Linux

How to Configure BIND Named Service on Enterprise Linux 7

by Ed Chen
August 6, 2015August 5, 2020

Since we are running on CentOS 7.1 Minimal which has no default named service, so we need to install it either by yum install bind… Read More »

How to Know UUID of a Network Interface Card

by Ed Chen
July 7, 2015March 30, 2018

In some cases, you might want to know UUID of NICs, here is the command to see the information on Enterprise Linux 7.[root@test ~]# nmcli… Read More »

How to Configure the Second NIC on Enterprise Linux 7 - by Modifying Configuration File

by Ed Chen
July 4, 2015November 18, 2022

After you added the second network interface card (NIC) on Enterprise Linux 7, the server can detect the presence of the NIC, but they are… Read More »

How to Change NIC Device Name Back to eth0 on Enterprise Linux 7

by Ed Chen
July 3, 2015November 18, 2022

After installing CentOS 7.1 release 1503 in a virtual machine, I found the conventional NIC name has been changed as eno16777736, not eth0 anymore. But this… Read More »

How to Use ifconfig, netstat or route on Enterprise Linux 7

by Ed Chen
July 2, 2015March 30, 2018

You may have know that ifconfig is no longer the default command of networking on Enterprise Linux 7.[root@test ~]# ifconfig-bash: ifconfig: command not found[root@test ~]#… Read More »

3 Replace-Equivalent Commands on Linux

by Ed Chen
June 29, 2015March 30, 2018

Here are several ways to do replacement on Linux:Output the replacing result to the same file by sed with option -i[oracle@test ~]$ sed -i 's/Ed… Read More »

How to Kill Online Users on Linux

by Ed Chen
June 7, 2015November 22, 2022

At times, there're some unconnected sessions on the server, which were interrupted by accident on the client side, and you might want to remove them… Read More »

How to Monitor Specific Terms by Filtering Output of "tail -f" on Linux

by Ed Chen
April 12, 2015November 22, 2022

You might feel tedious or nothing special when watching log files by tail -f, especially when the log files contain thousands of transaction at the… Read More »

How to Refresh Web Servers Instead of Reboots on Enterprise Linux 6

by Ed Chen
February 21, 2015November 22, 2022

Some system administrators (SA) regularly reboots the web server for better performance, it's clean and totally refreshed. But for 24/7 services, server reboots will interrupt… Read More »

How to Clear Swap on Linux

by Ed Chen
January 1, 2015May 17, 2023

Switching SWAP on and off can release and clear the space.Check SWAP space before bouncing.[root@localhost ~]# free total … Read More »

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