bbr:
`wget -N --no-check-certificate "https://raw.githubusercontent.com/chiakge/Linux-NetSpeed/master/tcp.sh" && chmod +x tcp.sh && ./tcp.sh`
v2ray:
自动：
`bash <(curl -s -L https://raw.githubusercontent.com/xyz690/v2ray/master/go.sh)`
手动:
`bash <(curl -s -L https://raw.githubusercontent.com/xyz690/v2ray/master/install.sh)`
`bash <(curl -sL https://raw.githubusercontent.com/hiifeng/v2ray/main/install_v2ray.sh)`
x-ui面板：
`bash <(curl -Ls https://raw.githubusercontent.com/vaxilu/x-ui/master/install.sh)`

上网咯

`sudo apt install rdesktop`
rdesktop -f 192.168.33.134
```
➜ ~ ➤ rdesktop --help
rdesktop：无效选项 -- -
rdesktop: A Remote Desktop Protocol client.
Version 1.7.1. Copyright (C) 1999-2011 Matthew Chapman et al.
See https://www.rdesktop.org/ for more information.

Usage: rdesktop [options] server[:port]
   -u: user name
   -d: domain
   -s: shell
   -c: working directory
   -p: password (- to prompt)
   -n: client hostname
   -k: keyboard layout on server (en-us, de, sv, etc.)
   -g: desktop geometry (WxH)
   -f: full-screen mode
   -b: force bitmap updates
   -L: local codepage
   -A: enable SeamlessRDP mode
   -B: use BackingStore of X-server (if available)
   -e: disable encryption (French TS)
   -E: disable encryption from client to server
   -m: do not send motion events
   -C: use private colour map
   -D: hide window manager decorations
   -K: keep window manager key bindings
   -S: caption button size (single application mode)
   -T: window title
   -N: enable numlock syncronization
   -X: embed into another window with a given id.
   -a: connection colour depth
   -z: enable rdp compression
   -x: RDP5 experience (m[odem 28.8], b[roadband], l[an] or hex nr.)
   -P: use persistent bitmap caching
   -r: enable specified device redirection (this flag can be repeated)
         '-r comport:COM1=/dev/ttyS0': enable serial redirection of /dev/ttyS0 to COM1
             or      COM1=/dev/ttyS0,COM2=/dev/ttyS1
         '-r disk:floppy=/mnt/floppy': enable redirection of /mnt/floppy to 'floppy' share
             or   'floppy=/mnt/floppy,cdrom=/mnt/cdrom'
         '-r clientname=<client name>': Set the client name displayed
             for redirected disks
         '-r lptport:LPT1=/dev/lp0': enable parallel redirection of /dev/lp0 to LPT1
             or      LPT1=/dev/lp0,LPT2=/dev/lp1
         '-r printer:mydeskjet': enable printer redirection
             or      mydeskjet="HP LaserJet IIIP" to enter server driver as well
         '-r sound:[local[:driver[:device]]|off|remote]': enable sound redirection
                     remote would leave sound on server
                     available drivers for 'local':
                     alsa:  ALSA output driver, default device: default
         '-r clipboard:[off|PRIMARYCLIPBOARD|CLIPBOARD]': enable clipboard
                      redirection.
                      'PRIMARYCLIPBOARD' looks at both PRIMARY and CLIPBOARD
                      when sending data to server.
                      'CLIPBOARD' looks at only CLIPBOARD.
         '-r scard[:"Scard Name"="Alias Name[;Vendor Name]"[,...]]
          example: -r scard:"eToken PRO 00 00"="AKS ifdh 0"
                   "eToken PRO 00 00" -> Device in Linux/Unix enviroment
                   "AKS ifdh 0"       -> Device shown in Windows enviroment 
          example: -r scard:"eToken PRO 00 00"="AKS ifdh 0;AKS"
                   "eToken PRO 00 00" -> Device in Linux/Unix enviroment
                   "AKS ifdh 0"       -> Device shown in Windows enviroment 
                   "AKS"              -> Device vendor name                 
   -0: attach to console
   -4: use RDP version 4
   -5: use RDP version 5 (default)
➜ ~ ➤```

linux rdp远程桌面连接Windows

### 使用指定mysql账户连接mysql服务器：
`mysql -u <username> -p`
### mysql账户更改密码：
`ALTER USER 'username'@'hostname' IDENTIFIED BY 'new_password';`
如
`ALTER USER 'hadoop'@'ubuntu1' IDENTIFIED BY '123456';`

### 将mysql中hadoop用户的host改为localhost

要将 MySQL 中名为 hadoop 的用户账户的主机名从远程主机更改为 localhost，您可以按照以下步骤操作：

打开 MySQL 客户端。您可以使用以下命令连接到 MySQL 服务器：

`mysql -u <username> -p`
其中 <username> 是具有足够权限的 MySQL 用户名。在按 Enter 键后，系统会提示您输入密码。

在成功登录后，使用以下命令来检查 hadoop 用户当前的主机名：

`SELECT User, Host FROM mysql.user WHERE User='hadoop';`
您应该看到一个包含 hadoop 用户及其当前主机名的表格。

使用以下命令将 hadoop 用户的主机名更改为 localhost：

`UPDATE mysql.user SET Host='localhost' WHERE User='hadoop' AND Host='<hostname>';`
其中 <hostname> 是 hadoop 用户当前所属的主机名或 IP 地址。如果 hadoop 用户已经使用 localhost 进行访问，则可以省略 AND Host='<hostname>' 部分。

更新完 hadoop 用户的主机名后，请务必刷新 MySQL 权限表以使更改生效：

`FLUSH PRIVILEGES;`
在完成操作后，您可以使用以下命令退出 MySQL 客户端：

`exit;`
请注意，如果您将用户账户的主机名更改为 localhost，则只能从本地主机访问该账户。如果需要从其他主机远程访问该账户，请将主机名更改为实际的主机名或 IP 地址。









mysql账户操作

本文档中ubunt1为主 23为备
1.修改/etc/hosts
将多个备份节点加入进去
```
127.0.0.1 localhost
127.0.1.1 ubuntu1
192.168.33.102 ubuntu2
192.168.33.103 ubuntu3
```
2.ssh-keygen生成秘钥
3.ssh-copy-id root@ubuntu2 #将公钥传给ubuntu2
4.连接root@ubuntu2
ssh root@ubuntu2

