暂时,我使用-v
参数,如/rootfs/shared_dir:/docker/docker_file
。
容器在文件夹中创建了一些数据文件,我想与我的系统共享该文件夹。
我还想限制 docker 容器中的 IO 速度。我该怎么做?
在 1.10 版本之后,docker 添加了新功能来操纵容器中的 IO 速度。
~$ docker help run | grep -E 'bps|IO'
Usage: docker run [OPTIONS] IMAGE [COMMAND] [ARG...]
--blkio-weight Block IO (relative weight), between 10 and 1000
--blkio-weight-device=[] Block IO weight (relative device weight)
--device-read-bps=[] Limit read rate (bytes per second) from a device
--device-read-iops=[] Limit read rate (IO per second) from a device
--device-write-bps=[] Limit write rate (bytes per second) to a device
--device-write-iops=[] Limit write rate (IO per second) to a device
例如,如果要将写入速度限制为 50 MB/s
$ docker run -it --rm --device-write-bps /dev/sda:50mb ubuntu /bin/bash
root@e88db9cb1263:/# time dd if=/dev/zero of=test.out bs=1M count=1024 oflag=direct
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 20.4334 s, 52.5 MB/s
real 0m20.437s
user 0m0.016s
sys 0m0.472s
没有限制我的速度是 291 MB/s
~$ docker run -it ubuntu bash
root@2911226bd75e:/# time dd if=/dev/zero of=test.out bs=1M count=1024 oflag=direct
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 3.69373 s, 291 MB/s
real 0m3.696s
user 0m0.004s
sys 0m0.496s
就我而言,我使用的是带有名为卷的 docker 的 Centos7,
第一
查找设备名称属于要限制的容器。
docker inspect your_container_id | grep DeviceName
而不是得到类似的东西
"DeviceName": "docker-8:3-331888-ef7d6d85f9bda07ba4c5eb3b6f4b903fcb72554c223d9e467ab7df74917bc31c"
第二
df -h
然后你会得到类似的东西
/dev/dm-2 10G 416M 9.6G 5% /var/lib/docker/devicemapper/mnt/584688469e65ec95e5618f7a16692294219a1be90537659b0888e35225bb5721
shm 64M 0 64M 0% /var/lib/docker/containers/863b665d8587cf37eeab2ec82e72b879ffbee8cca65bb816e991108fc290545f/shm
/dev/dm-1 10G 223M 9.8G 3% /var/lib/docker/devicemapper/mnt/ab182292ebe8febe945783b84a1340232855c17ede23bc94ffc3eaecfa12e3d2
shm 64M 0 64M 0% /var/lib/docker/containers/c4262a88cd77a91cbe83e4132bccb52573b550cb3db6194f9a55d31d7a001449/shm
/dev/dm-4 10G 573M 9.5G 6% /var/lib/docker/devicemapper/mnt/8b422f5b431d5927940952a5f1f6486efe0771c555c8989cfcd5b62bc85d4ede
/dev/dm-3 10G 778M 9.3G 8% /var/lib/docker/devicemapper/mnt/fd9ff8355bd57a7808294fed7dccec10aba74faf494aa53c23ef5bb1cb561c5f
/dev/dm-5 10G 808M 9.3G 8% /var/lib/docker/devicemapper/mnt/1efe06cb650ab88dc0530220e26ff0809f6af6c8cc368f8f5f8f4ec2e8719a7b
DM-X 的数量取决于您运行的容器数量。查找与您的容器设备名称编号匹配的 DM-X。
然后你可以按照@stambata说的去做:
$ docker run -it --rm --device-write-bps /dev/dm-x:50mb centos /bin/bash