diff --git a/docs/_sidebar.md b/docs/_sidebar.md
index 53d2cd13c..d9ca132b3 100644
--- a/docs/_sidebar.md
+++ b/docs/_sidebar.md
@@ -14,15 +14,18 @@
 - 错误
   - [Mongo 启动失败](error/mongo-error.md)
 - 知识
+  - [安装 Centos7](tip/install-centos7.md)
   - [Centos 创建用户](tip/centos-create-user.md)
   - [Centos 安装桌面环境](tip/centos-install-gnome.md)
   - [Centos 安装KVM](tip/centos-install-kvm.md)
+  - [Centos 安装VNC](tip/centos-install-vnc.md)
   - [Centos 安装Pip](tip/centos-install-pip.md)
   - [Docker Compose](tip/docker-compose.md)
   - [FFmpeg](tip/ffmpeg.md)
-  - [Http Code](tip/http-code.md)
   - [Nginx 代理](tip/nginx-prefix.md)
   - [Nginx Rtmp](tip/nginx-rtmp.md)
   - [Nohup](tip/nohup.md)
+  - [NodeJs](tip/nodejs-upgrade.md)
+  - [Http Code](tip/http-code.md)
   - [String.format()](tip/string-format.md)
 - [关于项目](about.md)
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diff --git a/docs/tip/centos-install-kvm.md b/docs/tip/centos-install-kvm.md
index 582381493..fe9d81621 100644
--- a/docs/tip/centos-install-kvm.md
+++ b/docs/tip/centos-install-kvm.md
@@ -145,3 +145,85 @@ ifup ens3
 
 ### 常见指令
 
+KVM虚拟机的管理主要是通过virsh命令对虚拟机进行管理
+
+帮助文档
+```bash
+[root@localhost ~]# virsh --help
+```
+
+查看虚拟机状态
+```bash
+[root@localhost ~]# virsh list --all
+ Id    名称                         状态
+----------------------------------------------------
+ 4     win2k8r2                       running
+```
+关机
+```bash
+[root@localhost ~]# virsh shutdown win2k8r2
+```
+强制关闭电源
+```bash
+[root@localhost ~]# virsh destroy win2k8r2
+```
+通过配置文件创建虚拟机
+```bash
+[root@localhost ~]# virsh create /etc/libvirt/qemu/win2k8r2.xml
+```
+设置虚拟机开机自启
+```bash
+[root@localhost ~]# virsh autostart win2k8r2
+[root@localhost ~]# ll /etc/libvirt/qemu/autostart/
+总用量 0
+lrwxrwxrwx 1 root root 30 1月  24 13:06 win2k8r2.xml -> /etc/libvirt/qemu/win2k8r2.xml
+```
+到处虚拟机配置文件
+```bash
+[root@localhost ~]# virsh dumpxml win2k8r2 > /etc/libvirt/qemu/win2k8r2_bak.xml
+```
+删除虚拟机（该命令只删除配置文件，并不删除磁盘文件）
+```bash
+[root@localhost ~]# virsh undefine win2k8r2
+```
+通过导出备份的配置文件恢复原KVM虚拟机的定义，并重新定义虚拟机。
+```bash
+[root@localhost ~]# mv /etc/libvirt/qemu/win2k8r2_bak.xml /etc/libvirt/qemu/win2k8r2.xml
+[root@localhost ~]# virsh define /etc/libvirt/qemu/win2k8r2.xml
+```
+编辑配置文件
+```bash
+[root@localhost ~]# virsh edit win2k8r2
+```
+挂起
+```bash
+[root@localhost ~]# virsh suspend win2k8r2
+```
+恢复
+```bash
+[root@localhost ~]# virsh resume win2k8r2
+```
+创建存储卷
+```bash
+[root@localhost ~]# qemu-img create -f qcow2 /data/kvmstorage/centos7.qcow2 20G
+Formatting '/data/kvmstorage/centos7.qcow2', fmt=qcow2 size=21474836480 encryption=off cluster_size=65536 lazy_refcounts=off 
+[root@localhost ~]# ll //data/kvmstorage
+总用量 7437168
+-rw-r--r-- 1 root root      197120 1月  24 13:21 centos7.qcow2
+-rw------- 1 qemu qemu 42956488704 1月  24 13:21 win2k8r2.qcow2
+```
+生成虚拟机
+```bash
+[root@localhost ~]# virt-install --virt-type kvm --name centos --ram 1024 \
+  --disk /data/kvmstorage/centos7.qcow2,format=qcow2 \
+  --network bridge=br0 \
+  --graphics vnc,listen=0.0.0.0 --noautoconsole \
+  --os-type=linux --os-variant=rhel7 \
+  --location=/data/iso/CentOS-7-x86_64-Minimal-1804.iso
+
+[root@localhost ~]# virsh list --all
+ Id    名称                         状态
+----------------------------------------------------
+ 5     win2k8r2                       running
+ 7     centos                         running
+```
\ No newline at end of file
diff --git a/docs/tip/centos-install-vnc.md b/docs/tip/centos-install-vnc.md
new file mode 100644
index 000000000..edda7ff3a
--- /dev/null
+++ b/docs/tip/centos-install-vnc.md
@@ -0,0 +1,101 @@
+### 安装 VNC Server
+
+> ```bash
+> yum install tigervnc-server
+> ```
+
+
+
+### 配置 VNC Server 实例
+
+
+
+### root 用户
+
+> ```bash
+> cp /lib/systemd/system/vncserver@.service /etc/systemd/system/vncserver@:1.service
+> ```
+>
+> 修改拷贝之后的配置文件 `vncserver@:1.service` 中 [Service] 部分：
+>
+> ```bash
+> # /etc/systemd/system/vncserver@:1.service
+> 
+> [Service]
+> Type=forking
+> User=root
+> # Clean any existing files in /tmp/.X11-unix environment
+> ExecStartPre=-/usr/bin/vncserver -kill %i
+> ExecStart=/sbin/runuser -l root -c "/usr/bin/vncserver %i"
+> PIDFile=/root/.vnc/%H%i.pid
+> ExecStop=-/usr/bin/vncserver -kill %i
+> ```
+
+
+
+### 其他用户，例如：pnoker
+
+> ```bash
+> cp /lib/systemd/system/vncserver@.service /etc/systemd/system/vncserver@:2.service
+> ```
+>
+> 修改拷贝之后的配置文件 `vncserver@:2.service` 中 [Service] 部分，其中普通用户的ExecStart不同于root，加/sbin/runuser则会在启动服务时报以下错误：
+>
+> ```bash
+> # /etc/systemd/system/vncserver@:1.service
+> 
+> [Service]
+> Type=forking
+> User=pnoker
+> # Clean any existing files in /tmp/.X11-unix environment
+> ExecStartPre=-/usr/bin/vncserver -kill %i
+> ExecStart=/usr/bin/vncserver %i
+> PIDFile=/root/pnoker/.vnc/%H%i.pid
+> ExecStop=-/usr/bin/vncserver -kill %i
+> ```
+
+
+
+
+
+### 设置 VNC 密码
+
+> ```bash
+> vncpasswd    #root用户实例的vnc密码
+> su - pnoker
+> vncpasswd    #普通用户一定要切换到用户自己的环境下
+> ```
+>
+> 密码设置完成后回到root权限下，启动服务
+
+
+
+### 启动服务
+
+> ```bash
+> systemctl daemon-reload
+> systemctl start vncserver@:1.service
+> systemctl enable vncserver@:1.service 
+> 
+> #如果配置了其他用户还需要执行
+> systemctl start vncserver@:2.service
+> systemctl enable vncserver@:2.service 
+> ```
+
+
+
+## 防火墙设置
+
+> ```bash
+> firewall-cmd --zone=public --add-port=5901/tcp
+> firewall-cmd --zone=public --add-port=5902/tcp
+> firewall-cmd --reload
+> ```
+
+
+
+## 远程连接
+
+在其他电脑上安装 VNV Viewer 然后通过 主机地址，用户名，密码即可远程改Centos7系统。
+
+[VNV Viewer 下载地址](https://www.realvnc.com/en/connect/download/viewer/)
\ No newline at end of file
diff --git a/docs/tip/install-centos7.md b/docs/tip/install-centos7.md
new file mode 100644
index 000000000..35338d403
--- /dev/null
+++ b/docs/tip/install-centos7.md
@@ -0,0 +1,63 @@
+### 1.安装UltraISO
+
+> **下载地址**：[https://cn.ultraiso.net/uiso9_cn.exe](https://cn.ultraiso.net/uiso9_cn.exe)
+>
+> **激活**：
+>
+> - 注册名：Guanjiu    
+> - 注册码：A06C-83A7-701D-6CFC
+
+
+
+### 2.下载 Centos7 镜像
+
+> 以下载最新 centos7 镜像为例
+>
+> **下载地址**：[https://www.centos.org/centos-linux/](https://www.centos.org/centos-linux/)
+>
+> **版本**：以实际机器类型为主，例如x64架构，下载 `CentOS-7-x86_64-Everything-2009.iso`镜像
+
+
+
+### 3.制作启动U盘
+
+> **请将 U盘 安装以下配置进行格式化**
+>
+> - 文件系统：FAT32（默认）
+> - 至少10G以上
+> - 重要数据请提前备份好
+
+
+
+插入U盘，启动UltraISO，然后操作步骤，如图所示：
+
+
+
+- **3.1** 选择 '**文件**' -> '**打开**'，选择已经下载的 '**CentOS-7-x86_64-Everything-2009.iso**' 镜像
+
+![](../images/dc3/tip/tip-1.png)
+
+![](../images/dc3/tip/tip-2.png)
+
+
+
+- **3.2** 选择 '**启动**' -> '**写入硬盘映像...**'
+  - '**硬件驱动器**' 选择已经插入的 '**U盘**' 
+  - '**写入方式**' 选择 '**USB-HDD+**'
+  - 确认无误之后，点击 '**写入**'，该过程非常漫长，耐心等待完成即可
+
+![](../images/dc3/tip/tip-3.png)
+
+![](../images/dc3/tip/tip-4.png)
+
+![](../images/dc3/tip/tip-5.png)
+
+![](../images/dc3/tip/tip-6.png)
+
+![](../images/dc3/tip/tip-7.png)
+
+
+
+### 4.安装 Centos7 系统
+
+> 将制作好的 `Centos7` 启动 `U 盘` 插入到待安装的机器上，进入`BIOS` 设置从 `U盘` 启动，即可开始安装
\ No newline at end of file