diff --git a/.idea/checkstyle-idea.xml b/.idea/checkstyle-idea.xml
new file mode 100644
index 0000000..87234f9
--- /dev/null
+++ b/.idea/checkstyle-idea.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CheckStyle-IDEA" serialisationVersion="2">
+    <checkstyleVersion>10.23.0</checkstyleVersion>
+    <scanScope>JavaOnly</scanScope>
+    <copyLibs>true</copyLibs>
+    <option name="thirdPartyClasspath" />
+    <option name="activeLocationIds" />
+    <option name="locations">
+      <list>
+        <ConfigurationLocation id="bundled-sun-checks" type="BUNDLED" scope="All" description="Sun Checks">(bundled)</ConfigurationLocation>
+        <ConfigurationLocation id="bundled-google-checks" type="BUNDLED" scope="All" description="Google Checks">(bundled)</ConfigurationLocation>
+      </list>
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/php.xml b/.idea/php.xml
new file mode 100644
index 0000000..8250cf4
--- /dev/null
+++ b/.idea/php.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="PhpCodeSniffer">
+    <phpcs_settings>
+      <PhpCSConfiguration asDefaultInterpreter="true" />
+    </phpcs_settings>
+  </component>
+</project>
\ No newline at end of file
diff --git a/docs/dev-ops/os/linux.md b/docs/dev-ops/os/linux.md
index 5b43bef..f09636f 100644
--- a/docs/dev-ops/os/linux.md
+++ b/docs/dev-ops/os/linux.md
@@ -2,11 +2,14 @@
 
 最近在对公司的 Linux 服务器进行一些初始化的安装和配置工作。对一个新的机器可能遇到的问题还比较多，先记录下来供以后参考。
 
-| 配置内容                   | Ubuntu                                           | REL                                            |
-|------------------------|--------------------------------------------------|------------------------------------------------|
-| Linux 安装 NTP 时间服务器     | https://www.isharkfly.com/t/ubuntu/16971         | https://www.isharkfly.com/t/linux-ntp/10441    |
-| Firewall-cmd 安装和配置开放端口 |                                                  | https://www.isharkfly.com/t/firewall-cmd/13715 |
-| Linux 设置主机名            | https://www.isharkfly.com/t/ubuntu/16970         | https://www.isharkfly.com/t/linux/15230        |
-| Linux 安装 httpd 服务器     |                                                  | https://www.isharkfly.com/t/linux-httpd/15231  |
-| Linux 中安装 nginx        | https://www.isharkfly.com/t/ubuntu-nginx/16722/2 | https://www.isharkfly.com/t/linux-nginx/13951  |
-| Linux 中安装 防火墙          | https://www.isharkfly.com/t/ubuntu/13527         |                                                |
+| 配置内容                      | Ubuntu                                               | REL                                            |
+|---------------------------|------------------------------------------------------|------------------------------------------------|
+| Linux 安装 NTP 时间服务器        | https://www.isharkfly.com/t/ubuntu/16971             | https://www.isharkfly.com/t/linux-ntp/10441    |
+| Firewall-cmd 安装和配置开放端口    |                                                      | https://www.isharkfly.com/t/firewall-cmd/13715 |
+| Linux 设置主机名               | https://www.isharkfly.com/t/ubuntu/16970             | https://www.isharkfly.com/t/linux/15230        |
+| Linux 安装 httpd 服务器        |                                                      | https://www.isharkfly.com/t/linux-httpd/15231  |
+| Linux Apache 安装配置 SSL     | https://www.isharkfly.com/t/ubuntu-apache2-ssl/17522 | https://www.isharkfly.com/t/linux-httpd/15231  |
+| Linux Apache 强制默认使用 https | https://www.isharkfly.com/t/apache2-https/17523      |                                                |
+| Linux 中安装 nginx           | https://www.isharkfly.com/t/ubuntu-nginx/16722/2     | https://www.isharkfly.com/t/linux-nginx/13951  |
+| Linux 中安装 防火墙             | https://www.isharkfly.com/t/ubuntu/13527             |                                                |
+