diff --git a/SSH.md b/SSH.md
index 32cd8f70..20a6d59b 100644
--- a/SSH.md
+++ b/SSH.md
@@ -1,3 +1,4 @@
+
 # SSH（Secure Shell）介绍
 
 
@@ -55,6 +56,8 @@
    - `sudo chmod 700 /root/.ssh`
    - `sudo chmod 600 /root/.ssh/authorized_keys`
 - 重启服务：`sudo service sshd restart`
+- 注意：CentOS7重启服务和之前的不一样了
+- `sudo systemctl  restart sshd.service`
 - 设置 SSH 服务默认启动：`sudo sysv-rc-conf ssh on`
 - 现在 SSH 客户端可以去拿着 SSH 服务器端上的 id_rsa，在客户端指定秘钥文件地址即可，这个一般由于你使用的客户端决定的，我这里推荐的是 Xshell 软件。
 
diff --git a/ubuntu-settings/Ubuntu-Extra-Packages.md b/ubuntu-settings/Ubuntu-Extra-Packages.md
index 3500611c..867c42b8 100644
--- a/ubuntu-settings/Ubuntu-Extra-Packages.md
+++ b/ubuntu-settings/Ubuntu-Extra-Packages.md
@@ -31,3 +31,88 @@
     deb-src http://mirrors.163.com/ubuntu/ trusty-backports main restricted universe multiverse
     ```
     - 更换源之后，需要在终端中执行：`sudo apt-get update`，这是必须做的，不然你后面可能会遇到 apt-get 安装会提示：未发现软件包。
+    
+## 三：ubuntu各个版本的阿里云源内容
+# 系统版本：ubuntu16.04
+
+# 3.1.1：阿里源：
+
+deb-src http://archive.ubuntu.com/ubuntu xenial main restricted #Added by software-properties
+deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted
+deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted multiverse universe #Added by software-properties
+deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted
+deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted multiverse universe #Added by software-properties
+deb http://mirrors.aliyun.com/ubuntu/ xenial universe
+deb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe
+deb http://mirrors.aliyun.com/ubuntu/ xenial multiverse
+deb http://mirrors.aliyun.com/ubuntu/ xenial-updates multiverse
+deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
+deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse #Added by software-properties
+deb http://archive.canonical.com/ubuntu xenial partner
+deb-src http://archive.canonical.com/ubuntu xenial partner
+deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted
+deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted multiverse universe #Added by software-properties
+deb http://mirrors.aliyun.com/ubuntu/ xenial-security universe
+deb http://mirrors.aliyun.com/ubuntu/ xenial-security multiverse
+
+# 3.1.2：东北大学：
+
+deb-src http://mirror.neu.edu.cn/ubuntu/ xenial main restricted #Added by software-properties
+deb http://mirror.neu.edu.cn/ubuntu/ xenial main restricted
+deb-src http://mirror.neu.edu.cn/ubuntu/ xenial restricted multiverse universe #Added by software-properties
+deb http://mirror.neu.edu.cn/ubuntu/ xenial-updates main restricted
+deb-src http://mirror.neu.edu.cn/ubuntu/ xenial-updates main restricted multiverse universe #Added by software-properties
+deb http://mirror.neu.edu.cn/ubuntu/ xenial universe
+deb http://mirror.neu.edu.cn/ubuntu/ xenial-updates universe
+deb http://mirror.neu.edu.cn/ubuntu/ xenial multiverse
+deb http://mirror.neu.edu.cn/ubuntu/ xenial-updates multiverse
+deb http://mirror.neu.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
+deb-src http://mirror.neu.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse #Added by software-properties
+deb http://archive.canonical.com/ubuntu xenial partner deb-src http://archive.canonical.com/ubuntu xenial partner
+deb http://mirror.neu.edu.cn/ubuntu/ xenial-security main restricted
+deb-src http://mirror.neu.edu.cn/ubuntu/ xenial-security main restricted multiverse universe #Added by software-properties
+deb http://mirror.neu.edu.cn/ubuntu/ xenial-security universe
+deb http://mirror.neu.edu.cn/ubuntu/ xenial-security multiverse
+
+# 3.1.3：清华大学：
+
+deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted
+deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted
+deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial universe
+deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates universe
+deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial multiverse
+deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates multiverse
+deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
+deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted
+deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security universe deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security multiverse
+
+## 3.2：ubuntu 14.04 
+# 3.2.1：Ubuntu 官方更新服务器（欧洲，此为官方源，国内较慢，但无同步延迟问题，电信、移动/铁通、联通等公网用户可以使用)：
+
+deb http://archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse
+deb http://archive.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse
+deb http://archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse
+deb http://archive.ubuntu.com/ubuntu/ trusty-proposed main restricted universe multiverse
+deb http://archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
+deb-src http://archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse
+deb-src http://archive.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse
+deb-src http://archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse
+deb-src http://archive.ubuntu.com/ubuntu/ trusty-proposed main restricted universe multiverse
+deb-src http://archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
+
+Ubuntu官方提供的其他软件（第三方闭源软件等）：
+
+deb http://archive.canonical.com/ubuntu/ trusty partner
+deb http://extras.ubuntu.com/ubuntu/ trusty main
+# 3.2.2：阿里云：
+
+deb http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse
+deb http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse
+deb http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse
+deb http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse
+deb http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse
+deb-src http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse
+deb-src http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse
+deb-src http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse
+deb-src http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse
+deb-src http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse