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问主郭宝东 發表於 2024-4-4 00:00:00

用Mac在CoreOS上搭建WordPress的教程

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作者以自己的Mac笔记本为例，介绍了如何在CoreOS上安装WordPress应用，没有过多的理论解释，全部是实战类教程，推荐想快速了解CoreOS的同学阅读。</p>
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我相信你一定听说过CoreOS，但是你是否真正在它上面部署过一个应用了？可能很多人都没有部署过。在CoreOS上构建一个应用是非常困难且令人沮丧的（译者注：frustrating，用了这个词，看来确实难）。因为文档比较散乱，并且你不得不在开始之前学习所有相关的技术，包括etcd、systemd、Docker。如果你和我一样比较懒惰，只是想试试CoreOS而不想小题大做，那么让我来帮你吧。接下来我们将会在CoreOS上创建一个简单的WordPress应用以及MySQL数据库。<br><strong>如果你使用的是Mac，可以通过安装命令行工具来控制CoreOS</strong></p>
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<img style="max-width:100%!important;height:auto!important;"title="用Mac在CoreOS上搭建WordPress的教程" alt="用Mac在CoreOS上搭建WordPress的教程" src="https://zhuji.jb51.net/uploads/img/202305/6d083673e09c30a1198df264b91fffc1.jpg"></p>
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fleetctl 和 etcdctl 是原生的控制CoreOS集群的工具，安装步骤如下：</p>
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<span><u>复制代码</u></span>
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代码如下:</div>
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$ brew install go etcdctl <br>
$ git clone https://github.com/coreos/fleet.git<br>
$ cd fleet<br>
$ ./build<br>
$ mv bin/fleetctl /usr/local/bin/</div>
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<strong>安装一个本地的CoreOS集群，并运行</strong></p>
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Vagrant是非常简单的。</p>
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<span><u>复制代码</u></span>
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代码如下:</div>
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$ git clone https://github.com/CenturyLinkLabs/coreos-vagrant <br>
$ cd coreos-vagrant/cluster<br>
$ vagrant up --provision</div>
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现在你的笔记本上有一个由最小的3个CoreOS系统组成的集群。简单极了，现在让我们使用fleetctl来检查下。</p>
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<span><u>复制代码</u></span>
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代码如下:</div>
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$ fleetctl list-machines MACHINE IP METADATA<br>
09fd0a88... 10.0.2.15 -<br>
77763947... 10.0.2.15 -<br>
f31c383c... 10.0.2.15 -</div>
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太棒了，跑起来了。<br><strong>使用fleet在CoreOS集群上部署应用</strong></p>
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现在你有一个CoreOS集群了。接下来fleetctl命令可以让你在CoreOS集群节点上部署应用，但要用fleet写服务文件。当然，不需要你自己来写。你可以用简单的YAML格式来生成服务（service）文件。</p>
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<span><u>复制代码</u></span>
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代码如下:</div>
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$ sudo gem install bundler fig2coreos<br>
$ cat fig.yml</p> <p>-</p> <p> web:<br>
image: ctlc/wordpress<br>
ports:<br>
- 80:80<br>
environment:<br>
DB_USER: root<br>
DB_PASSWORD: qa1N76pWAri9<br>
links:<br>
- db<br>
db:<br>
image: ctlc/mysql<br>
ports:<br>
- 3306:3306<br>
environment:<br>
MYSQL_DATABASE: wordpress<br>
MYSQL_ROOT_PASSWORD: qa1N76pWAri9</p> <p>-</p> <p> $ fig2coreos myapp fig.yml coreos-files<br>
$ cd coreos-files<br>
$ ls<br>
db-discovery.1.service<br>
db.1.service<br>
web-discovery.1.service<br>
web.1.service</div>
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fleetctl客户端工具使用etcd的键值存储来确定它要访问的服务器以及访问集群中有etcd服务端运行的服务器。下面是如何在CoreOS集群中部署你的应用。</p>
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<span><u>复制代码</u></span>
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代码如下:</div>
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$ fleetctl start db.1.service<br>
$ fleetctl list-units<br>
UNIT LOAD ACTIVE SUB DESC MACHINE<br>
db.1.service loaded active running Run db_1 9c008961.../10.0.2.15<br>
$ fleetctl start web.1.service<br>
$ fleetctl list-units<br>
UNIT LOAD ACTIVE SUB DESC MACHINE<br>
db.1.service loaded active running Run db_1 9c008961.../10.0.2.15<br>
web.1.service loaded active running Run web_1 9c008961.../10.0.2.15</div>
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现在你的程序运行起来了，但是服务还没有注册到etcd。幸运的是，fig2coreos已经为我们自动生成服务文件。</p>
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<span><u>复制代码</u></span>
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代码如下:</div>
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$ fleetctl start db-discovery.1.service<br>
$ fleetctl start web-discovery.1.service<br>
$ fleetctl list-units<br>
UNIT LOAD ACTIVE SUB DESC MACHINE<br>
db-discovery.1.service loaded active running Announce db_1 9c008961.../10.0.2.15<br>
db.1.service loaded active running Run db_1 9c008961.../10.0.2.15<br>
web-discovery.1.service loaded active running Announce web_1 9c008961.../10.0.2.15<br>
web.1.service loaded active running Run web_1 9c008961.../10.0.2.15<br>
$ etcdctl ls --recursive<br>
/services<br>
/services/web<br>
/services/web/web_1<br>
/services/db<br>
/services/db/db_1<br>
$ etcdctl get /services/web/web_1<br>
{ "host": "core-03", "port": 80, "version": "52c7248a14" }<br>
$ etcdctl get /services/db/db_1<br>
{ "host": "core-03", "port": 3306, "version": "52c7248a14" }</div>
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<strong>部署完成</strong></p>
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就这样，搞定了。在Vagrant 1.5使用Vagrant Cloud账号，你可以访问你的WordPress应用。如下图:</p>
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<span><u>复制代码</u></span>
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代码如下:</div>
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$ cd ~/coreos-vagrant/cluster/</div>
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找出哪个机器监听着你的80端口：</p>
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<span><u>复制代码</u></span>
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代码如下:</div>
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$ etcdctl get /services/web/web_1<br>
{ "host": "core-03", "port": 80, "version": "52c7248a14" }</p> <p>$ vagrant share core-03 --http 80<br>
==> core-03: Detecting network information for machine...<br>
core-03: Local machine address: 192.168.65.2<br>
core-03: Local HTTP port: 80<br>
core-03: Local HTTPS port: disabled<br>
==> core-03: Checking authentication and authorization...<br>
==> core-03: Creating Vagrant Share session...<br>
core-03: Share will be at: quick-iguana-4689<br>
==> core-03: Your Vagrant Share is running! Name: quick-iguana-4689<br>
==> core-03: URL: http://quick-iguana-4689.vagrantshare.com</div>
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<img style="max-width:100%!important;height:auto!important;"title="用Mac在CoreOS上搭建WordPress的教程" alt="用Mac在CoreOS上搭建WordPress的教程" src="https://zhuji.jb51.net/uploads/img/202305/88fb610fc1e50c6110f6e9af927902b5.jpg"></p>

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