由于CentOS 7.6系统libvirt-4.5.0存在bug，所以使用virt-manager时会触发一些报错，例如：Error polling connection 'qemu:///system'：internal error: Socket 4314 can't be handled (max socket is 4095)，如果一定要用 virt-manager操作，可按照以下所述安装升级libvirt 5.6.0版本。

问题

    已安装libvirt版本

    

    打开virt-manager后，界面提示“Error polling connection 'qemu:///system'：internal error: Socket 4314 can't be handled (max socket is 4095)”的报错。

    

安装

一、安装edk2

    1） wget https://www.kraxel.org/repos/firmware.repo -O /etc/yum.repos.d/firmware.repo

    2）yum clean all && yum makecache

    3）yum -y install edk2.git-aarch64

   

二、安装依赖包

　　yum -y install gluster* libxml2-devel readline-devel ncurses-devel libtasn1-devel gnutls-devel libattr-devel libblkid-devel augeas systemd-devel libpciaccess-devel yajl-devel sanlock-devel libpcap-devel libnl3-devel libselinux-devel dnsmasq radvd cyrus-sasl-devel libacl-devel parted-devel device-mapper-devel xfsprogs-devel librados2-devel librbd1-devel glusterfs-api-devel glusterfs-devel numactl-devel libcapng-devel fuse-devel netcf-devel libcurl-devel audit-libs-devel systemtap-sdt-devel nfs-utils dbusdevel scrub numad libcap-ng-devel dbus-devel

三、获取源码包

    在线执行以下命令

    wget https://libvirt.org/sources/libvirt-5.6.0-1.fc30.src.rpm --no-check-certificate

四、编译安装

    1） 安装获取的源码包

    rpm -ivh libvirt-5.6.0-1.fc30.src.rpm

    2） 编译生成rpm包

    cd /root/rpmbuild/SPECS

    rpmbuild -ba libvirt.spec

    3） 安装rpm包

    cd /root/rpmbuild/RPMS/aarch64/

    yum -y install *.rpm

4） 修改配置文件

    在/etc/libvirt/QEMU.conf文件中添加以下内容

    nvram = ["/usr/share/edk2.git/aarch64/QEMU_EFI-pflash.raw:/usr/share/edk2.git/aarch64/vars-template-pflash.raw"]

    5） 关闭SELinux（临时）

    setenforce 0

    6） 重启libvirtd服务

    systemctl restart libvirtd.service

五、验证环境

    libvirtd --version

    

参考来源：https://www.cnblogs.com/lin-wang/p/15750165.html