Lately, Ubuntu introduced “resolvconf” which manage and maintain the legacy “/etc/resolv.conf” file. As stated in the comment of this file, any manual editing will be lost, so by default you have to use resolvconf to manage it. You will find the following text files under /etc/resolvconf/resolv.conf.d : base : used when no data can be… Read More »
Having the following error trying to install/update kernel v3.10 from the Xen repository on CentOS 6? error: Failed dependencies: kernel-firmware < 3.10.63-11.el6.centos.alt conflicts with kernel-firmware-3.10.63-11.el6.centos.alt.noarch Well, you are probably trying to install using “rpm -i” command. You should use “rpm -Uvh” instead as followed : rpm -Uvh kernel-3.10.68-11.el6.centos.alt.x86_64.rpm kernel-firmware-3.10.68-11.el6.centos.alt.noarch.rpm
Having such issue starting/stopping CSF on RHEL/CentOS 7? # csf -x *WARNING* URLGET set to use LWP but perl module is not installed, reverting to HTTP::Tiny You have an unresolved error when starting csf: Error: /sbin/ifconfig (ifconfig binary location) -v does not exist!, at line 2510 in /usr/sbin/csf You need to restart csf successfully to… Read More »
In some rare occasion, you may be unable to access the OpenVPN WebUI through the standard port tcp-943 after a brand new installation. In my particular case, it happened once with CentOS 7. This is caused by the init script that does not ran properly. To resolve this matter, just invoke the init script manually… Read More »
Here is how to remotely copy your Brocade device running FabricOS to a remote TFTP server. To copy the currently running configuration : copy startup-config tftp <TFTP_Server_IP> startup-config.cfg To copy the configuration saved to the flash memory : copy run tftp <TFTP_Server_IP> switch-name.cfg To restore the remote config to your device : copy tftp start <TFTP_Server_IP>… Read More »
RedHat can be used upon a paid subscription. You have to register your system using the following command in order to use the Yum repositories : subscription-manager register –username <username> –password <password> –auto-attach If by any chance you ran that command in the first place but you had no subscription available in your account, your… Read More »
Here is a quick reference chart on subnet size for IPv6 prefixes : CIDR Number of IPs /128 1 /127 2 /126 4 /125 8 /124 16 /123 32 /122 64 /121 128 /120 256 /119 512 /118 1,024 /117 2,048 /116 4,096 /115 8,192 /114 16,384 /113 32,768 /112 65,536 /111 131,072 /110 262,144… Read More »
Enabling automatic updates installation as they come available is quite easy. First, install the yum-cron utility as followed : yum install yum-cron Make sure the service is running : service yum-cron start Then enable the service on boot : chkconfig yum-cron on Optionnaly, you may want to exclude some packages from being updated, just edit… Read More »
Recently, when I try to build an open source project, I meet the following compile error: fatal error: ‘libelf.h’ file not found #include <libelf.h> ^ 1 error generated. The solution is installing elfutils-libelf-devel package: sudo yum install elfutils-libelf-devel Or: sudo dnf install elfutils-libelf-devel
The EPEL repository provides clang RPM package. So to install clang on CentOS 7, You need to install EPEL first: sudo yum install epel-release Then you can install “clang”: sudo yum install clang After this, you can use clang to compile your program.