Easiest way to get the dates when your redhat linux server is patched.
Today we will look at an interesting article to find out the exact dates when we have our linux system patched. a. The trick to find when is your kernel...
Tag: centos
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Solved: /var/adm/messages and auth.log file not rotating in Linux.
Today we will see an interesting issue where the logs are collected in /var/adm/messages as per rsyslog.conf. However the log file size in increasing infinitely and is not rotating. It...
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How to write random or zero characters to a device in Linux ?
In this post we will look at an interesting feature of linux to write zeros or random characters to any device in Linux. One old way is to use dd...
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Solved: libvirt: Storage Driver error : internal error: storage volume name ‘XXX.ngelinux.com_disk1.qcow2’ already in use.
Today we will see how to correct one of the common error message seen when we try to add a virtual machine in KVM on RHEL server. Lets try to...
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Solved: Not able to see console after POST in Redhat Enterprise Linux or Centos.
Some Linux Operating Systems, or RHEL versions sometimes disable console video and you might be not able to see remote console after POST. This happens due to a kernel issue...
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systemd limit directives: Set ulimit in RHEL7 or CentOS 7
1. Resource limit directives, their equivalent ulimit shell commands and the unit used Directive ulimit equivalent Unit LimitCPU= ulimit -t Seconds LimitFSIZE= ulimit -f Bytes LimitDATA= ulimit -d Bytes LimitSTACK=...
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How to reset TIME_WAIT connection on my linux server ?
If you working as a system admin, you might have faced issue of multiple TIME_WAIT connections on a server resulting in no/slow connections to the specific server(s). To resolve such...
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How to view last users’ login history in Linux ?
Today we will see how to view user login history in linux. For this, we will use “last” command which gives login history for any specific username mentioned. If we...
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How to identify if our linux kernel is build with a specific option or not, for example if cgroup option is enabled during kernel build or not ?
Sometimes when you browse solution to some issue, you might have seen “make sure your kernel supports —- option i.e. during its build, this option is specified and enabled ?”...
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What is the meaning and impact of /run/user/0 and /run/user/1000 directories in Linux(Fedora) ?
Have you ever worked in latest versions of fedora ? If yes, you might have observed some directories “/run/user/some-number” when doing “df -h”. Lets see the command output. [saket@localhost ~]$...