How to analyze nginx error log
1. Log introduction
There are two main types of nginx logs: access logs and error logs. The access log mainly records every request from the client to access nginx, and the format can be customized; the error log mainly records the log when the client accesses nginx and an error occurs, and the format does not support customization. Both logs can be optionally turned off.
Through the access log, you can get relevant information such as the user’s geographical origin, jump source, terminal usage, number of visits to a certain URL; through the error log, you can You can get the performance bottleneck of a certain service or server in the system, etc. Therefore, by making good use of logs, you can get a lot of valuable information.
2. Access log
[Access.log]
log_format main '$remote_addr $remote_user [$time_local] "$request" $http_host '
'$status $upstream_status $body_bytes_sent "$http_referer" '
# '"$ http_user_agent" $ SSL_PROTOCOL $ SSL_CIPHER $ upstream_addr'
'$ Requesst_Time $ Upstream_time_time
##Variable name
|
Variable description
| Examples
|
|||||||||||||||||||||||||||||||||||||||||||||||||||
##$remote_addr Client address |
##113.140.15.90 | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Client user name |
- | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Visit Time and time zone |
##18/Jul/2012:17:00:01 0800 |
||||||||||||||||||||||||||||||||||||||||||||||||||||
Requested URI and |
HTTP Protocol"GET /pa/img/home/logo-alipay-t.png HTTP/1.1 " |
##$http_host |
|||||||||||||||||||||||||||||||||||||||||||||||||||
Request address, that is, the address you enter in the browser (IP or domain name) |
img.alipay .com |
10.253.70.103 ##$status |
HTTPRequest Status |
##200 |
|||||||||||||||||||||||||||||||||||||||||||||||||
##$upstream_status |
##upstream Status | ##200||||||||||||||||||||||||||||||||||||||||||||||||||||
The size of the file content sent to the client |
547 | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Jump source |
"https://cashier.alip | ay.com.../" #$http_user_agent |
|||||||||||||||||||||||||||||||||||||||||||||||||||
User Terminal Agent |
"Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; SV1; GTB7.0; .NET4.0C ; | ##$ssl_protocol |
|||||||||||||||||||||||||||||||||||||||||||||||||||
SSLProtocol Version |
TLSv1 |
$ssl_cipher |
|||||||||||||||||||||||||||||||||||||||||||||||||||
##Algorithms in exchange data RC4-SHA |
##$upstream_addr |
||||||||||||||||||||||||||||||||||||||||||||||||||||
upstream, that is, the host address that actually provides services |
10.228.35.247:80 |
#$request_time |
|||||||||||||||||||||||||||||||||||||||||||||||||||
0.205 |
$upstream_response_time |
||||||||||||||||||||||||||||||||||||||||||||||||||||
upstream Response time |
0.002 ##
Online example: 116.9.137.90 - [02/Aug/2012:14:47:12 0800] " GET /images/XX/20100324752729.png HTTP/1.1"img.alipay.com 200 200 2038 https://cashier.alipay.com/XX/PaymentResult.htm?payNo=XX&outBizNo=2012XX "Mozilla /4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; Tablet PC 2.0; 360SE) " TLSv1 AES128-SHA 10.228.21.237:80 0.198 0.001
Offline test ($http_referer): 10.14.21.197 - - [14/Aug/2012:17:28:22 0800] "GET /spanner /watch/v1?--db=ztg-1&--mode=compare&--index=status&--option=&--cluster=whole&-F=2012/8/12-00:00:00&-T=+ 2880&-i=1&-n=0&_=1344936501292 HTTP/1.1" 200 94193 "http://spanner.alipay.net/optionFrame/history.html" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.60 Safari/537.1" ##Remarks: $http_referer is related to redirection.
Offline test ($http_host): Note: The value of $http_host is related to the value you enter in the browser. 3. Error log
For more Nginx related technical articles, please visit the Nginx Tutorial column to learn! |
The above is the detailed content of How to analyze nginx error log. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

To allow the Tomcat server to access the external network, you need to: modify the Tomcat configuration file to allow external connections. Add a firewall rule to allow access to the Tomcat server port. Create a DNS record pointing the domain name to the Tomcat server public IP. Optional: Use a reverse proxy to improve security and performance. Optional: Set up HTTPS for increased security.

Steps to run ThinkPHP Framework locally: Download and unzip ThinkPHP Framework to a local directory. Create a virtual host (optional) pointing to the ThinkPHP root directory. Configure database connection parameters. Start the web server. Initialize the ThinkPHP application. Access the ThinkPHP application URL and run it.

To solve the "Welcome to nginx!" error, you need to check the virtual host configuration, enable the virtual host, reload Nginx, if the virtual host configuration file cannot be found, create a default page and reload Nginx, then the error message will disappear and the website will be normal show.

There are five methods for container communication in the Docker environment: shared network, Docker Compose, network proxy, shared volume, and message queue. Depending on your isolation and security needs, choose the most appropriate communication method, such as leveraging Docker Compose to simplify connections or using a network proxy to increase isolation.

To register for phpMyAdmin, you need to first create a MySQL user and grant permissions to it, then download, install and configure phpMyAdmin, and finally log in to phpMyAdmin to manage the database.

Server deployment steps for a Node.js project: Prepare the deployment environment: obtain server access, install Node.js, set up a Git repository. Build the application: Use npm run build to generate deployable code and dependencies. Upload code to the server: via Git or File Transfer Protocol. Install dependencies: SSH into the server and use npm install to install application dependencies. Start the application: Use a command such as node index.js to start the application, or use a process manager such as pm2. Configure a reverse proxy (optional): Use a reverse proxy such as Nginx or Apache to route traffic to your application

Converting an HTML file to a URL requires a web server, which involves the following steps: Obtain a web server. Set up a web server. Upload HTML file. Create a domain name. Route the request.

Troubleshooting steps for failed phpMyAdmin installation: Check system requirements (PHP version, MySQL version, web server); enable PHP extensions (mysqli, pdo_mysql, mbstring, token_get_all); check configuration file settings (host, port, username, password); Check file permissions (directory ownership, file permissions); check firewall settings (whitelist web server ports); view error logs (/var/log/apache2/error.log or /var/log/nginx/error.log); seek Technical support (phpMyAdmin
