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If it hasn’t happened to you yet, you’ll eventually experience a package update or system change that renders your server useless. You’ll then be suffer through multiple stages of fright, ranging from “Do we have a recent backup?” to “Where’s the documentation to rebuild this thing!?” With the advent of logical volumes in Linux, we […] Kickstart” is powerful tool for automated OS installation and configuration available in CentOS or RHEL. You can install CentOS without touching keyboard or mouse and even can automate post installation configuration process. I’m recently building a Hadoop cluster for R&D, which makes me repeatedly install and re-install CentOS on several virtual machines. This is boring […] We use LVM both on the guest and the CentOS KVM host. Let’s upgrade from 5 GB to 15 GB on the guest. 1. Shutdown the VM. 2. On the KVM host, take a backup of the VM LV in case something goes wrong. [root@host ~]# dd if=/dev/vg_host01/lv_guest01-vm of=./lv_guest01-vm-5gb 3. On the KVM host, […] CentOS 6.7 64bit ISO: ftp://ftp.hosteurope.de/mirror/centos.org/6.7/isos/x86_64/CentOS-6.7-x86_64-netinstall.iso URL for netinstall: ftp://ftp.hosteurope.de/mirror/centos.org/6.7/os/x86_64 LVM vg: 100% Host: lv_root / 200 GB vi /etc/sysconfig/selinux SELINUX=disabled yum install wget screen lynx vim kvm libvirt python-virtinst qemu-kvm ncftp tigervnc tigervnc-server system-config-firewall-tui xterm twm bridge-utils virt-manager openssh-askpass openssh-clients dbus-python dbus yum groupinstall Desktop yum update /etc/init.d/messagebus start system-config-firewall-tui -> disable firewall vi /etc/sysconfig/vncservers […] If you’re using yum-cron and want to automatically reboot your CentOS box whenever the kernel gets updated you can add this code to /etc/cron.daily/0yum.cron right before exit 0 at the end: entry=`cat /boot/grub/grub.conf | grep ‘^default’ | cut -d ‘=’ -f2` entry=`expr $entry + 1` if [ “`cat /boot/grub/grub.conf | grep ‘^title’ | tail […] I’m using a CentOS 6 box as backup server running BackupPC. Until a couple days ago I had a Thecus N7700PRO NAS with 4x 3 TB discs configured as RAID5 which was accessed via iSCSI from the CentOS box. Then, 2 harddrives died at the same time (or not, at least that’s what the […] Happened because I added EPEL, I believe. Very strange, on another, identical machine (steps 1:1) it worked fine, but on this box suddenly this appeared when trying to yum install something: […] –> Processing Dependency: libnuma.so.1()(64bit) for package: libvirt-0.10.2-29.el6_5.11.x86_64 –> Processing Dependency: libnl.so.1()(64bit) for package: libvirt-0.10.2-29.el6_5.11.x86_64 –> Processing Dependency: libnetcf.so.1()(64bit) for package: libvirt-0.10.2-29.el6_5.11.x86_64 –> […] EDIT: I AM the one who is stupid! Arrrrgh. Just installed Galera on yet another box and saw this passing by in yum: A RANDOM PASSWORD HAS BEEN SET FOR THE MySQL root USER ! You will find that password in ‘/root/.mysql_secret’. Arrrrghhhh. Apologies to the RPM packagers. EDIT END. Stupid RPM packagers screwed […] Disable IPv6 on Linux (CentOS) Just put this into /etc/sysctl.conf. No need to mess with the IPv6 modules. net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 And also inet_protocols = ipv4 in /etc/postfix/main.cf Why would you want to do that? I have a rogue IPv6 router advertising going on in my network that I can’t block. That […] $ ssh hostname reverse mapping checking getaddrinfo for client.example.com [10.0.0.1] failed – POSSIBLE BREAK-IN ATTEMPT! username@hostname password: Resolution There are several ways to resolve this issue: Setup a Reverse DNS Record (aka PTR Record) for the SSH client. Ensure UseDNS no and GSSAPIAuthentication no are set in /etc/ssh/sshd_config on the SSH server, then restart […] |
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