英文:
Limit Ubuntu-SSH Image Container's Disk Size
问题
我尝试过在compose文件中添加`storage_opt: size: 100G`，但在容器中运行df -H时，它返回了主机磁盘的可用大小和磁盘使用情况（在此示例中为已用400GB，可用1.9TB）。
我是否需要在主机上创建一个磁盘，并将其映射到我的容器的/dev/sdx磁盘？或者是否有一种更好的方法，容器可以访问主机磁盘作为完整的磁盘，但只能使用其中的一部分。
英文:
How can I limit the storage use of a Ubuntu 20.04 Image Container with SSH Enabled in Docker?
I understand that one should not use Docker as a VM Technology but this is only for educational purposes
docker-compose.yml:
version: '3'
services:
ubuntu-vm:
build: .
image: ubuntu-ssh
ports:
- "2222:22"
environment:
- ROOT_PASSWORD=password
restart: always
networks:
mynetwork:
ipv4_address: 172.24.0.2
networks:
mynetwork:
driver: bridge
ipam:
config:
- subnet: 172.24.0.0/16
Dockerfile:
FROM ubuntu:latest
RUN apt-get update && \
apt-get install -y openssh-server && \
mkdir /var/run/sshd
RUN echo 'root:password' | chpasswd
RUN sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config
EXPOSE 22
CMD [ "/usr/sbin/sshd", "-D", "-e" ]
I have tried adding storage_opt: size: 100G to the compose file, but upon doing df -H in the container, it returned the host disk available size and disk usage (in this example 400gb used, 1.9tb available)
Will I have to create a disk in my host and map it my container's /dev/sdx disk? Or is there a better way to do it where the container does have access to the host disk as full but a chunk of it.
答案1
得分: 1
我已经尝试将 storage_opt: size: 100G 添加到compose文件中，但在容器中运行 df -H 时，返回的是主机磁盘的可用空间和磁盘使用情况（在这个示例中，已使用 400GB，可用 1.9TB）。
当然，因为 df -h 将显示 设备 的大小，而不是特定文件系统上的可用配额限制。创建一个大于 100G 的文件来检查。
$ docker run -ti --rm --storage-opt size=5G alpine
# dd if=/dev/random of=file bs=10M count=1023
dd: error writing 'file': Quota exceeded
512+0 records in
511+0 records out
这很可能是Docker存储驱动程序特定的问题 - 我在btrfs上进行了测试。
英文:
> I have tried adding storage_opt: size: 100G to the compose file, but upon doing df -H in the container, it returned the host disk available size and disk usage (in this example 400gb used, 1.9tb available)
Sure, because df -h will show the size of the device, not available quota limits on specific filesystem. Create a file bigger than 100G to check.
$ docker run -ti --rm --storage-opt size=5G alpine
# dd if=/dev/random of=file bs=10M count=1023
dd: error writing 'file': Quota exceeded
512+0 records in
511+0 records out
This is most probably docker storage driver specific - I tested on btrfs.
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