参考资料
https://docs.openstack.org/kolla-ansible/train/reference/compute/libvirt-guide.html
OpenStack 容器中使用 Libvirt
OpenStack 容器中集成了 libvirt，进入容器 nova_libvirt 可以使用 virsh 命令查看虚机列表、虚机详情、虚机资源使用等信息。
# step.1 进入 docker 容器 nova_libvirt
docker exec -it nova_libvirt /bin/sh
# step.2 查看虚机列表
virsh list
Id Name State
----------------------------------------------------
28 instance-000000ee running
67 instance-000001ae running
68 instance-000001b1 running
69 instance-000000d6 running
# step.3 查看虚机详情 28 虚机id
virsh dominfo 28
Id: 28
Name: instance-000000ee
UUID: 27bcbe2d-3f1c-4de0-a751-5fee7f7e8553
OS Type: hvm
State: running
CPU(s): 16
CPU time: 44073170.4s
Max memory: 33554432 KiB
Used memory: 33554432 KiB
Persistent: yes
Autostart: disable
Managed save: no
Security model: none
Security DOI: 0
# step.3 查看虚机资源使用 28 虚机id
virsh domstats 28在容器外安装 virt-top
# step.1
yum install virt-top -y
# step.2 启动 virt-top
virt-top
virt-top 11:07:39 - x86_64 48/48CPU 2799MHz 257749MB 58.4% 58.4% 58.5% 58.4% 58.5% 58.3% 58.4%
11 domains, 4 active, 4 running, 0 sleeping, 0 paused, 7 inactive D:0 O:0 X:0
CPU: 58.5% Mem: 73728 MB (73728 MB by guests)
ID S RDRQ WRRQ RXBY TXBY %CPU %MEM TIME NAME
28 R 0 3 12K 8038 33.4 12.0 513d00:41 instance-000000ee
67 R 0 0 32K 48K 16.7 6.0 491:27:55 instance-000001ae
69 R 0 76 0 0 8.4 3.0 209:14:46 instance-000000d6
68 R 0 0 0 0 0.0 6.0 157:41:54 instance-000001b1virsh 命令
# 虚机列表 ----------------------------------------------------
virsh list
Id 名称 状态
----------------------------------------------------
28 instance-000000ee running
69 instance-000000d6 running
73 instance-000001b7 running
76 instance-000001bd running
77 instance-000001ba running
80 instance-000001b4 running
# 域信息 ----------------------------------------------------
virsh dominfo 28
Id: 28
名称： instance-000000ee
UUID: 27bcbe2d-3f1c-4de0-a751-5fee7f7e8553
OS 类型： hvm
状态： running
CPU： 16
CPU 时间： 52228467.0s
最大内存： 33554432 KiB
使用的内存： 33554432 KiB
持久： 是
自动启动： 禁用
管理的保存： 否
安全性模式： none
安全性 DOI： 0
# 域 vcpu 计数 ----------------------------------------------------
virsh vcpucount 28
# 详细的域 vcpu 信息 ----------------------------------------------------
virsh vcpuinfo 28
# 域状态 ----------------------------------------------------
virsh domstate 28 --reason
running (已引导)
# 列出域的统计时间 ----------------------------------------------------
virsh domstats 28
Domain: 'instance-000000ee'
state.state=1
state.reason=1
cpu.time=52504552418705584
cpu.user=6406610000000
cpu.system=1167761870000000
balloon.current=33554432
balloon.maximum=33554432
balloon.swap_in=0
balloon.swap_out=0
balloon.major_fault=5962
balloon.minor_fault=20114340564
balloon.unused=19014624
balloon.available=32778184
balloon.usable=23161172
balloon.last-update=1703555715
balloon.rss=32547456
vcpu.current=16
vcpu.maximum=16
vcpu.0.state=1
vcpu.0.time=3232119990000000
vcpu.0.wait=0
vcpu.1.state=1
vcpu.1.time=3293771200000000
vcpu.1.wait=0
vcpu.2.state=1
vcpu.2.time=3278008150000000
vcpu.2.wait=0
vcpu.3.state=1
vcpu.3.time=3263658960000000
vcpu.3.wait=0
vcpu.4.state=1
vcpu.4.time=3500166820000000
vcpu.4.wait=0
vcpu.5.state=1
vcpu.5.time=3252304890000000
vcpu.5.wait=0
vcpu.6.state=1
vcpu.6.time=3247763790000000
vcpu.6.wait=0
vcpu.7.state=1
vcpu.7.time=3244455030000000
vcpu.7.wait=0
vcpu.8.state=1
vcpu.8.time=3242926590000000
vcpu.8.wait=0
vcpu.9.state=1
vcpu.9.time=3240341430000000
vcpu.9.wait=0
vcpu.10.state=1
vcpu.10.time=3240201900000000
vcpu.10.wait=0
vcpu.11.state=1
vcpu.11.time=3238765480000000
vcpu.11.wait=0
vcpu.12.state=1
vcpu.12.time=3237512270000000
vcpu.12.wait=0
vcpu.13.state=1
vcpu.13.time=3236968380000000
vcpu.13.wait=0
vcpu.14.state=1
vcpu.14.time=3236084260000000
vcpu.14.wait=0
vcpu.15.state=1
vcpu.15.time=3236273290000000
vcpu.15.wait=0
net.count=1
net.0.name=tap256efb14-ad
net.0.rx.bytes=945777256706
net.0.rx.pkts=3406495058
net.0.rx.errs=0
net.0.rx.drop=0
net.0.tx.bytes=912455379041
net.0.tx.pkts=6601093454
net.0.tx.errs=0
net.0.tx.drop=0
block.count=1
block.0.name=vda
block.0.rd.reqs=5355351
block.0.rd.bytes=217238636544
block.0.rd.times=29233985318577
block.0.wr.reqs=15710720
block.0.wr.bytes=924862565888
block.0.wr.times=11025844354065885
block.0.fl.reqs=4331573
block.0.fl.times=86345312150799
block.0.allocation=171798671360
block.0.capacity=171798691840
block.0.physical=171798691840
# 获得域设备块状态 ----------------------------------------------------
virsh domblklist 28
目标 源
------------------------------------------------
vda volumes/volume-1098292c-d744-4990-94fb-51c0cff07c66
# 获得域设备块状态 ----------------------------------------------------
virsh domblkstat 28 --human
Device:
读取操作数： 5355351
读取字节数： 217238636544
写入操作数： 15709870
写入字节数： 924856935936
flush 操作数： 4331302
读取总计消耗时间 (ns)： 29233985318577
写入总计消耗时间 (ns)： 11025841781525527
Flush 总计消耗时间 (ns)： 86345233508040
rd_req 5355351
rd_bytes 217238636544
wr_req 15730331
wr_bytes 924996151296
flush_operations 4337712
rd_total_times 29233985318577
wr_total_times 11025908677851915
flush_total_times 86347134438085
# 列出域的所有虚拟接口 ----------------------------------------------------
virsh domiflist 28
接口 类型 源 型号 MAC
-------------------------------------------------------
tap256efb14-ad bridge qbr256efb14-ad virtio fa:16:3e:a5:91:e7
# 获得域网络接口状态 ----------------------------------------------------
virsh domifstat --domain 28 --interface tap256efb14-ad
tap256efb14-ad rx_bytes 945775078367
tap256efb14-ad rx_packets 3406480683
tap256efb14-ad rx_errs 0
tap256efb14-ad rx_drop 0
tap256efb14-ad tx_bytes 912451533438
tap256efb14-ad tx_packets 6601053005
tap256efb14-ad tx_errs 0
tap256efb14-ad tx_drop 0
# 获取域的内存统计 ----------------------------------------------------
virsh dommemstat 28
actual 33554432
swap_in 0
swap_out 0
major_fault 5962
minor_fault 20114013079
unused 19013256
available 32778184
usable 23159700
last_update 1703555354
rss 32548136参考资料
https://libvirt-python.readthedocs.io/monitoring-performance/#io-statistics
Golang 调用 libvirt
https://pkg.go.dev/libvirt.org/go/libvirt#section-readme
# step.1
yum install libvirt libvirt-devel pkgconfig -y
# step.2 安装 golangGo 示例代码
package main
import (
"fmt"
"libvirt.org/go/libvirt"
)
func main() {
conn, err := libvirt.NewConnect("qemu:///system")
if err != nil {
panic(err)
}
defer conn.Close()
doms, err := conn.ListAllDomains(libvirt.CONNECT_LIST_DOMAINS_ACTIVE)
if err != nil {
panic(err)
}
fmt.Printf("%d running domains:\n", len(doms))
for _, dom := range doms {
name, err := dom.GetName()
if err == nil {
fmt.Printf(" %s\n", name)
}
dom.Free()
}
}