问题
I am trying to throttle the disk I/O of a Docker container using the blkio controller (without destroying the container), but I am unsure how to find out which device to run the throttling on.
The Docker container is running Mongo. Running a df -h inside the bash of the container gives the following:
root@82e7bdc56db0:/# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/docker-202:1-524400-916a3c171357c4f0349e0145e34e7faf60720c66f9a68badcc09d05397190c64 10G 379M 9.7G 4% /
tmpfs 1.9G 0 1.9G 0% /dev
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/xvda1 32G 3.2G 27G 11% /data/db
shm 64M 0 64M 0% /dev/shm
Is there a way to find out which device to limit on the host machine? Thanks!
$docker info
Containers: 9
Running: 9
Paused: 0
Stopped: 0
Images: 6
Server Version: 1.12.1
Storage Driver: devicemapper
Pool Name: docker-202:1-524400-pool
Pool Blocksize: 65.54 kB
Base Device Size: 10.74 GB
Backing Filesystem: xfs
Data file: /dev/loop0
Metadata file: /dev/loop1
Data Space Used: 1.694 GB
Data Space Total: 107.4 GB
Data Space Available: 30.31 GB
Metadata Space Used: 3.994 MB
Metadata Space Total: 2.147 GB
Metadata Space Available: 2.143 GB
Thin Pool Minimum Free Space: 10.74 GB
Udev Sync Supported: true
Deferred Removal Enabled: false
Deferred Deletion Enabled: false
Deferred Deleted Device Count: 0
Data loop file: /var/lib/docker/devicemapper/devicemapper/data
WARNING: Usage of loopback devices is strongly discouraged for production use. Use `--storage-opt dm.thinpooldev` to specify a custom block storage device.
Metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata
Library Version: 1.02.110 (2015-10-30)
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
Volume: local
Network: null host overlay
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Security Options: apparmor seccomp
Kernel Version: 4.4.0-38-generic
Operating System: Ubuntu 16.04.1 LTS
OSType: linux
Architecture: x86_64
CPUs: 2
Total Memory: 3.675 GiB
Name: ip-172-31-6-72
ID: 4RCS:IMKM:A5ZT:H5IA:6B4B:M3IG:XGWK:2223:UAZX:GHNA:FUST:E5XC
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
WARNING: No swap limit support
Insecure Registries:
127.0.0.0/8
df -h on the host machine:
Filesystem Size Used Avail Use% Mounted on
udev 1.9G 0 1.9G 0% /dev
tmpfs 377M 6.1M 371M 2% /run
/dev/xvda1 32G 3.2G 27G 11% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
tmpfs 377M 0 377M 0% /run/user/1001
来源：https://stackoverflow.com/questions/40277920/which-device-docker-container-writing-to