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Test connectivity for the web service: Difference between revisions
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Test connectivity for the web service (edit)
Revision as of 17:41, 28 January 2025
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Find the problem occurred: (1) local service at the server (localhost) (2) from LAN to server (3) from WAN to server | |||
{{LanguageSwitcher | content = [[Test connectivity for the web service | EN]], [[網路服務連線測試 | 漢字]] }} | |||
=== How to connect to the web service === | === How to connect to the web service === | ||
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# {{kbd | key = telnet 127.0.0.1 <PORT>}} If failed to connect the web service. It will show the message: "telnet: Unable to connect to remote host: Connection refused" | # {{kbd | key = telnet 127.0.0.1 <PORT>}} If failed to connect the web service. It will show the message: "telnet: Unable to connect to remote host: Connection refused" | ||
Using alternative web services if the Python was installed | Using alternative web services if the Python or Node.js was installed | ||
* (for python | |||
* (for | * (for python 3.x) {{kbd | key=<nowiki>python -m http.server [port]</nowiki>}} (default port: 8000)<ref>[https://docs.python.org/3.8/library/http.server.html?highlight=http%20server#module-http.server http.server — HTTP servers — Python 3.8.1 documentation]</ref> | ||
* (for Node.js) {{kbd | key=<nowiki>npx http-server [-p port]</nowiki>}} (default port: 8080)<ref>[https://github.com/http-party/http-server http-server: a simple static HTTP server]</ref> | |||
== Test connectivity for the local web service == | == Test connectivity for the local web service == | ||
WAN ○ -------> ○ LAN -------> <span style="color:red">● server</span> | WAN ○ -------> ○ LAN -------> <span style="color:red">● server</span> | ||
{{Tips}} If you has administrative permission to log into the server via SSH or Remote desktop service. | |||
=== Check if your computer/server Is being assigned the IP Address === | === Check if your computer/server Is being assigned the IP Address === | ||
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* More on [[Network problem]] | * More on [[Network problem]] | ||
=== | === Check if web service has started successfully? === | ||
* Apache {{kbd | key = /etc/init.d/httpd status}} on CentOS7 <ref>[https://www.e2enetworks.com/help/knowledge-base/how-to-check-running-status-of-lamp-stack/ How to check running status of LAMP stack | E2E Networks Knowledgebase]</ref> | * Apache {{kbd | key = /etc/init.d/httpd status}} on CentOS7 <ref>[https://www.e2enetworks.com/help/knowledge-base/how-to-check-running-status-of-lamp-stack/ How to check running status of LAMP stack | E2E Networks Knowledgebase]</ref> | ||
* nginx {{kbd | key = sudo service nginx status}} on CentOS7 | * nginx {{kbd | key = sudo service nginx status}} on CentOS7 | ||
* Docker container {{kbd | key = docker ps}} to check if the container is running & expose the port<ref>[https://docs.docker.com/engine/reference/commandline/ps/ docker ps | Docker Documentation]</ref> | * Docker container {{kbd | key = docker ps}} to check if the container is running & expose the port<ref>[https://docs.docker.com/engine/reference/commandline/ps/ docker ps | Docker Documentation]</ref> | ||
=== Check if MySQL has started successfully? === | |||
==== Using lsof command ==== | |||
* {{kbd | key = lsof -i:3306}} on {{Mac}} or {{Linux}} | |||
The command lsof -i:3306 is used in Unix-like operating systems to list open files and the processes that opened them. Let's break down the command: | |||
lsof: This stands for "List Open Files". It's a command-line utility that displays information about files opened by processes. In Unix and Linux, everything is treated as a file (including hardware devices, sockets, and directories), so lsof is a powerful tool for system administrators to monitor and troubleshoot system behavior. | |||
-i: This option tells lsof to show only network files. In Unix and Linux, network connections are treated as files. The -i option can be used to filter connections based on the Internet address or network protocol. | |||
:3306: This specifies the port number. Port 3306 is commonly used by MySQL, a popular database management system. By including :3306, you are asking lsof to list all network files (which includes socket connections) that are associated with port 3306. | |||
Example output: localhost:mysql (LISTEN) means the MySQL has started successfully | |||
<pre> | |||
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME | |||
mysqld 93034 account 29u IPv4 0xxxx 0t0 TCP localhost:mysql (LISTEN) | |||
</pre> | |||
==== Using ps command ==== | |||
* {{kbd | key = <nowiki>ps aux | grep mysql</nowiki>}} on {{Mac}} | |||
Example output if MySQL has started successfully: | |||
<pre> | |||
_mysql 11083 0.3 0.2 409657280 31424 ?? Ss 2:12下午 0:01.07 /usr/local/mysql/bin/mysqld --user=_mysql --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --plugin-dir=/usr/local/mysql/lib/plugin --log-error=/usr/local/mysql/data/mysqld.local.err --pid-file=/usr/local/mysql/data/mysqld.local.pid --keyring-file-data=/usr/local/mysql/keyring/keyring --early-plugin-load=keyring_file=keyring_file.so | |||
ACCOUNT 12349 0.0 0.0 408645328 1648 s011 S+ 2:14下午 0:00.00 grep mysql | |||
</pre> | |||
Example output if MySQL has NOT started successfully: | |||
<pre> | |||
ACCOUNT 12349 0.0 0.0 408645328 1648 s011 S+ 2:14下午 0:00.00 grep mysql | |||
</pre> | |||
=== Check if a port was occupied by other process? === | === Check if a port was occupied by other process? === | ||