moderator please merge these posts
an errata to my comment done on 2020-07-28 01:05 about tmpfs session dir...
the tmpfs directory i used to install session files is "/run" not "/tmp"... as /tmp is auto (or manual) deleted sometimes
Example #1 memcache扩展概览示例
在这个例子中，一个对象被保存到缓存中，又被取回。对象和其他非标量类型在存储 之前会先被序列化，因此它不可以用来存储资源类型（连接标记及其他）。（译注：请注意隐式的 资源类型存储，比如要保存的对象自身不是资源，但其中某个属性却是资源）
<?php
$memcache = new Memcache;
$memcache->connect('localhost', 11211) or die ("Could not connect");
$version = $memcache->getVersion();
echo "服务端版本信息: ".$version."<br/>\n";
$tmp_object = new stdClass;
$tmp_object->str_attr = 'test';
$tmp_object->int_attr = 123;
$memcache->set('key', $tmp_object, false, 10) or die ("Failed to save data at the server");
echo "将数据保存到缓存中（数据10秒后失效）<br/>\n";
$get_result = $memcache->get('key');
echo "从缓存中取到的数据:<br/>\n";
var_dump($get_result);
?>
Example #2 使用memcache的session处理器
<?php
$session_save_path = "tcp://$host:$port?persistent=1&weight=2&timeout=2&retry_interval=10, ,tcp://$host:$port ";
ini_set('session.save_handler', 'memcache');
ini_set('session.save_path', $session_save_path);
?>
moderator please merge these posts
an errata to my comment done on 2020-07-28 01:05 about tmpfs session dir...
the tmpfs directory i used to install session files is "/run" not "/tmp"... as /tmp is auto (or manual) deleted sometimes
memcached is great, is lightning fast, very versatile and useful, scalable, and is a must have for many projects
but if you only want speed to minimize session file blocking there is also a good alternative, tmpfs
https://eddmann.com/posts/storing-php-sessions-file-caches-in-memory-using-tmpfs/
maybe if you are in debian you already had session directory in tmp (mounted as tmpfs), but beware of daily cleaning process that can mess up your sessions
you can use this trick if you are in centos/other (like me) or even if you are in debian but want to get ride of /tmp cleaning task
i realized in my system /run is also mounted as tmpfs, so i shut php-fpm down, moved my php session dir to /tmp/, reconfigure php and start again... (you can adapt it to your situation)
systemctl stop php-fpm
cp -a /var/lib/php/session /tmp/php-session
vim /etc/php-fpm-d/www.conf
------
php_value[session.save_path] = /run/php-session
------
systemctl start php-fpm
the only drawback is tmpfs is VOLATILE, just like memcached (data is lost on unmount/shutdown/power fail), to circumvent this risk i wrote another service that restores/backup php session dir before/after php starts/stops... (UNTESTED!)
vim /etc/systemd/system/php-session-backup.service
------
# basic persistence for tmpfs php sessions
[Unit]
Description=PHP tmpfs sessions backup/restore on shutdown/boot
Before=php-fpm.service
[Service]
Type=oneshot
RemainAfterExit=true
ExecStart=rm -fr /run/php-session
ExecStart=cp -fa /var/lib/php/session /run/php-session
ExecStop=rm -fr /var/lib/php/session
ExecStop=cp -fa /run/php-session /var/lib/php/session
[Install]
WantedBy=multi-user.target
------
systemctl enable php-session-backup
you can also complement this with a daily backup task in case of system crash so you will lose just one day
crontab -e
------
0 4 * * * rm -fr /var/lib/php/session;cp -fa /run/php-session /var/lib/php/session
------
this is very rough though, you can better use inotify + rsync, could take some ideas from here
https://blog.jmdawson.co.uk/persistent-ramdisk-on-debain-ubuntu/
If the example doesn't work try to change "localhost" to "127.0.0.1".