想要移动/boot分区时，首先使用（Gparted 这个软件，直接apt-get install gparted 就可以安装）
（1）使用gparted查看你的/boot分区挂载在哪个磁盘上
（2）之后使用mount 挂载你的目的磁盘
（3）将源/boot磁盘中的信息全都拷贝到你的目的磁盘中
（4）将源/boot磁盘unmount一下，并将目的磁盘mount到/boot目录下
（5）更新sudo grub-install –boot-directory=目的boot目录 /dev/sda
5.1 检查fstab
（6）reboot 查看是否更新成功
certbot renew
An unexpected error occurred:
ImportError: cannot import name constants
Please see the logfile ‘/tmp/tmpl4isIP/log’ for more details.
With the EPEL repository added to your CentOS installation, simply install the snapd package:
$ sudo yum install snapdOnce installed, the systemd unit that manages the main snap communication socket needs to be enabled:
$ sudo systemctl enable --now snapd.socketTo enable classic snap support, enter the following to create a symbolic link between /var/lib/snapd/snap and /snap:
$ sudo ln -s /var/lib/snapd/snap /snapRemove certbot-auto and any Certbot OS packages
If you have any Certbot packages installed using an OS package manager like apt, dnf, or yum, you should remove them before installing the Certbot snap to ensure that when you run the command certbot the snap is used rather than the installation from your OS package manager. The exact command to do this depends on your OS, but common examples are sudo apt-get remove certbot,
sudo dnf remove certbot, or sudo yum remove certbot.
If you previously used Certbot through the certbot-auto script, you should also remove its installation by following the instructions here.
Install CertbotRun this command on the command line on the machine to install Certbot.
sudo snap install --classic certbotPrepare the Certbot commandExecute the following instruction on the command line on the machine to ensure that the certbot command can be run.sudo
ln -s /snap/bin/certbot /usr/bin/certbot
Choose how you’d like to run Certbot
Either get and install your certificates…Run this command to get a certificate and have Certbot edit your Nginx configuration automatically to serve it, turning on HTTPS access in a single step.
sudo certbot --nginx
Or, just get a certificateIf you’re feeling more conservative and would like to make the changes to your Nginx configuration by hand, run this command.
sudo certbot certonly --nginx
Test automatic renewalThe Certbot packages on your system come with a cron job or systemd timer that will renew your certificates automatically before they expire. You will not need to run Certbot again, unless you change your configuration. You can test automatic renewal for your certificates by running this command:
sudo certbot renew --dry-run
The command to renew certbot is installed in one of the following locations:
三次握手后，GET请求发送1个包返回2个包（一个ACK，一个内容），应该是减少延时，先ACK后给内容，客户端收到内容后还要给服务端一个ACK
pip install https://download.lfd.uci.edu/pythonlibs/z4tqcw5k/Twisted-20.3.0-cp39-cp39-win_amd64.whl
装下 Twisted 即可 否则 ，需要下载庞大的vs来编译，还会失败
或者点击这个下载解压
pip install D:\Downloads\Twisted-20.3.0-cp39-cp39-win_amd64.whl
checking how to run the C++ preprocessor… /lib/cpp
configure: error: in `/tmp/pear/temp/pear-build-rootYPmYnu/swoole-4.5.9′:
configure: error: C++ preprocessor “/lib/cpp” fails sanity check
解决办法：
[root@xx xx]# yum install gcc-c++ glibc-headers
其中找到xdebug扩展加载处:
extension=xdebug.so
修改为：
zend_extension=xdebug.so
client_header_timeout 7d;
client_body_timeout 7d;
send_timeout 7d;
fastcgi_connect_timeout 7d;
fastcgi_read_timeout 7d;
fastcgi_send_timeout 7d;