diff --git a/arangodb/1.md b/arangodb/1.md
deleted file mode 100644
index e69de29..0000000
diff --git a/centos/centos8换源.md b/centos/centos8换源.md
new file mode 100644
index 0000000..1a44fc1
--- /dev/null
+++ b/centos/centos8换源.md
@@ -0,0 +1,26 @@
+# CentOS 8 换源，设置dnf / yum镜像
+    aliyun更新了centos8的说明
+    
+    1、备份
+    mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
+    
+    2、下载新的CentOS-Base.repo 到/etc/yum.repos.d/
+    curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-8.repo
+    
+    3、生成缓存
+    yum makecache
+    
+    
+    4 配置镜像的。
+    
+    cd /etc/yum.repos.d
+    #备份
+    cp CentOS-Base.repo CentOS-Base.repo.bak;
+    cp CentOS-AppStream.repo CentOS-AppStream.repo.bak;
+    cp CentOS-Extras.repo CentOS-Extras.repo.bak;
+    
+    sed -i 's/mirrorlist=/#mirrorlist=/g' CentOS-Base.repo CentOS-AppStream.repo CentOS-Extras.repo;
+    sed -i 's/#baseurl=/baseurl=/g' CentOS-Base.repo CentOS-AppStream.repo CentOS-Extras.repo;
+    sed -i 's/http:\/\/mirror.centos.org/https:\/\/mirrors.aliyun.com/g' CentOS-Base.repo CentOS-AppStream.repo CentOS-Extras.repo
+    
+    
\ No newline at end of file
diff --git a/centos/ssh安装与配置.md b/centos/ssh安装与配置.md
new file mode 100644
index 0000000..350de8e
--- /dev/null
+++ b/centos/ssh安装与配置.md
@@ -0,0 +1,14 @@
+# 安装
+    yum install openssl
+    yum install openssl_server
+
+# ssh 生成密钥
+    ssh-keygen -q -t rsa -b 2048 -f /etc/ssh/ssh_host_rsa_key -N '' ; 
+    ssh-keygen -q -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N '';
+    ssh-keygen -t dsa -f /etc/ssh/ssh_host_ed25519_key -N '';
+    
+    8、配置ssh无密码登录
+    先退出 ssh客户端
+    ssh-keygen -t rsa
+    cd ~/.ssh
+    cat id_rsa.pub >> authorized_keys
\ No newline at end of file
diff --git a/erlang/1.md b/erlang/1.md
deleted file mode 100644
index e69de29..0000000
diff --git a/golang/centos8换源.md b/erlang/编译安装与简单安装.md
similarity index 74%
rename from golang/centos8换源.md
rename to erlang/编译安装与简单安装.md
index ce09280..c37dd88 100644
--- a/golang/centos8换源.md
+++ b/erlang/编译安装与简单安装.md
@@ -1,39 +1,3 @@
-# CentOS 8 换源，设置dnf / yum镜像
-    aliyun更新了centos8的说明
-    
-    1、备份
-    mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
-    
-    2、下载新的CentOS-Base.repo 到/etc/yum.repos.d/
-    curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-8.repo
-    
-    3、生成缓存
-    yum makecache
-    
-    
-    4 配置镜像的。
-    
-    cd /etc/yum.repos.d
-    #备份
-    cp CentOS-Base.repo CentOS-Base.repo.bak;
-    cp CentOS-AppStream.repo CentOS-AppStream.repo.bak;
-    cp CentOS-Extras.repo CentOS-Extras.repo.bak;
-    
-    sed -i 's/mirrorlist=/#mirrorlist=/g' CentOS-Base.repo CentOS-AppStream.repo CentOS-Extras.repo;
-    sed -i 's/#baseurl=/baseurl=/g' CentOS-Base.repo CentOS-AppStream.repo CentOS-Extras.repo;
-    sed -i 's/http:\/\/mirror.centos.org/https:\/\/mirrors.aliyun.com/g' CentOS-Base.repo CentOS-AppStream.repo CentOS-Extras.repo
-    
-# ssh 生成密钥
-    ssh-keygen -q -t rsa -b 2048 -f /etc/ssh/ssh_host_rsa_key -N '' ; 
-    ssh-keygen -q -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N '';
-    ssh-keygen -t dsa -f /etc/ssh/ssh_host_ed25519_key -N '';
-    
-    8、配置ssh无密码登录
-    先退出 ssh客户端
-    ssh-keygen -t rsa
-    cd ~/.ssh
-    cat id_rsa.pub >> authorized_keys
-    
 # 安装 wxWidgets
     先安装 
         安装wxWidgets相关依赖，不装这个就会报以下错误