php7.4 mysqli times out with “gone away”

问题

I have just installed php7.4, everything seems ok but when I try to go on my phpmyadmin, I can't : Note works fine in php7.3 before this installation

The error is :

mysqli_real_connect(): Unexpected server response while doing caching_sha2 auth: 109
 mysqli_real_connect(): (HY000/2006): MySQL server has gone away

looking my php mysql library :php7.4-mysql. it's installed.

Forget something ? Thank you.

NOTICE: Not enabling PHP 7.4 FPM by default.
NOTICE: To enable PHP 7.4 FPM in Apache2 do:
NOTICE: a2enmod proxy_fcgi setenvif
NOTICE: a2enconf php7.4-fpm
NOTICE: You are seeing this message because you have apache2 package installed.
Traitement des actions différées (« triggers ») pour libapache2-mod-php7.4 (7.4.
0-1+ubuntu19.10.1+deb.sury.org+1) ...

apt-cache policy php7.4
php7.4:
  Installé : 7.4.0-1+ubuntu19.10.1+deb.sury.org+1
  Candidat : 7.4.0-1+ubuntu19.10.1+deb.sury.org+1
 Table de version :
 *** 7.4.0-1+ubuntu19.10.1+deb.sury.org+1 500
        500 http://ppa.launchpad.net/ondrej/php/ubuntu eoan/main amd64 Packages
        500 http://ppa.launchpad.net/ondrej/php/ubuntu eoan/main i386 Packages
        100 /var/lib/dpkg/status

回答1:

If you still use the dated mysql_native_password method, which is HIGHLY DISCOURAGED as it is considered less secure, you could set the default authentication plug-in to native password by adding default_authentication_plugin = mysql_native_password to the [mysqld] section of my.cnf.

回答2:

I had the same issue, but using mysql_native_password was not possible with PHP7.4-mysql-pdo, even on setting in my.cnf as it worked on PHP7.3-mysql-pdo.

I had to alter every user with this query:

ALTER USER 'username'@'localhost' IDENTIFIED WITH caching_sha2_password BY 'password';

where username is the database username and password is the password of the database user.

回答3:

In file /etc/mysql/my.cnf

After [mysqld] add: default-authentication-plugin = mysql_native_password

Example of my /etc/mysql/my.cnf

[mysqld]
user   = mysql
pid-file = /var/run/mysqld/mysqld.pid
socket   = /var/run/mysqld/mysqld.sock
port   = 3306
basedir    = /usr
datadir    = /var/lib/mysql
tmpdir   = /tmp
lc-messages-dir  = /usr/share/mysql
log-error    = /var/log/mysql/error.log
explicit_defaults_for_timestamp

bind-address = 0.0.0.0

# PHP 7.4 Fix
default-authentication-plugin = mysql_native_password

# Recommended in standard MySQL setup
sql_mode = "STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION"

# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

And remember use mysql_native_password not good because of security.

回答4:

you can change the encryption of the password like this.

ALTER USER 'yourusername'@'localhost' IDENTIFIED WITH mysql_native_password BY 'youpassword';

来源：https://stackoverflow.com/questions/59120368/php7-4-mysqli-times-out-with-gone-away

标签

php

mysql

php-7.4