LVM stuff pvdisplay vgdisplay lvdisplay Check status cat /proc/mdstat cat /etc/mdadm.conf Make Raid 10 mdadm –create /dev/md30 –run –level=10 –chunk=4 –raid-devices=4 /dev/sda /dev/sdb /dev/sdd /dev/sdf mdadm –examine /dev/md30 mdadm –detail /dev/md30 Make file system mkfs.ext4 -O extent -b 4096 -E stride=128,stripe-width=128 -O ^has_journal /dev/md30 tune2fs -o journal_data_writeback /dev/md30 # append output to /etc/mdadm.conf mdadm –detail …
How to create a vlan interface and start at boot time. First check if the bounding module is loaded. lsmod | grep 8021q /etc/sysconfig/network-scripts/ifcfg-solr DEVICE=solr TYPE=Ethernet BOOTPROTO=none ONBOOT=yes /etc/sysconfig/network-scripts/ifcfg-solr.2018 DEVICE=solr.2018 IPADDR=10.10.18.51 NETWORK=10.10.18.0 NETMASK=255.255.254.0 GATEWAY=10.10.18.1 ONBOOT=yes BOOTPROTO=none USERCTL=no VLAN=yes To test just issue /etc/init.d/network restart or ifup [if_name] To remove the new vlan How to remove …
Memory usage while : ;do date;echo “================”;ps -eo pid,pmem,rss,comm –sort rss|egrep “PID|java” |tail -12;echo “=================”;sleep 5;done top example nohup top -b -d 2 | egrep –color=auto “top|Task|Cpu|Mem|Swap|PID|elastic” >> top.out &
Installing and configuring KVM on RHEL 7 and OL 7 Installing the required packages yum -y install qemu-kvm qemu-img virt-manager libvirt libvirt-python python-virtinst libvirt-client virt-install virt-viewer yum -y install kvm libvirt python-virtinst virt-top virt-manager virt-v2v virt-viewer vim pv Disable firewall (to get around some issues) systemctl stop firewalld systemctl disable firewalld Now, Start libvirt by …
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First get the device name dmesg | egrep -i –color 'cdrom|dvd|cd/rw|writer' Create mountpoint if not exsists mkdir /media/cdrom mkdir /media/disk Syntax to mount DVD / CDROM in Linux mount -t iso9660 -o ro /dev/deviceName /path/to/mount/point For Example mount -t iso9660 -o ro /dev/sr0 /cdrom Syntax to mount disk in Linux mount /dev/deviceName /path/to/mount/point
Protecting Files From Overwriting Mistakenly To set protection on, run the below. set -o noclobber To make it permanent just add to your .bashrc echo ‘set -o noclobber’ >> ~/.bashrc An example how things will work after noclobber is set. $ echo test > testfile1 bash: testfile1: cannot overwrite existing file To forcibly overwrite the …
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If you don't install 32bit OS librrey's you might get errors like this. perl perl: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.2.5, not stripped To fix this issue you will need to install at miniumem the system 32bit libryrys yum install glibc.i686