Centos7 Ocserv安装使用用户名密码认证

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• How to fix ‘This file does not have a program associated with it’ error?

  By Eunice Samson |  August 15, 2018 | greater than 5 minutes

  It can be frustrating when you can’t open a file that holds the information that you urgently need. Some users complained that they had encountered this problem on Windows 10. When they tried to run some applications, they would get an error message which said, “This file does not have a program associated with it for performing this action.” Here are some issues related to the error:

  • The issue can affect different applications, including Excel, Explorer, and Adobe Reader, among others. When this happens to you, be sure to run SFC and DISM scans.
  • In some cases, the error message can appear while you’re trying to open a USB drive. Your AutoPlay settings likely caused this. You can try disabling the feature to fix this.
  • The error message can also prevent you from launching OneDrive. If you encounter this issue, you must learn how to set up file associations in Windows 10 correctly.
  • It is worth noting that the problem can affect not only Windows 10, but also older versions like Windows 8.1 and 7. Our solutions work best for Windows 10, but they can also be used for previous versions of the operating system.

  If you want to learn how to fix This file does not have a program associated with it issue on Windows 10, you’ve come to the right place. Go through our solutions to discover the one that will get rid of the error completely.

  Method 1: Creating a New Windows User Account

  Some users claimed that the there is an easy way to get rid of this error. They reported that creating a new Windows user account had fixed the problem. To do that, follow these instructions:

  1. Click the Search icon on your taskbar.
  2. Type “settings” (no quotes), then press Enter.
  3. Select Accounts.
  4. Go to the left-pane menu, then click Family & Other People.
  5. Click Add Someone Else to this PC.
  6. Select ‘I don’t have this person’s sign-in information.’
  7. Choose ‘Add a user without a Microsoft account.’
  8. Submit the necessary details to create a new account, then click Next.

  Method 2: Adding your User Account to the Administrators Group

  You can also try adding your user account to the Administrators group. Some users reported that this had helped them resolve the problem. You can add your user account to the Administrators group by following these steps:

  1. On your keyboard, press Windows Key+R. This should open the Run dialog box.
  2. Type “lusrmgr.msc” (no quotes), then press Enter.
  3. Go to the left-pane menu, then select the Groups folder.
  4. Go to the right pane, then double-click the Administrators group.
  5. Once the Properties window shows up, click the Add button.
  6. Click the box below the ‘Enter the object names’ section. Submit your username, then click Check Names. Click OK once everything is in order. You can also manually search for your username by clicking the Advanced button, then selecting Find Now.
  7. After following those steps, your account will be added to the Administrators group. Save the changes by clicking Apply and OK.

  It is also advisable to restart your computer to ensure that the changes will take effect.

  Method 3: Modifying your Registry

  Before you proceed, please be warned that the registry is a sensitive database. That said, making the smallest error can cause system instability. So, you should only try the following steps if you are confident that you will be able to complete the instructions successfully. We also recommend creating a backup of your registry. This way, you will be able to undo the changes in case anything goes wrong. Here are the steps in editing your registry:

  1. Press Windows Key+R on your keyboard to launch the Run dialog box.
  2. Type “regedit” (no quotes), then press Enter.
  3. Navigate to this path: \HKEY_CLASSES_ROOT\lnkfile
  4. Go to the right pane, then check if the IsShortcut value is available. If it is missing, click an empty space on the right pane, then select New and String Value. Make sure to name the new string value as IsShortcut.
  5. Once you’re done, close the registry editor.

  Some users recommended performing the following:

  1. Once the registry is up, navigate to this path: \HKEY_CLASSES_ROOT\CLSID\{20D04FE0-3AEA-1069-A2D8-08002B30309D}\shell\Manage\command
  2. Go to the right pane, then double-click (Default).
  3. Set the value data to: %SystemRoot%\system32\CompMgmtLauncher.exe
  4. Save the changes by clicking OK.

  Method 4: Removing Certain Keys from the Registry

  You can follow the steps in this solution if you are having trouble opening any folder on your computer. You must delete certain registry entries to fix the issue. Here are the steps:

  1. Open the Run dialog box by pressing Windows Key+R on your keyboard.
  2. Go to the left pane and navigate to this path: HKEY_CLASSES_ROOT\Directory\shell
  3. Expand the contents of the Shell key, then delete the Find and CMD keys.
  4. Once you’re done, exit the registry.

  Method 5: Performing SFC and DISM Scans

  In some cases, the file association error is caused by corrupted system files. There are various reasons why this happens, and it is advisable for you to perform SFC and DISM scans to get rid of it. Simply follow these instructions:

  1. On your keyboard, press Windows Key+X.
  2. Select Command Prompt (Admin) or PowerShell (Admin).
  3. Once Command Prompt is up, type “sfc /scannow” (no quotes), then press Enter.
  4. The SFC scan should now begin. The process may take around 15 minutes. So, just wait until it is complete and do not interrupt it.

  Once the SFC scan is finished, check if the error is gone. If it is still there, we recommend performing a DISM scan. Just follow these instructions:

  1. Run Command Prompt as an administrator.
  2. Type “DISM /Online /Cleanup-Image /RestoreHealth” (no quotes), then hit Enter.
  3. The DISM scan should now commence. Keep in mind that the process can take longer to complete.

  Once the DISM scan is finished, check if the problem persists.

  Method 6: Disabling AutoPlay

  As we’ve mentioned, the file association error may have something to do with your AutoPlay settings. So, you can try disabling the feature completely to fix the problem. To do that, simply follow these steps:

  1. On your keyboard, press Windows Key+S.
  2. Type “Settings” (no quotes), then hit Enter.
  3. Click Devices.
  4. Go to the left-pane menu, then click AutoPlay.
  5. Go to the right pane, then disable the ‘Use AutoPlay for all media devices’ option.
  6. Make sure that the Removable Drive and Memory Card are set to ‘Take no Action’.

  Method 7: Resetting File Association

  Windows is automatically set to open files, using its default programs. However, most users who prefer third-party applications tend to change these settings. Sometimes, doing this can lead to a string of errors, including the one we’re discussing in this article. So, you might ask, “How can I reset a file association?” Well, the process is simple. Just follow at the instructions below:

  1. Go to your taskbar and click the Search icon.
  2. Type “settings” (no quotes), then press Enter.
  3. Once the Settings window is open, click Apps.
  4. Go to the left-pane menu, then select Default Apps.
  5. Go to the right pane, then scroll down until you see the ‘Reset to the Microsoft recommended defaults’ section.
  6. Click the Reset button.

  Once you’ve completed these steps, you should be able to resolve the file association problem completely.

  If you notice that it still takes longer for applications or folders to open, it is possible that disk fragmentation caused the slowdown. In this case, we recommend usingAuslogics Disk Defrag Pro. The tool allows you to optimize file placement on your hard drive, ensuring the most efficient operation and faster access.

How To Host a Website with Caddy on CentOS 7

https://www.digitalocean.com/community/tutorials/how-to-host-a-website-with-caddy-on-centos-7

• curl -s https://getcaddy.com | bash

You can view the script by visiting https://getcaddy.com in your browser or downloading the file with wget or curl before you execute it.

• which caddy
• sudo adduser -r -d /var/www -s /sbin/nologin caddy
• sudo mkdir /etc/caddy
• sudo chown -R root:caddy /etc/caddy
• sudo touch /etc/caddy/Caddyfile
• sudo mkdir /etc/ssl/caddy
• sudo chown -R caddy:root /etc/ssl/caddy
• sudo chmod 0770 /etc/ssl/caddy
• sudo mkdir /var/www
• sudo chown caddy:caddy /var/www
• sudo curl -s https://raw.githubusercontent.com/mholt/caddy/master/dist/init/linux-systemd/caddy.service -o /etc/systemd/system/caddy.service
• sudo vi /etc/systemd/system/caddy.service
• /etc/systemd/system/caddy.service
• ; User and group the process will run as.
• User=caddy
• Group=caddy
• sudo systemctl daemon-reload
• sudo systemctl enable caddy.service
• sudo systemctl status caddy.service

·         systemctl status firewalld.service·         sudo firewall-cmd –list-all·         sudo firewall-cmd –add-port=465/tcp –permanent·         sudo firewall-cmd –add-port=20/ftp –permanent?

• sudo firewall-cmd –permanent –zone=public –add-service=http
• sudo firewall-cmd –permanent –zone=public –add-service=https
• sudo firewall-cmd –reload
• sudo vi /etc/caddy/Caddyfile
• /etc/caddy/Caddyfile
• com {
• root /var/www
• gzip
• tls sammy@example.com
• }
• sudo systemctl start caddy

 

 

• sudo yum install mariadb-server
• sudo systemctl start mariadb
• sudo systemctl status mariadb
• sudo systemctl enable mariadb
• sudo mysql_secure_installation
• mysqladmin -u root -p version
• sudo yum update
• sudo yum install php php-fpm php-mysql php-curl php-gd php-mbstring php-mcrypt php-xml php-xmlrpc
• php -v
• sudo vi /etc/php-fpm.d/www.conf
• /etc/php-fpm.d/www.conf
• ; Unix user/group of processes
• ; Note: The user is mandatory. If the group is not set, the default user’s group
• ; will be used.
• ; RPM: apache Choosed to be able to access some dir as httpd
• user = caddy
• ; RPM: Keep a group allowed to write in log dir.
• group = caddy
• sudo systemctl start php-fpm
• sudo systemctl enable php-fpm
• mysql -u root -p
• CREATE DATABASE wordpress DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
• GRANT ALL ON wordpress.* TO ‘wordpressuser’@’localhost’ IDENTIFIED BY ‘Password8*’;
• FLUSH PRIVILEGES;
• EXIT
• cd /var/www
• sudo curl -O https://wordpress.org/latest.tar.gz
• sudo tar zxf latest.tar.gz
• sudo rm latest.tar.gz
• sudo chown -R caddy:caddy wordpress
• sudo vi /etc/caddy/Caddyfile
• /etc/caddy/Caddyfile
• com {
• tls admin@example.com
• root /var/www/wordpress
• gzip
• fastcgi / 127.0.0.1:9000 php
• rewrite {
• if {path} not_match ^\/wp-admin
• to {path} {path}/ /index.php?_url={uri}
• }
• }
• sudo systemctl restart caddy

 

 

 

 

How To Install MariaDB on CentOS 7

https://www.digitalocean.com/community/tutorials/how-to-install-mariadb-on-centos-7

How To Install WordPress with Caddy on CentOS 7

https://www.digitalocean.com/community/tutorials/how-to-install-wordpress-with-caddy-on-centos-7#step-2-%E2%80%94-creating-a-mysql-database-and-dedicated-user

yum install lrzsz

一键安装最新内核并开启 BBR 脚本

wget –no-check-certificate https://github.com/teddysun/across/raw/master/bbr.sh && chmod +x bbr.sh && ./bbr.sh

使用方法

使用root用户登录，运行以下命令：

wget –no-check-certificate https://github.com/teddysun/across/raw/master/bbr.sh && chmod +x bbr.sh && ./bbr.sh

安装完成后，脚本会提示需要重启 VPS，输入 y 并回车后重启。
重启完成后，进入 VPS，验证一下是否成功安装最新内核并开启 TCP BBR，输入以下命令：

uname -r

查看内核版本，显示为最新版就表示 OK 了

sysctl net.ipv4.tcp_available_congestion_control

返回值一般为：
net.ipv4.tcp_available_congestion_control = bbr cubic reno
或者为：
net.ipv4.tcp_available_congestion_control = reno cubic bbr

sysctl net.ipv4.tcp_congestion_control

返回值一般为：
net.ipv4.tcp_congestion_control = bbr

sysctl net.core.default_qdisc

返回值一般为：
net.core.default_qdisc = fq

lsmod | grep bbr

返回值有 tcp_bbr 模块即说明 bbr 已启动。注意：并不是所有的 VPS 都会有此返回值，若没有也属正常。

CentOS 下最新版内核 headers 安装方法

本来打算在脚本里直接安装 kernel-ml-headers，但会出现和原版内核 headers 冲突的问题。因此在这里添加一个脚本执行完后，手动安装最新版内核 headers 之教程。
执行以下命令

yum –enablerepo=elrepo-kernel -y install kernel-ml-headers

根据 CentOS 版本的不同，此时一般会出现类似于以下的错误提示：

Error: kernel-ml-headers conflicts with kernel-headers-2.6.32-696.20.1.el6.x86_64Error: kernel-ml-headers conflicts with kernel-headers-3.10.0-693.17.1.el7.x86_64

因此需要先卸载原版内核 headers ，然后再安装最新版内核 headers。执行命令：

yum remove kernel-headers

确认无误后，输入 y，回车开始卸载。注意，有时候这么操作还会卸载一些对内核 headers 依赖的安装包，比如 gcc、gcc-c++ 之类的。不过不要紧，我们可以在安装完最新版内核 headers 后再重新安装回来即可。
卸载完成后，再次执行上面给出的安装命令。

yum –enablerepo=elrepo-kernel -y install kernel-ml-headers

成功安装后，再把那些之前对内核 headers 依赖的安装包，比如 gcc、gcc-c++ 之类的再安装一次即可。

为什么要安装最新版内核 headers 呢？
这是因为 shadowsocks-libev 版有个 tcp fast open 功能，如果不安装的话，这个功能是无法开启的。

内核升级方法

如果是 CentOS 系统，执行如下命令即可升级内核：

yum -y install kernel-ml kernel-ml-devel

如果你还手动安装了新版内核 headers ，那么还需要以下命令来升级 headers ：

yum -y install kernel-ml-headers

CentOS 6 的话，执行命令：

sed -i ‘s/^default=.*/default=0/g’ /boot/grub/grub.conf

CentOS 7 的话，执行命令：

grub2-set-default 0

如果是 Debian/Ubuntu 系统，则需要手动下载最新版内核来安装升级。
去这里下载最新版的内核 deb 安装包。
如果系统是 64 位，则下载 amd64 的 linux-image 中含有 generic 这个 deb 包；
如果系统是 32 位，则下载 i386 的 linux-image 中含有 generic 这个 deb 包；
安装的命令如下（以最新版的 64 位 4.12.4 举例而已，请替换为下载好的 deb 包）：

dpkg -i linux-image-4.12.4-041204-generic_4.12.4-041204.201707271932_amd64.deb

安装完成后，再执行命令：

/usr/sbin/update-grub

最后，重启 VPS 即可。