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jQuery火箭图标返回顶部代码</h1>
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<p>1）netstat (*****)查看网络状态<span style="color: rgba(255, 0, 0, 1)">lntup</span>或an</p>
<p> <span style="color: rgba(255, 0, 0, 1)"> 1.[listening|-l]</span></p>
<p><span style="color: rgba(255, 0, 0, 1)"> 2.[--numeric|-n]</span></p>
<p><span style="color: rgba(255, 0, 0, 1)"> 3.[--tcp|-t]</span></p>
<p><span style="color: rgba(255, 0, 0, 1)"> 4.[--udp|-u]</span></p>
<p><span style="color: rgba(255, 0, 0, 1)"> 5[--program|-p]</span></p>
<p><span style="color: rgba(255, 0, 0, 1)"> 输入：lntup</span></p>
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<pre><span style="color: rgba(0, 128, 128, 1);user-select:none"> 1</span> 显示协议统计和当前 TCP/<span style="color: rgba(0, 0, 0, 1)">IP 网络连接。
</span><span style="color: rgba(0, 128, 128, 1);user-select:none"> 2</span>
<span style="color: rgba(0, 128, 128, 1);user-select:none"> 3</span> NETSTAT [-a] [-b] [-e] [-f] [-n] [-o] [-p proto] [-r] [-s] [-<span style="color: rgba(0, 0, 0, 1)">t] [interval]
</span><span style="color: rgba(0, 128, 128, 1);user-select:none"> 4</span>
<span style="color: rgba(0, 128, 128, 1);user-select:none"> 5</span> -<span style="color: rgba(0, 0, 0, 1)">a 显示所有连接和侦听端口。
</span><span style="color: rgba(0, 128, 128, 1);user-select:none"> 6</span> -<span style="color: rgba(0, 0, 0, 1)">b 显示在创建每个连接或侦听端口时涉及的可执行程序。
</span><span style="color: rgba(0, 128, 128, 1);user-select:none"> 7</span> <span style="color: rgba(0, 0, 0, 1)"> 在某些情况下，已知可执行程序承载多个独立的
</span><span style="color: rgba(0, 128, 128, 1);user-select:none"> 8</span> <span style="color: rgba(0, 0, 0, 1)"> 组件，这些情况下，显示创建连接或侦听端口时涉
</span><span style="color: rgba(0, 128, 128, 1);user-select:none"> 9</span> <span style="color: rgba(0, 0, 0, 1)"> 及的组件序列。此情况下，可执行程序的名称
</span><span style="color: rgba(0, 128, 128, 1);user-select:none">10</span> <span style="color: rgba(0, 0, 0, 1)"> 位于底部[]中，它调用的组件位于顶部，直至达
</span><span style="color: rgba(0, 128, 128, 1);user-select:none">11</span> 到 TCP/<span style="color: rgba(0, 0, 0, 1)">IP。注意，此选项可能很耗时，并且在您没有
</span><span style="color: rgba(0, 128, 128, 1);user-select:none">12</span> <span style="color: rgba(0, 0, 0, 1)"> 足够权限时可能失败。
</span><span style="color: rgba(0, 128, 128, 1);user-select:none">13</span> -e 显示以太网统计。此选项可以与 -<span style="color: rgba(0, 0, 0, 1)">s 选项结合使用。
</span><span style="color: rgba(0, 128, 128, 1);user-select:none">14</span> -<span style="color: rgba(0, 0, 0, 1)">f 显示外部地址的完全限定域名(FQDN)。
</span><span style="color: rgba(0, 128, 128, 1);user-select:none">15</span> -<span style="color: rgba(0, 0, 0, 1)">n 以数字形式显示地址和端口号。
</span><span style="color: rgba(0, 128, 128, 1);user-select:none">16</span> -<span style="color: rgba(0, 0, 0, 1)">o 显示拥有的与每个连接关联的进程 ID。
</span><span style="color: rgba(0, 128, 128, 1);user-select:none">17</span> -<span style="color: rgba(0, 0, 0, 1)">p proto 显示 proto 指定的协议的连接；proto 可以是下列任
</span><span style="color: rgba(0, 128, 128, 1);user-select:none">18</span> 何一个: TCP、UDP、TCPv6 或 UDPv6。如果与 -<span style="color: rgba(0, 0, 0, 1)">s 选
</span><span style="color: rgba(0, 128, 128, 1);user-select:none">19</span> <span style="color: rgba(0, 0, 0, 1)"> 项一起用来显示每个协议的统计，proto 可以是下列任
</span><span style="color: rgba(0, 128, 128, 1);user-select:none">20</span> <span style="color: rgba(0, 0, 0, 1)"> 何一个: IP、IPv6、ICMP、ICMPv6、TCP、TCPv6、UDP
</span><span style="color: rgba(0, 128, 128, 1);user-select:none">21</span> <span style="color: rgba(0, 0, 0, 1)"> 或 UDPv6。
</span><span style="color: rgba(0, 128, 128, 1);user-select:none">22</span> -<span style="color: rgba(0, 0, 0, 1)">r 显示路由表。
</span><span style="color: rgba(0, 128, 128, 1);user-select:none">23</span> -<span style="color: rgba(0, 0, 0, 1)">s 显示每个协议的统计。默认情况下，显示
</span><span style="color: rgba(0, 128, 128, 1);user-select:none">24</span> <span style="color: rgba(0, 0, 0, 1)"> IP、IPv6、ICMP、ICMPv6、TCP、TCPv6、UDP 和 UDPv6
</span><span style="color: rgba(0, 128, 128, 1);user-select:none">25</span> 的统计；-<span style="color: rgba(0, 0, 0, 1)">p 选项可用于指定默认的子网。
</span><span style="color: rgba(0, 128, 128, 1);user-select:none">26</span> -<span style="color: rgba(0, 0, 0, 1)">t 显示当前连接卸载状态。
</span><span style="color: rgba(0, 128, 128, 1);user-select:none">27</span> <span style="color: rgba(0, 0, 0, 1)"> interval 重新显示选定的统计，各个显示间暂停的间隔秒数。
</span><span style="color: rgba(0, 128, 128, 1);user-select:none">28</span> 按 CTRL+<span style="color: rgba(0, 0, 0, 1)">C 停止重新显示统计。如果省略，则 netstat
</span><span style="color: rgba(0, 128, 128, 1);user-select:none">29</span> 将打印当前的配置信息一次。</pre>
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<p><span style="color: rgba(255, 0, 0, 1)">2)</span><span style="color: rgba(0, 0, 0, 1)">查看端口</span></p>
<p><span style="color: rgba(0, 0, 0, 1)"> lsof-i :port</span></p>
<p><span style="color: rgba(0, 0, 0, 1)"> chattr change file attributess</span></p>
<p><span style="color: rgba(0, 0, 0, 1)"> lksattr list file attributes</span></p>
<p>3)什么是字符集？</p>
<p><span style="color: rgba(0, 0, 0, 1)"> 简单的来说就是一套文字符号以及字符编码，（GBK，UTF-8）</span></p>
<p><span style="color: rgba(0, 0, 0, 1)">4）隐藏系统的版本： </span></p>
<p><span style="color: rgba(0, 0, 0, 1)"> 1.cat /dev/null >/etc/issue</span></p>
<p><span style="color: rgba(0, 0, 0, 1)"> 2.>/etc/issue</span></p>
<p><span style="color: rgba(0, 0, 0, 1)">5)锁定系统文件： </span></p>
<p><span style="color: rgba(0, 0, 0, 1)"> 上锁：chattr +i /etc/passwd /etc/shadow /etc//group /etc/gsadow /etc/inittab</span></p>
<p><span style="color: rgba(0, 0, 0, 1)"> 解锁：chattr -i /etc/passwd /etc/shadow /etc//group /etc/gsadow /etc/inittab</span></p>
<p><span style="color: rgba(0, 0, 0, 1)">6）Linux基础优化</span></p>
<p><span style="color: rgba(0, 0, 0, 1)"> -1.+不同root，添加普通用户，通过sudo授权管理</span></p>
<p><span style="color: rgba(0, 0, 0, 1)"> -2.更改默认的远程连接ssh服务端口及禁止root用户远程连接</span></p>
<p><span style="color: rgba(0, 0, 0, 1)"> -3.定时自动更新服务器时间</span></p>
<p><span style="color: rgba(0, 0, 0, 1)"> -4.配置yum更新源，从国内更新源下载安装yum包</span></p>
<p><span style="color: rgba(0, 0, 0, 1)"> -5.关闭selinux及iptables（iptables工作场景如果有wan ip 一般要打开，高并发除外）</span></p>
<p><span style="color: rgba(0, 0, 0, 1)"> -6.调整文件描述的数量</span></p>
<p><span style="color: rgba(0, 0, 0, 1)"> -7.定时清理/var/spool/clientmquene/目录的垃圾文件，防止inodes节点被占满<br></span></p>
<p><span style="color: rgba(0, 0, 0, 1)"> -8.精简开机启动服务</span></p>
<p><span style="color: rgba(0, 0, 0, 1)"> -9.Linux内核参数优化/etc/syysctl.conf, sysctl -p 生效</span></p>
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