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<a class="featured-image-link" href="https://h.cowbay.org/post/ubuntu-letsencrypt-cloudflare-wildcard/"><div class='featured-image lazy lazy-bg-image' data-background="https://h.cowbay.org/images/post-default-4.jpg"></div></a>
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<span class="date">02 September</span>
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<span class="author">
<a href="https://github.com/changchichung" title="Posts by Eric Chang" rel="author">Eric Chang</a>
</span>
<span> / </span>
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<a href="https://h.cowbay.org/post/ubuntu-letsencrypt-cloudflare-wildcard/ "> [筆記] 在 ubuntu 20.04 底下用certbot 透過Cloudflare 申請全域的 Letsencrypt 憑證 </a>
</h2>
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<div class='excerpt-content'>
<article>
<p>之前用caddy 作為反向代理其中一個優勢就是caddy 會自動處理Letsencrypt 憑證的問題</p>
<p>也不用煩惱怎麼去更新一堆有的沒的</p>
<p>不過,實際應用上,還是偶爾會拿這些憑證檔案來用的狀況</p>
<p>雖然可以從caddy 上面取得這些檔案</p>
<p>但是基本上這些檔案都是綁定一個特定的hostname</p>
<p>可是我想要有一個憑證,可以給同網域底下的機器用 ( Wildcard certificates )</p>
<div class="more-link-wrapper"><a class="more-link" href="https://h.cowbay.org/post/ubuntu-letsencrypt-cloudflare-wildcard/">Read the post<span class="screen-reader-text">This is a Standard Post</span></a></div>
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<a class="featured-image-link" href="https://h.cowbay.org/post/wireguard-pihole-in-ubuntu-20.04/"><div class='featured-image lazy lazy-bg-image' data-background="https://h.cowbay.org/images/post-default-16.jpg"></div></a>
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<span class="date">13 August</span>
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<span class="author">
<a href="https://github.com/changchichung" title="Posts by Eric Chang" rel="author">Eric Chang</a>
</span>
<span> / </span>
<span class="category">
<a href="/categories/%E7%AD%86%E8%A8%98">筆記</a>
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<h2 class='excerpt-title'>
<a href="https://h.cowbay.org/post/wireguard-pihole-in-ubuntu-20.04/ "> [筆記] 在 ubuntu 20.04 上安裝 wireguard &#43; pihole 作 AD Blocking/install wireguard and pihole to do ad block in ubuntu 20.04 </a>
</h2>
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<article>
<p>手機上的廣告越來越討厭了</p>
<p>但是用手機看頁面、影片的機會越來越高</p>
<p>所以一直想看看有沒有什麼方式可以解決這個問題</p>
<p>不只可以用在safari 上連APP 裡面的廣告最好都能夠擋掉</p>
<p>在github上面看到有個專案是 wireguard + pihole</p>
<p>滿有趣的,就來研究一下</p>
<div class="more-link-wrapper"><a class="more-link" href="https://h.cowbay.org/post/wireguard-pihole-in-ubuntu-20.04/">Read the post<span class="screen-reader-text">This is a Standard Post</span></a></div>
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<a class="featured-image-link" href="https://h.cowbay.org/post/check-port-speed-in-openwrt/"><div class='featured-image lazy lazy-bg-image' data-background="https://h.cowbay.org/images/post-default-10.jpg"></div></a>
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<span class="date">15 July</span>
<span> / </span>
<span class="author">
<a href="https://github.com/changchichung" title="Posts by Eric Chang" rel="author">Eric Chang</a>
</span>
<span> / </span>
<span class="category">
<a href="/categories/%E7%AD%86%E8%A8%98">筆記</a>
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<div class='excerpt-header'>
<h2 class='excerpt-title'>
<a href="https://h.cowbay.org/post/check-port-speed-in-openwrt/ "> [筆記] 在openwrt 中檢查網路埠的連接速度/ Check Port Speed in Openwrt </a>
</h2>
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<article>
<p>最近在玩ansible + openwrt + wireguard</p>
<p>ansible 腳本寫好之後可以把config 佈署到 openwrt 上</p>
<p>當然前提是最好用同樣的機器不同的機器在config 上會有一些差異</p>
<p>但是這些差異常常就會造成無法連線、無法使用的狀況</p>
<p>BTW 我是用 ubiquiti 的 edgerouter X 來做</p>
<p>都弄好之後就想說來跑個iperf3 測試一下連線速度</p>
<p>也好和之前做的 IPSEC 比較一下</p>
<p>結果很奇怪的是明明一樣的機器、一樣用ansible 跑出來的config</p>
<p>但是有一台edgerouter X 的VPN 連接速度就是特別慢</p>
<p>而且速度都剛好卡在 99.X Mb 左右</p>
<p>就讓我很納悶了&hellip;</p>
<div class="more-link-wrapper"><a class="more-link" href="https://h.cowbay.org/post/check-port-speed-in-openwrt/">Read the post<span class="screen-reader-text">This is a Standard Post</span></a></div>
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<a class="featured-image-link" href="https://h.cowbay.org/post/debian-buster-server-been-hacked/"><div class='featured-image lazy lazy-bg-image' data-background="https://h.cowbay.org/images/post-default-14.jpg"></div></a>
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<div class="excerpt-meta">
<span class="date">10 July</span>
<span> / </span>
<span class="author">
<a href="https://github.com/changchichung" title="Posts by Eric Chang" rel="author">Eric Chang</a>
</span>
<span> / </span>
<span class="category">
<a href="/categories/%E7%AD%86%E8%A8%98">筆記</a>
</span>
</div>
<div class='excerpt-header'>
<h2 class='excerpt-title'>
<a href="https://h.cowbay.org/post/debian-buster-server-been-hacked/ "> [筆記] Debian Buster 伺服器被入侵了!/ Debian Buster Server Been Hacked </a>
</h2>
</div>
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<article>
<p>上禮拜某天在開會的時候LINE不斷傳來訊息</p>
<p>不過因為我向來開會都很認真(驕傲,所以都沒看,接著就變成來電了</p>
<p>看來大概有啥事發生</p>
<p>不過畢竟不是正職的工作,就先放著吧</p>
<p>後來變成連學長都直接打來告訴我,某間公司的伺服器出事了,客戶找不到我</p>
<p>叫我趕快連進去看</p>
<p>是說,啊我又沒跟人家簽維護,趕什麼趕&hellip;</p>
<p>總之,開完會後就了解一下狀況</p>
<div class="more-link-wrapper"><a class="more-link" href="https://h.cowbay.org/post/debian-buster-server-been-hacked/">Read the post<span class="screen-reader-text">This is a Standard Post</span></a></div>
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<a class="featured-image-link" href="https://h.cowbay.org/post/ubuntu-kernel-4-15-0-106-unable-to-start-wireguard-interface/"><div class='featured-image lazy lazy-bg-image' data-background="https://h.cowbay.org/images/post-default-16.jpg"></div></a>
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<span class="date">22 June</span>
<span> / </span>
<span class="author">
<a href="https://github.com/changchichung" title="Posts by Eric Chang" rel="author">Eric Chang</a>
</span>
<span> / </span>
<span class="category">
<a href="/categories/%E7%AD%86%E8%A8%98">筆記</a>
</span>
</div>
<div class='excerpt-header'>
<h2 class='excerpt-title'>
<a href="https://h.cowbay.org/post/ubuntu-kernel-4-15-0-106-unable-to-start-wireguard-interface/ "> Ubuntu 18.04 Kernel 4.15.0-106 Unable to Start Wireguard Interface </a>
</h2>
</div>
<div class='excerpt-content'>
<article>
<p>工作用的電腦昨天終於難得的reboot了(uptime 看了一下,大概是三百多天)</p>
<p>結果重開機之後發現原本在打tunnel 連 ptt 的 wireguard VPN 掛掉了</p>
<p>手動下指令也啟動不了</p>
<p>查了一下發現是 ubuntu 18.04 kernel 4.15.0-106 的包</p>
<p>看來就連kernel 最好都不要自動升級&hellip;</p>
<div class="more-link-wrapper"><a class="more-link" href="https://h.cowbay.org/post/ubuntu-kernel-4-15-0-106-unable-to-start-wireguard-interface/">Read the post<span class="screen-reader-text">This is a Standard Post</span></a></div>
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