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<a class="article-title" href="/2019/02/28/confd中文文档/">confd中文文档</a>
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<h1 id="快速入门"><a href="#快速入门" class="headerlink" title="快速入门"></a>快速入门</h1><p>开始之前请确认 <a href="https://github.com/kelseyhightower/confd/blob/master/docs/installation.md" target="_blank" rel="noopener">下载并安装了confd</a>.</p>
<h2 id="选择一个后端"><a href="#选择一个后端" class="headerlink" title="选择一个后端"></a>选择一个后端</h2><p>confd支持以下后端:</p>
<ul>
<li>etcd</li>
<li>consul</li>
<li>vault</li>
<li>环境变量</li>
<li>文件</li>
<li>redis</li>
<li>zookeeper</li>
<li>dynamodb</li>
<li>rancher</li>
<li>ssm (AWS Simple Systems Manager Parameter Store)</li>
</ul>
<h3 id="添加keys"><a href="#添加keys" class="headerlink" title="添加keys"></a>添加keys</h3><p>本教程假设你已经拥有了可以工作的 <a href="https://github.com/coreos/etcd#getting-started" target="_blank" rel="noopener">etcd</a>, 或者 <a href="http://www.consul.io/intro/getting-started/install.html" target="_blank" rel="noopener">consul</a> 服务启动并且运行中，并且可以添加新的keys。</p>
<h4 id="etcd"><a href="#etcd" class="headerlink" title="etcd"></a>etcd</h4><figure class="highlight plain"><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">etcdctl set /myapp/database/url db.example.com</span><br><span class="line">etcdctl set /myapp/database/user rob</span><br></pre></td></tr></table></figure>
<h4 id="consul"><a href="#consul" class="headerlink" title="consul"></a>consul</h4><figure class="highlight plain"><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">curl -X PUT -d 'db.example.com' http://localhost:8500/v1/kv/myapp/database/url</span><br><span class="line">curl -X PUT -d 'rob' http://localhost:8500/v1/kv/myapp/database/user</span><br></pre></td></tr></table></figure>
<h4 id="vault"><a href="#vault" class="headerlink" title="vault"></a>vault</h4><figure class="highlight plain"><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">vault mount -path myapp generic</span><br><span class="line">vault write myapp/database url=db.example.com user=rob</span><br></pre></td></tr></table></figure>
<h4 id="环境变量"><a href="#环境变量" class="headerlink" title="环境变量"></a>环境变量</h4><figure class="highlight plain"><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">export MYAPP_DATABASE_URL=db.example.com</span><br><span class="line">export MYAPP_DATABASE_USER=rob</span><br></pre></td></tr></table></figure>
<h4 id="文件"><a href="#文件" class="headerlink" title="文件"></a>文件</h4><p>myapp.yaml<br><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></pre></td><td class="code"><pre><span class="line">myapp:</span><br><span class="line"> database:</span><br><span class="line"> url: db.example.com</span><br><span class="line"> user: rob</span><br></pre></td></tr></table></figure></p>
<h4 id="redis"><a href="#redis" class="headerlink" title="redis"></a>redis</h4><figure class="highlight plain"><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">redis-cli set /myapp/database/url db.example.com</span><br><span class="line">redis-cli set /myapp/database/user rob</span><br></pre></td></tr></table></figure>
<h4 id="zookeeper"><a href="#zookeeper" class="headerlink" title="zookeeper"></a>zookeeper</h4><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></pre></td><td class="code"><pre><span class="line">[zk: localhost:2181(CONNECTED) 1] create /myapp ""</span><br><span class="line">[zk: localhost:2181(CONNECTED) 2] create /myapp/database ""</span><br><span class="line">[zk: localhost:2181(CONNECTED) 3] create /myapp/database/url "db.example.com"</span><br><span class="line">[zk: localhost:2181(CONNECTED) 4] create /myapp/database/user "rob"</span><br></pre></td></tr></table></figure>
<h4 id="dynamodb"><a href="#dynamodb" class="headerlink" title="dynamodb"></a>dynamodb</h4><p>首先创建一个table通过以下方式:</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></pre></td><td class="code"><pre><span class="line">aws dynamodb create-table \</span><br><span class="line"> --region <YOUR_REGION> --table-name <YOUR_TABLE> \</span><br><span class="line"> --attribute-definitions AttributeName=key,AttributeType=S \</span><br><span class="line"> --key-schema AttributeName=key,KeyType=HASH \</span><br><span class="line"> --provisioned-throughput ReadCapacityUnits=1,WriteCapacityUnits=1</span><br></pre></td></tr></table></figure>
<p>现在创建items. <code>value</code>的属性的类型必须是 <a href="http://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_AttributeValue.html" target="_blank" rel="noopener">string</a>:</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></pre></td><td class="code"><pre><span class="line">aws dynamodb put-item --table-name <YOUR_TABLE> --region <YOUR_REGION> \</span><br><span class="line"> --item '{ "key": { "S": "/myapp/database/url" }, "value": {"S": "db.example.com"}}'</span><br><span class="line">aws dynamodb put-item --table-name <YOUR_TABLE> --region <YOUR_REGION> \</span><br><span class="line"> --item '{ "key": { "S": "/myapp/database/user" }, "value": {"S": "rob"}}'</span><br></pre></td></tr></table></figure>
<h4 id="Rancher"><a href="#Rancher" class="headerlink" title="Rancher"></a>Rancher</h4><p>This backend consumes the <a href="https://www.rancher.com" target="_blank" rel="noopener">Rancher</a> metadata service. For available keys, see the <a href="http://docs.rancher.com/rancher/rancher-services/metadata-service/" target="_blank" rel="noopener">Rancher Metadata Service docs</a>.</p>
<h4 id="ssm"><a href="#ssm" class="headerlink" title="ssm"></a>ssm</h4><figure class="highlight plain"><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">aws ssm put-parameter --name "/myapp/database/url" --type "String" --value "db.example.com"</span><br><span class="line">aws ssm put-parameter --name "/myapp/database/user" --type "SecureString" --value "rob"</span><br></pre></td></tr></table></figure>
<h3 id="创建配置目录"><a href="#创建配置目录" class="headerlink" title="创建配置目录"></a>创建配置目录</h3><p>配置目录存放模板资源配置(confdir)和模板(templates)的地方.</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">sudo mkdir -p /etc/confd/{conf.d,templates}</span><br></pre></td></tr></table></figure>
<h3 id="创建一个模板资源配置"><a href="#创建一个模板资源配置" class="headerlink" title="创建一个模板资源配置"></a>创建一个模板资源配置</h3><p>模板资源被配置在<a href="https://github.com/mojombo/toml" target="_blank" rel="noopener">TOML</a>配置文件中，存放在<code>confdir</code>.</p>
<p>/etc/confd/conf.d/myconfig.toml<br><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></pre></td><td class="code"><pre><span class="line">[template]</span><br><span class="line">src = "myconfig.conf.tmpl"</span><br><span class="line">dest = "/tmp/myconfig.conf"</span><br><span class="line">keys = [</span><br><span class="line"> "/myapp/database/url",</span><br><span class="line"> "/myapp/database/user",</span><br><span class="line">]</span><br></pre></td></tr></table></figure></p>
<h3 id="创建源模板"><a href="#创建源模板" class="headerlink" title="创建源模板"></a>创建源模板</h3><p>源模板格式为<a href="http://golang.org/pkg/text/template/#pkg-overview" target="_blank" rel="noopener">Golang text templates</a>.</p>
<p>/etc/confd/templates/myconfig.conf.tmpl<br><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></pre></td><td class="code"><pre><span class="line">[myconfig]</span><br><span class="line">database_url = {{getv "/myapp/database/url"}}</span><br><span class="line">database_user = {{getv "/myapp/database/user"}}</span><br></pre></td></tr></table></figure></p>
<h3 id="执行模板"><a href="#执行模板" class="headerlink" title="执行模板"></a>执行模板</h3><p>confd支持两种操作模式：daemon和一次性执行.<br>在daemon模式中confd监视后端存储中的变化，检测到变化后进行配置文件的更新。</p>
<h4 id="etcd-1"><a href="#etcd-1" class="headerlink" title="etcd"></a>etcd</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">confd -onetime -backend etcd -node http://127.0.0.1:2379</span><br></pre></td></tr></table></figure>
<h4 id="consul-1"><a href="#consul-1" class="headerlink" title="consul"></a>consul</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">confd -onetime -backend consul -node 127.0.0.1:8500</span><br></pre></td></tr></table></figure>
<h4 id="vault-1"><a href="#vault-1" class="headerlink" title="vault"></a>vault</h4><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></pre></td><td class="code"><pre><span class="line">ROOT_TOKEN=$(vault read -field id auth/token/lookup-self)</span><br><span class="line"></span><br><span class="line">confd -onetime -backend vault -node http://127.0.0.1:8200 \</span><br><span class="line"> -auth-type token -auth-token $ROOT_TOKEN</span><br></pre></td></tr></table></figure>
<h4 id="dynamodb-1"><a href="#dynamodb-1" class="headerlink" title="dynamodb"></a>dynamodb</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">confd -onetime -backend dynamodb -table <YOUR_TABLE></span><br></pre></td></tr></table></figure>
<h4 id="env"><a href="#env" class="headerlink" title="env"></a>env</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">confd -onetime -backend env</span><br></pre></td></tr></table></figure>
<h4 id="file"><a href="#file" class="headerlink" title="file"></a>file</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">confd -onetime -backend file -file myapp.yaml</span><br></pre></td></tr></table></figure>
<h4 id="redis-1"><a href="#redis-1" class="headerlink" title="redis"></a>redis</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">confd -onetime -backend redis -node 192.168.255.210:6379</span><br></pre></td></tr></table></figure>
<p>或者想指定明确的redis index (示例中指定index4):</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">confd -onetime -backend redis -node 192.168.255.210:6379/4</span><br></pre></td></tr></table></figure>
<h4 id="rancher"><a href="#rancher" class="headerlink" title="rancher"></a>rancher</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">confd -onetime -backend rancher -prefix /2015-07-25</span><br></pre></td></tr></table></figure>
<p><em>Note</em>: The metadata api prefix can be defined on the cli, or as part of your keys in the template toml file.</p>
<p>Output:<br><figure class="highlight plain"><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">2014-07-08T20:38:36-07:00 confd[16252]: INFO Target config /tmp/myconfig.conf out of sync</span><br><span class="line">2014-07-08T20:38:36-07:00 confd[16252]: INFO Target config /tmp/myconfig.conf has been updated</span><br></pre></td></tr></table></figure></p>
<p>The <code>dest</code> configuration file should now be in sync.</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">cat /tmp/myconfig.conf</span><br></pre></td></tr></table></figure>
<p>Output:<br><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></pre></td><td class="code"><pre><span class="line"># This a comment</span><br><span class="line">[myconfig]</span><br><span class="line">database_url = db.example.com</span><br><span class="line">database_user = rob</span><br></pre></td></tr></table></figure></p>
<h4 id="ssm-1"><a href="#ssm-1" class="headerlink" title="ssm"></a>ssm</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">confd -onetime -backend ssm</span><br></pre></td></tr></table></figure>
<h2 id="高级示例"><a href="#高级示例" class="headerlink" title="高级示例"></a>高级示例</h2><p>在该示例中，我们会使用confd通过单一的模板来管理两个nginx配置</p>
<h3 id="添加keys-1"><a href="#添加keys-1" class="headerlink" title="添加keys"></a>添加keys</h3><h4 id="etcd-2"><a href="#etcd-2" class="headerlink" title="etcd"></a>etcd</h4><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></pre></td><td class="code"><pre><span class="line">etcdctl set /myapp/subdomain myapp</span><br><span class="line">etcdctl set /myapp/upstream/app2 "10.0.1.100:80"</span><br><span class="line">etcdctl set /myapp/upstream/app1 "10.0.1.101:80"</span><br><span class="line">etcdctl set /yourapp/subdomain yourapp</span><br><span class="line">etcdctl set /yourapp/upstream/app2 "10.0.1.102:80"</span><br><span class="line">etcdctl set /yourapp/upstream/app1 "10.0.1.103:80"</span><br></pre></td></tr></table></figure>
<h4 id="consul-2"><a href="#consul-2" class="headerlink" title="consul"></a>consul</h4><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></pre></td><td class="code"><pre><span class="line">curl -X PUT -d 'myapp' http://localhost:8500/v1/kv/myapp/subdomain</span><br><span class="line">curl -X PUT -d '10.0.1.100:80' http://localhost:8500/v1/kv/myapp/upstream/app1</span><br><span class="line">curl -X PUT -d '10.0.1.101:80' http://localhost:8500/v1/kv/myapp/upstream/app2</span><br><span class="line">curl -X PUT -d 'yourapp' http://localhost:8500/v1/kv/yourapp/subdomain</span><br><span class="line">curl -X PUT -d '10.0.1.102:80' http://localhost:8500/v1/kv/yourapp/upstream/app1</span><br><span class="line">curl -X PUT -d '10.0.1.103:80' http://localhost:8500/v1/kv/yourapp/upstream/app2</span><br></pre></td></tr></table></figure>
<h3 id="创建模板配置文件"><a href="#创建模板配置文件" class="headerlink" title="创建模板配置文件"></a>创建模板配置文件</h3><p>/etc/confd/conf.d/myapp-nginx.toml</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></pre></td><td class="code"><pre><span class="line">[template]</span><br><span class="line">prefix = "/myapp"</span><br><span class="line">src = "nginx.tmpl"</span><br><span class="line">dest = "/tmp/myapp.conf"</span><br><span class="line">owner = "nginx"</span><br><span class="line">mode = "0644"</span><br><span class="line">keys = [</span><br><span class="line"> "/subdomain",</span><br><span class="line"> "/upstream",</span><br><span class="line">]</span><br><span class="line">check_cmd = "/usr/sbin/nginx -t -c {{.src}}"</span><br><span class="line">reload_cmd = "/usr/sbin/service nginx reload"</span><br></pre></td></tr></table></figure>
<p>/etc/confd/conf.d/yourapp-nginx.toml</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></pre></td><td class="code"><pre><span class="line">[template]</span><br><span class="line">prefix = "/yourapp"</span><br><span class="line">src = "nginx.tmpl"</span><br><span class="line">dest = "/tmp/yourapp.conf"</span><br><span class="line">owner = "nginx"</span><br><span class="line">mode = "0644"</span><br><span class="line">keys = [</span><br><span class="line"> "/subdomain",</span><br><span class="line"> "/upstream",</span><br><span class="line">]</span><br><span class="line">check_cmd = "/usr/sbin/nginx -t -c {{.src}}"</span><br><span class="line">reload_cmd = "/usr/sbin/service nginx reload"</span><br></pre></td></tr></table></figure>
<h3 id="创建模板"><a href="#创建模板" class="headerlink" title="创建模板"></a>创建模板</h3><p>/etc/confd/templates/nginx.tmpl<br><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></pre></td><td class="code"><pre><span class="line">upstream {{getv "/subdomain"}} {</span><br><span class="line">{{range getvs "/upstream/*"}}</span><br><span class="line"> server {{.}};</span><br><span class="line">{{end}}</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">server {</span><br><span class="line"> server_name {{getv "/subdomain"}}.example.com;</span><br><span class="line"> location / {</span><br><span class="line"> proxy_pass http://{{getv "/subdomain"}};</span><br><span class="line"> proxy_redirect off;</span><br><span class="line"> proxy_set_header Host $host;</span><br><span class="line"> proxy_set_header X-Real-IP $remote_addr;</span><br><span class="line"> proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
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