447\u0435\u043c \u043f\u0430\u0440\u0443 \u0434\u043d\u0435\u0439 \u043d\u0430\u0437\u0430\u0434 \u0431\u044b\u043b\u043e \u0440\u0435\u0448\u0435\u043d\u043e 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L'attivit\u00e0 sembrava banale e non preannunciava problemi... Procediamo: 1. Fermiamo e uccidiamo tutti i container della nostra applicazione: docker-compose down se ci sono molti container, e sono in","canonical_url":"https:\/\/prohoster.info\/it\/blog\/administrirovanie\/istoriya-problemy-perenosa-docker-storage-docker-root","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0418\u0441\u0442\u043e\u0440\u0438\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u043f\u0435\u0440\u0435\u043d\u043e\u0441\u0430 docker storage (docker root) | ProHoster","og:description":"\u041d\u0435 \u0434\u0430\u043b\u0435\u0435, 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