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<h1><a href="http://www.7rack.info/issues-of-Feb.html"> 问题集锦(二月) </a></h1>
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<h4>Contents</h4>
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<li><a href="#cmd">cmd</a></li>
<li><a href="#ssh">ssh</a></li>
<li><a href="#_1">双线动态路由</a></li>
<li><a href="#_2">硬件</a></li>
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<h2 id="cmd">cmd<a class="headerlink" href="#cmd" title="Permanent link">¶</a></h2>
<p>让当前目录下的文件和文件夹按大小排序输出，一开始把问题想复杂了。
可以通过一句命令,可读性也很好：</p>
<div class="highlight"><pre><span class="c"># du -hs * | sort -h </span>
<span class="m">0</span> misc
<span class="m">0</span> net
<span class="m">0</span> proc
<span class="m">0</span> sys
4.0K media
4.0K mnt
4.0K srv
16K lost+found
24K ftp
100K home
164K dev
4.3M opt
7.6M bin
11M tmp
14M sbin
25M lib64
34M etc
39M boot
125M lib
158M var
442M root
2.9G usr
</pre></div>
<h2 id="ssh">ssh<a class="headerlink" href="#ssh" title="Permanent link">¶</a></h2>
<p>当尝试通过域名连接一个 IP 已经变动（或经常变动）的主机，出现
host key for 'foo.example.com' differs from the key for the IP address 'xxxx' 信息。
可通过创建<code>~/.ssh/config</code>文件：</p>
<div class="highlight"><pre>Host foo
Hostname foo.example.com
CheckHostIP no
Port 32513
User danny
</pre></div>
<p>然后就可以通过<code>ssh foo</code>来连接。进一步的解释，可查看<code>man 5 ssh_config</code>。</p>
<p>另外，在服务端最好禁用公钥认证以外的其他认证方式。
和公钥认证有关配置项是：</p>
<ul>
<li><code>#RSAAuthentication yes</code>：Specifies whether pure RSA authentication is allowed.This option applies to protocol version 1 only</li>
<li><code>#PubkeyAuthentication yes</code>：Specifies whether public key authentication is allowed.Note that this option applies to protocol version 2 only.</li>
</ul>
<p>其缺省值一般为 yes。</p>
<p>禁用其他的认证方式，需修改下列配置项：</p>
<div class="highlight"><pre>PasswordAuthentication no
ChallengeResponseAuthentication no
UsePAM no
</pre></div>
<p>详细的解释，可查看<code>man 5 sshd_config</code>。</p>
<h2 id="_1">双线动态路由<a class="headerlink" href="#_1" title="Permanent link">¶</a></h2>
<p>针对 CentOS 环境的设置</p>
<ul>
<li>在<code>/etciproute2/rt_tables</code>中添加电信、网通路由表：</li>
</ul>
<div class="highlight"><pre> <span class="m">252</span> tel
<span class="m">251</span> cnc
</pre></div>
<ul>
<li>在<code>/etc/init.d/network</code>的最后一行<em>exit $rc</em>前添加电信、网通路由表内容：</li>
</ul>
<div class="highlight"><pre> ip route replace default via 电信网关 dev eth0 <span class="c">#默认路由线路</span>
ip route flush table tel <span class="c">#刷新tel路由表</span>
ip route add default via 电信网关 dev eth0 src 电信IP table tel <span class="c">#添加回环地址</span>
ip rule add from 电信IP table tel <span class="c">#从电信IP过来的，走tel路由</span>
ip route flush table cnc <span class="c">#刷新cnc路由表</span>
ip route add default via 网通网关 dev eth1 src 网通IP table cnc
ip rule add from 网通IP table cnc <span class="c">#从网通IP过来的走cnc路由</span>
</pre></div>
<h2 id="_2">硬件<a class="headerlink" href="#_2" title="Permanent link">¶</a></h2>
<p>E2110 Multibit Error on DIMM B2. Reseat DIMM.
简单查了下是<em>插槽 “B2” 中的内存模块已发生多位错误 (MBE)</em>。</p>
<p>Dell 的技术支持页面也有说明：</p>
<blockquote>
<p>内存错误可能会毁坏高速缓存的数据，所以控制器旨在检测到这些内存错误并尝试从这些内存错误中恢复。单位内存错误可以由固件处理而不影响正常运行。如果单位错误的数目超过了阈值，将发送通知。</p>
<p>多位错误更严重，因为此类错误会导致数据毁坏和数据丢失。以下是出现多位错误时采取的措施：</p>
<blockquote>
<p>如果在使用恶劣高速缓存启动控制器时访问高速缓存内存中的数据而导致多位错误，则固件将放弃高速缓存内容。固件将生成警告信息并发送到系统控制台，指示已放弃高速缓存并将生成事件。</p>
<p>如果在运行时代码/数据或高速缓存中出现多位错误，则固件将停止。</p>
<p>固件会将事件记录到固件内部事件日志并将在 POST 过程中记录指示已出现多位错误的信息。</p>
</blockquote>
<p>注：如果出现多位错误，请与 Dell 技术支持联络。</p>
</blockquote>
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<h4>Published</h4>
<time pubdate="pubdate" datetime="2014-02-25T13:03:17+08:00"> 2 25, 2014</time>
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