This post explains how to disable rpc.quotad service on CentOS/RHEL 6 or 7 machines. The protocol used by rpc.rquotad is an unsecured and obsolete protocol and should be disabled. Note: This procedure can disrupt NFS clients relying on disk quotas. To avoid issues, schedule a maintenance outage and stop these NFS clients. For CentOS/RHEL 6 or earlier 1. Edit the configuration file /etc/sysconfig/nfs to have an entry which reads RQUOTAD="no". For example: # grep RQUOTAD … [Read more...] about How to Disable rpc.quotad Service in CentOS/RHEL 6 and 7
Linux
User Unable To Edit crontab, Error: “/tmp/crontab.Lm34gsJV: Permission denied”
The Problem A non-privileged user cannot edit their crontab file using the command "crontab -e" $ crontab -e no crontab for oracle - using an empty one /tmp/crontab.Lm34gsJV: Permission denied $ The Solution This can happen mainly due to wrong permission on /tmp directory. When a user tries to edit the crontab using 'crontab -e' command, a temporary crontab file is created in /tmp directory, which is overwritten on the actual crontab file when the user saves the changes. Incorrect … [Read more...] about User Unable To Edit crontab, Error: “/tmp/crontab.Lm34gsJV: Permission denied”
showmount Command Examples in Linux
showmount command shows information about an NFS server. This information is maintained by the mountd server on the host. The default value for the host is the value returned by the hostname. With no options, show the clients that have mounted directories from the host. showmount is usually found in /usr/sbin, which is not in the default search path. showmount Command Options The options available with the showmount command are as follows: OptionDescription -a, --allPrint all remote … [Read more...] about showmount Command Examples in Linux
How to Enable Debug Mode for Chronyd Service in CentOS/RHEL 8
What is Chronyd Service In CentOS/RHEL 7 and 8, the operating system's time is set on every boot based on the hardware clock, which is a small-battery driven clock located on the motherboard of your computer. Often, this clock is too inaccurate or has not been set right, therefore it's better to get your system time from a reliable source over the Internet (that uses real atomic time). The chrony daemon, chronyd, sets and maintains system time through a process of synchronization with a remote … [Read more...] about How to Enable Debug Mode for Chronyd Service in CentOS/RHEL 8
How to Recover from a Corrupted or empty /etc/mtab file in CentOS/RHEL 7
Sometimes you may get an error while running the df command saying that tat the /etc/mtab file is either corrupt or empty(removed). It may be a case that someone accidentally edited the /etc/mtab file and has incorrect data. Well, this post will help you restore your correct mtab file. What is the use of /etc/mtab file Before we begin let's see what an mtab file is. /etc/mtab is the file that maintains a list of currently mounted filesystems. So when you run a "df" command, it referes to … [Read more...] about How to Recover from a Corrupted or empty /etc/mtab file in CentOS/RHEL 7
File Access Commands in Linux – find, sort, head, tail
The following file access commands are UNIX commands, not specific shell commands. CommandRemakr findFinds the location of a file sortReads a file and sort the output hear or tailLooks at just the start or end of a file The find Command The find command allows you to search for files and directories and to execute commands on those files. The syntax of the find command has three general argument sections. The paths section is a list of pathnames (directories) to search. The … [Read more...] about File Access Commands in Linux – find, sort, head, tail