How to list all TCP ports in Linux ?
In this post, we will check how to list all TCP ports in Linux. Lets us quickly check the command and output: [root@nglinux ~]# cat /etc/services | grep -Po '^\w+.*\d{1,5}/tcp'...
Category: Linux/Unix
In this category, you can see all articles related to Unix or Linux operating System.
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How to find all hard links to a file on your Linux system ?
We all as a system admin should know how to find all hard links to a file on our system. So let us have a look, how to find this...
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How to set domainname in RHEL 6 or CentOS 6 or NGE Linux 1.0 ?
In this post, we will check how to set/change domain name of our system in RHEL6 or CentOS6. NGE Linux 1.0 is based on CentOS 6, hence everything based on...
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Solved: RTNETLINK answers: File exists during service network restart Linux: RHEL6 or CentOS 6
In RHEL 6 or CentOS 6, sometimes we do encounter a strange issue and we are not able to restart network service with below error. RTNETLINK answers: File exists Error...
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Solved: service cman start failed: Redhat cluster
During redhat cluster configuration, when adding the nodes into cluster, sometimes it is failed with below error on the screen. service cman start failed To resolve this issue, try to...
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How to measure read and write speed of a disk in Linux ?
There are many monitoring tools available to measure disk read or write speed. However suppose if we have slow disk performance and want to measure the disk read/write speed manually...
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Solved: Stopping cgconfig service: cgclear failed with Device or resource busy : Linux cgroup
While restarting cgconfig service, many of the times we used to encounter “Device or resourse busy error” and the service restart gets failed. [root@nglinux ~]# service cgconfig restart Stopping cgconfig...
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How to limit physical memory RAM allocation for a particular user in Linux using cgroups ?
We have seen many posts how to limit memory or cpu for a user/group using /etc/security/limits.conf file. However when we limit memory usage by referencing AS(address space) in /etc/security/limits.conf file,...
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Linux: What is : in bash and what is its impact of use ?
Today we will look what is : in bash shell in Linux or Unix and how to use it, and what is its impact if used. What is : (colon)...
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How to limit memory allocated to a user’s processes & resolve “memory exhausted” error in Linux?
In this article, we will look how to limit memory usage by a process on Linux system, Again for this trick, we can use the file /etc/security/limits.conf to pose the...