Linux is an open-source operating system (OS). An operating system is software that directly manages a system’s hardware and resources, like CPU, memory, and storage. The OS sits between applications and hardware and makes the connections between all of your software and the physical resources that do the work. Here, at https://blog.eduguru.in, We will discuss and solve real-life problems coming on Linux OS. We also know more interesting features of Linux here.
What is Nagios? Nagios is a powerful monitoring system that enables organizations to identify and resolve IT infrastructure problems before they affect critical business processes. It has the capability of monitoring application, services, entire IT infrastructure. It has been designed with scalability and flexibility in mind, Nagios gives you the peace of mind that comes from … Read more
FTP command not found # ftp 192.168.1.56 -bash: ftp: command not found # yum -y install ftp The above command will install the ftp client package on your CentOS server. If you use a proxy server for internet access,
This script use to transfer file from linux to ftp server. You can automate this file transfer by putting this file in cronjob also. #!/bin/sh HOST=’ftp.users.qwest.net’ USER=’yourid’ PASSWD=’yourpw’ FILE=’file.txt’ ftp -n $HOST <<END_SCRIPT quote USER $USER quote PASS $PASSWD put $FILE quit END_SCRIPT exit 0 Please note that : Using the -n option on the ftp client … Read more
You need to create a shell scrip, needed to call from a crontab, to contact a FTP server and put or get a file. You will need to modify the variable section to reflect your settings. —————————————- #!/bin/bash HOST=ftp.server.com #This is the FTP servers host or IP address. USER=ftpuser #This is the FTP user that has access to the server. PASS=password #This is the password for the FTP user. # Uses the ftp command with the -inv switches. -i turns off interactive prompting. – Restrains FTP from attempting the auto-login feature. -v enables verbose and progress. ftp -inv $HOST
In all Operating system there option to schedule a job/activity that should be run on particular time interval. Here is an introduction to job scheduler in linux, called crontab. Cron allows tasks to run automatically in the background at fixed time or time intervals depending upon the necessity of the task that has to be … Read more
For Send mail Tutorial Click Here Need to be installed sendmail ( yum install sendmail) and mailx (yum install mailx) Create a shell script in linux. vi diskalert.sh #!/bin/sh support=”itsupport@xyz.com” # set alert level 90% is default ALERT=90 df -HP | grep -vE ‘^Filesystem|tmpfs|cdrom’ | while read partition size used free perc mnt ; … Read more
Check the Status of The Iptables IPv4 Firewall Run the following command to check the status of the iptables IPv4 firewall : # service iptables status Disable The Iptables Firewall Use the following commands to stop the Iptables Firewall and remove it from autostart. Disable The Iptables IPv4 Firewall Run the following commands to stop the iptables firewall … Read more
SSH- SECURE SHELL It is used to Connect to the remote system through secure shell. It giveyou a copy of remote shell on your desktop.You can also create password less login to the remote system with the help of PUBLIC/PRIVATE keys. 1.For installing SSH open the terminal and type :- # su <— to become root and enter the password> # yum install openssh-server 2. After the completion of … Read more
Mounting a Windows (cifs) share on centos gives us a “Mount.cifs cannot allocate memory” error. Executing a command like this: mount -t cifs //toad/Backup /media/backup -o user=username,password=password,iocharset=utf8,file_mode=0777,dir_mode=0777 We get an error like this: mount error(12): Cannot allocate memory Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) Solution: First, check the permissions on your shared … Read more
What is a runlevel ? Runlevel is the preset state in which a Linux system operates. Below mentioned are the different runlevels of a Linux system in which a linux system can be operated 0- halt or shutdown 1- single user mode 2- multi user mode without NFS 3- full multi-user mode 4- not used … Read more