參考網(wǎng)址：https://blog.csdn.net/qq_24630433/article/details/87478163

今天發(fā)現(xiàn)用xshell連接centos太慢逢并，網(wǎng)上查詢后發(fā)現(xiàn)是因為在使用shell連接虛擬機(jī)時連接等待時長太長，ssh的服務(wù)端在連接時會自動檢測dns環(huán)境是否一致導(dǎo)致的揩徊，修改為不檢測即可帅刊。

第一步：輸入命令

<pre spellcheck="false" class="md-fences md-end-block ty-contain-cm modeLoaded" lang="shell" cid="n5" mdtype="fences" style="box-sizing: border-box; overflow: visible; font-family: var(--monospace); font-size: 0.9em; display: block; break-inside: avoid; text-align: left; white-space: normal; background-image: inherit; background-position: inherit; background-size: inherit; background-repeat: inherit; background-attachment: inherit; background-origin: inherit; background-clip: inherit; background-color: rgb(248, 248, 248); position: relative !important; border: 1px solid rgb(231, 234, 237); border-radius: 3px; padding: 8px 4px 6px; margin-bottom: 15px; margin-top: 15px; width: inherit; color: rgb(51, 51, 51); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">vi /etc/ssh/sshd_config</pre>

image-20210314233223671

第二步：修改配置

把UseDNS yes,改為UseDNS no

image-20210314233109122

第三步：重啟SSHD服務(wù)

<pre spellcheck="false" class="md-fences md-end-block ty-contain-cm modeLoaded" lang="shell" cid="n11" mdtype="fences" style="box-sizing: border-box; overflow: visible; font-family: var(--monospace); font-size: 0.9em; display: block; break-inside: avoid; text-align: left; white-space: normal; background-image: inherit; background-position: inherit; background-size: inherit; background-repeat: inherit; background-attachment: inherit; background-origin: inherit; background-clip: inherit; background-color: rgb(248, 248, 248); position: relative !important; border: 1px solid rgb(231, 234, 237); border-radius: 3px; padding: 8px 4px 6px; margin-bottom: 15px; margin-top: 15px; width: inherit; color: rgb(51, 51, 51); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">systemctl restart sshd</pre>