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1 ±³¾°

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ÔçÔÚÈÝÆ÷±àÅÅ´óÕ½ÉÐδ³¾°£Â䶨֮ǰµÄ2016Äê10Ô£¬ºìñµÄ3¸ö¹¤³Ìʦ¾Í´´½¨ÁËKubeVirtÉçÇø£¨https://kubevirt.io/£© £¬ ÆÚÍûÄܹ»ÓÃKubernetesͳһ±àÅÅÈÝÆ÷ºÍÐéÄâ»ú¡£KubeVirtÉçÇøµÄÔ¸¾°¾ÍÊǽ«´«Í³µÄÐéÄâ»úºÍ×îеÄÈÝÆ÷¼¼ÊõͳһÓÉKubernetes½øÐйÜÀíºÍ±àÅÅ¡£Õâ¸öÔ¸¾°Ò²ÌåÏÖÔÚKubeVirtÉçÇø¹Ù·½KubeVirt×ÜÌå¼Ü¹¹Í¼ÖУ¨Í¼1 ¨C KubeVirt×ÜÌå¼Ü¹¹£¬ À´Ô´£ºhttps://github.com/kubevirt/kubevirt/blob/master/docs/architecture.md £©¡£

ͼ1 ¨C KubeVirt×ÜÌå¼Ü¹¹

±¾ÎĽ«Ö÷Òª½éÉÜKubeVirtÒÔ¼°ºìñ»ùÓÚKubevirt·¢ÐÐµÄÆóÒµ°æ¼´OpenShiftÐéÄ⻯µÄÔ­ÀíºÍÖ÷Òª¹¦ÄÜ¡£

ÐèÒªÌáµ½µÄÊÇ£¬Ï£ÍûʹÓÃKubernetes±àÅź͵÷¶ÈÐéÄâ»úµÄ²¢²»ÊÇÖ»ÓÐKubeVirtÒ»¸öÉçÇø¡£´ó¸ÅÒ²ÊÇ2016Äê×óÓÒ£¬Mirantis½¨Á¢ÁËVirtletÉçÇø£¨https://github.com/Mirantis/virtlet£©¡£¾¡¹ÜÄ¿±êÏàͬ£¬µ«KubevirtºÍVirtletÉçÇø²ÉÓÃÁ˲»Í¬µÄʵÏÖ·½Ê½£ºKubeVirtÖ÷ÒªÊDzÉÓÃKubernetesµÄ×Ô¶¨Òå×ÊÔ´CRD£¨Custom Resource Definition£©À´¹ÜÀíÐéÄâ»ú£¬¶øVirtletÊÇͨ¹ýʵÏÖÈÝÆ÷ÔËÐнӿÚCRI£¨Container Runtime Interface£©µÄ·½Ê½ÀûÓÃн¨Ò»¸öÌØÊâµÄÈÝÆ÷ÔËÐÐʱÀ´ÊµÏÖÐéÄâ»úµÄ¹ÜÀí¡£

2 ÔÚÈÝÆ÷ÀïÃæÅÜÐéÄâ»ú£¿

ÈÝÆ÷ÀïÃæÔËÐеÄÓ¦ÓóÌÐò±¾ÖÊÉÏÊÇÒ»¸ö½ø³Ì¡£ÈÝÆ÷¼¼Êõͨ¹ý²ÉÓÃLinuxµÄÃüÃû¿Õ¼ä£¨namespace£©ºÍ¿ØÖÆ×飨cgroup£©µÈÄں˼¼Êõ£¬¿ÉÒÔͨ¹ýÈÝÆ÷ʵÏÖ½ø³Ì¸ôÀ룬²¢ÇÒ¿ÉÒÔ¶Ô¸ôÀëµÄ½ø³Ì½øÐÐ×ÊÔ´·ÖÅä¿ØÖÆ¡£¼ÈÈ»£¬ÈÝÆ÷ÀïÃæÕæÕýÔËÐеÄÊǽø³Ì£¬ÄÇô£¬ÎÒÃÇÈçºÎÄÜÈÃÔÚÈÝÆ÷ÀïÃæÅÜÐéÄâ»úÄØ£¿

ÔÚ²ÉÓÃKVM×öhypervisorµÄLinux»úÆ÷ÉÏÃæ£¬´ÓhypervisorµÄ½Ç¶ÈÀ´¿´£¬ÐéÄâ»úµÄµÄÈ·È·¾ÍÊÇÒ»¸öKVM½ø³Ì¡£ÎªÁËÑéÖ¤ÕâÒ»µã£¬ÎÒÃÇ¿ÉÒÔ×öÒ»¸öСʵÑé¡£ÔÚͼ2 ÖУ¬ÎÒÃÇÔÚRHEL ÉÏÃæÍ¨¹ýÖ´ÐÐvirsh startÃüÁîÆô¶¯ÁËÒ»¸öÐéÄâ»ú¡£ÎÒÃÇ¿ÉÒÔ¿´µ½£¬Õâ¸öÐéÄâ»ú×îºó¶ÔÓ¦µ½Ò»¸öqemu-kvmµÄ½ø³Ì¡£

ͼ2 ¨C LinuxÉÏÃæµÄÐéÄâ»ú½ø³Ì

ÔÚÉÏÃæÕâ¸öʵÑéÖУ¬ÎÒÃÇʵ¼ÊʹÓÃÁËLinuxÕâô¼¸¸ö×é¼þ£º

virsh - LinuxÌṩ¹ÜÀíÐéÄâ»úµÄÃüÁîÐй¤¾ß£¬Ëüͨ¹ýµ÷ÓÃlibvirtÌṩµÄAPI½øÐÐÐéÄâ»úµÄ¹ÜÀí¡£

libvirt - libvirtÊÇÒ»×鿪ԴÐéÄâ»ú¹ÜÀíAPI£¬¿ÉÒÔÖ§³Ö¶à¸öhypervisor£¬°üÀ¨QEMUºÍKVM¡£

QEMU - QEMUÊÇÒ»¸öVMM(Virtual Machine Monitor)£¬ÓÃÓÚ½øÐÐÓ²¼þµÄÄ£Äâ¡£±¾ÖÊÉÏQEMU¾ÍÊÇÒ»¸öhypervisor£¬µ«ÊÇÓÉÓÚLinuxÄں˵ÄKVMÄ£¿éʹÓÃÁËIntelºÍAMDоƬÄÚÖõÄÓ²¼þÐéÄ⻯¹¦ÄÜ¡£ËùÒÔ£¬QEMUºÍKVMʵ¼ÊÉÏÒ»ÆðÅäºÏʹÓá£ÔÚÕâÖÖÇé¿öÏ£¬ QEMUÒ»°ã±»³ÆÎªQEMU-KVM£¬¾ßÌ帺Ôð³ýÁËCPUºÍÄÚ´æÖ®ÍâµÄÓ²¼þÄ£Ä⣬±ÈÈçÄ£ÄâÍø¿¨£¬´ÅÅ̵ȣ»Í¬Ê±£¬QEMU»¹»á½«CPUºÍÄÚ´æµÄÐéÄ⻯ָÁîÖ±½Ó·¢Ë͸øºËÐÄ̬µÄKVM¡£

KVM ¨C KVMÊÇLinuxÄÚºËÌṩµÄÐéÄ⻯¼Ü¹¹£¬Í¨¹ý´¦ÀíÆ÷Ó²¼þÌṩµÄÐéÄ⻯À©Õ¹¹¦ÄÜ£¬¿ÉÒÔʵÏÖCPUºÍÄÚ´æµÄÐéÄ⻯¡£

¼ÈÈ»ÐéÄâ»ú±¾ÖÊÊÇLinuxÓû§¿Õ¼äµÄÒ»¸öQEMU-KVM½ø³Ì£¬ÄÇô£¬Õâ¸ö½ø³Ì¾Í¿ÉÒÔÔÚÈÝÆ÷ÄÚ²¿ÔËÐС£Í¼3ÊÇÔÚOpenShift ÉÏÃæÔËÐеÄÐéÄâ»úpodÀïÃæµÄ½ø³Ì£¬ÎÒÃÇ¿ÉÒÔ¿´µ½£¬ÐéÄâ»ú½ø³ÌÒÔ¼°ÆäËûһЩ¸¨Öú½ø³Ì¶¼´æÔÚ¡£

ͼ3 ¨C ÐéÄâ»úpodÀïÃæµÄ½ø³Ì

±¾ÖÊÉÏÀ´½²£¬KubeVirtµÄÐéÄ⻯¹¦ÄÜ£¬³ýÁËûÓÐÖ±½ÓʹÓÃvirsh´´½¨ÐéÄâ»ú£¨µ«podÀïÃæÒ²ÊÇ¿ÉÒÔÔËÐÐvirshÃüÁîµÄ£©, ±¾ÖÊÉÏÒ²ÊDzÉÓÃlibvirt, QEMUºÍKVMµÈͬÑùµÄÐéÄ⻯ºËÐļ¼ÊõÀ´ÊµÏֵģ¬Èçͼ4Ëùʾ¡£

ͼ4 ¨C ÐéÄâ»úÈÝÆ÷µÄ¼Ü¹¹

ÐéÄ⻯һ°ã°üÀ¨¼ÆËã¡¢ÍøÂçºÍ´æ´¢µÄÐéÄ⻯£¬ÔÚ½â¾öÁ˼ÆËãµÄÐéÄ⻯֮ºó£¬½ÓÏÂÀ´ÎÒÃÇÔÙÀ´¿´Ò»ÏÂÍøÂçÐéÄ⻯¡£

ÓÉÓÚÐéÄâ»úÊÇÔËÐÐÔÚpodÀïÃæ£¬ÔÚÒ»°ãÇé¿öÏ£¬podʹÓõÄÊǶ¯Ì¬·ÖÅäµÄIPµØÖ·£¬Õâ¸ö¸úÐéÄâ»úÐèÒªÒ»¸ö¹Ì¶¨IPµØÖ·µÄÒªÇó²»·ûºÏ¡£ÔÚOpenShiftÖУ¬ÎÒÃDzÉÓÃÁËÒ»¸ö½Ð×öMultusµÄ¹¦ÄÜÄ£¿é£¬Õâ¸ö¹¦ÄÜÄ£¿é¿ÉÒÔÔÊÐípodͬʱÁ¬½Óµ½¶à¸öÍøÂçÖУ¬Èçͼ5Ëùʾ¡£

ͼ5 ¨C podµÄ¶àÍø¿¨¹¦ÄÜ

ÎÒÃÇ¿ÉÒÔÔÚÉÏͼµÄµÚ¶þ¿éÍø¿¨net0ÉÏÖ¸¶¨Ò»¸ö¾²Ì¬µÄIPµØÖ·ÒÔʵÏ̶ֹ¨IPµØÖ·µÄÄ¿±ê¡£

¾Í´æ´¢¶øÒÑ£¬KubeVirtʹÓÃKubernetesÔ­ÉúµÄ´æ´¢×ÊÔ´£º´æ´¢ÀࣨStorageClass£©£¬³Ö¾Ã¾íÇëÇó£¨PVC£©ºÍ³Ö¾Ã¾í£¨PV£©À´¹ÒÔØºÍ¹ÜÀíÐéÄâ»úµÄ´ÅÅÌ¡£

3 KubeVirtµÄʵÏÖ·½Ê½

KubeVirt³ä·Ö²ÉÓÃÁËKubernetes·½Ê½À©Õ¹ÁËKubernetes£¬Ö÷ÒªÔÚÒÔÏÂ3¸ö·½Ãæ½øÐÐÁËÀ©Õ¹£º

VMÏà¹ØµÄ×Ô¶¨Òå×ÊÔ´CRD±»Ôö¼Óµ½Kubernetes APIÖм䡣ÐÂÔöµÄCRD°üÀ¨VirtualMachine, VirtualMachineInstance, VirtualMachineInstanceMigration, DataVolumeµÈ¡£

н¨µÄÐéÄâ»ú¿ØÖÆÆ÷£¬ÓÃÓÚʵÏÖÉÏÊöÏà¹ØCRDÔÚÔö¡¢É¾¡¢¸ÄʱӦ¸ÃÖ´ÐеÄÏà¹Ø²Ù×÷¡£

ÿ¸ö½ÚµãÉÏÃæµÄÊØ»¤½ø³Ìvirt-handler£¨¾ßÌåʵÏÖ·½Ê½ÊÇÔËÐÐÔÚKubernetes¼¯ÈºÀïÃæµÄDaemonSet£©£¬¿ÉÒÔÈÏΪÊÇKubeVirtµÄkubelet¡£Virt-handlerºÍkubeletÒ»Æð£¬ÓÃÓÚ´´½¨ÐéÄâ»úʵÀý(VMI)£¬ÒÔ´ïµ½CRDÖÐÆÚÍûµÄ״̬¡£

ͼ6ÊÇKubeVirtÉçÇø¹Ù·½µÄÏêϸ¼Ü¹¹Í¼£¬ÁгöÁËKubeVirt¶ÔKubernetesµÄÀ©Õ¹×é¼þ¡£

ͼ6 ¨C KubeVirtÏêϸ¼Ü¹¹

ÒÔÏÂÊÇÒ»¸ö´´½¨ÐéÄâ»úµÄ´óÖÂÁ÷³Ì£º

1. ¿Í»§¶Ëͨ¹ýkubectl ´´½¨Ò»¸öVMIµÄCRDÇëÇ󣬸ÃÇëÇó±»K8S API ServerÊÕµ½¡£

2. K8S API Serverת·¢µ½virt-api£¬ virt-api¾­¹ýÑéÖ¤Ö®ºó´´½¨Ò»¸öVMIµÄCRD¶ÔÏó¡£

3. virt-controller¼ì²âµ½VMIµÄ´´½¨£¬Òý·¢´´½¨Ò»¸öpod¡£

4. Kubernetesµ÷¶È¸Ãpodµ½Ä³¸ö½Úµã¡£

5. virt-controller¼ì²âµ½¶ÔÓ¦VMIµÄpodÒѾ­Æô¶¯£¬¸üÐÂVMIµÄCRD¶¨ÒåÀïÃænodeName×ֶΡ£ÏÖÔÚ¼ÈÈ»nodeName×Ö¶ÎÒѾ­¸³Öµ£¬½ÓÏÂÀ´ÓɸýڵãÉÏÃæµÄvirt-handler½øÐÐÏà¹Ø²Ù×÷¡£

6. virt-handler¼ì²âµ½Ò»¸öVMIÒѾ­µ÷¶Èµ½ËüËùÔڵĽڵ㣬Ëü»áʹÓÃVMIÖе͍ÒåÄÚÈݸúvirt-launcherͨÐÅ¡£virt-launcher»áÔÚVMI podÖд´½¨Ò»¸öÐéÄâ»ú£¬²¢ÇÒ¸ºÔð¸ÃÐéÄâ»úµÄÉúÃüÖÜÆÚ¹ÜÀí¡£

ÔÚVMI podÄÚ²¿£¬virt-launcherÊǸÃpodµÄÖ÷ÒªÈÝÆ÷¡£virt-launcherµÄÖ÷Òª¹¦ÄÜÊÇΪÐéÄâ»ú½ø³Ì×¼±¸¿ØÖÆ×éºÍÃüÃû¿Õ¼ä¡£ÔÚ½ÓÊÕµ½À´virt-hander´´½¨ÐéÄâ»úµÄÃüÁîºó£¬virt-launcher½«»áʹÓÃ×Ô¼ºÈÝÆ÷ÄÚ²¿libvirtd´´½¨Ò»¸öÐéÄâ»úʵÀý¡£

KubeVirt»¹ÓÐÒ»¸öÃüÁîÐй¤¾ßvirtctl, ¿ÉÒÔÓÃÀ´¹ÜÀíÐéÄâ»ú£¬±ÈÈçÆô¶¯£¬¹Ø»ú£¬ÔÝÍ££¬Ç¨ÒÆ£¬ÖØÆôÒÔ¼°Á¬½ÓÎı¾»òͼÐÎÖն˵ȹ¦ÄÜ¡£

KubeVirt²ÉÓÃOperator·½Ê½°²×°£ºÊ×ÏȰ²×°Operator£¬ È»ºó´´½¨Ò»¸öCRD¡£

ʹÓÃkubectl²¿ÊðKubeVirt Operator

export VERSION=$(curl -s https://api.github.com/repos/kubevirt/kubevirt/releases | grep tag_name | grep -v -- '-rc' | head -1 | awk -F': ' '{print $2}' | sed 's/,//' | xargs)

echo $VERSION

kubectl create -f https://github.com/kubevirt/kubevirt/releases/download/${VERSION}/kubevirt-operator.yaml

´´½¨KubeVirt×Ô¶¨Òå×ÊÔ´

Ïêϸ°²×°¹ý³ÌÇë²Î¿¼KubeVirt¹Ù·½Îĵµhttps://kubevirt.io/quickstart_kind/¡£ ÖµµÃ×¢ÒâµÄÊÇ£¬Èç¹ûK8S¼¯Èº±¾ÉíÔËÐÐÔÚÐéÄâ»úÀïÃæ£¬ÄÇôÐèÒª´ò¿ªÇ¶Ì×ÐéÄ⻯¡£

kubectl create -f https://github.com/kubevirt/kubevirt/releases/download/${VERSION}/kubevirt-cr.yaml

4 OpenShiftÐéÄ⻯

OpenShiftÐéÄ⻯£¬ÊǺìñ»ùÓÚÉÏÓÎÉçÇøKubeVirtÍÆ³öµÄ¾­¹ý¼Ó¹ÌºÍÔöÇ¿µÄÆóÒµ·¢Ðа棬×÷ΪOpenShiftµÄÒ»¸ö×é¼þÌṩ¡£OpenShiftÐéÄ⻯ԭÀ´Ãû³ÆÎªÈÝÆ÷Ô­ÉúÐéÄ⻯(Container Native Virtualization£¬ÒÔϼò³ÆCNV)£¬×î³õÔÚOpenShift 3.11×÷Ϊһ¸ö¸½¼Ó×é¼þÒÔ¼¼ÊõÔ¤ÀÀµÄ·½Ê½·¢²¼¡£Ëæ×ÅCNVºÍKubeVirtÒÔ¼°OpenShiftµÄ·¢Õ¹ºÍÍêÉÆ£¬ÔÚ2020Äê4Ô·ݷ¢²¼µÄOpenShift 4.5ÖÐÒÔ×é¼þÃû³Æ¡°OpenShiftÐéÄ⻯¡±×÷ΪÉú²ú¾ÍÐ÷Ð͸½¼Ó¹¦ÄÜÕýÊ½ÍÆ³ö£¬µ±Ê±°æ±¾Îª2.4£¬ÏÖÔÚÔÚOpenShift 4.6ÖÐ×îеİ汾Ϊ2.5¡£

OpenShiftÐéÄ⻯µÄÄ¿±ê²»Êǽö½öÖ»Ìṩ´«Í³ÐéÄ⻯¼¼Êõ±ÈÈçºìñÐéÄ⻯»òVMWare vSphereÖ®ÍâµÄÁíÒ»ÖÖÑ¡Ôñ£¬¶øÊÇÒ»ÖÖ»ùÓÚKubernetesµÄȫм¼Êõ£¬Äܹ»½«´«Í³µÄ¡¢»ùÓÚÐéÄâ»úµÄÓ¦ÓÃÓëÔÆÔ­ÉúµÄ¡¢ÈÝÆ÷»¯µÄÓ¦ÓýøÐÐÕûºÏ£¨²Î¼ûͼ7-OpenShiftÐéÄ⻯×ÜÌå¼Ü¹¹£©¡£KubernetesÄܹ»ÎªÐéÄâ»úÌṩ¸ß¿ÉÓÃÐÔ¡¢µ÷¶È¡¢°²È«¡¢×ÊÔ´¹ÜÀíµÈ¹¦ÄÜ£¬¾ÍÏñΪÈÝÆ÷ÌṩÕâЩ¹¦ÄÜÒ»Ñù¡£

ͼ7 ¨C OpenShiftÐéÄ⻯×ÜÌå¼Ü¹¹

OpenShiftÐéÄ⻯µÄ´óÖÂÒµÎñ³¡¾°°üÀ¨ÕâôÈý¸ö£º

¿Í»§ÉÐ佨Á¢ÐéÄ⻯»·¾³£¬Ä¿Ç°ÆÚÍû½¨Á¢ÈÝÆ÷ÔÆÆ½Ì¨£¬Ï£ÍûͳһÓÃÈÝÆ÷ÔÆÆ½Ì¨¹ÜÀíÈÝÆ÷»¯Ó¦Óúʹ«Í³µÄÓ¦Óá£

¿Í»§ÔÚ½øÐÐÈÝÆ÷»¯×ªÐÍ£¬µ«Ô­À´µÄ´óÐ͵¥ÌåÓ¦Óõ½ÏÖ´ú΢·þÎñµÄÓ¦ÓøÄÔì²»ÊÇÒ»õí¶ø¾ÍµÄ£¬ÐèҪͨ¹ýÒ»¸ö±È½Ï³¤µÄÖÜÆÚ£¬½øÐжà´Îµü´ú²ÅÄÜÍê³ÉµÄ¡£ÔÚÕâ¸öתÐÍÖÜÆÚÖУ¬Í¨¹ýÈÝÆ÷ÔÆÆ½Ì¨Í³Ò»¹ÜÀí´«Í³µÄ´óÐ͵¥ÌåÓ¦Ó㨻ùÓÚÐéÄâ»ú£©ºÍд´½¨µÄ΢·þÎñÓ¦ÓÃÓÐÀûÓÚ½µµÍתÐ͹ý³ÌµÄ¸´ÔÓ¶È¡£

5Gʱ´úµÄ±ßÔµ¼ÆË㳡¾°¡£±ßÔµ¼ÆË㳡¾°ÐµÄÓ¦Óûù±¾¶¼Êǰ´ÕÕÈÝÆ÷»¯½øÐпª·¢µÄ£¬µ«ÁíÍâÒ»·½Ã棬Ҳ´æÔÚһЩ´«Í³µÄ»ùÓÚÐéÄâ»úµÄÓ¦Óá£Í¨¹ýʹÓÃOpenShiftÐéÄ⻯£¬¾Í¿ÉÒÔ½«Á½Õß½áºÏÆðÀ´£¬Èç¹ûÔÙ½áºÏOpenShift¶à¼¯ÈºµÄ¹ÜÀí¹¦ÄÜ£¬¾Í¿ÉÒÔ½øÐбßÔµ¼ÆËãµÄͳһ¹ÜÀí£¬ÊµÏÖÔÆ±ßЭͬµÄЧ¹û¡£

OpenShiftÐéÄ⻯³ä·ÖʹÓÃÁËOpenShiftÍêÕûÉú̬£¬ÔÚ¿É¿¿ÐÔ¡¢Îȶ¨ÐÔ¡¢Ò×ÓÃÐÔÒÔ¼°Éú̬ÓѺÃÐÔ·½Ã棬´ó´ó³¬³öÁËÆäÉÏÓÎÉçÇøKubeVirt¡£

³ýÁËÖ§³ÖÀàËÆKubeVirtÃüÁîÐз½Ê½µÄ°²×°£¬OpenShiftÐéÄ⻯°²×°»¹¿ÉÒÔ²ÉÓÃOpenShift OperatorHubÈí¼þÉ̵êµÄ·½Ê½£¬´Ó¶ø¿ÉÒÔ×öµ½Ò»¼üʽ°²×°ºÍ²¿Êð£¬Èçͼ8¡¢Í¼9ºÍͼ10Ëùʾ¡£

ͼ8 ¨C OpenShift Operator HubÖеÄOpenShift Virtualization Operator

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