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CentOS – Existing lock /var/run/yum.pid: another copy is running as pid xxxx.

May 29, 2017 by @HKw@! | No Comments | Filed in centos, Fedora, Linux, RedHat

Error Message “Existing lock /var/run/yum.pid: another copy is running as pid xxxx.”  is a very common error which you might come across in Red Hat Linux distro while trying to run yum command.

As you see the error from above screenshot, it mentioned that yum command is locked by another application. Meaning that someone already run the yum command and the process is running.

To find out which process and user holding the yum lock, just enter following command:-

From the above screenshot, PID 11290 is currently run by root user and holding the yum lock.


It is very easy to solve this issue, first wait the process finished. Second is kill the process ID. Below is the command to kill the PID

kill -9 11290

Now you should able to use yum command.



April 2, 2016 by @HKw@! | No Comments | Filed in centos, Debian, Fedora, Linux, RedHat, Ubuntu

When i transfer my private key file to my new Mac OS X, i got an error message below:-

lims-air:~ techkaki$ ssh techkaki@ns1.test.my
Permissions 0755 for ‘/Users/techkaki/.ssh/id_rsa’ are too open.
It is required that your private key files are NOT accessible by others.
This private key will be ignored.
bad permissions: ignore key: /Users/techkaki/.ssh/id_rsa
techkaki@ns1.test.my’s password:

If you are getting this error then you probably reset the permissions on your hidden .ssh directory in your user folder.

So, the solution for this is, make that file(id_rsa) readable or writable only for the owner with private key. Below is the command

sudo chmod 600 ~/.ssh/id_rsa

After change the permission, my problem is solved.


bash: rsync: command not found

October 16, 2015 by @HKw@! | No Comments | Filed in centos, Fedora, Linux, RedHat

I was trying to rsync files from my Mac to a CentOS VM, and was getting below error:-

rsync command not found

The root cause of getting above error message is the remote machine is not installed rsync command.

To solve this issue, just to install the rsync on the remote machine.

install rsync

That’s it!