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How to configure a highly available virtualization environment on Linux
Overview:
With the continuous development of virtualization technology, more and more enterprises are beginning to adopt virtualization technology to improve IT resource utilization. efficiency and reliability. In the Linux operating system, we can configure a highly available virtualization environment to ensure that when a physical server fails, the virtual machine can be seamlessly migrated to another working server. This article will introduce how to configure a highly available virtualization environment on Linux, and attach code examples.
Debian series:
$ sudo apt-get install qemu-kvm libvirt-clients libvirt-daemon-system bridge-utils virt-manager
Red Hat series:
$ sudo yum install qemu-kvm libvirt bridge-utils virt-manager
$ sudo virt-manager
In the virt-manager interface, we can click "Create a new virtual machine " to create a new virtual machine. Configure the virtual machine name, memory size, hard disk size and other parameters as needed.
Debian series:
$ sudo apt-get install targetcli
Red Hat series:
$ sudo yum install targetcli
After the installation is complete, we can use the targetcli command to create iSCSI shared storage. Here is an example:
$ sudo targetcli
/> backstores/block create storage /dev/sdb
/> iscsi/ create iqn.2020-01.com.example:storage
/> iscsi/iqn.2020-01.com.example:storage/tpg1/luns create /backstores/block/storage
/> exit
Debian series:
$ sudo apt-get install pacemaker corosync fence-agents
Red Hat series:
$ sudo yum install pacemaker corosync fence-agents
After the installation is complete, we need to configure Pacemaker. Open a terminal and run the following command:
$ sudo crm configure
Use the following command to create a virtual ip resource and associate it to the virtual machine:
crm(live)# primitive virtual-ip ocf:heartbeat:IPaddr2 params ip="192.168.0.100" cidr_netmask="24" nic="eth0" op monitor interval="30s"
crm(live)# primitive virtual-machine ocf:pacemaker: VirtualDomain params hypervisor="qemu:///system" config="/etc/libvirt/qemu/some_guest.xml" op monitor interval="30s"
crm(live)# group vm-group virtual-ip virtual- machine
crm(live)# commit
$ sudo virsh destroy some_guest
$ sudo virsh undefine some_guest
Before shutting down the virtual machine, you can use the following command to view The node where the virtual machine is located:
$ sudo crm status
Conclusion:
By configuring a highly available virtualization environment, we can ensure that when a physical server fails, the virtual machine can Seamlessly migrate to another working server. This article introduces how to use KVM, iSCSI, Pacemaker, and Corosync to configure a highly available virtualization environment on Linux, and provides corresponding code examples. I hope this article can be helpful to readers when configuring a highly available virtualization environment.
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