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Redis哨兵的自动故障转移
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#IAJL52
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2024-08-13 10:12
<p>请解释Redis哨兵如何进行自动故障转移，并给出示例。</p><br><p>Redis哨兵在检测到主实例故障后，会经过以下步骤完成自动故障转移：</p> <ol> <li><strong>故障检测</strong>：哨兵节点通过心跳检测主实例是否故障。</li> <li><strong>投票机制</strong>：当某个哨兵节点认为主实例故障时，需要其他哨兵节点投票确认。</li> <li><strong>选举新主实例</strong>：在确认主实例故障后，选举一个从实例作为新的主实例。</li> <li><strong>通知从实例</strong>：将其他从实例指向新的主实例。</li> <li><strong>通知客户端</strong>：通过API通知客户端新的主实例地址。</li> </ol> <p>示例代码：</p> <pre><code class="language-shell"># 启动哨兵 redis-sentinel /path/to/sentinel.conf</code></pre> <p>假设主实例故障后，哨兵会自动选举一个从实例并进行故障转移：</p> <pre><code class="language-properties"># 哨兵日志中会显示 +new-epoch 1 +try-failover master mymaster 127.0.0.1 6379 +failover-state-wait-start +selected-slave slave 127.0.0.1:6380 127.0.0.1 6380 @ mymaster 127.0.0.1 6379 +failover-state-select-slave +failover-state-send-slaveof-noone slave 127.0.0.1:6380 127.0.0.1 6380 @ mymaster 127.0.0.1 6379</code></pre>
<p>请解释Redis哨兵如何进行自动故障转移，并给出示例。</p><br><p>Redis哨兵在检测到主实例故障后，会经过以下步骤完成自动故障转移：</p> <ol> <li><strong>故障检测</strong>：哨兵节点通过心跳检测主实例是否故障。</li> <li><strong>投票机制</strong>：当某个哨兵节点认为主实例故障时，需要其他哨兵节点投票确认。</li> <li><strong>选举新主实例</strong>：在确认主实例故障后，选举一个从实例作为新的主实例。</li> <li><strong>通知从实例</strong>：将其他从实例指向新的主实例。</li> <li><strong>通知客户端</strong>：通过API通知客户端新的主实例地址。</li> </ol> <p>示例代码：</p> <pre><code class="language-shell"># 启动哨兵 redis-sentinel /path/to/sentinel.conf</code></pre> <p>假设主实例故障后，哨兵会自动选举一个从实例并进行故障转移：</p> <pre><code class="language-properties"># 哨兵日志中会显示 +new-epoch 1 +try-failover master mymaster 127.0.0.1 6379 +failover-state-wait-start +selected-slave slave 127.0.0.1:6380 127.0.0.1 6380 @ mymaster 127.0.0.1 6379 +failover-state-select-slave +failover-state-send-slaveof-noone slave 127.0.0.1:6380 127.0.0.1 6380 @ mymaster 127.0.0.1 6379</code></pre>
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