Sysctl Command and Linux Kernel Parameter Tuning 1. The sysctl command is used to configure and display kernel parameters in the /proc/sys directory. To persist the parameters, you can edit the /etc/sysctl.conf file. Command format: sysctl [-n] [-e] -w variable=value …
nf_conntrack operates at Layer 3, supporting both IPv4 and IPv6, whereas ip_conntrack only supports IPv4.
Currently, most ip_conntrack_* has been replaced by nf_conntrack_*, with many ip_conntrack_* merely serving as an alias. The original ip_conntrack’s /proc/sys/ne …
Error Cause: The command netstat -nat|grep -i “80″|wc -l # netstat -nat|grep -i “80″|wc -l netstat -an prints the current network connection status of the system, while grep -i “80″ is used to filter connections related to port 80 …
In Linux systems, this virtual memory is called SWaP. During OS installation, the setup wizard prompts the user to specify how much SWaP space to create. When installing Oracle 10g on a Linux system, we found that the SWaP partition was too small and needed to be manually expanded …
An in-depth guide to the Linux tail command, covering basic usage, real-time log monitoring with -f, and advanced filtering options.
If you connect to an FTP server using FileZilla’s default settings, you may encounter the following errors:
Error: Failed to establish data connection: ECONNREFUSED – Connection refused by server
Error: Connection timed out
Error: Failed to retrieve directory listing
The fix is to change the transfer mode to …
Nginx SSL certificate installation requires two configuration files: 1_root_bundle.crt and 2_domainname.com.key.
Note: These certificate files are located in the folder for Nginx.zip.
Example: 1_root_bundle.crt is the root certificate chain (public key), and 2_domainname.com.key is the private key. (Where: the certificate public …
DROP TABLE IF EXISTS `documents`;
CREATE TABLE IF NOT EXISTS `documents` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`title` varchar(255) NOT NULL,
`content` text NOT NULL,
`date_adde …
Guide to using the LNMP one-click installation package for setting up Linux, Nginx, MySQL, and PHP stack on your server.
Note: Basic firewall operation commands: Check firewall status: [root@localhost ~]# service iptables status
