Analysis of the meaning of error code in Debian Node.js log

When using Node.js on Debian systems, error codes in the log can help developers quickly locate and resolve problems. Here are some common Node.js error codes and their meanings:

1. EPERM : Operation is not allowed. This is usually due to permission issues, such as not having enough permissions when trying to create a log directory.

2. ENOENT : There is no such file or directory. This means that the file or directory attempted to access or create does not exist.

3. EISDIR : is a directory. This usually happens when trying to process files as directories.

4. EADDRINUSE : The address is already in use. This means that the port Node.js attempts to bind has been occupied by other processes.

5. ECONNRESET : The connection is reset by the remote host. This usually happens in a network connection, such as an unexpected disconnection on the client or server side.

6. EPIPE : Pipe ruptured. This usually occurs in a read-write stream, such as trying to write to a closed stream.

7. ENOTFOUND : The domain name was not found. This usually occurs when DNS resolution fails, such as attempting to connect to a non-existent domain name.

8. EAI_NONAME : DNS resolution failed and the host name was not found. This is also caused by DNS resolution problems.

9. ECONNREFUSED : The connection was rejected. This usually happens when trying to connect to a service that is not running on the specified port.

10. ETIMEDOUT : The operation timed out. This means that the network operation was not completed within the specified time.

11. EWOULDBLOCK : The operation will block. This usually occurs in non-blocking operations, such as trying to read or write a stream that does not have data immediately.

12. EPROTO : Protocol error. This usually occurs in network communications, such as a protocol error during data transmission.

13. EILSEQ : Illegal character sequence. This usually occurs in string processing, such as when parsing JSON or other text formats, encountering illegal characters.

14. EFBIG : The file is too large. This usually happens when trying to read or write a very large file.

15. ENFILE : Too many open files. This means that the system has opened too many files and cannot open new files.

16. EMFILE : Too many file descriptors. This usually happens when too many file descriptors are used in the Node.js process to no longer allocate new file descriptors.

Understanding these error codes and their meaning can help developers quickly and appropriate solutions when they encounter problems. For example, if you encounter an EPERM error, you may need to check the permission settings of files and directories; if it is an ECONNREFUSED error, you may need to check whether the target port is occupied or whether the service is running normally. In this way, problems in Node.js applications can be more efficiently diagnosed and resolved.

The above is the detailed content of Analysis of the meaning of error code in Debian Node.js log. For more information, please follow other related articles on the PHP Chinese website!