OpenStack虚拟机资源限制

目标

• 通过nova服务的flavor模板中的元数据，来限制虚拟机CPU、磁盘IO资源等，以保证物理机以正常速度运行,也可以使不同的虚拟机以同样的速度运行。*

准备

• openstack
• nova
• vm

过程

创建vm模板

• test模板 id为10 内存4G 硬盘100G vcpu4个*

[root@controller ~]# nova flavor-create test 10 4096 100 4

限制磁盘速度：

• 读写速度均为10MB*

[root@controller ~]# nova flavor-key test set quota:disk_read_bytes_sec=10240000 [root@controller ~]# nova flavor-key test set quota:disk_write_bytes_sec=10240000

限制cpu占用比例（5%）：

[root@controller ~]# nova flavor-key test set quota:cpu_period=1000000 [root@controller ~]# nova flavor-key test set quota:cpu_quota=50000

测试：

[root@controller ~]# nova boot --image centos7.2 --flavor test --nic net-name=int-net1 test

磁盘读写测试：

• 设置不同的块大小，测试结果均为10MB。*

[root@test ~]# dd if=/dev/zero of=testfile bs=8k count=5000 oflag=direct 5000+0 records in 5000+0 records out 40960000 bytes (41 MB) copied, 3.90028 s, 10.5 MB/s [root@test ~]# dd if=/dev/zero of=testfile bs=1M count=50 oflag=direct 50+0 records in 50+0 records out 52428800 bytes (52 MB) copied, 4.9546 s, 10.6 MB/s [root@test ~]# dd if=/dev/zero of=testfile bs=10M count=50 oflag=direct 50+0 records in 50+0 records out 524288000 bytes (524 MB) copied, 50.9428 s, 10.3 MB/s

cpu测试：

• 虚拟机cpu限制为5%等于400%*0.05=20%，也就是说虚拟机最多使用已分配资源的20%。*

创建cpu负载：

[root@test ~]# stress -c 24 stress: info: [10215] dispatching hogs: 4 cpu, 0 io, 0 vm, 0 hdd

cpu负载情况：

[root@test ~]# top -s Tasks: 122 total, 18 running, 104 sleeping, 0 stopped, 0 zombie %Cpu0 : 5.0 us, 0.0 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 95.0 st %Cpu1 : 5.0 us, 0.0 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 95.0 st %Cpu2 : 5.3 us, 0.0 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 94.7 st %Cpu3 : 5.0 us, 0.0 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 95.0 st KiB Mem : 4047276 total, 3837488 free, 84040 used, 125748 buff/cache KiB Swap: 0 total, 0 free, 0 used. 3801536 avail Mem

• 5+5+5.3+5=20%,可见cpu资源被限制。* 附： 云主机类型：

[root@controller ~]# nova flavor-show test + ----------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+ | Property | Value | + ----------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+ | OS-FLV-DISABLED:disabled | False | | OS-FLV-EXT-DATA:ephemeral | 0 | | disk | 100 | | extra_specs | {"quota:disk_read_bytes_sec": "10240000", "quota:cpu_period": "1000000", "quota:disk_write_bytes_sec": "10240000", "quota:cpu_quota": "50000"} | | id | 21e74ec4-d7a2-4902-917c-a4487cecc5cc | | name | test | | os-flavor-access:is_public | True | | ram | 4096 | | rxtx_factor | 1.0 | | swap | | | vcpus | 4 | + ----------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+