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"name" : "[筆記] 詭異的client\x26server間連線的問題，或許跟KVM有關係？",
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<title>[筆記] 詭異的client&server間連線的問題，或許跟KVM有關係？ </title>
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<span class="date">08 November</span> <span> / </span>
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<a href="https://github.com/changchichung" title="Posts by Eric Chang" rel="author">Eric Chang</a>
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<a href="/categories/%E7%AD%86%E8%A8%98">筆記</a>
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<div class='entry-header'>
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<h1 class='entry-title'> [筆記] 詭異的client&server間連線的問題，或許跟KVM有關係？</h1>
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</div>
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<div class="entry-container">
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<div class="entry-content">
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<article>
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<p>這是發生在一個夜黑風高的寂寥深夜….. ( What The FXXX … )</p>
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<p>來到這個環境之後，有一個很詭異的狀況一直困擾著我</p>
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<p>在每個分公司，都會有一台伺服器作為KVM Host</p>
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<p>上面跑兩台VM，一台作為ansible controller (目前沒作用)</p>
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<p>另一台作為這邊所謂的 “Build Server”</p>
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<p>用途包含了DHCP Server / Proxy Server (squid3) / APT Proxy (squid-deb-proxy)</p>
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<p>問題就發生在這台 Build Server 上…</p>
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<p>有陣子花了點時間去檢查各個分公司的網路環境，確保每一台Build Server都能夠連接Internet</p>
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<p>然後找了一個離總部最近的據點，把這些電腦連接Internet 的方式改為用 proxy 來控制</p>
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<p>在proxy內加入了 allowhost 的設定，然後把user電腦上的瀏覽器都代入 proxy server (firefox/chrome 的設定方式不同)</p>
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<pre><code>acl localnet src 192.168.28.0/24
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acl allowhost src "/etc/squid3/allowhost.txt"
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acl localdomain dstdomain "/etc/squid3/localdomain.txt"
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acl SSL_ports port 443
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acl Safe_ports port 80 # http
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acl Safe_ports port 21 # ftp
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acl Safe_ports port 443 # https
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acl Safe_ports port 70 # gopher
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acl Safe_ports port 210 # wais
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acl Safe_ports port 1025-65535 # unregistered ports
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acl Safe_ports port 280 # http-mgmt
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acl Safe_ports port 488 # gss-http
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acl Safe_ports port 591 # filemaker
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acl Safe_ports port 777 # multiling http
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acl CONNECT method CONNECT
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</code></pre>
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<p>一開始這樣作還相安無事，但是呢，慢慢的時不時會有USER反應說無法連接 Internet</p>
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<p>照理來說，因為都是透過proxy上網，所以如果是proxy server出問題，那其他電腦應該也不行上Internet</p>
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<p>但如果這樣的話，那就一點也不詭異了呀(攤手)</p>
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<p>實際上的狀況是，只有反應的USER的電腦無法連接Internet</p>
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<p>然後真的詭異的來了</p>
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<p>用USER電腦去 ping proxy server ，有時候會通，有時候不通..</p>
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<p>從Proxy Server去 ping USER電腦，也是類似的狀況</p>
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<p>可是我卻可以透過IPSEC VPN，分別SSH連接到這兩台機器上</p>
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<p>這代表兩台的網路都OK呀..</p>
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<p>正當我百思不得其解的時候，突然 USER電腦那邊的 ping 有反應了</p>
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<p>變成可以 ping proxy Server 了！ (What the FXXX !!!!)</p>
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<p>我什麼都沒改呀…</p>
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<p>update: 2018/11/19</p>
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<p>剛剛在測試一台機器，又發生這個問題</p>
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<p>兩台都ping不到對方</p>
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<p><img src="https://i.imgur.com/gSD086o.png" alt="ping不到" /></p>
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<p>什麼事也沒做，就是把ping中斷，然後再ping 一次，居然就可以了</p>
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<p><img src="https://i.imgur.com/rvtw0hh.png" alt="又ping到了" /></p>
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<p>##真他X的詭異啊！</p>
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<hr>
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<p>反正呢…</p>
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<p>這種狀況三不五時就會出現一次，會出現在哪一台電腦也不一定</p>
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<p>不過，依照觀察到的狀況來說，似乎都是發生在很少開機的電腦上</p>
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<p>然後呢，因為底層是 KVM</p>
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<p>我也嘗試過用virsh 去restart VM 或者是 restart network</p>
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<p>有時候可以解決，有時候又還是不能連接</p>
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<p>於是另外測試安裝了 proxmox VE 的虛擬平台</p>
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<p>在上面起一台新的Server，再用 ansible 做成 build server的角色</p>
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<p>這樣子作的機器，就不會發生這種狀況</p>
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<p>所以我在猜是不是跟底層是KVM有關係..</p>
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<p>不過要動這個的話，工程有點大，手邊也沒那麼多機器可以替換(很慘)</p>
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<p>暫時先保留這個作法，等到下次再發生這狀況</p>
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<p>再來找老闆看這情形，然後來討論要不要換掉各分公司的VM Host…</p>
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</article>
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