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<title> [筆記] 詭異的client&amp;server間連線的問題，或許跟KVM有關係？ | MC部落</title>
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<h3><a href="/post/weird-client-server-connection/">[筆記] 詭異的client&amp;server間連線的問題，或許跟KVM有關係？</a></h3>
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<span class="date moment">2018-11-08</span>
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<span class="author"><a href="/author/eric-chang">Eric Chang</a></span>
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<p>這是發生在一個夜黑風高的寂寥深夜&hellip;.. ( What The FXXX &hellip; )</p>
<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>
<p>在每個分公司，都會有一台伺服器作為KVM Host</p>
<p>上面跑兩台VM，一台作為ansible controller (目前沒作用)</p>
<p>另一台作為這邊所謂的 &ldquo;Build Server&rdquo;</p>
<p>用途包含了DHCP Server / Proxy Server (squid3) / APT Proxy (squid-deb-proxy)</p>
<p>問題就發生在這台 Build Server 上&hellip;</p>
<p></p>
<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>
<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>
<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>
<pre><code>acl localnet src 192.168.28.0/24
acl allowhost src &quot;/etc/squid3/allowhost.txt&quot;
acl localdomain dstdomain &quot;/etc/squid3/localdomain.txt&quot;
acl SSL_ports port 443
acl Safe_ports port 80 # http
acl Safe_ports port 21 # ftp
acl Safe_ports port 443 # https
acl Safe_ports port 70 # gopher
acl Safe_ports port 210 # wais
acl Safe_ports port 1025-65535 # unregistered ports
acl Safe_ports port 280 # http-mgmt
acl Safe_ports port 488 # gss-http
acl Safe_ports port 591 # filemaker
acl Safe_ports port 777 # multiling http
acl CONNECT method CONNECT
</code></pre>
<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>
<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>
<p>但如果這樣的話，那就一點也不詭異了呀(攤手)</p>
<p>實際上的狀況是，只有反應的USER的電腦無法連接Internet</p>
<p>然後真的詭異的來了</p>
<p>用USER電腦去 ping proxy server ，有時候會通，有時候不通..</p>
<p>從Proxy Server去 ping USER電腦，也是類似的狀況</p>
<p>可是我卻可以透過IPSEC VPN，分別SSH連接到這兩台機器上</p>
<p>這代表兩台的網路都OK呀..</p>
<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>
<p>變成可以 ping proxy Server 了！ (What the FXXX !!!!)</p>
<p>我什麼都沒改呀&hellip;</p>
<hr>
<p>反正呢&hellip;</p>
<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>
<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>
<p>然後呢，因為底層是 KVM</p>
<p>我也嘗試過用virsh 去restart VM 或者是 restart network</p>
<p>有時候可以解決，有時候又還是不能連接</p>
<p>於是另外測試安裝了 proxmox VE 的虛擬平台</p>
<p>在上面起一台新的Server，再用 ansible 做成 build server的角色</p>
<p>這樣子作的機器，就不會發生這種狀況</p>
<p>所以我在猜是不是跟底層是KVM有關係..</p>
<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>
<p>暫時先保留這個作法，等到下次再發生這狀況</p>
<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&hellip;</p>
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