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<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
<channel>
<title>阿苏以北</title>
<link>/</link>
<description>Recent content on 阿苏以北</description>
<generator>Hugo -- gohugo.io</generator>
<language>en</language>
<managingEditor>[email protected] (wulron)</managingEditor>
<webMaster>[email protected] (wulron)</webMaster>
<copyright>&copy;2017-{year}, All Rights Reserved</copyright>
<lastBuildDate>Mon, 18 Nov 2019 21:00:06 +0900</lastBuildDate>
<atom:link href="/index.xml" rel="self" type="application/rss+xml" />
<item>
<title>Viz support</title>
<link>/posts/test-viz/</link>
<pubDate>Mon, 18 Nov 2019 21:00:06 +0900</pubDate>
<author>[email protected] (wulron)</author>
<guid>/posts/test-viz/</guid>
<description>digraph G { subgraph cluster_0 { style=filled; color=lightgrey; node [style=filled,color=white]; a0 -&gt; a1 -&gt; a2 -&gt; a3; label = &quot;process #1&quot;; } subgraph cluster_1 { node [style=filled]; b0 -&gt; b1 -&gt; b2 -&gt; b3; label = &quot;process #2&quot;; color=blue } start -&gt; a0; start -&gt; b0; a1 -&gt; b3; b2 -&gt; a3; a3 -&gt; a0; a3 -&gt; end; b3 -&gt; end; start [shape=Mdiamond]; end [shape=Msquare]; } </description>
</item>
<item>
<title>Wavedrom support</title>
<link>/posts/test-wavedrom/</link>
<pubDate>Mon, 18 Nov 2019 18:00:06 +0900</pubDate>
<author>[email protected] (wulron)</author>
<guid>/posts/test-wavedrom/</guid>
<description>{ &quot;signal&quot;: [ {&quot;name&quot;: &quot;CLK&quot;, &quot;wave&quot;: &quot;p.....|...&quot;}, {&quot;name&quot;:&quot;DAT&quot;, &quot;wave&quot;:&quot;x.345x|=.x&quot;, &quot;data&quot;:[&quot;A&quot;,&quot;B&quot;,&quot;C&quot;,&quot;D&quot;]}, {&quot;name&quot;: &quot;REQ&quot;, &quot;wave&quot;: &quot;0.1..0|1.0&quot;}, {}, {&quot;name&quot;: &quot;ACK&quot;, &quot;wave&quot;: &quot;1.....|01.&quot;} ]} </description>
</item>
<item>
<title>Chart support</title>
<link>/posts/test-chartjs/</link>
<pubDate>Mon, 18 Nov 2019 12:00:06 +0900</pubDate>
<author>[email protected] (wulron)</author>
<guid>/posts/test-chartjs/</guid>
<description>{ &quot;type&quot;: &quot;bar&quot;, &quot;data&quot;: { &quot;labels&quot;: [&quot;One&quot;, &quot;Two&quot;, &quot;Three&quot;, &quot;Four&quot;, &quot;Five&quot;, &quot;Six&quot;], &quot;datasets&quot;: [{ &quot;label&quot;: &quot;# of Votes&quot;, &quot;data&quot;: [12, 19, 3, 5, 3, 8] }] } } { &quot;type&quot;: &quot;line&quot;, &quot;data&quot;: { &quot;labels&quot;: [&quot;One&quot;, &quot;Two&quot;, &quot;Three&quot;, &quot;Four&quot;, &quot;Five&quot;, &quot;Six&quot;], &quot;datasets&quot;: [ { &quot;label&quot;: &quot;# of Votes&quot;, &quot;data&quot;: [12, 19, 3, 5, 2, 3], &quot;backgroundColor&quot;:&quot;transparent&quot;, &quot;borderColor&quot;:&quot;orange&quot; }, { &quot;label&quot;: &quot;Some other set&quot;, &quot;data&quot;: [15, 8, 13, 5, 5, 9], &quot;backgroundColor&quot;:&quot;transparent&quot;, &quot;borderColor&quot;:&quot;#44ccff&quot; } ] } } </description>
</item>
<item>
<title>JS Sequence Diagram support</title>
<link>/posts/test-js-sequence-diagrams/</link>
<pubDate>Mon, 18 Nov 2019 12:00:06 +0900</pubDate>
<author>[email protected] (wulron)</author>
<guid>/posts/test-js-sequence-diagrams/</guid>
<description>Alice-&gt;Bob: Hello Bob, how are you? Note right of Bob: Bob thinks Bob--&gt;Alice: I am good thanks! Title: Here is a title A-&gt;B: Normal line B--&gt;C: Dashed line C-&gt;&gt;D: Open arrow D--&gt;&gt;A: Dashed open arrow </description>
</item>
<item>
<title>Mermaid support</title>
<link>/posts/test-mermaid/</link>
<pubDate>Sun, 17 Nov 2019 12:00:06 +0900</pubDate>
<author>[email protected] (wulron)</author>
<guid>/posts/test-mermaid/</guid>
<description>graph TD; A--&gt;B; A--&gt;C; B--&gt;D; C--&gt;D; graph TD; A--&gt;B; A--&gt;C; B--&gt;D; C--&gt;D; graph TD; A--&gt;B; A--&gt;C; B--&gt;D; C--&gt;D; sequenceDiagram participant Alice participant Bob Alice-&gt;John: Hello John, how are you? loop Healthcheck John-&gt;John: Fight against hypochondria end Note right of John: Rational thoughts &lt;br/&gt;prevail... John--&gt;Alice: Great! John-&gt;Bob: How about you? Bob--&gt;John: Jolly good! graph TD A[Hard] --&gt;|Text| B(Round) B --&gt; C{Decision} C --&gt;|One| D[Result 1] C --&gt;|Two| E[Result 2] gantt section Section Completed :done, des1, 2014-01-06,2014-01-08 Active :active, des2, 2014-01-07, 3d Parallel 1 : des3, after des1, 1d Parallel 2 : des4, after des1, 1d Parallel 3 : des5, after des3, 1d Parallel 4 : des6, after des4, 1d classDiagram Class01 &lt;|-- AveryLongClass : Cool &lt;&lt;interface&gt;&gt; Class01 Class09 --&gt; C2 : Where am i?</description>
</item>
<item>
<title>MathJax support</title>
<link>/posts/test-mathjax/</link>
<pubDate>Sat, 16 Nov 2019 12:00:06 +0900</pubDate>
<author>[email protected] (wulron)</author>
<guid>/posts/test-mathjax/</guid>
<description>When \(a \ne 0\), there are two solutions to \((ax^2 + bx + c = 0)\) and they are
\[x = {-b \pm \sqrt{b^2-4ac} \over 2a}.\]</description>
</item>
<item>
<title>Katex support</title>
<link>/posts/test-katext/</link>
<pubDate>Fri, 15 Nov 2019 12:00:06 +0900</pubDate>
<author>[email protected] (wulron)</author>
<guid>/posts/test-katext/</guid>
<description>The following
$$ \int_{a}^{b} x^2 dx $$
Is an integral
$$
\varphi = 1+\frac{1} {1+\frac{1} {1+\frac{1} {1+\cdots} } }
$$
Enable Katex in the config file by setting the katex param to true. This will import the necessary Katex CSS/JS.
See the online reference of supported TeX functions.
Note: For inline math to render correctly, your content file extension must be .mmark. See the official mmark site.
Inline math: $$ \varphi = \dfrac{1+\sqrt5}{2}= 1.</description>
</item>
<item>
<title>Flowchart support</title>
<link>/posts/test-flowchart/</link>
<pubDate>Thu, 14 Nov 2019 12:00:06 +0900</pubDate>
<author>[email protected] (wulron)</author>
<guid>/posts/test-flowchart/</guid>
<description>st=&gt;start: Start|past:&gt;http://www.google.com[blank] e=&gt;end: End|future:&gt;http://www.google.com op1=&gt;operation: My Operation|past op2=&gt;operation: Stuff|current sub1=&gt;subroutine: My Subroutine|invalid cond=&gt;condition: Yes or No?|approved:&gt;http://www.google.com c2=&gt;condition: Good idea|rejected io=&gt;inputoutput: catch something...|future st-&gt;op1(right)-&gt;cond cond(yes, right)-&gt;c2 cond(no)-&gt;sub1(left)-&gt;op1 c2(yes)-&gt;io-&gt;e c2(no)-&gt;op2-&gt;e </description>
</item>
<item>
<title>Markdown Syntax Guide</title>
<link>/posts/markdown-syntax/</link>
<pubDate>Mon, 11 Mar 2019 00:00:00 +0000</pubDate>
<author>[email protected] (wulron)</author>
<guid>/posts/markdown-syntax/</guid>
<description><p>This article offers a sample of basic Markdown syntax that can be used in Hugo content files, also it shows whether basic HTML elements are decorated with CSS in a Hugo theme.</p></description>
</item>
<item>
<title>Placeholder Text</title>
<link>/posts/placeholder-text/</link>
<pubDate>Sat, 09 Mar 2019 00:00:00 +0000</pubDate>
<author>[email protected] (wulron)</author>
<guid>/posts/placeholder-text/</guid>
<description><p>Lorem est tota propiore conpellat pectoribus de<br />
pectora summo.</p></description>
</item>
<item>
<title>Math Typesetting</title>
<link>/posts/math-typesetting/</link>
<pubDate>Fri, 08 Mar 2019 00:00:00 +0000</pubDate>
<author>[email protected] (wulron)</author>
<guid>/posts/math-typesetting/</guid>
<description><p>Mathematical notation in a Hugo project can be enabled by using third party JavaScript libraries.</p></description>
</item>
<item>
<title>Emoji Support</title>
<link>/posts/emoji-support/</link>
<pubDate>Tue, 05 Mar 2019 00:00:00 +0000</pubDate>
<author>[email protected] (wulron)</author>
<guid>/posts/emoji-support/</guid>
<description><p>Emoji can be enabled in a Hugo project in a number of ways.</p></description>
</item>
<item>
<title>About</title>
<link>/about/</link>
<pubDate>Thu, 28 Feb 2019 00:00:00 +0000</pubDate>
<author>[email protected] (wulron)</author>
<guid>/about/</guid>
<description>Written in Go, Hugo is an open source static site generator available under the Apache Licence 2.0. Hugo supports TOML, YAML and JSON data file types, Markdown and HTML content files and uses shortcodes to add rich content. Other notable features are taxonomies, multilingual mode, image processing, custom output formats, HTML/CSS/JS minification and support for Sass SCSS workflows.
Hugo makes use of a variety of open source projects including:
https://github.</description>
</item>
<item>
<title>homebrew源替换及恢复</title>
<link>/posts/homebrew%E6%BA%90%E6%9B%BF%E6%8D%A2%E5%8F%8A%E6%81%A2%E5%A4%8D/</link>
<pubDate>Mon, 08 Oct 2018 00:00:00 +0000</pubDate>
<author>[email protected] (wulron)</author>
<guid>/posts/homebrew%E6%BA%90%E6%9B%BF%E6%8D%A2%E5%8F%8A%E6%81%A2%E5%A4%8D/</guid>
<description>在国内的网络环境下使用 Homebrew 安装软件的过程中可能会长时间卡在 Updating Homebrew 这个步骤。
例：执行 brew install composer 命令
1 2 ~ brew install composer Updating Homebrew... # 如果碰到长时间卡在这里，参考以下 2 种处理方法 方法 1：按住 control + c 取消本次更新操作 1 2 3 ~ brew install composer Updating Homebrew... ^C 按住 control + c 之后命令行会显示 ^C，就代表已经取消了 Updating Homebrew 操作
大概不到 1 秒钟之后就会去执行我们真正需要的安装操作了
1 2 3 4 5 ~ brew install composer Updating Homebrew... ^C==&gt; Satisfying dependencies ==&gt; Downloading https://getcomposer.</description>
</item>
<item>
<title>CentOS服务器日志数据量过大，占用磁盘过高</title>
<link>/posts/logrotate/</link>
<pubDate>Mon, 18 Jun 2018 00:00:00 +0000</pubDate>
<author>[email protected] (wulron)</author>
<guid>/posts/logrotate/</guid>
<description>简介 logrotate 是一个 linux 系统日志的管理工具。它可以切割、压缩等其他软件的日志文件软件。
logrotate 是基于 crontab 运行的，所以这个时间点是由 crontab 控制的，其脚本是/etc/cron.daily/logrotate。Logrotate 会调用配置文件/etc/logrotate.conf。
可以在/etc/logrotate.d 目录里放置自定义好的配置文件，用来覆盖 Logrotate 的缺省值
安装 1 yum -y install logrotate 查看配置文件路径
1 rpm -ql logrotate /etc/logrotate.conf logrotate 的配置文件是 /etc/logrotate.d/ 是用于存储其他配置文件的目录 1 vim /etc/logrotate.d/nginx 1 2 3 4 5 6 7 8 9 10 11 12 13 14 /var/log/nginx/*.log { daily rotate 7 missingok notifempty dateext compress sharedscripts postrotate if [ -f /run/nginx.</description>
</item>
<item>
<title>CentOS系统上2msl时间过长，占用内存过高</title>
<link>/posts/time_wait/</link>
<pubDate>Mon, 18 Jun 2018 00:00:00 +0000</pubDate>
<author>[email protected] (wulron)</author>
<guid>/posts/time_wait/</guid>
<description>/etc/sysctl.conf
编辑文件，加入以下内容：
1 2 3 4 1. net.ipv4.tcp_syncookies = 1 2. net.ipv4.tcp_tw_reuse = 1 3. net.ipv4.tcp_tw_recycle = 1 4. net.ipv4.tcp_fin_timeout = 30 然后执行/sbin/sysctl -p让参数生效。
net.ipv4.tcp_syncookies = 1 表示开启SYN Cookies。当出现SYN等待队列溢出时，启用cookies来处理，可防范少量SYN攻击，默认为0，表示关闭；
net.ipv4.tcp_tw_reuse = 1表示开启重用。允许将TIME-WAIT sockets重新用于新的TCP连接，默认为0，表示关闭；
net.ipv4.tcp_tw_recycle = 1表示开启TCP连接中TIME-WAIT sockets的快速回收，默认为0，表示关闭。
net.ipv4.tcp_fin_timeout修改系統默认的TIMEOUT时间
修改之后，再用命令查看TIME_WAIT连接数netstat -ant |grep &quot;TIME_WAIT&quot; |wc –l</description>
</item>
<item>
<title>C制作证书</title>
<link>/posts/%E5%88%B6%E4%BD%9C%E8%AF%81%E4%B9%A6/</link>
<pubDate>Mon, 18 Jun 2018 00:00:00 +0000</pubDate>
<author>[email protected] (wulron)</author>
<guid>/posts/%E5%88%B6%E4%BD%9C%E8%AF%81%E4%B9%A6/</guid>
<description>制作证书 在服务端支持Rpc和Restful Api，需要用到TLS，因此我们要先制作证书
进入certs目录，生成TLS所需的公钥密钥文件
私钥 openssl genrsa -out server.key 2048 openssl ecparam -genkey -name secp384r1 -out server.key openssl genrsa：生成RSA私钥，命令的最后一个参数，将指定生成密钥的位数，如果没有指定，默认512 openssl ecparam：生成ECC私钥，命令为椭圆曲线密钥参数生成及操作，本文中ECC曲线选择的是secp384r1 自签名公钥 openssl req -new -x509 -sha256 -key server.key -out server.pem -days 3650 openssl req：生成自签名证书，-new指生成证书请求、-sha256指使用sha256加密、-key指定私钥文件、-x509指输出证书、-days 3650为有效期，此后则输入证书拥有者信息 填写信息 Country Name (2 letter code) [XX]: State or Province Name (full name) []: Locality Name (eg, city) [Default City]: Organization Name (eg, company) [Default Company Ltd]: Organizational Unit Name (eg, section) []: Common Name (eg, your name or your server's hostname) []:grpc server name Ema </description>
</item>
<item>
<title>redis慎用keys *和flushadb</title>
<link>/posts/redis-keys/</link>
<pubDate>Mon, 18 Jun 2018 00:00:00 +0000</pubDate>
<author>[email protected] (wulron)</author>
<guid>/posts/redis-keys/</guid>
<description>查看链接 redis 的服务器 ip 1 2 3 redis-cli -h 地址 -a 密码 CLIENT LIST|awk -F &#34;addr=&#34; &#39;{print $2}&#39;|awk -F &#34;:&#34; &#39;{print $1}&#39;|sort|uniq 这样就可以看到谁链接了，当前执行命令的机器也会在里面~ 灾难性的 keys * reidds是单线程，当程序中有大量key时，使用keys *,会导致线程阻塞。特别时对于线上程序来说， 阻塞几秒钟时非常严重的。
替换 keys * 操作 1 2 3 4 5 6 7 所有要查询key的命令，要用 scan来代替，分片的处理 滥用flushdb flushall 同keys * ，使用scan查询keys之后删除即可。 http://doc.redisfans.com/key/scan.html 这里有使用的中文文档，count可以控制在 100，通过游标一直遍历下去，不会导致长时间的锁。 keys * 会整体锁住，scan只会遍历 count个数据，速度极快 </description>
</item>
<item>
<title>Syntax highlighting</title>
<link>/notes/hugo/syntax-highlight/</link>
<pubDate>Wed, 11 Oct 2017 10:33:41 +0900</pubDate>
<author>[email protected] (wulron)</author>
<guid>/notes/hugo/syntax-highlight/</guid>
<description>Dolore in consectetur irure qui laborum. Adipisicing cillum ad laboris dolor. Quis consectetur ullamco esse ad mollit anim sint nostrud esse. Irure voluptate ex fugiat voluptate ea fugiat laboris.
This is a blockqute.
line
line
Code Syntax Highlighting Verify the following code blocks render as code blocks and highlight properly.
Diff 1 2 3 4 5 6 7 8 9 10 *** /path/to/original &#39;&#39;timestamp&#39;&#39; --- /path/to/new &#39;&#39;timestamp&#39;&#39; *************** *** 1 **** !</description>
</item>
<item>
<title>Note-1</title>
<link>/notes/sublist/note-1/</link>
<pubDate>Sun, 09 Oct 2016 11:44:14 +0900</pubDate>
<author>[email protected] (wulron)</author>
<guid>/notes/sublist/note-1/</guid>
<description>post-1 content
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut eget enim lobortis, bibendum massa et, bibendum enim. Nunc eu augue quis ante porta sodales. Mauris vel faucibus magna, dictum sagittis dolor. Nam scelerisque malesuada efficitur. Donec consequat sodales justo, ut aliquam ligula maximus nec. Quisque metus tellus, tincidunt eu consequat consequat, placerat sed ante. Cras pulvinar eros ex, vel luctus eros viverra sed. Donec nec quam aliquam, ultricies neque sed, sollicitudin lorem.</description>
</item>
<item>
<title>Note-2</title>
<link>/notes/sublist/note-2/</link>
<pubDate>Sun, 09 Oct 2016 11:44:14 +0900</pubDate>
<author>[email protected] (wulron)</author>
<guid>/notes/sublist/note-2/</guid>
<description>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut eget enim lobortis, bibendum massa et, bibendum enim. Nunc eu augue quis ante porta sodales. Mauris vel faucibus magna, dictum sagittis dolor. Nam scelerisque malesuada efficitur. Donec consequat sodales justo, ut aliquam ligula maximus nec.</description>
</item>
<item>
<title>Note-3</title>
<link>/notes/sublist/note-3/</link>
<pubDate>Sun, 09 Oct 2016 11:44:14 +0900</pubDate>
<author>[email protected] (wulron)</author>
<guid>/notes/sublist/note-3/</guid>
<description>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut eget enim lobortis, bibendum massa et, bibendum enim. Nunc eu augue quis ante porta sodales. Mauris vel faucibus magna, dictum sagittis dolor. Nam scelerisque malesuada efficitur. Donec consequat sodales justo, ut aliquam ligula maximus nec.</description>
</item>
<item>
<title>Go 1</title>
<link>/notes/sublist/go/go-1/go-1-1/go-1/</link>
<pubDate>Thu, 01 Nov 2012 10:33:41 +0900</pubDate>
<author>[email protected] (wulron)</author>
<guid>/notes/sublist/go/go-1/go-1-1/go-1/</guid>
<description>Dolore in consectetur irure qui laborum. Adipisicing cillum ad laboris dolor. Quis consectetur ullamco esse ad mollit anim sint nostrud esse. Irure voluptate ex fugiat voluptate ea fugiat laboris.
Veniam deserunt ex ullamco laboris et elit culpa enim. Irure ipsum dolore sint nisi aliquip labore fugiat magna esse ad nostrud in. Eu aliqua mollit tempor proident pariatur voluptate.</description>
</item>
<item>
<title>Go 2</title>
<link>/notes/sublist/go/go-1/go-2/</link>
<pubDate>Thu, 01 Nov 2012 10:33:41 +0900</pubDate>
<author>[email protected] (wulron)</author>
<guid>/notes/sublist/go/go-1/go-2/</guid>
<description>Dolore in consectetur irure qui laborum. Adipisicing cillum ad laboris dolor. Quis consectetur ullamco esse ad mollit anim sint nostrud esse. Irure voluptate ex fugiat voluptate ea fugiat laboris.
Veniam deserunt ex ullamco laboris et elit culpa enim. Irure ipsum dolore sint nisi aliquip labore fugiat magna esse ad nostrud in. Eu aliqua mollit tempor proident pariatur voluptate.</description>
</item>
<item>
<title>Go 4</title>
<link>/notes/sublist/go/go-4/</link>
<pubDate>Thu, 01 Nov 2012 10:33:41 +0900</pubDate>
<author>[email protected] (wulron)</author>
<guid>/notes/sublist/go/go-4/</guid>
<description>Dolore in consectetur irure qui laborum. Adipisicing cillum ad laboris dolor. Quis consectetur ullamco esse ad mollit anim sint nostrud esse. Irure voluptate ex fugiat voluptate ea fugiat laboris.
Veniam deserunt ex ullamco laboris et elit culpa enim. Irure ipsum dolore sint nisi aliquip labore fugiat magna esse ad nostrud in. Eu aliqua mollit tempor proident pariatur voluptate.</description>
</item>
<item>
<title>Go 5</title>
<link>/notes/sublist/go/go-1/go-1-1/go-1-1-1/go-5/</link>
<pubDate>Thu, 01 Nov 2012 10:33:41 +0900</pubDate>
<author>[email protected] (wulron)</author>
<guid>/notes/sublist/go/go-1/go-1-1/go-1-1-1/go-5/</guid>
<description>Dolore in consectetur irure qui laborum. Adipisicing cillum ad laboris dolor. Quis consectetur ullamco esse ad mollit anim sint nostrud esse. Irure voluptate ex fugiat voluptate ea fugiat laboris.
Veniam deserunt ex ullamco laboris et elit culpa enim. Irure ipsum dolore sint nisi aliquip labore fugiat magna esse ad nostrud in. Eu aliqua mollit tempor proident pariatur voluptate.</description>
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