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本文檔使用 php中文網(wǎng)手冊 發(fā)布
文字
本文檔介紹公證人 CLI 的基本用法，作為支持 Docker Content Trust的工具。對于更高級的使用情況，您必須運行自己的公證服務(wù)，并且應(yīng)該讀取公證客戶端用于高級用戶文檔的用法。
什么是公證
公證是用于發(fā)布和管理可信集合內(nèi)容的工具。發(fā)布商可以對收藏進行數(shù)字簽名，消費者可以驗證內(nèi)容的完整性和來源。此功能基于簡單的密鑰管理和簽名界面來創(chuàng)建簽名集合并配置可信發(fā)布者。
通過公證，任何人都可以提供對任意數(shù)據(jù)集合的信任。使用更新框架（TUF）作為基礎(chǔ)安全框架，公證負(fù)責(zé)創(chuàng)建，管理和分發(fā)必要的操作，以確保內(nèi)容的完整性和新鮮度。
安裝公證
您可以從 GitHub 的 Notary 存儲庫版本頁面下載針對64位 Linux 或 macOS 的預(yù)編譯公證庫二進制文件。Windows 并未得到正式支持，但如果您是開發(fā)人員和 Windows 用戶，我們將非常感謝您就問題提供的任何見解。
了解公證名稱
公證處使用全球唯一名稱（GUN）來識別信托收藏。要使公證以多租戶方式運行，您必須在通過公證客戶端與 Docker Hub 交互時使用此格式。為公證客戶端指定 Docker 鏡像名稱時，GUN 格式為：
對于官方圖像（可通過“官方存儲庫”名稱識別），Docker Hub 上顯示的圖像名稱，前綴為
docker.io/library/。例如，如果你通常輸入docker pull ubuntu你必須輸入notary {cmd} docker.io/library/ubuntu。
對于所有其他圖像，Docker Hub 上顯示的圖像名稱前綴為
docker.io。
Docker Engine 客戶端為您處理這些名稱擴展，因此不要更改您在 Engine 客戶端或 API 中使用的名稱。只有通過公證客戶端與相同的 Docker Hub 存儲庫進行交互時，才需要這樣做。
檢查 Docker Hub 存儲庫
最基本的操作是將可用的簽名標(biāo)簽列入存儲庫。隔離使用的公證客戶端不知道信任存儲庫的位置。因此，您必須提供-s（或長格式--server）標(biāo)志來告訴客戶端應(yīng)該與哪個存儲庫服務(wù)器進行通信。
官方的Docker Hub公證服務(wù)器位于https://notary.docker.io。如果您想使用您自己的公證服務(wù)器，則必須使用與客戶端相同或更新的公證版本來實現(xiàn)功能兼容性（例如：客戶端版本0.2，服務(wù)器/簽署者版本> = 0.2）。此外，公證處還會將您自己的簽名密鑰和先前下載的信任元數(shù)據(jù)的緩存存儲在隨-d標(biāo)志一起提供的目錄中。與Docker Hub存儲庫進行交互時，您必須指示客戶端使用關(guān)聯(lián)的信任目錄，默認(rèn)情況下，該目錄.docker/trust位于調(diào)用用戶的主目錄內(nèi)（未能使用此目錄可能會在向您的信任數(shù)據(jù)發(fā)布更新時導(dǎo)致錯誤）：
$ notary -s https://notary.docker.io -d ~/.docker/trust list docker.io/library/alpine NAME DIGEST SIZE (BYTES) ROLE------------------------------------------------------------------------------------------------------ 2.6 e9cec9aec697d8b9d450edd32860ecd363f2f3174c8338beb5f809422d182c63 1374 targets 2.7 9f08005dff552038f0ad2f46b8e65ff3d25641747d3912e3ea8da6785046561a 1374 targets 3.1 e876b57b2444813cd474523b9c74aacacc238230b288a22bccece9caf2862197 1374 targets 3.2 4a8c62881c6237b4c1434125661cddf09434d37c6ef26bf26bfaef0b8c5e2f05 1374 targets 3.3 2d4f890b7eddb390285e3afea9be98a078c2acd2fb311da8c9048e3d1e4864d3 1374 targets edge 878c1b1d668830f01c2b1622ebf1656e32ce830850775d26a387b2f11f541239 1374 targets latest 24a36bbc059b1345b7e8be0df20f1b23caa3602e85d42fff7ecd9d0bd255de56 1377 targets
輸出顯示了可用標(biāo)記的名稱，與該標(biāo)記關(guān)聯(lián)的圖像清單的十六進制編碼的 sha256 摘要，清單的大小以及將此標(biāo)記簽署到存儲庫中的公證角色?！澳繕?biāo)”角色是簡單存儲庫中最常見的角色。當(dāng)存儲庫擁有（或期望）擁有協(xié)作者時，您可以根據(jù)管理員選擇如何組織他們的協(xié)作者的方式，將其他“委派”角色列為簽名者。
當(dāng)你運行一個docker pull命令時，Docker 引擎使用一個集成的公證庫（與公證人 CLI 相同）來請求將標(biāo)簽映射到你感興趣的一個標(biāo)簽的 sha256 摘要中（或者如果你通過--all標(biāo)志，客戶端會使用列表操作高效地檢索所有映射）。驗證了信任數(shù)據(jù)上的簽名后，客戶端將指示引擎執(zhí)行“按摘要拉取”。在此拉動過程中，引擎使用 sha256 校驗和作為內(nèi)容地址來請求并驗證 Docker 注冊表中的圖像清單。
刪除標(biāo)簽
公證人在其運行的主機上生成并存儲簽名密鑰。這意味著 Docker Hub 不能從信任數(shù)據(jù)中刪除標(biāo)簽，必須使用公證客戶端刪除它們。你可以用notary remove命令來做到這一點。同樣，您必須指示它與正確的公證服務(wù)器通話（注意，既不是您，也不是作者有權(quán)從官方的高山資料庫刪除標(biāo)簽，下面的輸出僅用于演示）：
$ notary -s https://notary.docker.io -d ~/.docker/trust remove docker.io/library/alpine 2.6Removal of 2.6 from docker.io/library/alpine staged for next publish.
在前面的示例中，輸出消息指示僅刪除已分階段。執(zhí)行任何寫入操作時，它們被分段到一個更改列表中。該列表在下一次notary publish為該存儲庫運行時應(yīng)用于最新版本的信任存儲庫。
您可以通過運行notary status修改后的存儲庫來查看未完成的更改。該status子命令是脫機操作，因此，不需要-s標(biāo)志，但它將忽略的標(biāo)志，如果提供的。未能為-d標(biāo)志提供正確的值可能會顯示錯誤的（可能是空的）更改列表：
$ notary -d ~/.docker/trust status docker.io/library/alpine Unpublished changes for docker.io/library/alpine:action scope type path----------------------------------------------------delete targets target 2.6$ notary -s https://notary.docker.io publish docker.io/library/alpine
配置客戶端
冗長而繁瑣的是，總是必須手動為大多數(shù)命令提供-s和-d標(biāo)志。創(chuàng)建預(yù)配置的 Notary 命令版本的簡單方法是通過別名。將以下內(nèi)容添加到您的.bashrc或同等設(shè)備：
alias dockernotary="notary -s https://notary.docker.io -d ~/.docker/trust"
更高級的配置方法和附加選項可以在配置文檔中找到并運行notary --help。