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基于docker的redis集群搭建.html
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基于docker的redis集群搭建.html
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基于Docker的Redis集群搭建
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<time title="创建时间：2020-07-19 15:53:09 / 修改时间：16:06:14" itemprop="dateCreated datePublished" datetime="2020-07-19T15:53:09+08:00">2020-07-19</time>
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<h1 id="本机环境"><a href="#本机环境" class="headerlink" title="本机环境"></a>本机环境</h1><ul>
<li>操作系统：CentOS8，由Vmware虚拟机创建，网络使用桥接模式</li>
<li>Docker版本：19.03.12</li>
<li>Redis版本：5.0.3</li>
</ul><h1 id="前期准备"><a href="#前期准备" class="headerlink" title="前期准备"></a>前期准备</h1><p>安装并启动Docker</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">sudo yum install docker -y</span><br><span class="line">sudo service docker start</span><br></pre></td></tr></table></figure><p>获取Redis镜像</p><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">docker pull redis</span><br></pre></td></tr></table></figure><a id="more"></a>
<h1 id="创建集群配置文件模板"><a href="#创建集群配置文件模板" class="headerlink" title="创建集群配置文件模板"></a>创建集群配置文件模板</h1><p>首先创建一个文件夹，用于存放配置文件模板，稍后也用于存放Redis集群数据文件</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">mkdir ~/redis_cluster</span><br><span class="line"><span class="built_in">cd</span> ~/redis_cluster</span><br></pre></td></tr></table></figure>
<p>新建模板文件<code>vim redis_cluster.tmpl</code>，并写入以下配置（注意此处的Cluster IP，需要根据自己的宿主机IP地址来填写）：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br></pre></td><td class="code"><pre><span class="line"># Redis Port</span><br><span class="line">port ${PORT}</span><br><span class="line"></span><br><span class="line"># Protected mode off</span><br><span class="line">protected-mode no</span><br><span class="line"></span><br><span class="line"># Cluster enable</span><br><span class="line">cluster-enabled yes</span><br><span class="line"></span><br><span class="line"># Cluster node conf</span><br><span class="line">cluster-config-file nodes.conf</span><br><span class="line"></span><br><span class="line"># Timeout</span><br><span class="line">cluster-node-timeout 5000</span><br><span class="line"></span><br><span class="line"># Cluster IP</span><br><span class="line">cluster-announce-ip 192.168.1.103</span><br><span class="line"></span><br><span class="line"># Cluster Port-range: 8090-8095</span><br><span class="line">cluster-announce-port ${PORT}</span><br><span class="line">cluster-announce-bus-port 1${PORT}</span><br><span class="line"></span><br><span class="line"># Enable append only back up mode</span><br><span class="line">appendonly yes</span><br><span class="line"></span><br><span class="line"># Back up frequency</span><br><span class="line">appendfsync everysec</span><br><span class="line"></span><br><span class="line"># Disable aof comprass sync</span><br><span class="line">no-appendfsync-on-rewrite no</span><br><span class="line"></span><br><span class="line"># Aof rewrite percentage</span><br><span class="line">auto-aof-rewrite-percentage 100</span><br><span class="line"></span><br><span class="line"># Aof rewrite size</span><br><span class="line">auto-aof-rewrite-min-size 512mb</span><br><span class="line"></span><br><span class="line"># Disable back up</span><br><span class="line">save ""</span><br></pre></td></tr></table></figure>
<h1 id="新建批量生成单个Redis配置的脚本"><a href="#新建批量生成单个Redis配置的脚本" class="headerlink" title="新建批量生成单个Redis配置的脚本"></a>新建批量生成单个Redis配置的脚本</h1><p><code>vim mkconf.sh</code>，随后填入以下内容，此处我的Redis集群端口从8090开始到8095，可根据需要自行修改</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">for</span> port <span class="keyword">in</span> `seq 8090 8095`; <span class="keyword">do</span> \</span><br><span class="line"> mkdir -p ./<span class="variable">${port}</span>/conf \</span><br><span class="line"> && PORT=<span class="variable">${port}</span> envsubst < ./redis_cluster.tmpl > ./<span class="variable">${port}</span>/conf/redis.conf \</span><br><span class="line"> && mkdir -p ./<span class="variable">${port}</span>/data; \</span><br><span class="line"><span class="keyword">done</span></span><br></pre></td></tr></table></figure>
<p>然后赋予可执行权限并运行该脚本</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">chmod +x mkconf.sh</span><br><span class="line">./mkconf.sh</span><br></pre></td></tr></table></figure>
<h1 id="新建批量生成Docker容器的脚本"><a href="#新建批量生成Docker容器的脚本" class="headerlink" title="新建批量生成Docker容器的脚本"></a>新建批量生成Docker容器的脚本</h1><p><code>vim mkcontainer.sh</code>，随后填入以下内容</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">for</span> port <span class="keyword">in</span> `seq 8090 8095`; <span class="keyword">do</span> \</span><br><span class="line"> docker run -d -it \</span><br><span class="line"> -v ~/redis_cluster/<span class="variable">${port}</span>/conf/redis.conf:/usr/<span class="built_in">local</span>/etc/redis/redis.conf \</span><br><span class="line"> -v ~/redis_cluster/<span class="variable">${port}</span>/data:/data \</span><br><span class="line"> --restart always --name redis-<span class="variable">${port}</span> --net host \</span><br><span class="line"> --sysctl net.core.somaxconn=1024 redis redis-server /usr/<span class="built_in">local</span>/etc/redis/redis.conf; \</span><br><span class="line"><span class="keyword">done</span></span><br></pre></td></tr></table></figure>
<h1 id="建立Redis集群"><a href="#建立Redis集群" class="headerlink" title="建立Redis集群"></a>建立Redis集群</h1><p>如果宿主机已经安装了<code>redis-cli</code>，就不用进入到容器内部了，可以直接在宿主机上操作</p>
<p>如果宿主机没有安装<code>redis-cli</code>，则执行以下命令随便进入一个容器中</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">docker <span class="built_in">exec</span> -it redis-8090 bash</span><br></pre></td></tr></table></figure>
<p>执行以下命令创建集群</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">redis-cli --cluster create 192.168.1.103:8090 192.168.1.103:8091 192.168.1.103:8092 192.168.1.103:8093 192.168.1.103:8094 192.168.1.103:8095 --cluster-replicas 1</span><br></pre></td></tr></table></figure>
<p><img src="images/docker/createcluster.png" alt="创建集群"></p>
<p>出现以上图中的询问，输入yes回车即可，自此Redis集群就创建成功了</p>
<h1 id="验证集群可用性"><a href="#验证集群可用性" class="headerlink" title="验证集群可用性"></a>验证集群可用性</h1><p>登录其中的一个节点</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">redis-cli -c -h 192.168.1.18 -p 8090</span><br></pre></td></tr></table></figure>
<p>查看集群节点信息，同时也可以试着写入数据，能查看到节点信息，能写入、读取数据，表示集群搭建成功</p>
<p><img src="images/docker/clusternodes.png" alt="集群节点信息"></p>
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