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semget: No space left on device To see how many semaphores are being used, SSH to your server as root and run the following: ipcs -s In order to get Apache started again, we must clear the semaphores. Run this for-loop to flush them: for whatever in `ipcs -s | awk ‘{print $2}’`; do ipcrm […] Overview A flaw in OpenSSH, discovered and reported by Qualys on Jan. 14, 2016, could potentially allow an information leak (CVE-2016-0777) or buffer overflow (CVE-2016-0778) via the OpenSSH client. Specifically, an undocumented feature called roaming, introduced in OpenSSH version 5.4, can be exploited to expose a client’s private SSH key. Impact The roaming feature, which […] root@core /]# yum list Loaded plugins: fastestmirror Determining fastest mirrors Error: Cannot retrieve metalink for repository: epel. Please verify its path and try again [epel] … sslverify=false sed -i “s/mirrorlist=https/mirrorlist=http/” /etc/yum.repos.d/epel.repo # mysql check process mysqld with pidfile /var/lib/mysql/ns388683.pid group database start program = “/etc/init.d/mysql start” stop program = “/etc/init.d/mysql stop” if failed host 127.0.0.1 port 3306 then restart if 5 restarts within 5 cycles then timeout # nginx check process nginx with pidfile /opt/nginx/logs/nginx.pid start program = “/etc/init.d/nginx start” stop program = “/etc/init.d/nginx stop” […] Create a new file named MonitSMS.sh in your /root directory (or wherever you prefer – i use root because I manage many different type of OS) and paste the following code: #!/bin/sh /usr/bin/curl \ -X POST http://textbelt.com/text \ -d number=1111111111 \ -d “message=[$MONIT_HOST] $MONIT_SERVICE – $MONIT_DESCRIPTION” Change 1111111111 to your cell/mobile phone number. Give it […] Useradd in Linux – Not copying any file from skel directory into it useradd: warning: the home directory already exists. Not copying any file from skel directory into it. If the directory didn’t exist , the Linux useradd process creates the directory and copies the skel files : .kshrc , .bashrc , .bash_profile and .bash_logout […] “systemd is a suite of basic building blocks for a Linux system. It provides a system and service manager that runs as PID 1 and starts the rest of the system. systemd… offers on-demand starting of daemons, keeps track of processes using Linux control groups, …and implements an elaborate transactional dependency-based service control logic.” tions […] 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 […] |
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