Linux RAID & LVM

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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 […]

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Configuring Linux LDAP & SSSD

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Follow the process below to get ldap working on Linux First, Disable the firewall (or configure to allow LDAP traffic). systemctl disable firewalld systemctl stop firewalld /etc/selinux/config SELINUX=disabled LDAP configuration # DC1 echo -n | openssl s_client -connect ldap1.domain.com:1636 | sed -ne ‘/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p’ > /etc/openldap/cacerts/ldap1.pem echo -n | openssl s_client -connect ldap2.domain.com:1636 | […]

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Creating a Linux Bond With vLan Tags

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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 […]

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Installing and configuring kvm on RHEL 7 and OL 7

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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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How to install Linux (OEL) on SPARC

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How to configure OVM for SPARC(LDOMS) for (OEL) Below is a OVM for SPARC(LDOMS) configuration to run Linux (OEL) on a SPARC server (T5/T7). Note: The T5-x or T7-x might require the latest firmware for this to work. ldm add-vcc port-range=5000-5100 primary-vcc0 primary svcadm enable svc:/ldoms/vntsd:default ldm set-core 28 primary ldm set-memory 256g primary ldm […]

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