24 FAQ tagged "rhel"
Viewing 11-20 of 24 FAQ -- Linux Virtual Network Interfaces Go Down When I bring Down eth0:0 :
My RHEL / CentOS Linux 4.x virtual network interfaces go down when I bring down eth0:0. How do I fix this issue?
- RHEL 4: Find up2date command module / library dependencies :
Q. I’m using RHEL 4.x as database server. How can I run the up2date command to find out what package will satisfy library / module dependencies via RHN?
A.Update Agent provides a complete system for updating the RPM packages installed on a Red Hat Enterprise Linux system. Both command line and graphical interfaces are included. [...] - List or Check Installed Linux Kernels :
Q. How do I list all installed kernel on Linux operating system? How do I find out current kernel version?
A. You can use standard package listing command to list installed kernels.
RedHat / CentOS / RHEL / Fedora Linux user
You need to use standard rpm command to list installed software. Type the following command at [...] - How to: Disable firewall on RHEL / CemtOS / Redhat Linux :
Q. I don’t want firewall because I only run one http (port 80) public service. How do I turn off or disable firewall permanently under RHEL?
A. iptables is administration tool / command for IPv4 packet filtering and NAT.
service is a command to run a System V init script. It is use to [...] - Linux taskset to retrieve or set a processess CPU affinity :
Q. How do I use Linux (RHEL) taskset command to set or get the CPU affinity of a running process given its PID or to launch a new COMMAND with a given CPU affinity?
A. You need to use taskset command. CPU affinity is a scheduler property that “bonds” a process to a given set of [...] - Block ip address of spammers with iptables under Linux :
Q. How do I block ip address of spammers with iptables based firewall under CentOS Linux 5?
A. You can simply block IP address of spammers by editing /etc/sysconfig/iptables file under:
a) CentOS Linux
b) Fedora Linux
c) RHEL 4.x/5.x etc
Open file /etc/sysconfig/iptables:
# vi /etc/sysconfig/iptables
Append ip address of spammers as follows:
-A RH-Firewall-1-INPUT -s SPAMMER-IP -j DROP
-A RH-Firewall-1-INPUT -s SPAMMER-SUBNET-BLOCK [...] - Linux disable unneeded modules in Apache to save memory :
Q. How do I disable unneeded Apache modules under Debian Linux?
A. You can disable all unneeded modules in Apache to save memory and improve performance. This may also result into improved security. Different Linux distribution follows different methods for disabling modules.
Debian / Ubuntu Linux disable a module
Debian / Ubuntu Linux comes with two scripts:
(a) a2enmod [...] - Redhat / CentOS Linux list all packages available for installation :
Q. How do I list all packages available for installation from Internet using Red Hat Enterprise Linux or CentOS 5?
A. You can yum command and it has option to show a list of all packages that are not presently installed and can be installed via RHN or Internet.
yum list available
yum list available [...] - Redhat Enterprise Linux 5 / CentOS 5 monitor and track TCP connections on the network (eth0) :
Q. How do I track and monitor connection for eth1 public network interface under Redhat Enterprise Linux (RHEL) 5 server?
A.You can use netstat command or tcptrack command. Both command can show established TCP connection and provides the ability to monitor the same.
netstat command
netstat command prints information about the Linux networking subsystem. It also works [...] - Buffer I/O error on device fd0, logical block 0 error and simply soultion :
Q. I’ve CentOS 5 server running on Dell hardware. I’m getting following error message in my /var/log/message file (some time message is also shown on console):
Jul 05 12:04:05 dell01 kernel: end_request: I/O error, dev fd0, sector 0
Jul 05 12:04:05 dell01 kernel: Buffer I/O error on device fd0, logical block 0
Jul 05 12:04:18 dell01 kernel: end_request: [...]
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