Server environment
1 | $ cat /etc/issue |
Session in PHP has two problem in a web project.
- If cookie is disable in client browser
- How to synchronize session
Session base usage in PHP
1 | session_start(); //Start session |
Different sub-domains direct to the same server:
There are three way to do this.
- Add this code at the beginning of the php page (before any output and before the method session_start() )
1 | ini_set('session.cookie_path', '/'); |
or1
session_set_cookie_params(1800 , '/', '.mydomain.com');
- Point to domain forever in php configuration file php.ini:
1
2
3session.cookie_path = /
session.cookie_domain = .mydomain.com
session.cookie_lifetime = 1800
The above methods have the same effect.
Different sub-domains direct to different server:
Use NFS to share session
- If session number is relatively large and all session files are under the same directory
- If NFS Server get malfunction
- If NFS network can not be connected
It may causes a serious load problem
There will be three server machine
| NFS | Hostname | IP |
|---|---|---|
| Server | site1 | 192.168.33.10 |
| Client | site2 | 192.168.33.11 |
| Client | site3 | 192.168.33.12 |
Step 1. Change PHP session storage directory
Step 2. Install NFS on each server machine
Step 3. NFS clients mount to the main server then share the main server ‘s session directory
Server
Use /tmp/php_sess as the session sharing directory
1 | $ mkdir /tmp/php_sess |
Direct php session save path to redis
1 | $ sudo vim /etc/php/5.6/apache2/php.ini |
Restart apache
1 | $ sudo service apache2 restart |
Install NFS client1
$ sudo apt-get install -y nfs-kernel-server
Limit NFS client connecting ip1
2
3$ sudo vim /etc/exports
/tmp/php_sess 192.168.33.11(rw,sync,no_root_squash,no_subtree_check)
/tmp/php_sess 192.168.33.12(rw,sync,no_root_squash,no_subtree_check)
Restart NFS service1
$ sudo service nfs-kernel-server restart
Client
Use /tmp/php_sess as the session sharing directory
1 | $ mkdir /tmp/php_sess |
Install NFS client1
$ sudo apt install -y nfs-common
Show NFS server info1
2
3$ sudo showmount -e 192.168.33.10
Export list for 192.168.33.10:
/tmp/php_sess 192.168.33.12,192.168.33.11
Mount the directory1
$ sudo mount 192.168.33.10:/tmp/php_sess /tmp/php_sess
Check NFS mount result1
$ ls -lh /tmp/php_sess/
Direct php session save path to redis
1 | $ sudo vim /etc/php/5.6/apache2/php.ini |
Restart apache1
$ sudo service apache2 restart
Mount NFS share directory automatically as machine boot1
2$ sudo vim /etc/fstab
192.168.33.10:/tmp/php_sess /tmp/php_sess nfs auto,nofail,noatime,nolock,intr,tcp,actimeo=1800 0 0
Different domains direct to different server:
Install redis
1 | $ sudo apt-get install -y redis-server |
Bind redis ip1
2$ sudo vim /etc/redis/redis.conf
bind 192.168.33.10
Restart redis1
$ sudo service redis-server restart
Install php-redis extension1
$ sudo apt-get install -y php5.6-redis
Direct the session save path to redis in php1
2
3$ sudo vim /etc/php/5.6/apache2/php.ini
session.save_handler = Redis
session.save_path = "tcp://192.168.33.10:6379"
Restart apache1
$ sudo service apache2 restart
