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| <h1 class="title">ZooKeeper Authentication</h1> |
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| <h2 id="new-clusters">New Clusters</h2> |
| |
| <p>To enable <code class="highlighter-rouge">ZooKeeper</code> authentication on Bookies or Clients, there are two necessary steps:</p> |
| |
| <ol> |
| <li>Create a <code class="highlighter-rouge">JAAS</code> login file and set the appropriate system property to point to it as described in <a href="../sasl#notes">GSSAPI (Kerberos)</a>.</li> |
| <li>Set the configuration property <code class="highlighter-rouge">zkEnableSecurity</code> in each bookie to <code class="highlighter-rouge">true</code>.</li> |
| </ol> |
| |
| <p>The metadata stored in <code class="highlighter-rouge">ZooKeeper</code> is such that only certain clients will be able to modify and read the corresponding znodes. |
| The rationale behind this decision is that the data stored in ZooKeeper is not sensitive, but inappropriate manipulation of znodes can cause cluster |
| disruption.</p> |
| |
| <h2 id="migrating-clusters">Migrating Clusters</h2> |
| |
| <p>If you are running a version of BookKeeper that does not support security or simply with security disabled, and you want to make the cluster secure, |
| then you need to execute the following steps to enable ZooKeeper authentication with minimal disruption to your operations.</p> |
| |
| <ol> |
| <li>Perform a rolling restart setting the <code class="highlighter-rouge">JAAS</code> login file, which enables bookie or clients to authenticate. At the end of the rolling restart, |
| bookies (or clients) are able to manipulate znodes with strict ACLs, but they will not create znodes with those ACLs.</li> |
| <li>Perform a second rolling restart of bookies, this time setting the configuration parameter <code class="highlighter-rouge">zkEnableSecurity</code> to true, which enables the use |
| of secure ACLs when creating znodes.</li> |
| <li>Currently we don’t have provide a tool to set acls on old znodes. You are recommended to set it manually using ZooKeeper tools.</li> |
| </ol> |
| |
| <p>It is also possible to turn off authentication in a secured cluster. To do it, follow these steps:</p> |
| |
| <ol> |
| <li>Perform a rolling restart of bookies setting the <code class="highlighter-rouge">JAAS</code> login file, which enable bookies to authenticate, but setting <code class="highlighter-rouge">zkEnableSecurity</code> to <code class="highlighter-rouge">false</code>. |
| At the end of rolling restart, bookies stop creating znodes with secure ACLs, but are still able to authenticate and manipulate all znodes.</li> |
| <li>You can use ZooKeeper tools to manually reset all ACLs under the znode set in <code class="highlighter-rouge">zkLedgersRootPath</code>, which defaults to <code class="highlighter-rouge">/ledgers</code>.</li> |
| <li>Perform a second rolling restart of bookies, this time omitting the system property that sets the <code class="highlighter-rouge">JAAS</code> login file.</li> |
| </ol> |
| |
| <h2 id="migrating-the-zookeeper-ensemble">Migrating the ZooKeeper ensemble</h2> |
| |
| <p>It is also necessary to enable authentication on the <code class="highlighter-rouge">ZooKeeper</code> ensemble. To do it, we need to perform a rolling restart of the ensemble and |
| set a few properties. Please refer to the ZooKeeper documentation for more details.</p> |
| |
| <ol> |
| <li><a href="http://zookeeper.apache.org/doc/r3.4.6/zookeeperProgrammers.html#sc_ZooKeeperAccessControl">Apache ZooKeeper Documentation</a></li> |
| <li><a href="https://cwiki.apache.org/confluence/display/ZOOKEEPER/Zookeeper+and+SASL">Apache ZooKeeper Wiki</a></li> |
| </ol> |
| |
| </section> |
| |
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| <a class="pagination-previous" href="../sasl">Previous</a> |
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| <div class="column is-2 is-hidden-mobile"> |
| |
| |
| <div class="toc"> |
| <h2 class="title">ZooKeeper Authentication</h2> |
| <ul class="section-nav"> |
| <li class="toc-entry toc-h2"><a href="#new-clusters">New Clusters</a></li> |
| <li class="toc-entry toc-h2"><a href="#migrating-clusters">Migrating Clusters</a></li> |
| <li class="toc-entry toc-h2"><a href="#migrating-the-zookeeper-ensemble">Migrating the ZooKeeper ensemble</a></li> |
| </ul> |
| </div> |
| |
| |
| |
| </div> |
| </div> |
| </div> |
| |
| |
| |
| <div id="entry-popover-html" class="popover-template"> |
| <p>An entry is a sequence of bytes (plus some metadata) written to a BookKeeper ledger. Entries are also known as records.</p> |
| |
| </div> |
| |
| <div id="ledger-popover-html" class="popover-template"> |
| <p>A ledger is a sequence of entries written to BookKeeper. Entries are written sequentially to ledgers and at most once, giving ledgers append-only semantics.</p> |
| |
| </div> |
| |
| <div id="bookie-popover-html" class="popover-template"> |
| <p>A bookie is an individual BookKeeper storage server.</p> |
| |
| <p>Bookies store the content of ledgers and act as a distributed ensemble.</p> |
| |
| </div> |
| |
| <div id="rereplication-popover-html" class="popover-template"> |
| <p>A subsystem that runs in the background on bookies to ensure that ledgers are fully replicated even if one bookie from the ensemble is down.</p> |
| |
| </div> |
| |
| <div id="striping-popover-html" class="popover-template"> |
| <p>Striping is the process of distributing BookKeeper ledgers to sub-groups of bookies rather than to all bookies in a BookKeeper ensemble.</p> |
| |
| <p>Striping is essential to ensuring fast performance.</p> |
| |
| </div> |
| |
| <div id="striped-popover-html" class="popover-template"> |
| <p>Striping is the process of distributing BookKeeper ledgers to sub-groups of bookies rather than to all bookies in a BookKeeper ensemble.</p> |
| |
| <p>Striping is essential to ensuring fast performance.</p> |
| |
| </div> |
| |
| <div id="journal-popover-html" class="popover-template"> |
| <p>A journal file stores BookKeeper transaction logs.</p> |
| |
| </div> |
| |
| <div id="fencing-popover-html" class="popover-template"> |
| <p>When a reader forces a ledger to close, preventing any further entries from being written to the ledger.</p> |
| |
| </div> |
| |
| <div id="record-popover-html" class="popover-template"> |
| <p>A record is a sequence of bytes (plus some metadata) written to a BookKeeper ledger. Records are also known as entries.</p> |
| |
| </div> |
| |
| |
| <script type="text/javascript"> |
| |
| tippy('#entry-popover', { |
| html: '#entry-popover-html', |
| arrow: true, |
| animation: 'fade' |
| }); |
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| tippy('#ledger-popover', { |
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| }); |
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| arrow: true, |
| animation: 'fade' |
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