Docker Run options
-v : Share a file system
Mount host directory
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docker run -v <host directory path>:<container directory path>
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Dockerfile:
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FROM ubuntu:latest
RUN mkdir new_dir
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docker run -it -v ~/Desktop/monted_folder:/new_dir <container> bash
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If new_dir directory does not exist in the container, docker automatically create it.
-u : Set access privilege to the files
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docker run -u <user id>:<group id>
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At host, check user and group id.
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% id -u
501
% id -g
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Create a folder on the host.
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mkdir ~/Desktop/mounted_folder
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Dockerfile
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FROM ubuntu:latest
RUN mkdir created_in_Dockerfile
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Docker build
Run a container with -u option.
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docker run -it -u $(id -u):$(id -g) -v ~/Desktop/mounted_folder:/created_in_run 87496285f4d1 bash
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At the container,
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% docker start 87496285f4d1
% docker attach 87496285f4d1
I have no name!@87496285f4d1: $ ls -alrt
total 60
drwxr-xr-x 2 root root 4096 Apr 18 2022 home
drwxr-xr-x 2 root root 4096 Apr 18 2022 boot
lrwxrwxrwx 1 root root 8 Jun 24 02:06 sbin -> usr/sbin
lrwxrwxrwx 1 root root 7 Jun 24 02:06 lib -> usr/lib
lrwxrwxrwx 1 root root 7 Jun 24 02:06 bin -> usr/bin
drwxr-xr-x 11 root root 4096 Jun 24 02:06 usr
drwxr-xr-x 2 root root 4096 Jun 24 02:06 srv
drwxr-xr-x 2 root root 4096 Jun 24 02:06 opt
drwxr-xr-x 2 root root 4096 Jun 24 02:06 mnt
drwxr-xr-x 2 root root 4096 Jun 24 02:06 media
drwxr-xr-x 11 root root 4096 Jun 24 02:31 var
drwx------ 2 root root 4096 Jun 24 02:31 root
drwxrwxrwt 2 root root 4096 Jun 24 02:31 tmp
drwxr-xr-x 5 root root 4096 Jun 24 02:31 run
drwxr-xr-x 2 501 dialout 64 Aug 4 08:04 created_in_run
drwxr-xr-x 2 root root 4096 Aug 5 04:16 created_in_Dockerfile
drwxr-xr-x 1 root root 4096 Aug 5 04:20 etc
-rwxr-xr-x 1 root root 0 Aug 5 04:20 .dockerenv
drwxr-xr-x 1 root root 4096 Aug 5 04:20 ..
drwxr-xr-x 1 root root 4096 Aug 5 04:20 .
dr-xr-xr-x 13 root root 0 Aug 5 04:29 sys
dr-xr-xr-x 207 root root 0 Aug 5 04:29 proc
drwxr-xr-x 5 root root 360 Aug 5 04:29 dev
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-p : Publish a port
Connect host port to container port
(Publish a container port to a host port)
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docker run -p <host_port>:<container_port>
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docker run -it -p 8888:8888 --rm jupyter/datascience-notebook bash
jupyter notebook
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Limit a computer resources
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% sysctl -n hw.physicalcpu_max
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% sysctl -n hw.logicalcpu_max
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% sysctl sysctl hw.memsize
sysctl.proc_translated: 1
sysctl.proc_native: 1
hw.memsize: 17179869184
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- –cpus : Limit the number of CPU that container can access
- –memory: Limit the size of memory that container can access
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docker run -it --rm --cpus 4 --memory 2g ubuntu bash
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docker inspect
Check with docker inspect
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% docker inspect b37bb2217b8a | grep -i cpu
"CpuShares": 0,
"NanoCpus": 4000000000,
"CpuPeriod": 0,
"CpuQuota": 0,
"CpuRealtimePeriod": 0,
"CpuRealtimeRuntime": 0,
"CpusetCpus": "",
"CpusetMems": "",
"CpuCount": 0,
"CpuPercent": 0,
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% docker inspect b37bb2217b8a | grep -i memory
"Memory": 2147483648,
"KernelMemory": 0,
"KernelMemoryTCP": 0,
"MemoryReservation": 0,
"MemorySwap": 4294967296,
"MemorySwappiness": null,
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