nginx installation configuration
1. Check whether nginx is installed on this machine, use the following command:
#service nginx status
#which nginx
#whereis nginx
#find / -name "*nginx*"
#rpm -qa | grep nginx
2. Generally use yum to install, the command is as follows:
#yum install nginx
If successful, proceed to the next step to configure. If not successful, it may be that our nginx warehouse source address cannot be successfully linked. The solution is as follows:
Create a new file nginx.repo under /etc/yum.repos.d with the following content:
[nginx]
name=nginx repo
baseurl=http://nginx.org /packages/centos/$releasever/$basearch/
gpgcheck=0
enabled=1
Use yum to install again. The specific steps are as follows:#yum install nginx -y
yumThe default nginx installation address is :/etc/nginx
3. Configure the nginx file
a. Modify the /etc/nginx/nginx.conf file
Add content in the last line of http{} include /etc/ nginx/conf.d/demo_nginx.cnf;
b. Create a new file demo_nginx.cnf under /etc/nginx/conf.d/. The file content is as follows:
If it does not start successfully, please check the error log for analysis. Generally, there is a problem with the configuration file!# Load balancing
upstream demoApp{
server 10.10.10.40:8001;
server 10.10.10.40:8011;
}
#Set virtual host
server {
listen 80;
server_name 1 0.10.10.40;
root html;
location / {
proxy_redirect off;
’ proxy_pass http://demoApp;
}
#Dynamic requests must go through tomcat
location ~ .*.(jsp|action)$ {
proxy_set_header Host $host; proxy_set_header .(gif|jpg| jpeg|png|bmp|js|css|html)$ {
Deny all;
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root /usr/share/nginx/html;
}
access_log /var/log/ nginx/app.demo.com_access.log ;
}
4. Start nginx, the command is as follows:
#service nginx start
The error log directory is: /var/log/nginx/error.log
The above has introduced the installation and configuration of nginx, including the relevant aspects. I hope it will be helpful to friends who are interested in PHP tutorials.

In PHP, you can use session_status() or session_id() to check whether the session has started. 1) Use the session_status() function. If PHP_SESSION_ACTIVE is returned, the session has been started. 2) Use the session_id() function, if a non-empty string is returned, the session has been started. Both methods can effectively check the session state, and choosing which method to use depends on the PHP version and personal preferences.

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Managing concurrent session access in PHP can be done by the following methods: 1. Use the database to store session data, 2. Use Redis or Memcached, 3. Implement a session locking strategy. These methods help ensure data consistency and improve concurrency performance.

PHPsessionshaveseverallimitations:1)Storageconstraintscanleadtoperformanceissues;2)Securityvulnerabilitieslikesessionfixationattacksexist;3)Scalabilityischallengingduetoserver-specificstorage;4)Sessionexpirationmanagementcanbeproblematic;5)Datapersis

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Sessionlockingisatechniqueusedtoensureauser'ssessionremainsexclusivetooneuseratatime.Itiscrucialforpreventingdatacorruptionandsecuritybreachesinmulti-userapplications.Sessionlockingisimplementedusingserver-sidelockingmechanisms,suchasReentrantLockinJ

Alternatives to PHP sessions include Cookies, Token-based Authentication, Database-based Sessions, and Redis/Memcached. 1.Cookies manage sessions by storing data on the client, which is simple but low in security. 2.Token-based Authentication uses tokens to verify users, which is highly secure but requires additional logic. 3.Database-basedSessions stores data in the database, which has good scalability but may affect performance. 4. Redis/Memcached uses distributed cache to improve performance and scalability, but requires additional matching

Sessionhijacking refers to an attacker impersonating a user by obtaining the user's sessionID. Prevention methods include: 1) encrypting communication using HTTPS; 2) verifying the source of the sessionID; 3) using a secure sessionID generation algorithm; 4) regularly updating the sessionID.


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