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+## Centos
+1. 备份原文件
+2. 下载新的Centos-Base.repo 到 /etc/yum.repos.d/
+3. 生成缓存
+
+```
+mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
+
+# CentOS 7
+wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
+
+yum makecache
+```
+
+## NPM
+
+npm install -g cnpm -registry=https://registry.npm.taobao.org
+
+## Visual Studio Code
+
+用户设置
+```json
+{
+    "[ruby]":{
+    "editor.tabSize": 2,
+    "editor.detectIndentation": false,
+    "editor.insertSpaces": true,
+    "files.trimTrailingWhitespace": true
+    },
+    "files.eol": "\n",
+    // "sublimeTextKeymap.promptV3Features": true,
+    "editor.multiCursorModifier": "ctrlCmd",
+    "editor.snippetSuggestions": "top",
+    "editor.formatOnPaste": true,
+    "window.zoomLevel": 0,
+    "extensions.ignoreRecommendations": false,
+    "git.ignoreMissingGitWarning": true,
+    "editor.fontSize": 16
+}
+```
+
+快捷键设置
+```json
+// 将键绑定放入此文件中以覆盖默认值
+[
+    {
+        // "key": "ctrl+shift+alt+up",
+        "key": "shift+alt+up",
+        "command": "cursorColumnSelectUp",
+        "when": "editorTextFocus"
+    },
+    {
+        // "key": "ctrl+shift+alt+down",
+        "key": "shift+alt+down",
+        "command": "cursorColumnSelectDown",
+        "when": "editorTextFocus"
+    },
+    {
+        // "key": "ctrl+r",
+        "key": "ctrl+alt+o",
+        "command": "workbench.action.openRecent"
+    },
+    {
+        // "key": "ctrl+shift+o",
+        "key": "ctrl+r",
+        "command": "workbench.action.gotoSymbol"
+    },
+    {
+        // "key": "shift+alt+down",
+        "key": "ctrl+shift+d",
+        "command": "editor.action.copyLinesDownAction",
+        "when": "editorTextFocus && !editorReadonly"
+    },
+    {
+        // "key": "shift+alt+up",
+        "key": "ctrl+shift+alt+up",
+        "command": "editor.action.copyLinesUpAction",
+        "when": "editorTextFocus && !editorReadonly"
+    }
+]
+```
+
+## ShadowsocksR
+
+部署Shadowsocks服务器时，注意配置防火墙开放端口访问
+
+```sh
+service iptables status
+/sbin/iptables -I INPUT -p tcp --dport 1099 -j ACCEPT
+service iptables save
+```
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